CN108982396A - A kind of infrared CO2Gas sensor and its calibration system and humiture compensation method - Google Patents
A kind of infrared CO2Gas sensor and its calibration system and humiture compensation method Download PDFInfo
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- CN108982396A CN108982396A CN201810538597.3A CN201810538597A CN108982396A CN 108982396 A CN108982396 A CN 108982396A CN 201810538597 A CN201810538597 A CN 201810538597A CN 108982396 A CN108982396 A CN 108982396A
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- 230000003287 optical effect Effects 0.000 claims abstract description 15
- 238000012937 correction Methods 0.000 claims abstract description 6
- 238000013528 artificial neural network Methods 0.000 claims abstract description 5
- 230000002068 genetic effect Effects 0.000 claims abstract description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 23
- 238000010438 heat treatment Methods 0.000 claims description 11
- 230000001276 controlling effect Effects 0.000 claims description 9
- 238000001514 detection method Methods 0.000 claims description 9
- 238000002474 experimental method Methods 0.000 claims description 9
- 230000003321 amplification Effects 0.000 claims description 6
- 238000006243 chemical reaction Methods 0.000 claims description 6
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 6
- 230000001105 regulatory effect Effects 0.000 claims description 6
- 230000006698 induction Effects 0.000 claims description 5
- 238000002955 isolation Methods 0.000 claims description 4
- 229910052739 hydrogen Inorganic materials 0.000 claims description 3
- 230000001678 irradiating effect Effects 0.000 claims description 3
- 230000013011 mating Effects 0.000 claims description 3
- 230000005611 electricity Effects 0.000 claims description 2
- 230000004927 fusion Effects 0.000 claims description 2
- 230000003447 ipsilateral effect Effects 0.000 claims description 2
- 230000006837 decompression Effects 0.000 claims 1
- 238000002347 injection Methods 0.000 claims 1
- 239000007924 injection Substances 0.000 claims 1
- 238000005259 measurement Methods 0.000 abstract description 9
- 238000002156 mixing Methods 0.000 abstract description 3
- 229910002092 carbon dioxide Inorganic materials 0.000 description 30
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 6
- 238000010521 absorption reaction Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 239000001569 carbon dioxide Substances 0.000 description 2
- 238000002329 infrared spectrum Methods 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- FGRBYDKOBBBPOI-UHFFFAOYSA-N 10,10-dioxo-2-[4-(N-phenylanilino)phenyl]thioxanthen-9-one Chemical compound O=C1c2ccccc2S(=O)(=O)c2ccc(cc12)-c1ccc(cc1)N(c1ccccc1)c1ccccc1 FGRBYDKOBBBPOI-UHFFFAOYSA-N 0.000 description 1
- 238000000862 absorption spectrum Methods 0.000 description 1
- 235000013405 beer Nutrition 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/16—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements
- G01K7/22—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements the element being a non-linear resistance, e.g. thermistor
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
- G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
- G01N33/0027—General constructional details of gas analysers, e.g. portable test equipment concerning the detector
- G01N33/0036—Specially adapted to detect a particular component
- G01N33/004—Specially adapted to detect a particular component for CO, CO2
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2201/00—Features of devices classified in G01N21/00
- G01N2201/02—Mechanical
- G01N2201/023—Controlling conditions in casing
- G01N2201/0238—Moisture monitoring or controlling
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2201/00—Features of devices classified in G01N21/00
- G01N2201/12—Circuits of general importance; Signal processing
- G01N2201/121—Correction signals
- G01N2201/1211—Correction signals for temperature
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2201/00—Features of devices classified in G01N21/00
- G01N2201/12—Circuits of general importance; Signal processing
- G01N2201/121—Correction signals
- G01N2201/1214—Correction signals for humidity
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2201/00—Features of devices classified in G01N21/00
- G01N2201/12—Circuits of general importance; Signal processing
- G01N2201/127—Calibration; base line adjustment; drift compensation
Abstract
The invention discloses a kind of infrared CO2Gas sensor includes sequentially connected hardware circuit, infrared light supply, flat tapered optics gas chamber and the binary channels infrared detector with optical filter.In addition, its calibration system includes sequentially connected standard gas bottle, pressure reducing valve, insulating box, gas-guide tube, humidifier, humidity sensor and infrared CO2Gas sensor；It is long that flat tapered optics gas chamber reduces chamber, and sensor cavity is miniaturized；Using totally enclosed temperature and humidity calibration system device, temperature and humidity and CO in environment are efficiently solved2The interference of concentration bring, calibration result are more accurate；Temperature and humidity error correction is solved the problems, such as using constant temperature and humidity scaling method, improves measurement accuracy and stability；Using based on the improved wavelet neural network of genetic algorithm (GA-WNN) blending algorithm to CO2Gas sensor carries out temperature and humidity error compensation, improves measurement accuracy.
Description
Technical field
The present invention relates to infrared gas sensor field, in particular to a kind of infrared CO2Gas sensor is based on the sensing
The calibration system of device and the humiture compensation method for utilizing the system.
Background technique
Nowadays CO in atmospheric environment2Gas concentration gradually increases, and gives global ecological environment, weather and people's lives band
Carry out many negative effects and therefore real-time and accurately monitors CO2Concentration is extremely urgent.And non-spectral infrared absorption method has
Selectivity it is good, stability is good, measurement range is wide, fast response time and be suitable for on-line checking the advantages that, be increasingly becoming on-line monitoring
CO2The main method of gas concentration.But due to indoor and outdoor CO2Gas concentration is very small and fluctuation is atomic weak, and ambient temperature and humidity pair
Its absorption spectrum have it is certain influence, research shows that: when temperature is in 0~50 DEG C of variation, as the temperature increases, CO2Gas
Infrared spectra adsorption ability is enhanced；When the humidity increases, CO2Gas enhances Infrared spectra adsorption ability.It is infrared at this stage
CO2Gas sensor is low there are measurement sensitivity and can not be well suited in the extreme weather weather the problems such as, must in view of this, having
Existing infrared gas sensor and its calibration system are improved to solve the above problems.
Summary of the invention
The present invention is in order to solve infrared CO in the prior art2Detector sensitivity is low, and accuracy is not high, can not be well suited
In the extreme weather weather the problems such as, a kind of infrared CO is proposed2Gas sensor, the calibration system based on the sensor and utilization should
The humiture compensation method of system, the CO that calibration system generates2Gas thermostatic constant humidity, sensor have flat tapered cavity knot
Structure, miniaturization is at low cost, and effectively eliminates temperature and humidity using a kind of temperature and humidity correction algorithm and detect bring shadow to concentration
It rings, market application value is big.
In order to solve the above technical problems, the present invention provides a kind of infrared CO2Gas sensor, including it is sequentially connected red
Outer light source, optics gas chamber, infrared detector, light source driving circuit, micro- from driving infrared light supply to optics gas chamber irradiating infrared light
Processor, signal amplification circuit, A/D conversion circuit and telecommunication circuit, light source driving circuit drive under control of the microprocessor
Infrared light supply passes through optics gas chamber and is projected by infrared detector to optics gas chamber irradiating infrared light, infrared light, infrared detector
It converts optical signals to electric signal and successively obtains detectable signal, the detection by signal amplification circuit and A/D conversion circuit
Signal, which is sent to microprocessor, to carry out processing and is exported by telecommunication circuit.
The cavity of the optics gas chamber is that flat tapered structure includes oblate end and round nose, the optics gas chamber inside cavities
Wall is equipped with gold-plated reflective layer, and the oblateness end is equipped with the infrared light supply mounting hole for installing infrared light supply, the round nose
Equipped with the infrared detector mounting hole for installing infrared detector, air inlet, the round nose are equipped at the oblateness end
Place is equipped with gas outlet, which is located at not ipsilateral.
The infrared detector is the binary channels infrared detector with optical filter, which is equipped with the sense of two-way light intensity
Answering channel includes detection channels and reference channel, and is equipped with the optical filtering of different model at the induction window of induction channels respectively
Piece respectively detects optical filter and refers to optical filter, and the infrared detector is built-in with thermistor.
The invention also discloses one kind to be based on infrared CO2The calibration system of gas sensor, including sequentially connected standard gas
Bottle, pressure reducing valve, insulating box, gas-guide tube, humidifier, humidity sensor and infrared CO2Gas sensor, the gas-guide tube, humidification
Device, humidity sensor and infrared CO2Gas sensor is placed in insulating box.
The humidifier is from top to bottom successively including sink, for heating the water in the sink to generate adding for vapor
Backing, single chip machine controlling circuit, the supplying cell for powering to humidifier, reservoir and for supplying cell and water storage to be isolated
The isolation board in pond, the reservoir are that sink supplies water by water pump and water pipe, the single chip machine controlling circuit and heating sheet, water pump,
Humidity sensor connection, further includes the spin button for different humidity to be arranged, the spin button and single chip machine controlling circuit phase
Even.
Utilize the humiture compensation method of above-mentioned calibration system, comprising the following steps:
Step 1: opening infrared CO2Gas sensor, detect its whether steady operation；
Step 2: by the standard gas bottle CO of calibration system2The standard density concentration CKIt is set as C1, valve is opened, detects whether to leak
Gas；
Step 3: setting humidifier humidity H as H1, 30%≤H1≤ 90%；
Step 4: opening insulating box, regulating thermostatic box temperature degree T is T1；
Step 5: waiting up to gas-guide tube is interior and infrared CO2Gas sensor interior constant temperature and humidity；
Step 6: opening pressure reducing valve, CO2Gas enters infrared CO by gas-guide tube2Gas sensor, until CO2Gas fills
Full infrared CO2Gas sensor records infrared detector reference channel voltage signal Vr, detection channels voltage signal Vm, closing subtracts
Pressure valve；
Step 7: successively regulating thermostatic box temperature degree T is T2、T3、T4、T5, step 4 is repeated to step 6, and experiment terminates to close permanent
Incubator and humidifier；
Step 8: setting humidifier humidity H is respectively H2、H3、H4、H5, 30%≤Hi≤ 90%, i=2,3,4,5, it repeats to walk
Rapid 4 to 7, experiment terminates to close standard gas bottle valve；
Step 9: replacement various concentration standard gas bottle, CO2Concentration is respectively C2、C3、C4、C5, step 2 is repeated to step 8；
Step 10: experiment terminates to close infrared CO2Gas sensor, by humidity H1Temperature T1Lower institute's measured data is according to lambert
Beer law carries out formula inverting, obtains concentration expression formula:
Cr=f (Vr,Vm) (1)
It brings lower the surveyed voltage signal of remaining temperature and humidity into formula, obtains calculating concentration value Cr, the concentration that will be calculated
Value Cr, humidity value H and temperature value T be as fitting function Ck(T,H,Cr) input variable, using based on genetic algorithm improve
Wavelet neural network blending algorithm carry out surface fitting, obtain fitting function:
Ck(T,H,Cr)=f (T, H, Vr,Vm) (2)
Utilize the CO2Gas concentration correction function carries out real-time compensation amendment.
The utility model has the advantages that compared with prior art, the present invention the invention has the following advantages that
(1) totally enclosed calibration system is used, temperature and humidity and CO in environment are efficiently solved2The interference of concentration bring,
Calibration result is more accurate.
(2) temperature and humidity error correction is solved the problems, such as using constant temperature and humidity scaling method, improves measurement accuracy and stability.
(3) flat tapered optics gas chamber is used, internal capacity is expanded, it is long to reduce chamber, coincidence senser miniaturization hair
Exhibition trend.
(4) it uses based on the improved wavelet neural network of genetic algorithm (GA-WNN) blending algorithm to CO2Gas sensor
Temperature and humidity error compensation is carried out, measurement accuracy is improved.
Detailed description of the invention
Fig. 1 is the infrared CO of the present invention2Gas sensor configuration schematic diagram
Fig. 2 is optics gas chamber cavity structural schematic diagram of the present invention.
Fig. 3 is calibration system schematic diagram of the present invention.
Fig. 4 is humidifier schematic diagram of internal structure of the present invention.
Fig. 5 is the scaling method flow chart that the present invention solves that temperature and humidity influences.
Fig. 6 is CO of the present invention2Concentration temperature and humidity error compensation curved surface schematic diagram.
Specific embodiment
The present invention is further explained with reference to the accompanying drawing.
As depicted in figs. 1 and 2, infrared CO2Gas sensor includes sequentially connected hardware circuit, infrared light supply, flat cone
Type optics gas chamber and binary channels infrared detector with optical filter.Hardware circuit includes light source driving circuit, signal amplification electricity
Road, A/D conversion circuit, STM32 microprocessor and telecommunication circuit.The light source driving circuit is controlled in STM32 microprocessor
Lower driving infrared light supply to optics gas chamber radiate wide range infrared light, optics gas chamber cavity body structure be it is flat tapered, cavity cone angle is
5 °, oblate end is equipped with infrared light supply mounting hole 1, is used to install infrared light supply, and round nose is equipped with detector mounting hole 4,
For installing detector, cavity inner wall 5 is equipped with gold-plated reflective layer and fills so that under test gas carries out multiple reflections in gas chamber
Divide the infrared light for absorbing its infrared absorption peak wave band, and two sides are respectively equipped with air inlet 2 and gas outlet 3, outside is equipped with for solid
Fixed screw hole 6.Infrared light passes through optics gas chamber, is emitted by the binary channels infrared detector of optical filter, and infrared detector will
The optical signal of outgoing is converted to electric signal, transmits STM32 by signal amplification circuit and A/D conversion circuit, then by detectable signal
It is handled, finally by telecommunication circuit output data.
Infrared light supply is IRL-715, and radiation wavelength contains CO from visible light to 5 μm2Gas characteristic absorption peak, and
Output is stablized, and in 5V operating at voltages, the service life is up to 40000h, meets the requirements, and is installed in infrared light supply mounting hole, in light
Under source driving circuit driving, to external radiation wide range infrared light.
Binary channels infrared detector TPD2T0625 with optical filter, is installed in detector mounting hole, the detector is sensitive
Degree is high, induces window equipped with two-way light intensity, and be equipped with the optical filter of different model, respectively detection optical filter and reference filter
Mating plate, central wavelength are respectively 4.26 μm of the infrared absorption peak and separate carbon dioxide gas absorption peak of carbon dioxide gas
3.95 μm.A built-in thermistor can since temperature is to influence an important factor in order of CO2 measurement of concetration
To provide reference with it come the internal temperature of measurement detector.
As shown in Figure 3 and Figure 4, calibration system includes sequentially connected standard gas bottle 7, pressure reducing valve 8, insulating box 14, gas-guide tube
9, humidifier 10, humidity sensor 12 and infrared CO2Gas sensor 13.Wherein gas-guide tube 9, humidifier 10, humidity sensor
Device 12 and infrared CO2Gas sensor 13 is placed in insulating box 14.Standard gas bottle 7 connects with pressure reducing valve 8 is placed in insulating box
16 outsides, 9 one end of gas-guide tube connect with pressure reducing valve 8, the other end and infrared CO2Gas sensor 13 connects, middle part and humidifier
10 connect.Humidifier 10 includes small sink 15, heating sheet 16, single chip machine controlling circuit 17, supplying cell 19, isolation board 20, stores
Pond 21, water pump 22, water pipe 23 and spin button 18.Its medium and small sink 15 passes through water pipe 23 and water pump 22 and bottom reservoir
21 connect, and divide into heating sheet 16, for heating the water in small sink 15 to generate vapor, are made in hose by gas-guide tube 9
Portion generates moisture；Single chip machine controlling circuit 17 is used to control the running of entire 10 system of humidifier, and heating sheet 16, water pump is inscribed
22, spin button 18, and pass through the external humidity sensor 12 of conducting wire 11；Supplying cell 19 is powered to entire humidifier 10；Isolation
Plate 20 is isolated by supplying cell 19 with reservoir 21；Spin button 18 is for being arranged humidity in hose, equipped with 8 different shelves
Humidity range is arranged from 30%~90% for generating different humidity in position.When humidifier 10 works, spin button is unscrewed
18, humidity value is set, and single chip machine controlling circuit 17 controls water pump 22 and draws water from reservoir 21, injects small sink by water pipe 23
15, while controlling heating sheet 16 and starting to heat to small sink 15, humidity sensor 12 is in real time by the humidity in soft air-guide pipe at this time
Information sends single-chip microcontroller to, when humidity is less than desired level, system worked well, and when humidity is more than or equal to desired level, heating
Piece 16 and water pump 22 stop working, and the water flow in small sink 15 returns reservoir 21, when spin button is screwed onto off grades, humidifier
It stops working.
Humidity sensor is SHT71 digital temperature-humidity sensor, and humidity sensor output is digital signal, with monolithic
Machine is connected.
As shown in figs. 5 and 6, the step of solving the problems, such as temperature and humidity using the calibration system is as follows:
Step 1: infrared CO is opened2Gas sensor switch, wait 30 minutes, detection sensor 13 whether steady operation；
Step 2: it has been sequentially connected each device of temperature and humidity calibration system, at this time the CO of standard gas bottle 72The standard density concentration
CKFor C1, valve is opened, detects whether gas leakage；
Step 3: 10 humidity H of humidifier is set as H1(30%≤H1≤ 90%)；
Step 4: opening insulating box 14, and 14 temperature T of regulating thermostatic case is T1；
Step 5: waiting 30 minutes, up to gas-guide tube 9 is interior and 13 inside constant temperature and humidity of sensor；
Step 6: pressure reducing valve 8, CO is opened2Gas enters sensor 13 by constant temperature and humidity gas-guide tube 9, waits several seconds for, directly
To CO2Gas is full of sensor 13, records detector binary channels reference channel voltage signal Vr, detection channels voltage signal Vm, close
Close pressure reducing valve 8；
Step 7: successively 14 temperature T of regulating thermostatic case is T2、T3、T4、T5, step 4 is repeated to step 6, and experiment terminates
Close insulating box 14 and humidifier 10；
Step 8: setting 10 humidity H of humidifier is respectively H2、H3、H4、H5(30%≤Hi≤ 90%, i=2,3,4,5), weight
To seven, experiment terminates to close 7 valve of standard gas bottle multiple step 4；
Step 9: replacement various concentration standard gas bottle 7, CO2Concentration is respectively C2、C3、C4、C5, step 2 is repeated to step 8；
Step 9: experiment terminates closure sensor 13, by humidity H1Temperature T1Lower institute's measured data according to langbobier law into
Row formula inverting obtains concentration expression formula Cr=f (Vr,Vm), it brings lower the surveyed voltage signal of remaining temperature and humidity into formula, obtains
Calculate concentration value Cr, the concentration value C that will be calculatedr, humidity value H and temperature value T be as Ck(T,H,Cr) input variable.
Surface fitting is carried out using calculating based on the improved wavelet neural network of genetic algorithm (GA-WNN) fusion, obtains fitting function Ck
(T,H,Cr)=f (T, H, Vr,Vm), utilize the CO2Gas concentration correction function carries out real-time compensation amendment, improves measurement accuracy.
Claims (6)
1. a kind of infrared CO2Gas sensor, it is characterised in that: including sequentially connected infrared light supply, optics gas chamber, infrared spy
It surveys device, drive infrared light supply to the light source driving circuit of optics gas chamber irradiating infrared light, microprocessor, signal amplification circuit, A/D
Conversion circuit and telecommunication circuit, it is red that light source driving circuit drives infrared light supply to radiate to optics gas chamber under control of the microprocessor
Outer light, infrared light pass through optics gas chamber by infrared detector injection, infrared detector convert optical signals to electric signal and according to
Secondary to obtain detectable signal by signal amplification circuit and A/D conversion circuit, the detectable signal, which is sent to microprocessor, to be handled
And it is exported by telecommunication circuit.
2. a kind of infrared CO according to claim 12Gas sensor, it is characterised in that: the cavity of the optics gas chamber is
Flat tapered structure includes oblate end and round nose, which is equipped with gold-plated reflective layer, the oblateness
End is equipped with the infrared light supply mounting hole for installing infrared light supply, and the round nose is equipped with for installing the infrared of infrared detector
Detector mounting hole is equipped with air inlet at the oblateness end, gas outlet, the air inlet and air outlet is equipped at the round nose
Positioned at not ipsilateral.
3. a kind of infrared CO according to claim 12Gas sensor, it is characterised in that: the infrared detector is band filter
The binary channels infrared detector of mating plate, it includes that detection channels and reference are logical which, which is equipped with two-way light intensity induction channels,
Road, and the optical filter of different model is installed respectively at the induction window of induction channels, respectively detection optical filter and reference is filtered
Mating plate, and the infrared detector is built-in with thermistor.
4. based on a kind of infrared CO according to claim 1 to 32The calibration system of gas sensor, feature
It is: including sequentially connected standard gas bottle, pressure reducing valve, insulating box, gas-guide tube, humidifier, humidity sensor and infrared CO2Gas
Sensor, the gas-guide tube, humidifier, humidity sensor and infrared CO2Gas sensor is placed in insulating box.
5. according to claim 4 be based on infrared CO2The calibration system of gas sensor, it is characterised in that: the humidifier
From top to bottom successively including sink, for heating the water in the sink to generate the heating sheet of vapor, single-chip microcontroller control electricity
Road, the supplying cell for powering to humidifier, reservoir and the isolation board for supplying cell and reservoir to be isolated, the water storage
Pond is sink water supply by water pump and water pipe, and the single chip machine controlling circuit is connect with heating sheet, water pump, humidity sensor, also
Including the spin button for different humidity to be arranged, which is connected with single chip machine controlling circuit.
6. utilizing the humiture compensation method of calibration system according to claim 5, it is characterised in that: including following step
It is rapid:
Step 1: opening infrared CO2Gas sensor, detect its whether steady operation；
Step 2: by the standard gas bottle CO of calibration system2The standard density concentration CKIt is set as C1, valve is opened, detects whether gas leakage；
Step 3: setting humidifier humidity H as H1, 30%≤H1≤ 90%；
Step 4: opening insulating box, regulating thermostatic box temperature degree T is T1；
Step 5: waiting up to gas-guide tube is interior and infrared CO2Gas sensor interior constant temperature and humidity；
Step 6: opening pressure reducing valve, CO2Gas enters infrared CO by gas-guide tube2Gas sensor, until CO2Gas is full of red
Outer CO2Gas sensor records infrared detector reference channel voltage signal Vr, detection channels voltage signal Vm, close decompression
Valve；
Step 7: successively regulating thermostatic box temperature degree T is T2、T3、T4、T5, step 4 is repeated to step 6, and experiment terminates to close insulating box
And humidifier；
Step 8: setting humidifier humidity H is respectively H2、H3、H4、H5, 30%≤Hi≤ 90%, i=2,3,4,5, repeat step 4
To 7, experiment terminates to close standard gas bottle valve；
Step 9: replacement various concentration standard gas bottle, CO2Concentration is respectively C2、C3、C4、C5, step 2 is repeated to step 8；
Step 10: experiment terminates to close infrared CO2Gas sensor, by humidity H1Temperature T1Lower institute's measured data is according to lambert Bill
Law carries out formula inverting, obtains concentration expression formula:
Cr=f (Vr,Vm) (1)
It brings lower the surveyed voltage signal of remaining temperature and humidity into formula, obtains calculating concentration value Cr, the concentration value C that will be calculatedr、
Humidity value H and temperature value T are as fitting function Ck(T,H,Cr) input variable, using be based on the improved small echo of genetic algorithm
Neural network fusion algorithm carries out surface fitting, obtains fitting function:
Ck(T,H,Cr)=f (T, H, Vr,Vm) (2)
Utilize the CO2Gas concentration correction function carries out real-time compensation amendment.
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109709058A (en) * | 2018-12-20 | 2019-05-03 | 南京信息工程大学 | Infrared gas sensor and humidity compensation method based on AGA-Elman algorithm |
| CN110006837A (en) * | 2019-05-05 | 2019-07-12 | 南京信息工程大学 | A kind of NDIR gas sensor system and humiture compensation method |
| CN110018275A (en) * | 2019-04-10 | 2019-07-16 | 南京能启能电子科技有限公司 | A kind of gas detector with compensation function and compensation method |
| CN110333318A (en) * | 2019-06-24 | 2019-10-15 | 北京卡达克数据有限公司 | A kind of humidity compensation method and system for in-car smell on-line detecting system |
| CN111089849A (en) * | 2020-01-21 | 2020-05-01 | 成都千嘉科技有限公司 | System and method for preventing false alarm of NDIR alarm |
| CN111693481A (en) * | 2020-06-23 | 2020-09-22 | 贵州电网有限责任公司 | Determination of SF6Method for calibrating non-dispersive infrared absorption spectrum of CO content in gas |
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