CN107192685A - The measuring method of infrared gas sensor and infrared gas sensor - Google Patents
The measuring method of infrared gas sensor and infrared gas sensor Download PDFInfo
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- CN107192685A CN107192685A CN201610146490.5A CN201610146490A CN107192685A CN 107192685 A CN107192685 A CN 107192685A CN 201610146490 A CN201610146490 A CN 201610146490A CN 107192685 A CN107192685 A CN 107192685A
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- 238000000034 method Methods 0.000 title claims description 11
- 238000005259 measurement Methods 0.000 claims abstract description 19
- 239000000523 sample Substances 0.000 claims abstract description 14
- 230000003287 optical effect Effects 0.000 claims abstract description 12
- 238000012360 testing method Methods 0.000 claims description 14
- 239000000758 substrate Substances 0.000 claims description 10
- 230000005611 electricity Effects 0.000 claims description 8
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 230000003321 amplification Effects 0.000 claims description 2
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 2
- 238000009434 installation Methods 0.000 claims 1
- 238000001514 detection method Methods 0.000 abstract description 9
- 238000001745 non-dispersive infrared spectroscopy Methods 0.000 abstract 2
- 238000010586 diagram Methods 0.000 description 5
- 238000010521 absorption reaction Methods 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- 230000001953 sensory effect Effects 0.000 description 3
- 238000001816 cooling Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 241000208340 Araliaceae Species 0.000 description 1
- 241000196324 Embryophyta Species 0.000 description 1
- 235000005035 Panax pseudoginseng ssp. pseudoginseng Nutrition 0.000 description 1
- 235000003140 Panax quinquefolius Nutrition 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 235000008434 ginseng Nutrition 0.000 description 1
- 229910052736 halogen Inorganic materials 0.000 description 1
- 150000002367 halogens Chemical class 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 229910001120 nichrome Inorganic materials 0.000 description 1
- 230000005616 pyroelectricity Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/35—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
- G01N21/3504—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light for analysing gases, e.g. multi-gas analysis
Abstract
End of probe, the infrared light supply positioned at the source ends, optical filter and infrared detector positioned at the end of probe, the circuit system being electrically connected with the infrared light supply and the infrared detector of gas chamber's other end are located opposite from the invention provides a kind of infrared gas sensor, including gas chamber, the source ends positioned at described gas chamber one end and the source ends；The optical filter is located in the middle of the infrared light supply and the infrared detector；The infrared gas sensor also includes the temperature sensor for being arranged at the source ends, and the temperature sensor is electrically connected with the circuit system.The infrared gas sensor of the present invention is by being arranged at the temperature sensors of the source ends, can in real time, the temperature drift of infrared light supply described in monitor, solve current NDIR sensors and can not monitor infrared light supply temperature drift in real time to cause the shortcoming of measurement result null offset, the detection accuracy and resolution ratio of NDIR sensors can be effectively improved.
Description
Technical field
The present invention relates to a kind of infrared gas detection field, more particularly to a kind of Low Drift Temperature NDIR gas
The design of body sensor (NDIR), and the temperature drift of infrared light supply can be shielded to measurement result
The measuring method of the infrared gas sensor of influence.
Background technology
Non-dispersive infrared gas sensing (NDIR) technology is that a kind of precision is high, stability is good, long lifespan
Gas sensing techniques, its principle is to be absorbed to occur when passing through under test gas using the infrared light of specific wavelength
Decay, the concentration of gas, and Beer-Lambert law are gone out according to the light intensity comparing calculation before and after decay：
I=I0·exp(-μCL).Wherein, I is the infrared light intensity that detector is reached when having gas absorption, I0Not have
Light intensity when gas absorbs, C is gas concentration in chamber, and L is chamber length or infrared light light path, μ
For the absorption coefficient of gas.Therefore, NDIR sensors comprise at least the infrared light for being used for producing infrared light
Source, the infrared light in filtering infrared light source are with the infrared light optical filter of outgoing specific wavelength, infrared light in chamber
The gas chamber being inside actually taken up by gas, the infrared detector for detecting infrared luminous intensity and electricity electricity
The parts such as road.
No matter infrared detector uses thermistor, pyroelectricity or thermoelectric pile skill in NDIR sensors
Art, is all to realize infrared acquisition using will be converted into heat energy after infrared Absorption and change its resistance, therefore,
The detection output signal of NDIR sensors is highly susceptible to the influence of environment temperature, i.e. temperature drift.For this
Problem, current primary solutions one are, by reference channel, signal to be carried out into division arithmetic, reduction temperature
The influence of degree；Two be in infrared detector end increase temperature sensor RT, temperature signal is converted into telecommunications
Number, output signal is compensated.However, because infrared light supply is substantially what is produced using heat radiation
Infrared light, its spatial distribution, luminous intensity both depend on radiation temperature, therefore, source ends heat dissipation environment
Change, the fluctuation of input power all the infrared light of light source output can be caused to change, and light source and spy
Often there is a certain distance between survey device, the temperature change of source ends and the temperature change at detector end are difficult reality
It is now synchronous, so as to cause the zero point of output result to drift about.In general, the temperature drift pair of light source part
Temperature drift of the influence much larger than detector end of output result, for high-resolution NDIR sensors, this
Plant phenomenon particularly fatal
In view of this, it is necessary to the measurement side of existing infrared gas sensor and infrared gas sensor
Method is improved, to solve the above problems.
The content of the invention
It is existing for improving it is an object of the invention to provide a kind of Low Drift Temperature non-dispersive infrared gas sensor
The problem of having NDIR sensor detection signals null offset in technology, at the same provide one kind can shield it is red
The measuring method of the infrared gas sensor of influence of the temperature drift of outer light source to measurement result.
For achieving the above object, the invention provides a kind of infrared gas sensor, including air chamber
Room, the source ends positioned at described gas chamber one end and the source ends are located opposite from the air chamber
The end of probe of the room other end, the infrared light supply positioned at the source ends, the optical filter positioned at the end of probe
The circuit system being electrically connected with infrared detector, with the infrared light supply and the infrared detector；
The optical filter is located in the middle of the infrared light supply and the infrared detector；The infrared gas sensor
Also include the temperature sensor for being arranged at the source ends, the temperature sensor and circuit system electricity
Property connection.
As a further improvement on the present invention, the circuit system includes controller, electrical with the controller
The power supply circuit for connecting to power to the infrared light supply, the temperature-compensating electricity being electrically connected with the controller
Road.
As a further improvement on the present invention, the temperature sensor is electrically to connect with the temperature-compensation circuit
The thermistor connect.
As a further improvement on the present invention, the temperature-compensation circuit includes being connected with the temperature sensor
With the resistance measuring circuit and the resistance measuring circuit of the change in resistance for exporting the temperature sensor in real time
The wave filter of output end connection, the operational amplifier being connected with the filter output, and the computing
The multipath A/D converter of amplifier out connection, the signal being connected with the AfD converter output
Processor, the output end of the signal processor is electrically connected with the infrared detector.
As a further improvement on the present invention, the resistance measuring circuit uses bleeder circuit, with a fixation
Bias VcWith a fixed resistance RLMeasurement temperature sensor RTOn partial pressure VT, RT=RL/(1-Vc/VT),
The output signal of the resistance measuring circuit is voltage signal VT。
As a further improvement on the present invention, the infrared gas sensor also includes described infrared to encapsulate
The encapsulating shell of light source, the substrate that the infrared light supply is fixedly mounted.
As a further improvement on the present invention, the temperature sensor is arranged in the encapsulating shell or the temperature
Degree sensor is arranged on the substrate or the temperature sensor is integrated on the infrared light supply.
For achieving the above object, the present invention also provides a kind of measuring method of infrared gas sensor, wraps
Include following steps：S1：Detected by infrared detector and export the light intensity before infrared light is absorbed by under test gas
I0, infrared light absorbed by under test gas after light intensity I；S2：The infrared light supply is detected by temperature sensor
Temperature, and pass through output signal light intensity I of the circuit system to the infrared detector0, light intensity I compensates.
As a further improvement on the present invention, the circuit system of the infrared gas sensor include controller,
The power supply circuit for being electrically connected with to power to the infrared light supply with the controller and controller electricity
Property connection temperature-compensation circuit；The temperature sensor is to be electrically connected with the temperature-compensation circuit
Thermistor；The temperature-compensation circuit includes being connected to export the temperature in real time with the temperature sensor
Spend the resistance measuring circuit of the change in resistance of sensor, be connected with the output end of the resistance measuring circuit
Wave filter, the operational amplifier being connected with the filter output and the operational amplifier output terminal
The multipath A/D converter of connection, the signal processor being connected with the AfD converter output, institute
The output end and the infrared detector for stating signal processor are electrically connected with；The step S2 is specially：
S2.1：Resistance measuring circuit is set, the change in resistance of the temperature sensor is exported in real time；S2.2：It is logical
Wave filter filters the signal of the resistance measuring circuit output, reduces noise；S2.3：Wave filter is defeated
Signal after the noise reduction gone out is amplified using operational amplifier；S2.4：By putting that operational amplifier is exported
Signal input analog-to-digital converter after big carries out analog/digital conversion；S2.5：It will be turned by analog-digital converter
The output signal of infrared detector is compensated in data signal input signal processor after changing.
As a further improvement on the present invention, the step S2.5 is specially：According to infrared light supply and to be measured
The concrete condition of gas, presets when infrared light supply reaches corresponding measuring condition in the controller
Temperature range, only when the temperature of infrared light supply is reached in the temperature range of setting, the infrared-gas is passed
Sensor just exports the light intensity I currently measured0, light intensity I；When the temperature of infrared light supply is not up to the temperature of setting
In degree is interval, then circuit system adjusts voltage supplied according to the real time temperature of infrared light supply, adjusts described infrared
The temperature of light source is reached in the temperature range of setting.
The beneficial effects of the invention are as follows：The infrared gas sensor of the present invention is by being arranged at the source ends
Temperature sensor, can in real time, the temperature drift of infrared light supply described in monitor, realize to red
The real-time monitoring of outer light source luminance, infrared light supply can not be monitored in real time by solving current NDIR sensors
Temperature drift causes the shortcoming of measurement result null offset, can effectively improve the detection essence of NDIR sensors
Degree and resolution ratio, have application prospect in NDIR sensory fields.
Brief description of the drawings
Fig. 1 is the basic structure schematic diagram of existing NDIR sensors.
Fig. 2 is the overall structure diagram of the infrared gas sensor of the present invention.
Fig. 3 is the basic structure schematic diagram of the source ends of the infrared gas sensor shown in Fig. 2.
Fig. 4 is the light-source temperature feedback arrangement schematic diagram of the source ends shown in Fig. 3.
Embodiment
In order that the object, technical solutions and advantages of the present invention are clearer, below in conjunction with the accompanying drawings and specifically
The present invention will be described in detail for embodiment.
Refer to shown in Fig. 2~Fig. 4, be that the structure of the infrared gas sensor of present pre-ferred embodiments is shown
It is intended to；Wherein Fig. 2 structure label is referred to shown in Fig. 1.It should be noted that institute in the present embodiment
The diagram of offer only illustrates the basic conception of the present invention in a schematic way, only display and the present invention in schema then
In relevant component rather than drawn according to component count, shape and the size during actual implement, it is actual real
The kenel of each component, quantity and ratio can be a kind of random change, and its assembly layout kenel when applying
It is likely more complexity.
Refer to shown in Fig. 2, the infrared gas sensor is actually taken up by gas including infrared light in chamber
Gas chamber 2, the source ends 1 positioned at described one end of gas chamber 2, with the source ends 1 relatively
End of probe 3 positioned at the other end of gas chamber 2, positioned at the source ends 1 to produce infrared light
Infrared light supply 8, be arranged at the temperature sensor 10 of the source ends 1, positioned at the mistake of end of probe 3
Infrared light supply 8 is filtered with the optical filter 6 and 7 of the infrared light of outgoing specific wavelength, positioned at the end of probe 3
Infrared detector 4 and 5 and circuit system 15 to detect infrared luminous intensity；The infrared light supply 8,
The temperature sensor 10, the infrared detector 4 and 5 are electrically connected with the circuit system 15.
It will be appreciated by persons skilled in the art that above-mentioned " source ends 1 and the end of probe 3 phase
It is located at the two ends of the gas chamber 2 over the ground " not refer in particular to 3 points of the source ends 1 and the end of probe
Not Wei Yu the gas chamber 2 locus two ends, but the source ends 1 and the end of probe
3 are located at the two ends of the incident light path of infrared light respectively.
Specifically, the infrared light supply 8 can be incandescent lamp, Halogen lamp LED, nichrome wire, globar,
One kind in the light sources such as MEMS infrared light supplies；The infrared light supply 8 has to be connected with circuit system 15
Two the first pins.
Further, refer to shown in Fig. 3, Fig. 4, the infrared gas sensor also includes to seal
Fill the encapsulating shell (not shown) of the infrared light supply 8, the substrate 9 of the infrared light supply 8 is fixedly mounted.
The substrate 9, which is provided with, is respectively connecting to two first pins two first of the circuit system 15
Lead；After the infrared light supply 8 is installed on the substrate 9, first pin passes through the first lead
It is connected in circuit system 15.
It will be appreciated by persons skilled in the art that the temperature change of the infrared light supply 8 is mainly derived from
Input power is fluctuated and external cooling environmental change.Wherein, input power fluctuating factor is usually in NDIR
Monitored in real time by circuit realiration in sensor；External cooling environmental change mostlys come from NDIR sensings
Mechanical structure heat transfer, variation of ambient temperature, air velocity change for being connected in device with infrared light supply 8 etc..
By setting temperature sensor 10 in the source ends 1, can in real time, infrared light described in monitor
The temperature drift in source 8, realizes the real-time monitoring to the luminance of infrared light supply 8, solves current NDIR
Sensor, which can not monitor the temperature drift of infrared light supply 8 in real time, causes the shortcoming of measurement result null offset, can
The detection accuracy and resolution ratio of NDIR sensors are effectively improved, has application prospect in NDIR sensory fields.
In the present embodiment, the temperature sensor 10 is thermistor RT, it is arranged in the encapsulating shell
Or the temperature sensor 10 is arranged on the substrate 9, the infrared light supply 8 can be closely detected
Temperature；Because the temperature sensor 10 is closer to the distance with the infrared light supply 8, and input power
It can control, therefore the temperature detected by the temperature sensor 10 and the temperature of itself of infrared light supply 8
Degree is basically identical, can regard the temperature of the infrared light supply 8.Certainly in other examples, the temperature
Degree sensor 10 can also be integrated in the infrared light supply 8, when the temperature of infrared light supply 8 changes,
It is shorter that temperature sensor 10 and the infrared light supply 8 set up corresponding heat balance time, can be prevented effectively from temperature
The hysteresis effect of sensor 10 is spent, so as to improve the stability and precision of the infrared gas sensor.
The temperature sensor 10 has two second pins being connected with circuit system 15；The substrate
9 provided with two the second leads that two second pins are respectively connecting to the circuit system 15；Institute
State after temperature sensor 10 is installed on the substrate 9, the second pin is connected to by the second lead
In circuit system 15.
The gas chamber 2 has the air inlet circulated under test gas and gas outlet.The source ends 1
Positioned at one end provided with the air inlet, the end of probe 3 is located at one end provided with the gas outlet；And
The air inlet and the gas outlet are located in the middle of the source ends 1 and the end of probe 3.
The optical filter 6 and 7 is located in the middle of the infrared light supply 8 and the infrared detector 4 and 5；
The infrared light that the infrared light supply 8 is sent is absorbed by gas chamber 2 by under test gas, then by filtering
After piece 6 and 7 reach infrared detector 4 and 5, by contrast infrared light by under test gas absorb before and after
Light intensity calculates under test gas concentration.
Refer to shown in Fig. 2, in the present embodiment, the infrared gas sensor has Measurement channel and ginseng
Than passage, the measurement that the optical filter 6 and 7 includes connecting with Measurement channel, reference channel respectively filters
Piece 6, reference optical filter 7；The infrared detector 4 and 5 include respectively with Measurement channel, reference channel
Measurement infrared detector 4, the reference infrared detector 5 of connection.Set by double optical channels, shield ring
The influence to measurement result such as border factor, improves the accuracy of measurement.
Refer to shown in Fig. 4, the circuit system 15 includes controller, electrically connected with the controller
The power supply circuit for connecing to power to the infrared light supply 8, the temperature-compensating being electrically connected with the controller
Circuit.The temperature-compensation circuit can be according to the temperature change of the infrared light supply 8 to the infrared spy
Survey device 4 and 5 output signal compensate so that substantially reduce because the temperature drift of infrared light supply 8 bring it is defeated
Go out signal zero drift, the detection resolution of NDIR sensors is improved, in NDIR field of gas detection
In have application prospect.
Specifically, the temperature sensor 10 is the temperature-sensitive electricity being electrically connected with the temperature-compensation circuit
Hinder RT；The temperature-compensation circuit includes being connected to export the temperature in real time with the temperature sensor 10
Spend the resistance measuring circuit of the change in resistance of sensor 10, be connected with the output end of the resistance measuring circuit
Wave filter 11, be connected with the output end of wave filter 11 operational amplifier 12, put with the computing
The multipath A/D converter 13 and the output end of analog-digital converter 13 of the big output end of device 12 connection connect
The signal processor 14 connect, the output end of the signal processor 14 and the infrared detector 4 and 5
It is electrically connected with to control the output signal of infrared detector 4 and 5.
The resistance measuring circuit uses bleeder circuit, with a fixed-bias transistor circuit VcWith a fixed resistance
RLPartial pressure V on measurement temperature sensor 10T, RT=RL/(1-Vc/VT), the resistance measuring circuit
Output signal is voltage signal VT。
For achieving the above object, the present invention also provides a kind of survey for above-mentioned infrared gas sensor
Amount method, comprises the following steps：
S1：Detected by infrared detector 4 and 5 and export the light intensity I before infrared light is absorbed by under test gas0、
Infrared light absorbed by under test gas after light intensity I；Concentration for calculating under test gas.
S2：The temperature of the infrared light supply 8 is detected by temperature sensor 10, and passes through circuit system
The output signal light intensity I of 15 pairs of infrared detectors 4 and 50, light intensity I compensate, it is red to shield
Influence of the temperature drift of outer light source 8 to measurement accuracy.
Further, the step S2 is specially：
S2.1：The resistance measuring circuit is set, the change in resistance of the temperature sensor 10 is exported in real time；
S2.2：The signal that the resistance measuring circuit is exported is filtered by wave filter 11, noise is reduced；
S2.3：Signal after the noise reduction that wave filter 11 is exported is amplified using operational amplifier 12；
S2.4：Signal input analog-to-digital converter 13 after the amplification that operational amplifier 12 is exported carries out mould
Plan/numeral conversion；
S2.5：Will be right in the data signal input signal processor 14 after being changed by analog-digital converter 13
The output signal of infrared detector 4 and 5 is compensated.
Further, the S2.5 steps are specially：According to infrared light supply 8 and the specific feelings of under test gas
Condition, presets temperature range when infrared light supply 8 reaches corresponding measuring condition in the controller,
Only when the temperature of infrared light supply 8 is reached in the temperature range of setting, the infrared gas sensor is just defeated
Go out current measured value；If the temperature of infrared light supply 8 is not up in the temperature range of setting, circuit
System 15 adjusts voltage supplied according to the real time temperature of infrared light supply 8, adjusts the temperature of the infrared light supply 8
In the temperature range for reaching setting.
In summary, the infrared gas sensor detects the temperature of infrared light supply 8 by being provided for
Temperature sensor 10, can in real time, the temperature drift of infrared light supply 8 described in monitor, realize
Real-time monitoring to the luminance of infrared light supply 8, solving current NDIR sensors can not monitor red in real time
The temperature drift of outer light source 8 causes the shortcoming of measurement result null offset, can effectively improve NDIR sensors
Detection accuracy and resolution ratio, have application prospect in NDIR sensory fields.
The above embodiments are merely illustrative of the technical solutions of the present invention and it is unrestricted, although with reference to preferable implementation
The present invention is described in detail example, it will be understood by those within the art that, can be to this hair
Bright technical scheme is modified or equivalent substitution, without departing from the spirit and model of technical solution of the present invention
Enclose.
It is any related " the present embodiment " in this specification, it is meant that one relevant with embodiment is specific
Function, structure or characteristic description comprising the present invention at least one embodiment.These appear in explanation
Each local phrase of book not necessarily refers to identical embodiment.Further, it is related to any embodiment
Specific function, structure or detailed description, then it is assumed that be to implement in the range of the art with other
Example related function, structure or characteristic.
Claims (10)
1. a kind of infrared gas sensor, including gas chamber, the source ends positioned at described gas chamber one end,
The end of probe of gas chamber's other end is located opposite from the source ends, positioned at the red of the source ends
Outer light source, optical filter and infrared detector positioned at the end of probe, with the infrared light supply with it is described infrared
The circuit system that detector is electrically connected with；The optical filter is located at the infrared light supply and the infrared acquisition
In the middle of device；It is characterized in that：The temperature that the infrared gas sensor also includes being arranged at the source ends is passed
Sensor, the temperature sensor is electrically connected with the circuit system.
2. infrared gas sensor according to claim 1, it is characterised in that：The circuit system bag
Include controller, with the controller be electrically connected with powered to the infrared light supply power supply circuit, with it is described
The temperature-compensation circuit that controller is electrically connected with.
3. infrared gas sensor according to claim 2, it is characterised in that：The temperature sensor
For the thermistor being electrically connected with the temperature-compensation circuit.
4. infrared gas sensor according to claim 3, it is characterised in that：The temperature-compensating electricity
Road includes being connected with the temperature sensor to be surveyed with the resistance for the change in resistance for exporting the temperature sensor in real time
Amount circuit, the wave filter being connected with the output end of the resistance measuring circuit and the filter output connect
The operational amplifier that connects, the multipath A/D converter being connected with the operational amplifier output terminal, with it is described
The signal processor of AfD converter output connection, the output end of the signal processor and the infrared spy
Device is surveyed to be electrically connected with.
5. infrared gas sensor according to claim 4, it is characterised in that：The resistance measurement electricity
Road uses bleeder circuit, with a fixed-bias transistor circuit VcWith a fixed resistance RLMeasurement temperature sensor RTOn
Partial pressure VT, RT=RL/(1-Vc/VT), the output signal of the resistance measuring circuit is voltage signal VT。
6. infrared gas sensor according to claim 1, it is characterised in that：The infrared-gas is passed
Sensor also includes encapsulating shell, the substrate of the fixed installation infrared light supply to encapsulate the infrared light supply.
7. infrared gas sensor according to claim 6, it is characterised in that：The temperature sensor
It is arranged in the encapsulating shell or the temperature sensor is arranged on the substrate or the temperature sensor collection
Described in Cheng Yu on infrared light supply.
8. a kind of measuring method of infrared gas sensor for described in claim 1, comprises the following steps：
S1：Detected by infrared detector and export the light intensity I before infrared light is absorbed by under test gas0, infrared light
Light intensity I after being absorbed by under test gas；
S2：The temperature of the infrared light supply is detected by temperature sensor, and by circuit system to described red
The output signal light intensity I of external detector0, light intensity I compensates.
9. the measuring method of infrared gas sensor according to claim 8, it is characterised in that：
The circuit system of the infrared gas sensor includes controller, is electrically connected with the controller with to institute
State the power supply circuit that infrared light supply is powered, the temperature-compensation circuit being electrically connected with the controller；It is described
Temperature sensor is the thermistor being electrically connected with the temperature-compensation circuit；The temperature-compensation circuit
Surveyed including being connected with the temperature sensor with the resistance for the change in resistance for exporting the temperature sensor in real time
Amount circuit, the wave filter being connected with the output end of the resistance measuring circuit and the filter output
The operational amplifier of connection, the multipath A/D converter being connected with the operational amplifier output terminal, with
The signal processor of AfD converter output connection, the output end of the signal processor with it is described
Infrared detector is electrically connected with；The step S2 is specially：
S2.1：Resistance measuring circuit is set, the change in resistance of the temperature sensor is exported in real time；
S2.2：The signal exported by resistance measuring circuit described in filters filter, reduces noise；
S2.3：Signal after the noise reduction that wave filter is exported is amplified using operational amplifier；
S2.4：Signal input analog-to-digital converter after the amplification that operational amplifier is exported carries out analog/digital
Conversion；
S2.5：To infrared spy in data signal input signal processor after being changed by analog-digital converter
The output signal for surveying device is compensated.
10. the measuring method of infrared gas sensor according to claim 9, it is characterised in that：
The step S2.5 is specially：According to infrared light supply and the concrete condition of under test gas, in the controller
Inside preset temperature range when infrared light supply reaches corresponding measuring condition, the only temperature when infrared light supply
When reaching in the temperature range of setting, the infrared gas sensor just exports the light intensity I currently measured0、
Light intensity I；When the temperature of infrared light supply is not up in the temperature range of setting, then circuit system is according to infrared
The real time temperature regulation voltage supplied of light source, the temperature for adjusting the infrared light supply reaches the temperature range of setting
It is interior.
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| CN201610146490.5A CN107192685A (en) | 2016-03-15 | 2016-03-15 | The measuring method of infrared gas sensor and infrared gas sensor |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108709868A (en) * | 2018-08-17 | 2018-10-26 | 青岛海纳光电环保有限公司 | A kind of infrared gas sensor and infrared gas detection device |
| CN110411581A (en) * | 2019-08-06 | 2019-11-05 | 电子科技大学 | A kind of multichannel NDIR gas analysis system based on pyroelectric electric device |
| CN111208083A (en) * | 2020-02-18 | 2020-05-29 | 苏州诺联芯电子科技有限公司 | Infrared gas sensor |
| CN113484268A (en) * | 2021-07-29 | 2021-10-08 | 天地（常州）自动化股份有限公司 | Infrared carbon dioxide sensor measuring system and temperature compensation method thereof |
| CN114965341A (en) * | 2022-07-01 | 2022-08-30 | 安徽农业大学 | Multipoint constant-temperature infrared gas detection system and method for reducing temperature drift influence |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108709868A (en) * | 2018-08-17 | 2018-10-26 | 青岛海纳光电环保有限公司 | A kind of infrared gas sensor and infrared gas detection device |
| CN110411581A (en) * | 2019-08-06 | 2019-11-05 | 电子科技大学 | A kind of multichannel NDIR gas analysis system based on pyroelectric electric device |
| CN111208083A (en) * | 2020-02-18 | 2020-05-29 | 苏州诺联芯电子科技有限公司 | Infrared gas sensor |
| CN113484268A (en) * | 2021-07-29 | 2021-10-08 | 天地（常州）自动化股份有限公司 | Infrared carbon dioxide sensor measuring system and temperature compensation method thereof |
| CN114965341A (en) * | 2022-07-01 | 2022-08-30 | 安徽农业大学 | Multipoint constant-temperature infrared gas detection system and method for reducing temperature drift influence |
| CN114965341B (en) * | 2022-07-01 | 2024-04-12 | 安徽农业大学 | Multi-point constant-temperature infrared gas detection system and method for reducing temperature drift influence |
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