CN207937352U - A kind of sensing probe and non-dispersive infrared gas sensor detecting system - Google Patents
A kind of sensing probe and non-dispersive infrared gas sensor detecting system Download PDFInfo
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- CN207937352U CN207937352U CN201820339812.2U CN201820339812U CN207937352U CN 207937352 U CN207937352 U CN 207937352U CN 201820339812 U CN201820339812 U CN 201820339812U CN 207937352 U CN207937352 U CN 207937352U
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Abstract
The utility model discloses a kind of sensing probe for non-dispersive infrared gas sensor and non-dispersive infrared gas sensor detecting system, which includes infrared light supply, optics gas chamber, infrared Filter Array and infrared detector array；It is respectively equipped with air admission hole and venthole on optics gas chamber, is communicated under test gas environment by air admission hole and venthole；Infrared light supply is set to optics gas chamber head end；Infrared Filter Array and infrared detector array are sequentially arranged in optics gas chamber tail portion；Infrared Filter Array includes multiple detection optical filters and a comparison optical filter；Infrared detector array includes multiple infrared detectors, one-to-one with detection optical filter, comparison optical filter respectively；After infrared light supply is emitted wide range infrared light, it is emitted after optics gas chamber, infrared Filter Array successively, into infrared detector array.The utility model can be carried out at the same time the measurement of multiple gases concentration using infrared Filter Array and infrared detector array.
Description
Technical field
The utility model belongs to non-dispersive infrared sensor and is related to technical field, and in particular to one kind can carry out more gases
The non-dispersive infrared sensor sensing probe of Concentration Testing.
Background technology
With the development of gas probing, the demand of more gas-monitorings is also more and more.Gas detection technology life and
Application range is also more and more extensive in production, be specifically focused on coal-mine gas monitoring system comprising, fire detecting system, industrial flow,
Air quality monitoring etc..The sensor used to the detection of industrial flow gas concentration is mainly the following:First, catalysis burning
Formula gas sensor, imflammable gas under the action of catalyst, carry out combustion reaction under the conditions of certain temperature, resistance when burning
Temperature increases, and resistance changes, and changing value is the function of under test gas concentration, and this sensor can only detect flammable gas
Body has limitation；Second is that semiconductor-type gas sensor, at a certain temperature using some metal oxide semiconductor materials
Its conductivity changes principle manufacture as ambient gas composition changes, and this mode stability is poor；Third, heat-conducted gas passes
Sensor, the capacity of heat transmission having when being transmitted in gas with various using heat is different, by the thermal conductivity for measuring mixed gas
To obtain the volumn concentration of under test gas, this sensor is affected by temperature greatly, and tested gas concentration cannot be too low, by
Thermal conductivity between gas is close, and anti-interference ability is weak, can only measure two kinds of component gas；Fourth, chemical cell class senses
Device, it is a kind of sensor of consumption-type, although sensitivity increases, service life is short, generally only 1~2 year.With it
Compared to infrared gas sensor because of its good selectivity, be not easy the advantages that poisoning and aging, signal-to-noise ratio high, long lifespan, make
It is more and more.Its principle is based on langbobier law and Infrared spectra adsorption principle, and langbobier law is specifically public
Formula is：, whereinWhen being absorbed for no gas, the light intensity of infrared light supply,When to there is gas absorption, infrared light supply
Light intensity,For absorption coefficient,For intracavity gas concentration,For infrared light light path.
Infrared gas sensor can be divided into light splitting type and overstepping one's bounds light type again, due to overstepping one's bounds light type infrared gas sensor optics
Air chamber structure is simple, easily designed and maintenance, so mostly using non-dispersive infrared device sensor in practical application greatly.However, often
Non-dispersive infrared gas sensor can only often detect pure gas concentration during detection of gas, and right
In the measurement of multiple gases, the semiconductor laser using Fourier analyzer and multiple and different wavelength is needed, or switch more
A filter could be completed, and detection system is not only complicated, but also bulky.Meanwhile traditional NDIR systems is sensitive
Light path of the degree between by detector, the sensitivity of noise infrared radiation source and infrared radiation source and detector is influenced, and there are detection limit height etc.
Problem.
Therefore, it is necessary to existing non-dispersive infrared gas sensor gas chamber and gas Detection Techniques be improved, make it
Not only have the advantages that good service life length, good reliability, stability, high certainty of measurement, strong antijamming capability, solves in gas chamber
The problems such as light path light path is short and detection limit is high, also can measure multiple gases, can adapt to the industrial flow scene of various complexity
Use.
Invention content
Purpose of the utility model is to solve defects existing in the prior art, provide a kind of for non-dispersive infrared
Gas sensor and the sensing probe that multiple gases measurement of concetration can be carried out at the same time.
In order to achieve the above object, the utility model provides a kind of sensitive spy for non-dispersive infrared gas sensor
Head, including infrared light supply, optics gas chamber, infrared Filter Array and infrared detector array；It is respectively equipped on the optics gas chamber
Air admission hole and venthole are communicated by air admission hole and venthole under test gas environment；The infrared light supply is set to the optics
Gas chamber head end；The infrared Filter Array and infrared detector array are sequentially arranged in optics gas chamber tail portion；The infrared light
Chip arrays include multiple detection optical filters and a comparison optical filter；The infrared detector array includes multiple infrared acquisitions
Device, it is one-to-one with detection optical filter, comparison optical filter respectively；After infrared light supply is emitted wide range infrared light, pass through successively
It is emitted after optics gas chamber, infrared Filter Array, into infrared detector array.
Further, infrared Filter Array includes methane gas infrared fileter, carbon dioxide gas infrared fileter, one
Carbonoxide infrared fileter and comparison optical filter；The infrared detector array includes methane gas detector, carbon dioxide gas
Bulk detector, carbon monoxide gas detector and comparison detector.
Further, infrared detector array is centrosymmetric structure；Each infrared detector uses platinum resistance array, each
Platinum resistance array includes four wheatstone bridge circuits.
Further, the cavity inner wall of each infrared detector is equipped with black matrix material coating.
Further, optics gas chamber is in quadrangular frustum pyramid shaped.
Further, the cavity inner wall of optics gas chamber uses insulation and thermal insulation material, and inner wall is equipped with gold-plated reflective layer；It is described
Infrared light supply uses column light source, and exiting infrared light is vertical with the gold-plated reflective layer at the optics gas chamber head end inner wall.
Further, it is equipped with filter screen at air admission hole and venthole.
The utility model additionally provides a kind of non-dispersive infrared gas sensor detecting system using above-mentioned sensing probe,
The non-dispersive infrared gas sensor detecting system further includes microcontroller, pulsqe distributor and multigroup control process unit；Each group
Control process unit is corresponded with each group platinum resistance array respectively；The each group control process unit include amplifying circuit,
Filter circuit, ADC converters；The control terminal of the microcontroller is connected with pulsqe distributor；Each group platinum resistance array respectively with institute
Pulsqe distributor is stated to be connected, and respectively by after the amplifying circuit, filter circuit and ADC converters of corresponding control process unit with
The input terminal of microcontroller is connected.Each group platinum resistance array is quickly continuously switched on the weak voltage of generation by pulsqe distributor successively
Signal is converted to digital signal after the amplifying circuit of corresponding control process unit, filter circuit and ADC converters successively, defeated
It send to microcontroller.
Further, the utility model non-dispersive infrared gas sensor detecting system further includes wireless communication module, hand
Machine；The microcontroller is connect by the wireless communication module with mobile communication.
The utility model has the following advantages compared with prior art：
1, the utility model can be carried out at the same time multiple gases concentration using infrared Filter Array and infrared detector array
Measurement, while the single used can also eliminate sensor other than helping to eliminate the influence that brings of temperature drift
The influence that characteristic drift is brought, at low cost, detection reference integration, coincidence senser miniaturization, Intelligent Developing Trends.
2, the utility model uses the optics gas chamber of truncated rectangular pyramids shape, increases light path, improves transducer sensitivity.
3 at the same infrared detector use array wheatstone bridge circuits, high certainty of measurement, integration degree is high.
Description of the drawings
Fig. 1 is the structural schematic diagram of the utility model sensing probe；
Fig. 2 is the transverse sectional view of sensing probe in Fig. 1；
Fig. 3 is the structural schematic diagram for the platinum resistance array for forming infrared detector array；
Fig. 4 is the circuit diagram of infrared detector array in Fig. 1.
In figure, 1- infrared light supplies, 2- infrared light supply mounting holes, 3- truncated rectangular pyramids optics gas chambers, 4- infrared filtering chip arrays, 5-
Infrared detector array mounting hole, 6- infrared detector arrays, 7- light source reflectings surface, 8- filter screens, 9- optical cavity madial walls,
10- air inlets, the gas outlets 11-, 12- platinum resistance arrays, 13- control process units.
Specific implementation mode
The utility model is further described below in conjunction with the accompanying drawings.Following embodiment is only used for clearly illustrating this
The technical solution of utility model, and the scope of protection of the utility model cannot be limited with this.
The utility model proposes a kind of more gas non-dispersive infrared sensor detecting systems, including sequentially connected sensitive spy
Head, unit machine and control process unit.
As shown in Figure 1, Figure 2, sensing probe include infrared light supply 1, truncated rectangular pyramids optics gas chamber 3, multiple gases it is infrared
Filter arrays 4 and infrared detector array 6.Infrared light supply mounting hole 2 and infrared detector array mounting hole 5 are respectively arranged on
The head end of truncated rectangular pyramids optics gas chamber 3 and tail portion.9 insulation and thermal insulation of optical cavity madial wall and be equipped with gold-plated reflective layer so that it is to be measured
Gas carries out multiple reflections in gas chamber, fully absorbs the infrared light of its infrared absorption peak wave band, wherein truncated rectangular pyramids optics gas chamber 3
It equipped with air admission hole 10 and venthole 11, is communicated under test gas environment by air inlet/outlet, air inlet/outlet is equipped with filter screen 8, prevents
Sealing, dust are attached to its inner wall into the optical cavity, influence infrared light reflection effect.Infrared light supply 1 is installed on infrared
In light source mounting hole 2, and with light source reflecting surface 7（The gold-plated reflective layer plane being located at 3 head end of truncated rectangular pyramids optics gas chamber）It hangs down
Directly, under light source driving circuit driving, to external radiation wide range infrared light, wave-length coverage exists, meet instrument to infrared
The needs of optical wavelength range.Infrared light supply mounting hole 2 is mounted on the top of gas chamber, and infrared filtering chip arrays 4 are mounted on gas chamber
Bottom, including four optical filters, wherein 3 optical filters are detection optical filter, another is comparison optical filter, has chosen methane gas
3.33 μm of the infrared absorption peak of body, has chosen the infrared of carbon monoxide at 4.26 μm of infrared absorption peak for having chosen carbon dioxide
4.65 μm of absorption peak and have chosen 3.95 μm of a reference signal wavelength.Infrared detector battle array is connect under infrared filtering chip arrays 4
Row 6, including with 4 one-to-one methane gas detector of infrared filtering chip arrays, carbon dioxide gas bulk detector, carbon monoxide
Gas detector and comparison detector.Infrared detector array 6 is installed in infrared detector array mounting hole 5, for detecting
Exiting infrared light light intensity, array are centrosymmetric structure, ensure the accuracy measured.What infrared detector array 6 detected goes out
Infrared light light intensity signal is penetrated to be further processed through control process unit.
As shown in Figure 3 and Figure 4, the infrared detector array 6 is made of four groups of platinum resistance arrays 12, the platinum resistance battle array
12 place infrared detector cavity inner wall of row is coated with black matrix material, increases the absorption efficiency of emergent light so that the resistance value of platinum resistance
Change bigger.Every group includes four wheatstone bridge circuits, and wherein R is the identical conventional, electric-resistance of resistance value, R11, R12, R13,
R14, R21, R22, R23, R24, R31, R32, R33, R34, R41, R42, R43, R44 are the identical platinum resistance of resistance value.Such as Fig. 4
Shown, each group platinum resistance array is corresponding with one group of control process unit respectively, each group control process unit include amplifying circuit,
Filter circuit, ADC converters.When the detecting system works, this four groups of platinum resistance arrays 12 pass through arteries and veins under microcontroller control
Distributor is rushed quickly to be continuously switched on successively, the change of platinum resistance array resistors is converted to weak voltage signals, by amplifying circuit and
Filter circuit is converted to digital signal by ADC converters and is conveyed to microcontroller, and then microcontroller is according to digital signal change
Size detects CH in environment to calculate4、CO2, CO gases concentration, be sent to cell phone application finally by WIFI, simplify circuit
While, improve measurement accuracy.
The above is only the preferred embodiment of the utility model, it is noted that for the common skill of the art
For art personnel, without deviating from the technical principle of the utility model, several improvements and modifications can also be made, these change
The scope of protection of the utility model is also should be regarded as into modification.
Claims (9)
1. a kind of sensing probe for non-dispersive infrared gas sensor, it is characterised in that：The sensing probe includes infrared
Light source, optics gas chamber, infrared Filter Array and infrared detector array；It is respectively equipped with air admission hole and outlet on the optics gas chamber
Hole is communicated by air admission hole and venthole under test gas environment；The infrared light supply is set to the optics gas chamber head end；It is described
Infrared Filter Array and infrared detector array are sequentially arranged in optics gas chamber tail portion；The infrared Filter Array includes multiple
Detect optical filter and a comparison optical filter；The infrared detector array includes multiple infrared detectors, is filtered respectively with detection
Mating plate, comparison optical filter are one-to-one；After infrared light supply is emitted wide range infrared light, pass through optics gas chamber, infrared light successively
It is emitted after chip arrays, into infrared detector array.
2. sensing probe according to claim 1, it is characterised in that：The infrared Filter Array includes that methane gas is infrared
Optical filter, carbon dioxide gas infrared fileter, carbon monoxide infrared fileter and comparison optical filter；The infrared detector battle array
Row include methane gas detector, carbon dioxide gas bulk detector, carbon monoxide gas detector and comparison detector.
3. sensing probe according to claim 1 or 2, it is characterised in that：The infrared detector array is centrosymmetric
Structure；It includes four wheatstone bridge circuits that each infrared detector, which uses platinum resistance array, each platinum resistance array,.
4. sensing probe according to claim 3, it is characterised in that：The cavity inner wall of each infrared detector is equipped with black matrix material
Expect coating.
5. sensing probe according to claim 1 or 2, it is characterised in that：The optics gas chamber is in quadrangular frustum pyramid shaped.
6. sensing probe according to claim 1 or 2, it is characterised in that：The cavity inner wall of the optics gas chamber is using exhausted
Edge heat-insulating material, and inner wall is equipped with gold-plated reflective layer；The infrared light supply uses column light source, and exiting infrared light and the light
The gold-plated reflective layer learned at gas chamber head end inner wall is vertical.
7. sensing probe according to claim 1, it is characterised in that：Filter screen is equipped at the air admission hole and venthole.
8. a kind of non-dispersive infrared gas sensor detecting system using any sensing probe of claim 1 to 7, special
Sign is：The non-dispersive infrared gas sensor detecting system further includes microcontroller, pulsqe distributor and multigroup control process
Unit；Each group control process unit is corresponded with each group platinum resistance array respectively；The each group control process unit includes
Amplifying circuit, filter circuit, ADC converters；The control terminal of the microcontroller is connected with pulsqe distributor；The each group platinum resistance
Array is connected with the pulsqe distributor respectively, and respectively by the amplifying circuit of corresponding control process unit, filter circuit and
It is connected with the input terminal of microcontroller after ADC converters.
9. non-dispersive infrared gas sensor detecting system according to claim 8, it is characterised in that：It is described non-spectral red
Outer gas sensor detecting system further includes wireless communication module, mobile phone；The microcontroller by the wireless communication module with
Mobile communication connects.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820339812.2U CN207937352U (en) | 2018-03-13 | 2018-03-13 | A kind of sensing probe and non-dispersive infrared gas sensor detecting system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201820339812.2U CN207937352U (en) | 2018-03-13 | 2018-03-13 | A kind of sensing probe and non-dispersive infrared gas sensor detecting system |
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| CN207937352U true CN207937352U (en) | 2018-10-02 |
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| CN201820339812.2U Expired - Fee Related CN207937352U (en) | 2018-03-13 | 2018-03-13 | A kind of sensing probe and non-dispersive infrared gas sensor detecting system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108489924A (en) * | 2018-03-13 | 2018-09-04 | 南京信息工程大学 | A kind of sensing probe and non-dispersive infrared gas sensor detecting system |
| CN111257268A (en) * | 2020-03-23 | 2020-06-09 | 京东方科技集团股份有限公司 | Infrared filtering device, preparation method thereof and infrared gas sensor |
-
2018
- 2018-03-13 CN CN201820339812.2U patent/CN207937352U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108489924A (en) * | 2018-03-13 | 2018-09-04 | 南京信息工程大学 | A kind of sensing probe and non-dispersive infrared gas sensor detecting system |
| CN111257268A (en) * | 2020-03-23 | 2020-06-09 | 京东方科技集团股份有限公司 | Infrared filtering device, preparation method thereof and infrared gas sensor |
| CN111257268B (en) * | 2020-03-23 | 2023-11-28 | 京东方科技集团股份有限公司 | Infrared filter device, manufacturing method thereof and infrared gas sensor |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20181002 Termination date: 20200313 |