CN114397248A - Narrow-band light source gas concentration detection device and measurement method based on Fourier spectrometer - Google Patents
Narrow-band light source gas concentration detection device and measurement method based on Fourier spectrometer Download PDFInfo
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- CN114397248A CN114397248A CN202210123386.XA CN202210123386A CN114397248A CN 114397248 A CN114397248 A CN 114397248A CN 202210123386 A CN202210123386 A CN 202210123386A CN 114397248 A CN114397248 A CN 114397248A
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- 238000001514 detection method Methods 0.000 title claims abstract description 35
- 238000000691 measurement method Methods 0.000 title abstract description 8
- 230000005855 radiation Effects 0.000 claims abstract description 15
- 230000035945 sensitivity Effects 0.000 claims abstract description 13
- 238000010438 heat treatment Methods 0.000 claims abstract description 4
- 238000001228 spectrum Methods 0.000 claims abstract 2
- 238000000411 transmission spectrum Methods 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 10
- 238000010521 absorption reaction Methods 0.000 claims description 6
- 230000007423 decrease Effects 0.000 claims description 4
- 238000004020 luminiscence type Methods 0.000 claims description 4
- 238000012360 testing method Methods 0.000 abstract description 4
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 description 9
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000007792 addition Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007084 catalytic combustion reaction Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 238000011160 research Methods 0.000 description 1
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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
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
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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
The invention discloses a narrow-band light source gas concentration detection device and a measurement method based on a Fourier spectrometer. The invention aims to solve the problems of contact with gas or low testing sensitivity, single testing means and the like in the existing gas concentration testing method. According to the detection device, infrared narrow-band light emitted by a narrow-band radiation light source enters a Fourier spectrometer, a gas bin is placed in a sample bin of the Fourier spectrometer, and finally a detector detects a spectrum. The narrow-band radiation light source emits narrow-band infrared light by heating the narrow-band radiator, or the narrow-band infrared light source is obtained by the broadband infrared light source through the narrow-band filter. The narrow-band radiation light source is incident into the Fourier spectrometer through an external light source port. The gas to be measured is added into the gas cabin, and the concentration of the filled gas can be controlled. The gas concentration detection method has the advantages of high sensitivity, non-contact detection and the like.
Description
Technical Field
The invention relates to the field of gas sensors, relates to an infrared gas sensing detection device and a detection method thereof, and particularly relates to non-contact high-sensitivity gas concentration detection.
Background
Gas concentration detection plays a crucial role in human life and industrial production. Common gas concentration detection methods include a semiconductor type sensor, a catalytic combustion type sensor, an electrochemical type sensor and the like, but the methods all require that an instrument to be detected is in contact with the sensor and even generates a chemical reaction to further detect the gas concentration, so that the danger of gas leakage to be detected is inevitable, and the service life of the sensor is short. The infrared sensor solves the problem that the gas to be detected is in contact with the sensor, and the concentration of the gas can be further calculated by measuring the attenuation of the light intensity passing through the gas to be detected. Therefore, research on non-contact high-sensitivity gas detection devices becomes a hot point in the field of gas detection. Aiming at the problems existing in the traditional gas detection, the invention discloses a gas concentration detection device based on a Fourier instrument narrow-band radiation source and a measurement method thereof.
Disclosure of Invention
The invention discloses a device and a method for detecting the concentration of gas in a narrow-band light source based on a Fourier spectrometer, and a structural schematic diagram is shown in figure 1. The device comprises a narrow-band light source 1, a Fourier spectrometer 2, a gas bin 3 and a detector 4.
The invention aims to provide a non-contact high-sensitivity gas concentration detection device and a measurement method thereof, which make up the defects of short detection life, high price and easy damage of a chemical method and the problem of low sensitivity of an infrared measurement method, and realize the non-contact high-sensitivity gas concentration detection.
The invention aims to provide an infrared sensor which is used for detecting gas concentration in a non-contact mode.
The second purpose of the invention is high-sensitivity gas concentration detection, which is more than 10 times higher than the broadband infrared type sensitivity.
The purpose of the invention can be realized by the following technical scheme:
1. based on Fourier spectrometer narrowband light source gas concentration detection device includes: the device comprises a narrow-band radiation source 1, a Fourier spectrometer 2, a gas bin 3 and a detector 4.
2. The device for detecting the concentration of the gas based on the narrow-band light source of the Fourier spectrometer is characterized in that: a) the narrow-band radiation light source emits narrow-band light by heating the narrow-band radiator, or the broadband light source obtains the narrow-band light source through the narrow-band filter; b) adding gas to be detected into the gas bin, sealing the gas bin and fixing the volume; c) the Fourier spectrometer can be used as an external light source.
3. The light source of the gas concentration detection device is a narrow band, and the narrow band peak is the same as the absorption peak of the gas to be detected.
4. The gas chamber of the gas concentration detection device is closed, and the volume V of the gas chamber is fixed.
5. The gas concentration detection device and the measurement method thereof comprise the following steps:
step 1: the light source emission peak is the same as the absorption peak of the gas to be detected;
step 2: calibrating gas concentration, filling air into the gas bin, detecting the transmission spectrum by a Fourier spectrometer, wherein the light intensity of the light source emission peak position is I0The gas concentration C is introduced1Measuring the transmission spectrum, the intensity of the emission peak I1……InN is usually taken until the emission peak intensity no longer decreases;
and step 3: with gas concentration C as the x-axis, sensitivity S: s ═ I (I)0-In)/I0A gas concentration map is plotted for the y-axis.
And 4, step 4: measuring gas concentration, filling air into the gas bin, detecting the transmission spectrum by a Fourier spectrometer, wherein the light intensity of the light source emission peak position is I0Is filled into VxVolume of gas V to be measuredx<<V, measuring the light intensity I of the luminescence peak positionx，(I0-In)/I0Finding the corresponding gas concentration C in the concentration mapaFurther calculating the concentration C of the insufflation gasx＝Ca(V/Vx)。
Compared with the prior art, the invention has the following beneficial effects:
1. the gas concentration detection device of the invention makes up the defects of short detection life, high price and easy damage of a chemical method, and is used for infrared sensing measurement.
2. The gas concentration detection device provided by the invention makes up the problem of low sensitivity of an infrared type measurement method, realizes non-contact high-sensitivity gas concentration detection, and has sensitivity higher than that of a broadband infrared type by more than 10 times.
Drawings
FIG. 1 is a gas concentration detection device based on a Fourier spectrometer narrowband infrared radiation source of the present invention;
reference numerals:
1-narrow band radiation source, 2-Fourier spectrometer, 3-gas chamber, 4-detector.
FIG. 2 shows the formaldehyde sensitivity of the gas concentration detection device based on the Fourier spectrometer narrowband infrared radiation source and the formaldehyde sensitivity of the gas concentration detection device using a black body as a light source;
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments. The present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the scope of the present invention is not limited to the following embodiments.
As shown in fig. 1, a schematic diagram of a gas concentration detection device based on a fourier spectrometer narrowband infrared radiation source:
the method comprises the following steps: the device comprises a narrow-band radiation source 1, a Fourier spectrometer 2, a gas bin 3 and a detector 4. The method is characterized in that: a) the narrow-band radiation light source emits narrow-band light by heating the narrow-band radiator, or the broadband light source obtains the narrow-band light source through the narrow-band filter; b) adding gas to be detected into the gas bin, sealing the gas bin and fixing the volume; c) the Fourier spectrometer can be used as an external light source.
The test of the gas concentration detection device comprises the following steps:
step 1: the light source emission peak is the same as the absorption peak of the gas to be detected;
step 2: calibrating gas concentration, filling air into the gas bin, detecting the transmission spectrum by a Fourier spectrometer, wherein the light intensity of the light source emission peak position is I0The gas concentration C is introduced1Measuring the transmission spectrum, the intensity of the emission peak I1……InN is usually taken until the emission peak intensity no longer decreases;
and step 3: with gas concentration C as the x-axis, sensitivity S: s ═ I (I)0-In)/I0A gas concentration map is plotted for the y-axis.
And 4, step 4: measuring gas concentration, filling air into the gas bin, detecting the transmission spectrum by a Fourier spectrometer, wherein the light intensity of the light source emission peak position is I0Is filled into VxVolume of gas V to be measuredx<<V, measuring the light intensity I of the luminescence peak positionx，(I0-In)/I0Finding the corresponding gas concentration C in the concentration mapaFurther calculating the concentration C of the insufflation gasx＝Ca(V/Vx)。
Example one
The device for detecting the concentration of the gas based on the Fourier spectrometer narrow-band light source and the measuring method comprise the following steps:
step 1: selecting a proper light source with an emission peak of 3.58um, wherein the absorption peak of formaldehyde molecules is also 3.58 um;
step 2: calibrating gas concentration, filling air into the gas bin, detecting the transmission spectrum by a Fourier spectrometer, wherein the light intensity of the light source emission peak position is I0The gas concentration C is introduced1Measuring the transmission spectrum, the intensity of the emission peak I1… … until the emission peak intensity no longer decreases;
and step 3: with gas concentration C as the x-axis, sensitivity S: s ═ I (I)0-In)/I0The gas concentration is plotted against the y-axis, as shown in the black dot line graph of fig. 2.
And 4, step 4: and (5) repeating the step (2) and the step (3), taking the black body as a light source, and drawing the corresponding relation between the sensitivity of the black body and the gas concentration, as shown in a black triangular line chart of fig. 2.
And 5: measuring gas concentration, filling air into the gas bin, detecting the transmission spectrum by a Fourier spectrometer, wherein the light intensity of the light source emission peak position is I0Is filled into VxVolume of gas V to be measuredx<<V, measuring the light intensity I of the luminescence peak positionx，(I0-In)/I0Finding the corresponding gas concentration C in the concentration mapaFurther calculating the concentration C of the insufflation gasx＝Ca(V/Vx)。
In addition, it should be noted that the specific embodiments described in the present specification may have different names, and the above descriptions in the present specification are only illustrations of the structures of the present invention. Minor or simple variations in the structure, features and principles of the present invention are included within the scope of the present invention. Various modifications or additions may be made to the described embodiments or methods may be similarly employed by those skilled in the art without departing from the scope of the invention as defined in the appending claims.
Claims (4)
1. A narrowband light source gas concentration detection device based on a Fourier spectrometer comprises: narrowband radiation source (1), Fourier spectrum appearance (2), gas chamber (3), detector (4), its characterized in that:
the narrow-band radiation light source (1) emits narrow-band light by heating the narrow-band radiator, or the wide-band light source obtains the narrow-band light source through the narrow-band filter; the gas to be detected is added into the gas bin (3), and the gas bin is closed and has a fixed volume; the Fourier spectrometer (2) is provided with a port capable of being connected with an external light source.
2. The fourier spectrometer based narrow band light source gas concentration detection device of claim 1, wherein: the bandwidth of the narrow-band radiation light source (1) is consistent with the absorption peak of the gas to be detected.
3. The fourier spectrometer based narrow band light source gas concentration detection device of claim 1, wherein: the gas bin (3) is closed, and the volume of the gas bin is V.
4. A method for measuring the concentration of a narrow-band light source gas based on a Fourier spectrometer is characterized by comprising the following steps:
step 1: the light source emission peak is the same as the absorption peak of the gas to be detected;
step 2: calibrating gas concentration, filling air into the gas bin, detecting the transmission spectrum by a Fourier spectrometer, wherein the light intensity of the light source emission peak position is I0The gas concentration C is introduced1Measuring the transmission spectrum, the intensity of the emission peak I1……InN is usually taken until the emission peak intensity no longer decreases;
and step 3: with gas concentration C as the x-axis, sensitivity S: s ═ I (I)0-In)/I0Drawing a gas concentration corresponding graph for the y-axis;
and 4, step 4: measuring gas concentration, filling air into the gas bin, detecting the transmission spectrum by a Fourier spectrometer, wherein the light intensity of the light source emission peak position is I0Is filled into VxVolume of gas V to be measuredx<<V, measuring the light intensity I of the luminescence peak positionx，(I0-In)/I0Finding the corresponding gas concentration C in the concentration mapaFurther calculating the concentration C of the insufflation gasx＝Ca(V/Vx)。
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210123386.XA CN114397248A (en) | 2022-02-10 | 2022-02-10 | Narrow-band light source gas concentration detection device and measurement method based on Fourier spectrometer |
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| CN202210123386.XA CN114397248A (en) | 2022-02-10 | 2022-02-10 | Narrow-band light source gas concentration detection device and measurement method based on Fourier spectrometer |
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