DE102004060100A1 - Building/motor vehicle surface area surveillance method, involves detecting presence of chemical solvent in wall surface by gas sensor and detecting specific noise arising due to person movement near surface by ultrasound sensor - Google Patents

Abstract

The method involves detecting a chemical solvent presence in a wall surface by a gas sensor (2) and detecting specific noises arising due to person movement by an ultrasound sensor. The solvent is dispensed by a dispenser when a person is found near the surface. An alarm signal indicating the presence of the person is provided by an evaluating processor unit to a radio reporting point when the unit receives the sensor signals. An independent claim is also included for a device surveillance of a surface area of a building or a motor vehicle.

Description

The The invention relates to a method and a device for monitoring a surface of buildings or vehicles in which, by means of the surface to be monitored, selective gas sensors for the unauthorized attachment of chemical substances an alarm is triggered and directed to a hotline.

At buildings and public Transportation will be in great Scope of property damage chemical attacks, especially sprayed graffiti, caused.

in the In the state of the art, various measures have been developed to recognize such attacks or to the resulting damage reduce.

To DE 295 18 344 It is known that the respective wall surfaces to protect against graffiti with protective films. It is also attempted, by washable protective coatings, to facilitate the cleaning of the sprayed surfaces.

at the use of protective films and protective coatings can be applied Graffiti can not be prevented. The workload to restore of the desired Condition is opposite an unprotected one Arrangement reduced, by the necessary attachment of this protective means to be protected surfaces and to clean them, however, there is still a high level of labor and cost required.

In US 2002/0008619 A1 discloses a graffiti protection system, in the monitoring by detecting the sound produced during the spraying process he follows.

The Detection of sound signals during the spraying process is faulty due to a variety of fault possibilities.

It is also after DE 102 33 735 A1 a method for monitoring graffiti-endangered vehicles is known, monitored with the reducing gases on a hazardous wall surface by gas sensors and an electronic circuit output an output signal and, if necessary, a "silent alarm" is transmitted to a hotline.

Also in this arrangement is disadvantageous that by various types influences False alarms triggered can be for example, by the exhaust gases passing by motor vehicles.

Of the Invention is based on the object, a method and an apparatus specify the type mentioned, with the unauthorized attachment Detected chemical substances on a wall surface with high security can be.

The Task is according to the invention with a Method having the features specified in claim 1, and with a device which the specified in claim 4 Has features solved.

advantageous Embodiments are specified in the subclaims.

The inventive method and the device according to the invention are capable of detecting situations with the aid of sensors which chemicals such as solvents and / or other characteristic chemical substances applied to surfaces to destroy the look of an object. For this purpose, z. As graffiti, unwanted attachment of chemical substances surfaces or similar Events like objects or living beings with specific chemical emissions or noises.

There the chemical information with those known in the art Gas sensors are obtained, are not sufficiently selective, points the inventive arrangement special gas sensors due to the use of multiple active layers selective to certain solvents are tuned, as well as facilities for the evaluation of electromagnetic Fields at approach be influenced by persons.

The Device may advantageously be provided by noise detectors, For example, ultrasonic sensors, the specific noise, which at the application of the substances arise or during the movement of objects or sentient beings are evoked, detected, supplemented.

The Invention will be explained in more detail below with reference to an embodiment.

In the associated Show drawing:

1 a schematic representation of the arrangement,

2 a block diagram of the monitoring device, and

3 the arrangement of a gas sensor with integrated reference loop.

In 1 is an example of monitoring a building wall 1 shown. In this is not visible from the outside a gas sensor 2 which is arranged in a, the reference resonant circuit not influencing housing and a reference loop 3 enclosed, attached. The reference loop 3 is with one or more wire loops 4 and the evaluation unit 5 coupled.

The electrical circuit explained 2 using a block diagram. When a person 8th near the wall surface to be monitored 1 located and a spray can 9 operated, is exceeded by a predetermined limit, the presence of special chemical solvents in the vicinity of the wall surface to be monitored 1 from the gas sensor 2 a signal to the evaluation unit 5 transmitted. At the same time, the presence of a person 8th detected by the fact that an additional signal, which is obtained from a disturbance of an open oscillatory circuit, from the evaluation unit 5 is detected. The open circuit contains one or more coils in the form of wire loops 4 as well as the reference loop 3 , It is advantageous to be monitored on the wall surface 1 to arrange several open oscillating circuits with different detection ranges. If both signals are present at the evaluation unit 5 sends an alarm signal to the registration office 6 from which measures are then taken. Additionally, from the registration office 6 Warnings be prompted. In the case shown, there is an acoustic and / or optical alarm device in the vicinity of the wall surface to be monitored 1 , The alarm can also be triggered so that it is from the person 8th not noticed. It is also possible that the device contains additional sensors for detecting characteristic background noise.

In 3 is an embodiment for the arrangement of a gas sensor 2 shown. In one, the reference resonant circuit not influencing housing 2.1 is one with one or more gas sensitive layers and a temperature sensitive heater 2.4 provided chip 2.2 on a carrier 2.3 arranged, wherein the sensitive layer emits at least two signals. The arrangement is with a potting 2.5 protected, with a membrane 2.6 closed top of the gas sensor 2 from the casting 2.5 protrudes. The chip 2.2 is connected to connections not shown here. Outside the case 2.1 runs the integrated reference loop 3 , Below chips 2.2 is a floor 2.7 arranged.

1

building wall

2

gas sensor

2.1

casing

2.2

chip

2.3

carrier

2.4

stoker

2.5

grouting

2.6

membrane

2.7

ground

3

reference loop

4

Resonant circuit loop

5

evaluation

6

registration office

7

alarm device

8th

person

9

spray bottle

Claims (7)

Method of monitoring an area of buildings or vehicles by means of selective gas sensors mounted on the area to be monitored ( 2 ) an alarm is triggered during the unauthorized attachment of chemicals and sent to a hotline ( 6 ), characterized in that recorded on the wall surface to be monitored by means of detectors for detecting chemical solvents, the occurrence of these and evaluated and when exceeding a predetermined limit and an additional the presence of persons ( 8th ) characterizing signal an alarm signal to the reporting office ( 6 ) is transmitted. Method according to claim 1, characterized in that the signal for detecting the presence of a person ( 8th ) is obtained by influencing at least one open resonant circuit. Method according to claim 1 or 2, characterized that at the causer site when addressing the sensors optical and / or audible alarm is triggered. Device for monitoring an area of buildings or vehicles, in which by means of selective gas sensors mounted on the surface to be monitored ( 2 ) an alarm is triggered during the unauthorized attachment of chemicals and sent to a hotline ( 6 ), characterized in that on the surface to be monitored at least one selective gas sensor ( 2 ) for detecting chemical solvents combined with at least one open oscillating circuit which triggers a characterizing signal for the presence of persons, the gas sensor ( 2 ) in a, the reference resonant circuit not influencing housing ( 2.1 ) is arranged and the Housing in a reference loop ( 3 ) is arranged for the resonant circuit arrangement, which serves as a compensation element for large-scale interference. Device according to claim 4, characterized in that that at the to be monitored area several open oscillating circuits with different detection ranges are arranged. Apparatus according to claim 4 or 5, characterized that the device has additional sensors contains for detecting characteristic sound scenes. Device according to one of claims 4 to 6, characterized in that the device comprises means for triggering an optical and / or acoustic alarm at the polluter.