CN106932927A - Adjustable spectrum resynthesis device - Google Patents

Abstract

The invention provides an adjustable spectrum resynthesis device, which comprises: the wedge-shaped optical filter is provided with a plurality of optical filtering sections which are respectively used for filtering incident light so as to simultaneously generate a plurality of light rays with different frequency bands; a liquid crystal module including a plurality of gating sections for gating light generated by the wedge filter, respectively; a drive circuit; a control circuit configured to control the driving circuit to selectively set one or more selected gating sections of the plurality of gating sections to a light-permeable state and simultaneously set other gating sections to a non-light-permeable state, so that only part of the frequency band of light can pass through the liquid crystal module during the same time; and a light path adjusting device configured to adjust a traveling path of the light passing through the liquid crystal module to synthesize output light having a spectral component different from that of the incident light. The time required for the driving electricity to change the rotation angle of the liquid crystal molecules is short, so that the control circuit can rapidly change the spectral components of the output light of the light path adjusting device.

Description

Tunable spectral resynthesis device

technical field

The invention relates to a spectroscopic device, in particular to an adjustable spectral resynthesis device using a wedge-shaped filter.

Background technique

Light of different spectrums is required to detect different objects, but general spectroscopic devices can only provide output light of a single specific frequency band, so the scope of application is very limited.

In some traditional structures, multiple filters of different frequency bands are set on a mechanical switching device such as a rotary wheel, and by rotating the switching device, the appropriate specific filter is moved to a specific position for filtering , to provide output light in the desired frequency band.

However, the mechanical switching device is bulky and requires a long switching time, and the number of output optical frequency bands that can be provided is still limited by the characteristics and number of optical filters used, resulting in very limited application flexibility.

Contents of the invention

In view of this, how to effectively increase the flexibility of changing the frequency band of output light and shorten the time required for switching frequency bands more effectively is a problem to be solved in the industry.

This specification provides an embodiment of an adjustable spectrum resynthesis device, which includes: a wedge-shaped filter, including a plurality of filter sections, respectively used to filter an incident light to simultaneously generate multiple channels of light of different frequency bands; The liquid crystal module includes a plurality of gating sections, which are respectively used for gating the multiple channels of light of different frequency bands generated by the wedge filter; a driving circuit, coupled to the liquid crystal module, configured to drive the liquid crystal module The liquid crystal molecules in it; a parameter setting circuit, configured to generate one or more setting parameters according to the user's control; a control circuit, coupled to the driving circuit and the parameter setting circuit, configured to generate one or more setting parameters according to the one or more A setting parameter controls the drive circuit to adjust the plurality of gating sections to selectively set one or more selected gating sections in the plurality of gating sections to a light-transmitting state, and simultaneously Setting the other gating sections in a non-transmissive state, so that at the same time, only part of the light rays of the multiple frequency bands can pass through the liquid crystal module; and an optical path adjustment device is set to adjust the liquid crystal The traveling path of the light of the module is used to synthesize an output light whose spectral composition is different from the incident light.

One of the advantages of the above embodiment is that the time required for the driving circuit to change the rotation angle of the liquid crystal molecules in the liquid crystal module is very short, so the control circuit can change the spectral components of the output light of the light path adjustment device very quickly.

Another advantage of the above embodiment is that there is no need to install moving parts required to switch multiple filters in the adjustable spectrum resynthesis device, so the size and weight of the adjustable spectrum resynthesis device can be effectively reduced.

Other advantages of the present invention will be explained in more detail with the following description and accompanying drawings.

Description of drawings

The drawings described here are used to provide a further understanding of the application and constitute a part of the application. The schematic embodiments and descriptions of the application are used to explain the application and do not constitute an improper limitation to the application.

FIG. 1 is a simplified exploded view of a tunable spectrum resynthesis device according to a first embodiment of the present invention.

FIG. 2 is a schematic diagram of the combination of the liquid crystal module and the polarizer in FIG. 1 .

FIG. 3 is a schematic diagram of another output light with different spectral components generated by the tunable spectrum resynthesis device in FIG. 1 .

FIG. 4 is a simplified exploded view of a tunable spectrum resynthesis device according to a second embodiment of the present invention.

FIG. 5 is a simplified exploded view of a tunable spectrum resynthesis device according to a third embodiment of the present invention.

【Symbol Description】

100, 400, 500 adjustable spectrum resynthesis device

102 incident light

104 output light

110 wedge filter

111-117 Filter section

120 LCD modules

121-127 Gating section

130 drive circuit

140 parameter setting circuit

150 control circuit

160 light path adjustment device

170 first polarizer

180 second polarizer

detailed description

Embodiments of the present invention will be described below in conjunction with related drawings. In the drawings, the same reference numerals represent the same or similar elements or method flows.

FIG. 1 is a simplified exploded view of a tunable lightspectrum resynthesizing device 100 according to a first embodiment of the present invention. The adjustable spectrum resynthesis device 100 includes a wedge filter (wedge filter) 110, a liquid crystal module (liquid crystal module) 120, a driver circuit (driver circuit) 130, a parameter setting circuit (parameter setting circuit) 140, a control The circuit 150 , a light path redirecting device 160 , a first polarizer 170 , and a second polarizer 180 .

In the tunable spectrum resynthesis device 100 , the wedge filter 110 includes a plurality of filter sections, which are respectively used to filter the incident light 102 of a wide frequency band to simultaneously generate multiple light beams of different frequency bands. The aforementioned incident light 102 with a wide frequency band refers to light with a frequency band covering a range exceeding 300 nm. In practice, the wedge filter 110 can be realized by a linear variable filter, or can also be realized by a traditional dichroic prism.

The liquid crystal module 120 is located in the light emitting direction of the wedge-shaped filter 110, and includes a plurality of gating sections (gating sections), which are respectively used for gating multiple channels of light of different frequency bands generated by the wedge-shaped filter 110, that is, , are respectively used to control whether to allow multiple channels of light of different frequency bands output by the wedge filter 110 to pass through the liquid crystal module 120 .

For convenience of description, it is assumed that the wedge filter 110 includes the filter sections 111-117 and the liquid crystal module 120 includes the gating sections 121-127. The gate control sections 121 - 127 are respectively used to control whether to let the multiple channels of light of different frequency bands output by the filter sections 111 - 117 pass through the liquid crystal module 120 .

For example, the frequency band of the incident light 102 may cover the range of 350-850nm. In one embodiment, the filter section 111 only allows spectral components belonging to a first frequency band (for example, a frequency band of 350-420nm) in the incident light 102 to pass through, and the filter section 112 only allows the incident light 102 to belong to a first frequency band. The spectral components of the second frequency band (for example, the frequency band of 421-490nm) are passed, and the rest are deduced by analogy. Therefore, the filter section 117 only allows spectral components belonging to a seventh frequency band (for example, a frequency band of 771-850 nm) in the incident light 102 to pass through.

The gate control section 121 is used to control whether to allow the light of the first frequency band output by the filter section 111 to pass through the liquid crystal module 120, and the gate control section 122 is used to control whether to allow the light of the second frequency band output by the filter section 112 to pass through LCD module 120, and so on. Therefore, the gate control section 127 is used to control whether to let the light of the seventh frequency band output by the filter section 117 pass through the liquid crystal module 120 .

Please note that the above-mentioned filter sections 111-117 may be virtual segmentation concepts, and there is no limitation that there must be a physical spacer structure between two adjacent filter sections. Similarly, the aforementioned gate control sections 121 - 127 may also be virtual segment concepts, and there is no limitation that there must be a physical spacer structure between two adjacent gate control sections.

The driving circuit 130 is coupled to the liquid crystal module 120 and configured to drive liquid crystal cells in the liquid crystal module 120 . The parameter setting circuit 140 is configured to generate one or more setting parameters related to the output spectrum components of the tunable spectrum resynthesis device 100 according to the user's control. In practice, the parameter setting circuit 140 can be realized by various instruction or parameter input devices.

The control circuit 150 is coupled to the driving circuit 130 and the parameter setting circuit 140, and is configured to control the driving circuit 130 to adjust the plurality of gating sections in the liquid crystal module 120 according to one or more setting parameters generated by the parameter setting circuit 140. 121-127, to selectively set one or more selected gating sections (selected gating sections) in the gating sections 121-127 to the light-transmitting state, and simultaneously set other unselected gating sections The sections are set in a non-transmissive state, so that the light of multiple frequency bands output by the filter sections 111 - 117 can only pass through the liquid crystal module 120 at the same time.

The light path adjusting device 160 is located in the light emitting direction of the liquid crystal module 120 and configured to adjust the traveling path of the light passing through the liquid crystal module 120 to synthesize an output light 104 with spectral components different from the incident light 102 . In practice, the optical path adjustment device 160 can be implemented by multiple bundles of optical fibers or multiple light guide devices respectively connected to the light-emitting surfaces of the multiple gate control sections 121-127, or can be implemented by using Direction of a single condenser lens to achieve.

In the embodiment of FIG. 1 , the first polarizer 170 is located between the wedge filter 110 and the liquid crystal module 120 , and the second polarizer 180 is located between the liquid crystal module 120 and the light path adjusting device 160 . The polarization directions of the first polarizer 170 and the second polarizer 180 cooperate with the liquid crystal module 120 to jointly control whether the light can be output to the light path adjusting device 160 .

In practice, the first polarizer 170 and the second polarizer 180 can be directly arranged on the light incident surface and the light output surface of the liquid crystal module 120, as shown in FIG. 2, so as to reduce the volume of the adjustable spectrum resynthesis device 100 .

It can be seen from the above description that as long as the user adjusts the setting parameters by using the parameter setting circuit 140, the control circuit 150 will control the driving circuit 130 to change the rotation angle of the liquid crystal molecules in each gating control section 121-127 to individually control the gating control section 121-127 whether to allow light to pass through.

For example, when the user needs the light output by the adjustable spectrum resynthesis device 100 to be composed of the spectral components belonging to the first frequency band, the third frequency band, and the sixth frequency band in the incident light 102, the user can use the parameter setting circuit Step 140 is to set corresponding parameters. At this time, as shown in FIG. 1 , the control circuit 150 will control the drive circuit 130 to control the selected gating sections 121 corresponding to the spectral components of the first frequency band, the third frequency band, and the sixth frequency band in the incident light 102 respectively. , 123, and 126 are all set to the light-transmitting state, and at the same time other gating sections 122, 124, 125, and 127 are set to the non-light-transmitting state, so that the multi-channel different frequency bands output by the wedge filter 110 At the same time, only the spectral components of the first frequency band, the third frequency band, and the sixth frequency band can pass through the liquid crystal module 120 .

In this way, the spectral components of the output light 104 synthesized by the optical path adjustment device 160 will only be composed of the spectral components belonging to the first frequency band, the third frequency band, and the sixth frequency band in the incident light 102, and will not Contains spectral components from other frequency bands.

For another example, when the user requires that the light output by the tunable spectrum resynthesis device 100 is composed of spectral components belonging to the third frequency band, the fourth frequency band, and the fifth frequency band in the incident light 102, the user can use the parameter setting The circuit 140 sets the corresponding parameters. At this time, as shown in FIG. 3 , the control circuit 150 will control the driving circuit 130 to control the selected gating sections 123 corresponding to the spectral components of the third frequency band, the fourth frequency band, and the fifth frequency band in the incident light 102 respectively. , 124, and 125 are set to the light-transmitting state, and at the same time, other gating sections 121, 122, 126, and 127 are set to the non-light-transmitting state, so that the wedge-shaped filter 110 outputs multiple channels of different frequency bands At the same time, only the spectral components of the third frequency band, the fourth frequency band, and the fifth frequency band can pass through the liquid crystal module 120 .

In this way, the spectral components of the output light 304 synthesized by the optical path adjustment device 160 will only be composed of the spectral components belonging to the third frequency band, the fourth frequency band, and the fifth frequency band in the incident light 102, and will not Contains spectral components from other frequency bands.

Since the time required for the drive circuit 130 to change the rotation angle of the liquid crystal molecules in the liquid crystal module 120 is very short (far less than 0.1 second), the user only needs to change the setting parameters through the parameter setting circuit 140, and the control circuit 150 can be very quickly. The spectral components that can pass through the liquid crystal module 120 are changed, thereby changing the spectral components of the output light from the light path adjusting device 160 .

In some embodiments, the control circuit 150 can also control the driving circuit 130 to set the aforementioned selected gating sections (for example, 121, 123, 126) according to the one or more setting parameters generated by the parameter setting circuit 140. The rotation angle of the liquid crystal molecules is used to separately control the luminous flux of each selected gating section. In other words, the control circuit 150 can further control the magnitude of the luminous flux of individual selected gating control sections, so that the magnitude of the luminous flux of different selected gating control sections is different. In this way, the diversity and variation of the output light that the tunable spectrum resynthesis device 100 can provide can be further increased.

Please note that there is no diffuser sheet or diffuser plate between the aforementioned wedge-shaped filter 110 and the liquid crystal module 120, otherwise it will interfere with the reception of the gate control sections 121-127. The difference between the frequency bands of the light received is very different from that of traditional liquid crystal displays, where a diffuser or diffuser plate structure is installed between the liquid crystal module and the backlight to make the light uniform.

In the aforementioned embodiments, the number of filter sections in the wedge filter 110 and the number of gating sections in the liquid crystal module 120 are just an exemplary embodiment, rather than limiting the actual implementation of the present invention. . In practice, the number of filtering sections of the wedge-shaped filter 110 and the number of gating sections of the liquid crystal module 120 can be increased or decreased, and the number of gating sections of the liquid crystal module 120 can also be set to be the same as the wedge-shaped The number of filter sections of the filter 110 is different.

In addition, in the foregoing embodiments, the tunable spectrum resynthesis device 100 uses the first polarizer 170 and the second polarizer 180 at the same time, but this is only an exemplary embodiment, and does not limit the actual structure of the present invention.

For example, FIG. 4 is a simplified exploded diagram of a tunable spectrum resynthesis device 400 according to a second embodiment of the present invention. The structure of the tunable spectrum resynthesis device 400 is very similar to the aforementioned tunable spectrum resynthesis device 100 , but the aforementioned second polarizer 180 is omitted in the tunable spectrum resynthesis device 400 to reduce the number of required components.

As another example, FIG. 5 is a simplified exploded diagram of a tunable spectrum resynthesis device 500 according to a third embodiment of the present invention. The structure of the tunable spectrum resynthesis device 500 is similar to the aforementioned tunable spectrum resynthesis device 100 , but the aforementioned first polarizer 170 is omitted in the tunable spectrum resynthesis device 500 to reduce the number of required components.

The foregoing descriptions about the operations, connections, implementation methods, and related advantages of other components in the tunable spectrum resynthesis device 100 are also applicable to the tunable spectrum resynthesis devices 400 and 500 . For the sake of brevity, the description is not repeated here.

It can be seen from the foregoing description that the control circuit 150 can determine whether the gate control sections 121-127 allow the filter section 111- The light of different frequency bands output by 117 enters the light path adjusting device 160 . Since the time required for the drive circuit 130 to change the rotation angle of the liquid crystal molecules in the liquid crystal module 120 is extremely short, which is much less than the time required for the traditional mechanical switching device to switch the filter, the aforementioned adjustable spectrum resynthesis device 100 , 400, or 500 changes the spectral components of the output light of the light path adjustment device 160, which is much faster than the traditional mechanical structure.

In addition, since the aforementioned tunable spectrum resynthesis device 100, 400, or 500 does not need to set moving parts (moving parts) required for switching a plurality of filters, it can effectively reduce the number of tunable spectrum resynthesis devices 100, 400, Or the size and weight of 500.

Moreover, the liquid crystal module 120 itself has polarization, so the use of the liquid crystal module 120 as a gating device for the light of different frequency bands output by the filter sections 111-117 can provide output light with a polarization effect, which is more suitable for some fields. application.

Certain terms are used in the description and claims to refer to particular elements. However, those skilled in the art should understand that the same element may be called by different terms. The specification and claims do not use the difference in name as the way to distinguish components, but the difference in function of the components as the basis for distinction. The "comprising" mentioned in the specification and claims is an open term, so it should be interpreted as "including but not limited to". In addition, "coupling" here includes any direct and indirect connection means. Therefore, if it is described that the first element is coupled to the second element, it means that the first element can be directly connected to the second element through electrical connection or signal connection means such as wireless transmission or optical transmission, or through other elements or connections. The means are indirectly electrically or signally connected to the second element.

The description of "and/or" used herein includes any combination of one or more of the listed items. In addition, unless otherwise specified in the specification, any singular term also includes plural meanings.

The term "element" mentioned in the specification and claims includes the concepts of component, layer, or region.

The dimensions and relative sizes of some elements in the drawings will be exaggerated, or the shapes of some elements will be simplified in order to express the contents of the embodiments more clearly. Therefore, unless otherwise specified by the applicant, the shape, size, relative size and relative position of each element in the drawings are only for convenience of description, and should not be used to limit the patent scope of the present invention. In addition, the present invention can be embodied in many different forms, and when explaining the present invention, it should not be limited only to the embodiments presented in this specification.

For the convenience of description, some descriptions related to relative positions in space may be used in the description to describe the function of an element in the drawings or the relative spatial relationship between the element and other elements. For example, "on," "above," "below," "below," "above," "below," "up," "down," and the like. Those skilled in the art should understand that these descriptions related to relative positions in space not only include the orientation of the described elements in the drawings, but also include the use, operation, or orientation of the described elements. Various pointing relationships during assembly. For example, if the drawing is turned upside down, an element originally described as "on" will become "below". Therefore, the description of "on" used in the specification includes two different pointing relationships of "below" and "on". In the same way, the term "upward" used here includes two different pointing relationships of "upward" and "downward".

In the specification and claims, if it is described that a first element is located on, above, connected, bonded, coupled to, or in contact with a second element, it means that the first element can be directly connected to the second element. Located on the second element, directly connected, directly bonded, or directly coupled to the second element may also mean that there are other elements between the first element and the second element. In contrast, if it is described that the first element is directly on the second element, directly connected, directly bonded, directly coupled, or directly connected to the second element, it means that there are no other elements between the first element and the second element .

The above are only preferred embodiments of the present invention, and all equivalent changes and modifications made according to the claims of the present invention shall fall within the scope of the present invention.

Claims (9)

1. a kind of adjustable spectrum synthesizer (100 again；400；500), comprising：

One wedge-shaped filter (110), comprising multiple filter segments (111-117), is respectively used to filtering one incident Light (102) is with the light of generation multiple tracks different frequency range simultaneously；

One Liquid Crystal Module (120), includes multiple lock control sections (121-127), is respectively used to the lock control wedge shape The light of the multiple tracks different frequency range produced by filter (110)；

One drive circuit (130), is coupled to the Liquid Crystal Module (120), is arranged to drive the Liquid Crystal Module (120) In liquid crystal molecule；

One parameter setting circuit (140), is arranged to produce one or more arrange parameters according to the control of user；

One control circuit (150), is coupled to the drive circuit (130) and the parameter setting circuit (140), sets The drive circuit (130) is controlled to adjust the plurality of lock control section respectively into according to one or more arrange parameters (121-127), with optionally by one or more the selected Zha Kong areas in the plurality of lock control section (121-127) Section (121,123,126) is set to light-permeable state, and simultaneously by other lock control sections (122,124,125, 127) be set to can not light transmission state so that the light of the multiple tracks different frequency range in the same time only have portion The light of frequency-division section is able to by the Liquid Crystal Module (120)；And

One light path adjusting apparatus (160), are arranged to the traveling of the light that adjustment passes through the Liquid Crystal Module (120) Path, to synthesize an output light (104) of the spectral component different from the incident light (102).

2. adjustable spectrum as claimed in claim 1 synthesizer (100 again；400；500), wherein, The control circuit (150) also controls the drive circuit (130) according to one or more arrange parameters, is respectively provided with The liquid crystal molecule anglec of rotation of each selected lock control section (121,123,126), to control each selected lock respectively The luminous flux size of control section (121,123,126).

3. adjustable spectrum as claimed in claim 2 synthesizer (100 again；400；500), wherein, The control circuit (150) also controls the drive circuit (130) according to one or more arrange parameters, will at least one The liquid crystal molecule anglec of rotation of individual selected lock control section (121) be arranged to other selected lock control sections (123, 126) it is different.

4. adjustable spectrum as claimed in claim 1 synthesizer (100 again；400；500), wherein, The wedge-shaped filter (110) is a linear change filter.

5. adjustable spectrum as claimed in claim 1 synthesizer (100 again；400), it is additionally comprised：

One polarizer (170), between the wedge-shaped filter (110) and the Liquid Crystal Module (120).

6. adjustable spectrum as claimed in claim 1 synthesizer (100 again；500), it is additionally comprised：

One polarizer (180), between the Liquid Crystal Module (120) and the light path adjusting apparatus (160).

7. adjustable spectrum as claimed in claim 1 synthesizer (100) again, it is additionally comprised：

One first polarizer (170), between the wedge-shaped filter (110) and the Liquid Crystal Module (120)；With And

One second polarizer (180), positioned at the Liquid Crystal Module (120) and the light path adjusting apparatus (160) it Between.

8. adjustable spectrum as claimed in claim 7 synthesizer (100) again, wherein, wedge shape optical filtering Device (110) is a linear change filter.

9. synthesizer (100 again of the adjustable spectrum as any one of claim 1 to 8；400； 500), wherein, between the wedge-shaped filter (110) and the Liquid Crystal Module (120) and be not provided with any expansion Discrete piece or diffuser plate.