CN202676594U - High-sensitivity sensing system based on infrared spectrum - Google Patents
High-sensitivity sensing system based on infrared spectrum Download PDFInfo
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- CN202676594U CN202676594U CN 201220365714 CN201220365714U CN202676594U CN 202676594 U CN202676594 U CN 202676594U CN 201220365714 CN201220365714 CN 201220365714 CN 201220365714 U CN201220365714 U CN 201220365714U CN 202676594 U CN202676594 U CN 202676594U
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Abstract
The utility model discloses a high-sensitivity sensing system based on an infrared spectrum, which relates to an infrared-spectrum-based sensing system, and aims to solve the problems that the existing gas sensor is narrow in detection range, low in detection accuracy and difficult to detect high-concentration gas. According to the high-sensitivity sensing system, an infrared radiated emission source emits infrared light waves to an absorption air chamber, and after the infrared light waves are refracted by the absorption air chamber, one part of the infrared light waves are filtered by a light filter with wave length lambda 1 and then come into a photosensitive surface of an infrared radiation receiver of light waves with wave length lambda 1; the infrared radiation receiver of the light waves with wave length lambda 1 sends collected signals to a processor; after the infrared light waves are refracted by the absorption air chamber, one part of the infrared light waves are filtered by a light filter with wave length lambda 2 and then come into a photosensitive surface of an infrared radiation receiver of light waves with wave length lambda 2; and the infrared radiation receiver of the light waves with wave length lambda 2 sends collected signals to the processor. The high-sensitivity sensing system is applied to safety monitoring on a coal mine.
Description
Technical field
The utility model relates to a kind of sensor based on infrared spectrum.
Background technology
Gas accident is that maximum great, serious accident occur in the colliery, can bring great casualties and economic loss.For this reason, gas concentration monitoring becomes one of main work of coal production supervision department.Simultaneously, carry out the coal-mine gas testing and become the necessary condition whether colliery can produce.
At present, the sensor that is used for gas concentration monitoring almost at home each colliery use.But its existing firedamp sensor has that sensing range is narrow, accuracy of detection is low, and is difficult to detect the problem such as high concentration gas.In addition, interchangeability, the consistance of air-sensitive detecting sensor are poor, need frequent adjustment, and use inconvenient.Therefore research and develop new type mining high sensitivity infrared gas senor to improving China's coal-mine safety monitoring level, preventing that coal mine gas explosion etc. from providing sound assurance.Sustainable development to the coal in China cause plays important and far-reaching meaning.
The utility model content
The purpose of this utility model is to have for existing firedamp sensor that sensing range is narrow, accuracy of detection is low, and is difficult to detect the problem of high concentration gas, and a kind of high sensitivity sensor-based system based on infrared spectrum is provided.
The utility model is the high sensitivity sensor-based system based on infrared spectrum, and it comprises the infrared radiation emissive source, absorbs air chamber, the optical filter of wavelength X 1, the optical filter of wavelength X 2, the infrared radiation sensor of λ 1 light wave, infrared radiation sensor and the processor of λ 2 light waves;
Infrared radiation emissive source emission infrared waves is to absorbing air chamber,
This infrared waves is through after absorbing air chamber refraction, and a part is incident to after the optical filter filtering of wavelength X 1 in the photosurface of infrared radiation sensor of λ 1 light wave; The infrared radiation sensor of λ 1 light wave is sent to processor with the signal that gathers;
This infrared waves is through after absorbing air chamber refraction, and a part is incident to after the optical filter filtering of wavelength X 2 in the photosurface of infrared radiation sensor of λ 2 light waves; The infrared radiation sensor of λ 2 light waves is sent to processor with the signal that gathers.
The utility model has the advantages that: by air chamber structure reasonable in design and signal conditioning circuit, successfully with the signal extraction of pyroelectric detector out, realize data sampling, data processing, the sound and light alarm that transfinites, real-time display density value, CAN bus and RS485 bus communication, the electric current/functions such as frequency signal output.It is widely used in the coal mine safety monitoring, can brings higher economic and social benefit aspect.
Description of drawings
Fig. 1 is structural representation of the present utility model;
Fig. 2 is the infrared thermal release electric detector internal circuit diagram;
Fig. 3 is for absorbing the structural representation of air chamber 2;
Fig. 4 is the interface circuit figure of DAC and AD694;
Fig. 5 is the modulation circuit figure of infrared radiation emissive source 1.
Embodiment
Embodiment one: below in conjunction with Fig. 1 and Fig. 3 present embodiment is described,
Based on the high sensitivity sensor-based system of infrared spectrum, it comprises infrared radiation emissive source 1, absorbs air chamber 2, the optical filter 3 of wavelength X 1, the optical filter 4 of wavelength X 2, the infrared radiation sensor 5 of λ 1 light wave, infrared radiation sensor 6 and the processor 7 of λ 2 light waves;
Infrared radiation emissive source 1 emission infrared waves is to absorbing air chamber 2,
This infrared waves is through after absorbing air chamber 2 refractions, and a part is incident to after optical filter 3 filtering of wavelength X 1 in the photosurface of infrared radiation sensor of λ 1 light wave; The infrared radiation sensor of λ 1 light wave is sent to processor with the signal that gathers;
This infrared waves is through after absorbing air chamber 2 refractions, and a part is incident to after optical filter 4 filtering of wavelength X 2 in the photosurface of infrared radiation sensor of λ 2 light waves; The infrared radiation sensor of λ 2 light waves is sent to processor with the signal that gathers.
Embodiment two: below in conjunction with Fig. 1 and Fig. 3 present embodiment is described, present embodiment is for to the further specifying of the absorption air chamber 2 of embodiment one,
Be provided with catoptron 8 and temperature sensor 9 in the described absorption air chamber 2 of present embodiment; Described catoptron 8 is fixedly mounted on and absorbs on air chamber 2 inwalls, and is oppositely arranged with the infrared radiation emissive source 1, the optical filter 3 of wavelength X 1 and the optical filter 4 of wavelength X 2 that absorb air chamber 2 outsides; Optical filter 3 homonymies of temperature sensor 9 and wavelength X 1, and be arranged on the top of the optical filter 3 of wavelength X 1.
Embodiment three: below in conjunction with Fig. 1 present embodiment is described, present embodiment is for to the further specifying of the infrared radiation sensor 6 of the infrared radiation sensor 5 of λ 1 light wave of embodiment one and λ 2 light waves,
The infrared radiation sensor 5 of described λ 1 light wave of present embodiment and the infrared radiation sensor 6 of λ 2 light waves all adopt infrared thermal release electric detector to realize.
Embodiment four: below in conjunction with Fig. 1 present embodiment is described, present embodiment is for to the further specifying of the processor 7 of embodiment one,
The described processor 7 of present embodiment is to adopt the C8051F041 chip microcontroller.
Embodiment five: present embodiment is described below in conjunction with Fig. 1 and Fig. 6, present embodiment is further specifying embodiment one, the described high sensitivity sensor-based system based on infrared spectrum of present embodiment, it also comprises sound light alarming circuit, this sound light alarming circuit is comprised of photoelectrical coupler 3U1, current-limiting resistance 3R1, LED lamp IR, NPN type triode T6 and filter capacitor 3CI
The negative electrode of the light emitting diode in the end of the anodic bonding current-limiting resistance 3R1 of the light emitting diode in the described photoelectrical coupler 3U1, photoelectrical coupler 3U1 connects power supply ground; The end that the collector of the photosensitive triode in the photoelectrical coupler 3U1 connects LED lamp IR simultaneously is connected collector and is connected with NPN type triode T6; The emitter of the phototriode in the photoelectrical coupler 3U1 connects the base stage of NPN type triode T6, and the emitter of NPN type triode T6 connects power supply ground;
The other end of LED lamp IR connects positive source, and the positive pole of filter capacitor 3CI connects positive source, and the negative pole of this filter capacitor 3CI connects power supply ground.
Specific embodiment: be implemented example below in conjunction with Fig. 1 to Fig. 5 explanation:
(1) design makes whole system compact, and adopts novel Non-Dispersive Infra-red (NDIR) (NDIR) technology based on the high sensitivity sensor-based system of infrared spectrum, improves the sensitivity of surveying; Adopt the incandescent lamp infrared light supply as the infrared radiation emissive source and adopt pyroelectric infrared detector as infrared radiation sensor spare, method by experiment, determine infrared light supply modulating frequency and these two key parameters of sampling air chamber length, and under laboratory condition, stability, response time and the sensitivity of sensor are tested and analyzed;
(2) filtering and amplifying circuit of employing feeble signal, operational amplifier is selected LM324, improves signal to noise ratio (S/N ratio) and the precision of whole detection system;
(3) select the C8051F041 single-chip microcomputer as core, finish A/D sampling and data and process, judge the functions such as processing, data transfer, sound light alarming circuit is made of hummer, current-limiting resistance, LED and NPN type triode, P1.7 (SOUND) mouthful of control audible alarm by single-chip microcomputer, P1.6 (LIGHT) mouthful of control 9786 light by single-chip microcomputer are reported to the police, the standard switching key on the Infrared remote controller is used in signal output, and selection is standard or non-standard signal Output system.Export such as modes such as current signal 0～5mA, 1～5mA, 0～10mA, 4～20mA and frequency signal 0～500Hz, 200～600～960Hz, 200～1000Hz, 200～1000～1960Hz, 0～5000Hz.When output current signal, realized by the D/A converter (DAC) of single-chip microcomputer inside, when the needs output frequency signal, finished by the programmable counter array (PCA0) of single-chip microcomputer inside.
(4) reach when presetting alarm set point (0.75%, 1%) when concentration of methane gas, report to the police by modes such as luminous, sounding.
The software aspect adopts the modularization programming method, take full advantage of the characteristic of single-chip microcomputer low-power consumption, adopt timer interrupt mode, and each functions of modules such as the master routine by mcu programming having been realized infrared gas senor, signal sampling, data processing, signal output, keyboard input, data communication.At last, by the design studies to these program modules, design the software program that satisfies infrared gas senor function and technical requirement.
The utility model is not limited to above-mentioned embodiment, can also be the reasonable combination of technical characterictic described in the respective embodiments described above.
Claims (5)
1. based on the high sensitivity sensor-based system of infrared spectrum, it is characterized in that: it comprises infrared radiation emissive source (1), absorbs air chamber (2), the optical filter (3) of wavelength X 1, the optical filter (4) of wavelength X 2, the infrared radiation sensor (5) of λ 1 light wave, infrared radiation sensor (6) and the processor (7) of λ 2 light waves;
Infrared radiation emissive source (1) emission infrared waves is to absorbing air chamber (2),
This infrared waves is through after absorbing air chamber (2) refraction, and a part is incident to after optical filter (3) filtering of wavelength X 1 in the photosurface of infrared radiation sensor of λ 1 light wave; The infrared radiation sensor of λ 1 light wave is sent to processor with the signal that gathers;
This infrared waves is through after absorbing air chamber (2) refraction, and a part is incident to after optical filter (4) filtering of wavelength X 2 in the photosurface of infrared radiation sensor of λ 2 light waves; The infrared radiation sensor of λ 2 light waves is sent to processor with the signal that gathers.
2. the high sensitivity sensor-based system based on infrared spectrum according to claim 1 is characterized in that: be provided with catoptron (8) and temperature sensor (9) in the described absorption air chamber (2); Described catoptron (8) is fixedly mounted on and absorbs on air chamber (2) inwall, and outside infrared radiation emissive source (1), the optical filter (3) of wavelength X 1 and the optical filter (4) of wavelength X 2 is oppositely arranged with absorbing air chamber (2); Optical filter (3) homonymy of temperature sensor (9) and wavelength X 1, and be arranged on the top of the optical filter (3) of wavelength X 1.
3. the high sensitivity sensor-based system based on infrared spectrum according to claim 1 is characterized in that: the infrared radiation sensor (5) of described λ 1 light wave and the infrared radiation sensor (6) of λ 2 light waves all adopt infrared thermal release electric detector to realize.
4. the high sensitivity sensor-based system based on infrared spectrum according to claim 1 is characterized in that: described processor (7) is to adopt the C8051F041 chip microcontroller.
5. the high sensitivity sensor-based system based on infrared spectrum according to claim 1, it is characterized in that: it also comprises sound light alarming circuit, this sound light alarming circuit is comprised of photoelectrical coupler (3U1), current-limiting resistance (3R1), LED lamp (IR), NPN type triode (T6) and filter capacitor (3CI), the negative electrode of the light emitting diode in one end of the anodic bonding current-limiting resistance (3R1) of the light emitting diode in the described photoelectrical coupler (3U1), photoelectrical coupler (3U1) connects power supply ground; The end that the collector of the photosensitive triode in the photoelectrical coupler (3U1) connects LED lamp (IR) simultaneously is connected T6 with NPN type triode) collector connect; The emitter of the phototriode in the photoelectrical coupler (3U1) connects the base stage of NPN type triode (T6), and the emitter of NPN type triode (T6) connects power supply ground; The other end of LED lamp (IR) connects positive source, and the positive pole of filter capacitor (3CI) connects positive source, and the negative pole of this filter capacitor (3CI) connects power supply ground.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201220365714 CN202676594U (en) | 2012-07-26 | 2012-07-26 | High-sensitivity sensing system based on infrared spectrum |
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| CN 201220365714 CN202676594U (en) | 2012-07-26 | 2012-07-26 | High-sensitivity sensing system based on infrared spectrum |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104863633A (en) * | 2015-02-10 | 2015-08-26 | 山西大学 | Holistic detecting device for gas emission quantity of mine laneway inner wall surface |
| CN107636445A (en) * | 2015-03-09 | 2018-01-26 | 加州理工学院 | The spectroscopic system and its method of middle infrared high spectrum |
-
2012
- 2012-07-26 CN CN 201220365714 patent/CN202676594U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104863633A (en) * | 2015-02-10 | 2015-08-26 | 山西大学 | Holistic detecting device for gas emission quantity of mine laneway inner wall surface |
| CN107636445A (en) * | 2015-03-09 | 2018-01-26 | 加州理工学院 | The spectroscopic system and its method of middle infrared high spectrum |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130116 Termination date: 20130726 |