CN115265863B - Pressure sensor and pressure sensor detection system - Google Patents
Pressure sensor and pressure sensor detection system Download PDFInfo
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- CN115265863B CN115265863B CN202210643627.3A CN202210643627A CN115265863B CN 115265863 B CN115265863 B CN 115265863B CN 202210643627 A CN202210643627 A CN 202210643627A CN 115265863 B CN115265863 B CN 115265863B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/24—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet
- G01L1/242—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet the material being an optical fibre
- G01L1/246—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet the material being an optical fibre using integrated gratings, e.g. Bragg gratings
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L25/00—Testing or calibrating of apparatus for measuring force, torque, work, mechanical power, or mechanical efficiency
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- Measuring Fluid Pressure (AREA)
Abstract
本公开提供了一种压力传感器及压力传感器的检测系统，属于压力测量技术领域。所述压力传感器包括受压组件、光纤光栅组件和外壳，所述受压组件包括压盘、传力杆和减震装置，所述传力杆的第一端与所述压盘的一侧连接，所述减震装置与所述传力杆的中部连接；所述光纤光栅组件包括第一光纤光栅、感应球和第一光纤，所述第一光纤光栅与所述第一光纤串接在一起，所述第一光纤与所述感应球的外壁相贴合，所述压盘位于所述外壳之外，所述传力杆和所述减震装置均位于所述外壳内；所述光纤光栅组件位于所述外壳内。本公开通过压力传感器可以提高压力传感器的检测精度。
The present disclosure provides a pressure sensor and a detection system for the pressure sensor, which belongs to the field of pressure measurement technology. The pressure sensor includes a pressure component, a fiber grating component and a shell, the pressure component includes a pressure plate, a force transmission rod and a shock absorbing device, the first end of the force transmission rod is connected to one side of the pressure plate, and the shock absorbing device is connected to the middle of the force transmission rod; the fiber grating component includes a first fiber grating, a sensing ball and a first optical fiber, the first fiber grating is connected in series with the first optical fiber, the first optical fiber is in contact with the outer wall of the sensing ball, the pressure plate is located outside the shell, the force transmission rod and the shock absorbing device are both located inside the shell; the fiber grating component is located inside the shell. The present disclosure can improve the detection accuracy of the pressure sensor through the pressure sensor.
Description
Technical Field
The disclosure belongs to the technical field of pressure measurement, and in particular relates to a pressure sensor and a detection system of the pressure sensor.
Background
Pressure sensors, one of the most important types of sensors, are widely used in various industrial automation environments. Such as water conservancy and hydropower, rail traffic, intelligent construction, production automation, aerospace, military, petrochemical, oil well, electric power, ship, machine tool, pipeline, etc.
In the related art, the pressure sensor is typically an electromagnetic pressure sensor. Electromagnetic pressure sensors typically include a force-bearing element (e.g., which may be a metal or a semiconductor material). That is, an electromagnetic pressure sensor is a sensor that indirectly measures pressure by measuring strain of a force receiving element. When the stress element is subjected to pressure, the length and the sectional area of the stress element are changed, and correspondingly, the resistance value is changed, so that the strain of the stress element can be obtained by obtaining the change value of the resistance value and further back-pushing, and finally the pressure to be measured is obtained.
However, since the electromagnetic pressure sensor needs to use an electromagnetic signal when in use, the electromagnetic pressure sensor is easily interfered by the electromagnetic signal, the detection precision is reduced, and the wiring mode is complex, so that the electromagnetic pressure sensor is inconvenient to use.
Disclosure of Invention
The embodiment of the disclosure provides a pressure sensor and a detection system of the pressure sensor, which can improve the detection precision of the pressure sensor. The technical scheme is as follows:
The embodiment of the disclosure provides a pressure sensor, which comprises a pressure receiving component, a fiber grating component and a shell, wherein the pressure receiving component comprises a pressure plate, a dowel bar and a damping device, a first end of the dowel bar is connected with one side of the pressure plate, the damping device is connected with the middle of the dowel bar, the fiber grating component comprises a first fiber grating, an induction ball and a first fiber, the first fiber grating is connected with the first fiber in series, the first fiber is attached to the outer wall of the induction ball, the length direction of the first fiber is perpendicular to the axis direction of the dowel bar, a first side of the induction ball is connected with a second end of the dowel bar, a second side of the induction ball is respectively located on two sides of the central point of the induction ball along the axis direction of the dowel bar, the first fiber is located between the central point of the induction ball and the second side, the first fiber grating is located outside the shell, the dowel bar and the pressure plate are located in the shell, and the fiber grating component is located in the shell.
In another implementation manner of the disclosure, the fiber grating assembly further includes a second fiber grating and a second optical fiber, the second fiber grating is connected with the second optical fiber in series, the second optical fiber is attached to the outer wall of the sensing ball, the first optical fiber and the second optical fiber are parallel to each other, and in the axial direction of the dowel bar, the first optical fiber and the second optical fiber are located at two sides of the center point of the sensing ball respectively.
In another implementation of the present disclosure, the sensing ball is an elliptical ball, and a long axis direction of the sensing ball is the same as an axis direction of the dowel.
In another implementation of the disclosure, the damping device includes a first connecting piece, a second connecting piece and an elastic telescopic rod, the first connecting piece is connected with the middle part of the dowel, the second connecting piece is connected with the middle part of the dowel in a sliding manner, the second connecting piece is connected with the inner wall of the shell, the first connecting piece and the second connecting piece are arranged at intervals, the elastic telescopic rod is located between the first connecting piece and the second connecting piece, and two ends of the elastic telescopic rod are hinged with the first connecting piece and the second connecting piece respectively.
In another implementation manner of the present disclosure, the number of the elastic telescopic rods is two, the two elastic telescopic rods are symmetrically arranged with the axis of the dowel bar as a symmetrical axis, an included angle is formed between the elastic telescopic rods and the dowel bar, the distance between the first ends of the elastic telescopic rods and the dowel bar is smaller than the distance between the second ends of the elastic telescopic rods and the dowel bar, the first ends of the elastic telescopic rods face towards one end of the first connecting piece, the second ends of the elastic telescopic rods face towards one end of the second connecting piece, and the first connecting piece is located between the second connecting piece and the pressure plate.
In another implementation manner of the present disclosure, the elastic telescopic rod includes a telescopic tube, an elastic telescopic member and a connecting rod, the elastic telescopic member is movably located in the telescopic tube along an axis of the telescopic tube, a first end of the elastic telescopic member is connected with an inner wall of the telescopic tube, a second end of the elastic telescopic member is connected with a first end of the connecting rod, the telescopic tube is hinged with the second connecting member, and a second end of the connecting rod is connected with the first connecting member.
In another implementation manner of the disclosure, the fiber bragg grating assembly further includes at least one pair of fixing supports, the at least one pair of fixing supports are respectively located at two opposite sides of the sensing ball along the axis direction perpendicular to the dowel bar, and the first optical fiber is respectively and fixedly connected with the at least one pair of fixing supports.
In another implementation mode of the present disclosure, the fixing support includes a jacket and a core tube, the core tube is located in the jacket, two ends of the core tube are respectively connected with the jacket, and the core tube is sleeved outside the first optical fiber.
In another implementation of the present disclosure, the induction ball is a soft rubber structure.
In another implementation manner of the disclosure, a detection system of a pressure sensor is further provided, the detection system comprises the pressure sensor and a demodulator, the pressure sensor is the pressure sensor, and the demodulator is connected with two ends of the first optical fiber.
The technical scheme provided by the embodiment of the disclosure has the beneficial effects that:
When the pressure sensor provided by the embodiment of the disclosure detects the pressure sensed by the measured object, the pressure sensor comprises the pressure receiving component and the fiber bragg grating component, wherein the pressure receiving component comprises the pressure plate, the dowel bar and the damping device, so that the pressure sensor can be connected with the measured object through the pressure plate to transmit the pressure received by the pressure plate. Meanwhile, the pressure born by the pressure plate is transmitted to the sensing ball through the dowel bar, and the acting force born by the dowel bar is relieved through buffering of the damping device, so that the pressure born by the sensing ball is reduced.
Because the first optical fiber offsets with the outer wall of the sensing ball, and the first optical fiber is located between the central point and the second side of the sensing ball, when the sensing ball is subjected to pressure downward movement, the first optical fiber can be subjected to pressure of the sensing ball, and the first optical fiber grating connected with the first optical fiber is subjected to axial pressure to deform, so that the original central wavelength of the first optical fiber grating is changed, the effect of detecting the pressure can be achieved according to the wavelength drift amount of the first optical fiber grating, the influence of environment and the like on the detection process is eliminated, the detection precision is greatly improved, and the detection process is simplified.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings required for the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present disclosure, and other drawings may be obtained according to these drawings without inventive effort for a person of ordinary skill in the art.
Fig. 1 is a schematic structural diagram of a pressure sensor provided in an embodiment of the present disclosure.
The symbols in the drawings are as follows:
1. The device comprises a compression assembly, 11, a pressure plate, 12, a dowel bar, 13, a damping device, 131, a first connecting piece, 132, a second connecting piece, 133, an elastic telescopic rod, 1331, a telescopic cylinder, 1332, an elastic telescopic piece, 1333 and a connecting rod;
2. The optical fiber grating comprises an optical fiber grating assembly, a first optical fiber grating, a 22, a sensing ball, a 23, a first optical fiber, a 24, a second optical fiber grating, a 25, a second optical fiber, a 26, a fixed support, a 261, an outer sleeve, a 262 and a core tube;
3. A housing.
Detailed Description
For the purposes of clarity, technical solutions and advantages of the present disclosure, the following further details the embodiments of the present disclosure with reference to the accompanying drawings.
In order to clearly explain the pressure sensor provided by the embodiment of the present disclosure, a brief description will be given of a detection principle of the fiber grating sensor.
The fiber grating sensor is a fiber sensing technology based on the information of the wavelength of reflected light, and the sensing unit is a fiber grating. The physical quantity tested by the fiber bragg grating sensor depends on a demodulator of the fiber bragg grating and further depends on the fiber bragg grating.
During detection, the fiber bragg grating is connected with a demodulator through an optical fiber. When broadband light emitted by the demodulator passes through the fiber bragg grating, the fiber bragg grating reflects the narrowband light with a certain central wavelength (the wavelength of the narrowband light depends on the grating pitch of the fiber bragg grating, and the mathematical expression is that lambda=2nΛ, wherein lambda is the central wavelength of the reflected narrowband light of the fiber bragg grating; when the strain sensed by the fiber grating changes, the grating pitch changes, i.e., the center wavelength of the reflected narrowband light (i.e., the reflected center wavelength) shifts (i.e., wavelength shifts) relative to the original center wavelength (i.e., the center wavelength of the reflected narrowband light when the fiber Bragg grating is not subject to strain), and the measured strain value can be obtained by demodulating the reflected narrowband light.
The demodulator is internally integrated with a light source, an optical fiber coupler, an optical detection module, a signal demodulation module, a data processing module and the like. The demodulator may be directly connected to the computer. Thus, the wavelength drift amount of the fiber bragg grating is read on a computer, and the measured strain value can be obtained.
The disclosed embodiment provides a pressure sensor, as shown in fig. 1, which comprises a pressure receiving component 1, a fiber grating component 2 and a shell 3. The compression assembly 1 comprises a pressure plate 11, a dowel bar 12 and a damping device 13, wherein a first end of the dowel bar 12 is connected with one side of the pressure plate 11, and the damping device 13 is connected with the middle part of the dowel bar 12.
The fiber bragg grating assembly 2 comprises a first fiber bragg grating 21, an induction ball 22 and a first optical fiber 23, wherein the first fiber bragg grating 21 and the first optical fiber 23 are connected in series, the first optical fiber 23 is attached to the outer wall of the induction ball 22, the length direction of the first optical fiber 23 is perpendicular to the axis direction of the dowel bar 12, the first side of the induction ball 22 is connected with the second end of the dowel bar 12, the second side of the induction ball 22 and the first side of the induction ball 22 are respectively located on two sides of the center point of the induction ball 22 along the axis direction of the dowel bar 12, and the first optical fiber 23 is located between the center point and the second side of the induction ball 22.
The pressure plate 11 is located outside the housing 3, and the dowel bar 12 and the damper 13 are both located inside the housing 3. The fiber grating assembly 2 is located within the housing 3.
When the pressure sensor provided by the embodiment of the disclosure detects the pressure sensed by the measured object, the pressure sensor comprises the pressure receiving component 1 and the fiber bragg grating component 2, and the pressure receiving component 1 comprises the pressure plate 11, the dowel bar 12 and the damping device 13, so that the pressure sensor can be connected with the measured object through the pressure plate 11 to transmit the pressure received by the pressure plate 11. Meanwhile, the pressure born by the pressure plate 11 is generally transmitted to the sensing ball 22 by the dowel bar 12, and is buffered by the damping device 13 to slow down the acting force born by the dowel bar 12, so that the pressure born by the sensing ball 22 is finally reduced.
Because the first fiber bragg grating 21 is propped against the outer wall of the sensing ball 22, and the first optical fiber 23 is positioned between the center point and the second side of the sensing ball 22, when the sensing ball 22 is subjected to pressure downward movement, the first fiber bragg grating 23 is subjected to pressure of the sensing ball 22, so that the first fiber bragg grating 21 connected with the first fiber bragg grating 23 is subjected to axial pressure to deform, and the original center wavelength of the first fiber bragg grating 21 is changed, thereby achieving the effect of detecting the pressure according to the drift amount of the wavelength of the first fiber bragg grating 21, eliminating the influence of electromagnetic signals and the like in the environment on the detection process, greatly improving the detection precision and simplifying the detection process.
In addition, the casing 3 is used as a sealing protection structure of the pressure sensor, so that not only can the influence of external environment be isolated, but also the components inside the casing 3 can be protected, and the service life of the pressure sensor can be prolonged.
Illustratively, the fiber bragg grating assembly 2 further includes a second fiber bragg grating 24 and a second optical fiber 25, the second fiber bragg grating 24 is connected in series with the second optical fiber 25, the second optical fiber 25 is attached to the outer wall of the sensing ball 22, the first optical fiber 23 and the second optical fiber 25 are parallel to each other, and the first optical fiber 23 and the second optical fiber 25 are respectively located at two sides of the center point of the sensing ball 22 in the axial direction of the dowel 12.
In the above implementation manner, the first fiber grating 21 and the second fiber grating 24 are arranged, one of which can be used as a main element for pressure detection, and the other one is used as temperature compensation, so that when pressure is detected, the influence of ambient temperature on the detection process can be eliminated, and the detection precision is greatly improved.
For example, when sensing ball 22 is moved downward by the pressure of dowel 12, because second optical fiber 25 is located above the center point of sensing ball 22 (above as shown in FIG. 1, i.e., between the center point and the first side of sensing ball 22). The first optical fiber 23 is located below the center point of the sensing ball 22 (below as shown in fig. 1, i.e., between the center point and the second side of the sensing ball 22), so that the sensing ball 22 slides downward relative to the second optical fiber 25 during the downward movement, such that the second optical fiber 25 is brought into contact with the larger outer diameter of the sensing ball 22 and becomes spaced from the smaller outer diameter of the sensing ball 22. The first optical fiber 23 is opposite, and the first optical fiber 23 is attached to the smaller outer diameter of the sensing ball 22 and is made to abut against the larger outer diameter of the sensing ball 22. In this way, the second optical fiber 25 is not subjected to the pressure of the sensing ball 22, and therefore, the second optical fiber grating 24 connected to the second optical fiber 25 is not subjected to the axial strain, and the center wavelength is not shifted. The first optical fiber 23 receives the pressure of the sensing ball 22, so that the first fiber grating 21 connected to the first optical fiber 23 receives an axial strain to shift the center wavelength.
In addition, since the first fiber grating 21 and the second fiber grating 24 are located in the same environment, the detection results of the first fiber grating 21 and the second fiber grating 24 each include a detection result in which the original center wavelength is changed due to a change in the temperature of the environment. Thus, the influence of temperature can be eliminated by making a difference between the detection results of the first fiber grating 21 and the second fiber grating 24. Namely, the wavelength drift amounts of the first fiber bragg grating 21 and the second fiber bragg grating 24 are subjected to difference value by a self-differential compensation method, so that the effect of self-compensation of the sensor temperature is achieved.
In actual use, the first fiber bragg grating 21 and the second fiber bragg grating 24 may be connected in series with each other through the first fiber 23 and the second fiber bragg grating 25 and connected to the same demodulator, so that the structure can be simplified. Of course, the first fiber grating 21 and the second fiber grating 24 may be connected to one demodulator.
The reflection center wavelengths of the first fiber grating 21 and the second fiber grating 24 are different, and the initial center wavelengths of the first fiber grating 21 and the second fiber grating 24 are the same.
In the above implementation manner, since the initial center wavelength of the first fiber grating 21 and the initial center wavelength of the second fiber grating 24 are the same, the wavelength drift amounts of the first fiber grating 21 and the second fiber grating 24 are the same due to the temperature effect when the first fiber grating 21 and the second fiber grating 24 are detected. The reflection center wavelength of the first fiber grating 21 and the reflection center wavelength of the second fiber grating 24 are set to be different, so that when the first fiber grating 21 and the second fiber grating 24 are connected in series with the same demodulator, the demodulator can distinguish the emission signals of different fiber gratings according to different reflection center wavelengths.
Alternatively, the sensing ball 22 is an elliptical ball, and the long axis direction of the sensing ball 22 is the same as the axis direction of the dowel 12.
In the above implementation manner, the sensing ball 22 is an elliptical ball, and the long axis direction of the sensing ball 22 is the same as the axis direction of the dowel bar 12, so that the arrangement of the elliptical ball can increase the movable stroke of the sensing ball 22 on the premise that the outer diameter variation of the sensing ball 22 is the same as that of the circular ball, and further the detection range of the pressure sensor is improved.
Alternatively, the sensing ball 22 is a soft rubber structure.
The sensing ball 22 is arranged as a soft rubber structural member, so that the weight of the pressure sensor can be reduced, and the pressure acting on the first optical fiber 23 or the second optical fiber 25 can be relieved, so that the phenomenon of fracture caused by overlarge pressure applied to the first optical fiber 23 or the second optical fiber 25 is avoided.
Optionally, the fiber grating assembly 2 further includes at least one pair of fixing supports 26, along a direction perpendicular to the axis of the dowel bar 12, the at least one pair of fixing supports 26 are respectively located on opposite sides of the sensing ball 22, and the first optical fiber 23 is fixedly connected to the at least one pair of fixing supports 26.
In the above-described implementation, the fixing support 26 is used to fix both ends of the first optical fiber 23, so that the first optical fiber 23 can be well attached to the outer wall of the sensing ball 22 after the first optical fiber grating 21 is connected.
Illustratively, the fixed support 26 may be two pairs. A pair of fixing holders 26 are correspondingly connected to the first optical fibers 23. The other pair is connected to a second optical fiber 25. Each pair of the fixing supports 26 are respectively located at two sides of the sensing ball 22 along the long axis direction.
This effectively attaches the first optical fiber 23 and the second optical fiber 25 to the outer wall of the sensing ball 22.
Alternatively, the fixed support 26 includes a housing 261 and a core tube 262, the core tube 262 is positioned in the housing 261, and both ends of the core tube 262 are respectively connected with the housing 261. The core tube 262 is sleeved outside the first optical fiber 23 or the second optical fiber 25.
In the above implementation, the core tube 262 is used to connect with the first optical fiber 23 or the second optical fiber 25, and the jacket 261 is used to protect the core tube 262.
The core tube 262 is illustratively attached to the outer wall of the first optical fiber 23 or the second optical fiber 25 by means of a paste. This facilitates the connection and fixation of the first optical fiber 23 or the second optical fiber 25.
Illustratively, the core tube 262 may be a fiberglass tube. At this time, the first optical fiber 23 or the second optical fiber 25 may be attached by an epoxy resin adhesive.
The outer jacket 261 may be a metallic structural member. This can increase the structural strength of the fixed support 26 and thus effectively protect the core tube 262 to extend the service life of the fixed support 26.
With continued reference to fig. 1, the shock absorbing device 13 optionally includes a first connector 131, a second connector 132, and an elastically telescoping rod 133.
The first connecting piece 131 is connected with the middle part of the dowel 12, the second connecting piece 132 is connected with the middle part of the dowel 12 in a sliding manner, the first connecting piece 131 and the second connecting piece 132 are arranged at intervals, the elastic telescopic rod 133 is located between the first connecting piece 131 and the second connecting piece 132, and two ends of the elastic telescopic rod 133 are hinged with the first connecting piece 131 and the second connecting piece 132 respectively. The elastic telescopic rod 133 is used to expand and contract along its own axis.
In the above implementation, the first connecting piece 131 is used to connect with the dowel 12 to share the pressure applied by the dowel 12. The elastic telescopic rod 133 is used for connecting the first connecting piece 131 and the second connecting piece 132, so as to absorb the pressure applied by the first connecting piece 131 through the telescopic change of the elastic telescopic rod, and further reduce the acting force applied by the dowel 12 to the sensing ball 22, so that the moving range of the sensing ball 22 is reduced.
In the present embodiment, the hinge shaft between the elastic telescopic link 133 and the hinge of the first and second links 131 and 132 is arranged perpendicular to the elastic telescopic link 133. In this way, the connection angle between the elastic telescopic rod 133 and the first connecting piece 131 and the second connecting piece 132 can be flexibly adjusted in a hinged manner, so that the elastic telescopic rod 133 can be well connected with the first connecting piece 131 and the second connecting piece 132 all the time in the telescopic movement process.
Alternatively, the two elastic telescopic rods 133 may be symmetrically arranged with the axis of the dowel 12 as a symmetry axis, the elastic telescopic rods 133 and the dowel 12 form an included angle, the distance between the first end of the elastic telescopic rods 133 and the dowel 12 is smaller than the distance between the second end of the elastic telescopic rods 133 and the dowel 12, the first end of the elastic telescopic rods 133 faces one end of the first connecting piece 131, the second end of the elastic telescopic rods 133 faces one end of the second connecting piece 132, and the first connecting piece 131 is located between the second connecting piece 132 and the pressure plate 11.
In the above-described implementation manner, the arrangement of the two elastic telescopic rods 133 can further increase the pressure applied to the absorbing first connecting member 131 and the second connecting member 132, thereby increasing the buffering effect of the shock absorbing device 13.
In addition, the elastic telescopic rod 133 and the dowel bar 12 form an included angle, so that the transverse acting force borne by the pressure plate 11 can be counteracted in a manner of offsetting and hinging the elastic telescopic rod 133 relative to the dowel bar 12, so that the pressure sensor is ensured not to deviate, the pressure plate 11 is only subjected to vertical acting force, and the detection precision of the pressure sensor is finally improved.
Of course, other numbers of elastic telescopic rods 133 are also possible, such as four, and four elastic telescopic rods 133 are symmetrically located on both sides of the axis of the dowel 12. In fact, as long as the arrangement of the elastic telescopic rods 133 is capable of slowing down the pressure to which the dowel rods 12 are subjected, and ensuring that the dowel rods 12 can be kept balanced when subjected to the pressure, the number of the elastic telescopic rods 133 can be freely selected.
Optionally, the elastic telescopic rod 133 includes a telescopic tube 1331, an elastic telescopic member 1332 and a connecting rod 1333, the elastic telescopic member 1332 is movably located in the telescopic tube 1331 along the axis of the telescopic tube 1331, and a first end of the elastic telescopic member 1332 is connected with the inner wall of the telescopic tube 1331, and a second end of the elastic telescopic member 1332 is connected with the first end of the connecting rod 1333.
The telescopic cylinder 1331 is hinged with the second connecting piece 132, and the second end of the connecting rod 1333 is connected with the first connecting piece 131.
In the above implementation manner, the elastic telescopic rod 133 is set to be the telescopic tube 1331, the elastic telescopic piece 1332 and the connecting rod 1333, so that the elastic telescopic rod 133 can be connected with the first connecting piece 131 through the connecting rod 1333, the telescopic tube 1331 and the connecting rod 1333 are connected through the telescopic tube 1331 and the connecting rod 1333, the connecting rod 1333 can move relative to the telescopic tube 1331, and meanwhile energy absorption is carried out through the elastic telescopic piece 1332, so that pressure between the first connecting piece 131 and the second connecting piece 132 is effectively buffered.
Illustratively, the resilient telescoping member 1332 is a telescoping spring. Thus, the requirements of the above use can be conveniently met.
The first connector 131 is a rod-shaped structure, and the second connector 132 is a plate-shaped structure. The first connection member 131 is disposed in parallel with the plane in which the second connection member 132 is disposed. This facilitates the connection of the first and second connection members 131, 132 to the transfer lever 12, respectively.
The first connecting member 131 and the dowel 12 may be an integral structure, or may be directly welded. This can improve the strength of the connection between the first connecting member 131 and the dowel 12 and the efficiency of manufacture.
The housing 3 is illustratively an aluminum structural member. This not only reduces the cost of the housing 3, but also facilitates purchase.
The embodiment of the disclosure also provides a detection system of the pressure sensor, which comprises the pressure sensor and at least one demodulator. The pressure sensor is the above-mentioned pressure sensor, at least one demodulator is located outside the housing 3, and the at least one demodulator is connected to both ends of the first optical fiber 23, respectively.
The above detection system has the same advantageous effects as the pressure sensor and will not be described here again.
In addition, when the first fiber grating 21 and the second fiber grating 24 are included in the pressure sensor. And when the first optical fiber 23 and the second optical fiber 25 are connected in series with a demodulator. Thus, when the demodulator emits a broadband light to pass through the first fiber grating 21 and the second fiber grating 24, the first fiber grating 21 reflects the narrowband light with a certain central wavelength. At the same time, the second fiber grating 24 also reflects narrowband light that would otherwise have a center wavelength. The demodulator obtains different reflected center wavelengths according to different deformations of the first fiber grating 21 and the second fiber grating 24, so that the measured strain value can be obtained according to the reflected center wavelengths of the first fiber grating 21 and the second fiber grating 24.
When the first fiber bragg grating 21 and the second fiber bragg grating 24 in the pressure sensor are not connected in series with one demodulator, that is, the first fiber 23 and the second fiber bragg grating 25 are not connected in series, two demodulators are provided. One of the demodulators is connected to the first optical fiber 23 and the other demodulator is connected to the second optical fiber 25, so that the two demodulators obtain the measured strain value according to the information of the reflected center wavelength of the corresponding fiber grating. In this case, the reflection center wavelength of the first fiber grating 21 and the reflection center wavelength of the second fiber grating 24 may be the same or different.
The following briefly describes the detection process of the pressure sensor provided by the implementation of the present disclosure:
first, a platen of a pressure sensor is connected to an object to be measured.
During detection, the pressure sensor can be placed in a detection environment according to actual conditions, such as the pressure applied to the bridge pier of the bridge, and the chassis of the pressure sensor can be placed below the bridge pier.
Then, the wavelength drift amount of the fiber bragg grating in the pressure sensor is obtained.
In this embodiment, when there is only the first fiber grating, the wavelength shift amount of the fiber grating refers to the wavelength shift amount of the corresponding fiber grating.
When the first fiber grating and the second fiber grating are included, the wavelength shift amount of the fiber grating refers to the difference between the wavelength shift amounts of the first fiber grating and the second fiber grating.
Of course, when the first fiber grating and the second fiber grating are included, the first fiber grating and the second fiber grating of the pressure sensor are connected with the same demodulator for the convenience of the connection of the pressure sensor with the demodulator.
During detection, the first fiber bragg grating and the second fiber bragg grating are connected with the demodulator through the same fiber. The reflection center wavelength of the first fiber grating is different from the reflection center wavelength of the second fiber grating. The initial center wavelength of the first fiber grating is the same as the initial center wavelength of the second fiber grating. Broadband light emitted by the demodulator sequentially passes through the first fiber grating and the second fiber grating. When the broadband light passes through the first fiber bragg grating, the first fiber bragg grating reflects a part of the broadband light to obtain a narrowband light with a certain central wavelength, and the narrowband light is transmitted back to the demodulator for recording. And after the other part of the broadband light emitted from the demodulator continues to propagate forward to the second fiber grating, the second fiber grating reflects the part of the broadband light to obtain the narrowband light with the other center wavelength, and the narrowband light is also retransmitted back to the demodulator for recording.
Because the reflection center wavelength of the first fiber grating is different from the reflection center wavelength of the second fiber grating. Thus, the detection signals of different fiber gratings can be automatically identified through a demodulator.
Then, the magnitude of the detected pressure is determined based on the wavelength shift amount.
The relation between the wavelength drift amount delta lambda of the fiber grating and the axial strain delta epsilon and the environmental temperature change delta T of the fiber grating is as follows:
Wherein α f is the coefficient of thermal expansion with the first and second optical fibers, ζ is the coefficient of thermal light with the first and second optical fiber gratings, and P e is the effective spring light coefficient of the first and second optical fibers (P e is equal to about 0.22 at room temperature).
Therefore, when the sensing ball moves downwards once receiving pressure, the wavelength of the fiber grating is changed, and finally the detected pressure can be obtained by measuring the wavelength drift amount of the fiber grating.
The foregoing description of the preferred embodiments of the present disclosure is provided for the purpose of illustration only, and is not intended to limit the disclosure to the particular embodiments disclosed, but on the contrary, the intention is to cover all modifications, equivalents, alternatives, and alternatives falling within the spirit and principles of the disclosure.
Claims (9)
1. A pressure sensor is characterized by comprising a compression component (1), a fiber bragg grating component (2) and a shell (3),
The pressure receiving assembly (1) comprises a pressure plate (11), a dowel bar (12) and a damping device (13), wherein a first end of the dowel bar (12) is connected with one side of the pressure plate (11), and the damping device (13) is connected with the middle part of the dowel bar (12);
The optical fiber grating assembly (2) comprises a first optical fiber grating (21), an induction ball (22) and a first optical fiber (23), wherein the first optical fiber grating (21) is connected with the first optical fiber (23) in series, the first optical fiber (23) is attached to the outer wall of the induction ball (22), the length direction of the first optical fiber (23) is perpendicular to the axis direction of the dowel (12), the first side of the induction ball (22) is connected with the second end of the dowel (12), the second side of the induction ball (22) and the first side of the induction ball (22) are respectively positioned at two sides of the center point of the induction ball (22) along the axis direction of the dowel (12), the induction ball (22) is an elliptical ball, and the long axis direction of the induction ball (22) is the same as the axis direction of the dowel (12), and the first optical fiber (23) is positioned between the center point and the second side of the induction ball (22);
The pressure plate (11) is positioned outside the shell (3), and the dowel bar (12) and the damping device (13) are both positioned in the shell (3);
The fiber bragg grating component (2) is positioned in the shell (3).
2. The pressure sensor according to claim 1, wherein the fiber grating assembly (2) further comprises a second fiber grating (24) and a second optical fiber (25), the second fiber grating (24) is connected in series with the second optical fiber (25), the second optical fiber (25) is attached to the outer wall of the sensing ball (22),
The first optical fiber (23) and the second optical fiber (25) are parallel to each other, and the first optical fiber (23) and the second optical fiber (25) are respectively positioned at two sides of the center point of the sensing ball (22) in the axial direction of the dowel bar (12).
3. The pressure sensor according to claim 1, characterized in that the damping means (13) comprise a first connection (131), a second connection (132) and an elastic telescopic rod (133),
The utility model discloses a dowel steel, including dowel steel, dowel steel (12), shell, first connecting piece (131) with the middle part of dowel steel (12) is connected, second connecting piece (132) with the middle part sliding connection of dowel steel (12), just second connecting piece (132) with the inner wall connection of shell (3), just first connecting piece (131) with second connecting piece (132) mutual interval arrangement, elasticity telescopic link (133) are located between first connecting piece (131) and second connecting piece (132), the both ends of elasticity telescopic link (133) respectively with first connecting piece (131) with second connecting piece (132) are articulated.
4. A pressure sensor according to claim 3, wherein the number of the elastic telescopic rods (133) is two, the two elastic telescopic rods (133) are symmetrically arranged with the axis of the dowel (12) as a symmetrical axis, an included angle is formed between the elastic telescopic rods (133) and the dowel (12), the distance between the first ends of the elastic telescopic rods (133) and the dowel (12) is smaller than the distance between the second ends of the elastic telescopic rods (133) and the dowel (12), the first ends of the elastic telescopic rods (133) face one end of the first connecting piece (131), the second ends of the elastic telescopic rods (133) face one end of the second connecting piece (132), and the first connecting piece (131) is located between the second connecting piece (132) and the pressure plate (11).
5. A pressure sensor according to claim 3, wherein the elastic telescopic rod (133) comprises a telescopic cylinder (1331), an elastic telescopic piece (1332) and a connecting rod (1333),
The elastic telescopic piece (1332) is movably arranged in the telescopic cylinder (1331) along the axis of the telescopic cylinder (1331), the first end of the elastic telescopic piece (1332) is connected with the inner wall of the telescopic cylinder (1331), and the second end of the elastic telescopic piece (1332) is connected with the first end of the connecting rod (1333);
the telescopic cylinder (1331) is hinged with the second connecting piece (132), and the second end of the connecting rod (1333) is connected with the first connecting piece (131).
6. Pressure sensor according to any one of claims 1 to 5, characterized in that the fiber grating assembly (2) further comprises at least one pair of fixing supports (26), said at least one pair of fixing supports (26) being located on opposite sides of the sensing sphere (22) along a direction perpendicular to the axis of the dowel bar (12), respectively, and the first optical fiber (23) being fixedly connected to said at least one pair of fixing supports (26), respectively.
7. The pressure sensor of claim 6, wherein the stationary support (26) comprises a housing (261) and a core tube (262), the core tube (262) being located within the housing (261) and both ends of the core tube (262) being connected with the housing (261), respectively;
The core tube (262) is sleeved outside the first optical fiber (23).
8. Pressure sensor according to any of claims 1 to 5, characterized in that the sense ball (22) is a soft rubber structure.
9. A detection system of a pressure sensor, characterized in that the detection system comprises a pressure sensor and a demodulator;
The pressure sensor is a pressure sensor according to any one of claims 1 to 8, and the demodulator is connected to both ends of the first optical fiber.
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| CN208458900U (en) * | 2018-07-24 | 2019-02-01 | 中国航空工业集团公司西安飞行自动控制研究所 | A fiber grating pressure sensor structure |
| CN216284037U (en) * | 2021-12-09 | 2022-04-12 | 石家庄铁道大学 | Self-resetting sensitization type pressure monitoring device based on fiber bragg grating |
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| CA2353567C (en) * | 1998-12-04 | 2007-11-20 | Cidra Corporation | Bragg grating pressure sensor |
| TWI346772B (en) * | 2007-06-22 | 2011-08-11 | Univ Nat Chiao Tung | Fiber grating sensor |
| CN101782443B (en) * | 2010-01-19 | 2012-03-21 | 山东科技大学 | Full-mechanized hydraulic support fiber bragg grating pressure sensor |
| CN105841858B (en) * | 2016-03-21 | 2017-06-09 | 中国科学院武汉岩土力学研究所 | A kind of fiber Bragg grating type pressure sensor for the complete stress measurement of ground |
| CN106969823B (en) * | 2017-03-10 | 2019-07-12 | 武汉理工大学 | A kind of tangential fiber grating torsional oscillation sensor |
| CN107907252A (en) * | 2017-10-23 | 2018-04-13 | 沈阳建筑大学 | A kind of lever fiber bragg grating pressure sensor |
| CN113551819A (en) * | 2021-08-24 | 2021-10-26 | 南京邮电大学 | High-temperature-resistant fiber Bragg grating pressure sensor |
| CN114396999A (en) * | 2021-12-09 | 2022-04-26 | 武汉工程大学 | Pressure sensor, pressure monitoring assembly and weighing device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN208458900U (en) * | 2018-07-24 | 2019-02-01 | 中国航空工业集团公司西安飞行自动控制研究所 | A fiber grating pressure sensor structure |
| CN216284037U (en) * | 2021-12-09 | 2022-04-12 | 石家庄铁道大学 | Self-resetting sensitization type pressure monitoring device based on fiber bragg grating |
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