CN115096838A - Synchronous detection device and method for components of multi-component polluted gas of industrial emission product - Google Patents
Synchronous detection device and method for components of multi-component polluted gas of industrial emission product Download PDFInfo
- Publication number
- CN115096838A CN115096838A CN202210700277.XA CN202210700277A CN115096838A CN 115096838 A CN115096838 A CN 115096838A CN 202210700277 A CN202210700277 A CN 202210700277A CN 115096838 A CN115096838 A CN 115096838A
- Authority
- CN
- China
- Prior art keywords
- gas
- signal
- prism
- beams
- component
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000001514 detection method Methods 0.000 title claims abstract description 32
- 238000000034 method Methods 0.000 title claims abstract description 21
- 230000001360 synchronised effect Effects 0.000 title claims abstract description 5
- 230000003595 spectral effect Effects 0.000 claims abstract description 24
- 230000008878 coupling Effects 0.000 claims abstract description 12
- 238000010168 coupling process Methods 0.000 claims abstract description 12
- 238000005859 coupling reaction Methods 0.000 claims abstract description 12
- 230000003993 interaction Effects 0.000 claims abstract description 9
- 230000008569 process Effects 0.000 claims abstract description 8
- 238000001228 spectrum Methods 0.000 claims description 16
- 238000004458 analytical method Methods 0.000 claims description 11
- 238000012544 monitoring process Methods 0.000 claims description 10
- 238000000411 transmission spectrum Methods 0.000 claims description 2
- 239000007789 gas Substances 0.000 description 64
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 14
- 238000010521 absorption reaction Methods 0.000 description 11
- 238000000862 absorption spectrum Methods 0.000 description 7
- 238000005259 measurement Methods 0.000 description 6
- XTQHKBHJIVJGKJ-UHFFFAOYSA-N sulfur monoxide Chemical class S=O XTQHKBHJIVJGKJ-UHFFFAOYSA-N 0.000 description 6
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 5
- GQPLMRYTRLFLPF-UHFFFAOYSA-N Nitrous Oxide Chemical compound [O-][N+]#N GQPLMRYTRLFLPF-UHFFFAOYSA-N 0.000 description 4
- 229910002090 carbon oxide Inorganic materials 0.000 description 4
- 238000001834 photoacoustic spectrum Methods 0.000 description 4
- 238000004847 absorption spectroscopy Methods 0.000 description 3
- TXKMVPPZCYKFAC-UHFFFAOYSA-N disulfur monoxide Inorganic materials O=S=S TXKMVPPZCYKFAC-UHFFFAOYSA-N 0.000 description 3
- 238000009776 industrial production Methods 0.000 description 3
- 238000004867 photoacoustic spectroscopy Methods 0.000 description 3
- 230000004044 response Effects 0.000 description 3
- 230000035945 sensitivity Effects 0.000 description 3
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical class [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 2
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 description 2
- 238000010219 correlation analysis Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 239000002440 industrial waste Substances 0.000 description 2
- 238000002329 infrared spectrum Methods 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 230000005236 sound signal Effects 0.000 description 2
- AKEJUJNQAAGONA-UHFFFAOYSA-N sulfur trioxide Chemical compound O=S(=O)=O AKEJUJNQAAGONA-UHFFFAOYSA-N 0.000 description 2
- 239000002912 waste gas Substances 0.000 description 2
- MGWGWNFMUOTEHG-UHFFFAOYSA-N 4-(3,5-dimethylphenyl)-1,3-thiazol-2-amine Chemical compound CC1=CC(C)=CC(C=2N=C(N)SC=2)=C1 MGWGWNFMUOTEHG-UHFFFAOYSA-N 0.000 description 1
- BWGNESOTFCXPMA-UHFFFAOYSA-N Dihydrogen disulfide Chemical compound SS BWGNESOTFCXPMA-UHFFFAOYSA-N 0.000 description 1
- 238000004566 IR spectroscopy Methods 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910001634 calcium fluoride Inorganic materials 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000002848 electrochemical method Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 238000001285 laser absorption spectroscopy Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- JCXJVPUVTGWSNB-UHFFFAOYSA-N nitrogen dioxide Inorganic materials O=[N]=O JCXJVPUVTGWSNB-UHFFFAOYSA-N 0.000 description 1
- 239000001272 nitrous oxide Substances 0.000 description 1
- 238000001745 non-dispersive infrared spectroscopy Methods 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000004445 quantitative analysis Methods 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 238000004611 spectroscopical analysis Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 229910052815 sulfur oxide Inorganic materials 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
Images
Classifications
-
- 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
- G01N21/33—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using ultraviolet light
-
- 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
- G01N21/1702—Systems in which incident light is modified in accordance with the properties of the material investigated with opto-acoustic detection, e.g. for gases or analysing solids
-
- 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
-
- 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
- G01N21/359—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light using near infrared light
-
- 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
- G01N21/1702—Systems in which incident light is modified in accordance with the properties of the material investigated with opto-acoustic detection, e.g. for gases or analysing solids
- G01N2021/1704—Systems in which incident light is modified in accordance with the properties of the material investigated with opto-acoustic detection, e.g. for gases or analysing solids in gases
Landscapes
- Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
The invention provides a synchronous detection device for components of multi-component pollution gas of an industrial emission product, which comprises: a laser group for emitting a plurality of light source beams of different wavelengths; the prism light beam coupling system is used for refracting a plurality of light source light beams for a plurality of times and then emitting the light beams as coaxial light beams; the multifunctional gas pool is used for generating various spectral signals by the interaction of the coaxial light beams and gas; and the detection system is used for acquiring a spectral signal generated in the process that the coaxial light beam interacts with the gas in the multifunctional gas cell and acquiring the component information of the multi-component polluted gas according to the detected signal and the type of the spectral signal. The invention effectively detects the components of the multi-component pollution gas of the industrial emission product.
Description
Technical Field
The invention belongs to the technical field of laser spectrum technology and gas detection, and particularly relates to a device and a method for synchronously detecting components of multi-component polluted gas of an industrial emission product.
Background
Industrial production and transportation are major sources of atmospheric pollution in the development of modern technology, including nitrogen oxides (e.g., nitric oxide, nitrogen dioxide, and nitrous oxide), sulfur oxides (e.g., sulfur dioxide, sulfur trioxide, disulfide trioxide, sulfur monoxide), and carbon oxides (e.g., carbon monoxide and carbon dioxide). The development of high-efficiency and real-time monitoring technology research on the content of nitric oxide, sulfur oxide and carbon oxide in industrial emission products has great significance in providing effective support data for realizing energy conservation and emission reduction and atmospheric environment monitoring and control in the production process of enterprises. At present, the analysis methods of industrial emission exhaust pollutants mainly comprise an electrochemical method, a differential absorption spectroscopy method, a Fourier infrared spectroscopy method and a non-dispersive infrared spectroscopy method. Due to the difference of the self principles of the various detection methods and the technical limitation, related analysis instruments can only realize the monitoring of part of polluted gases in industrial exhaust gas, and the comparison between data exists in potential uncertainty based on the monitoring results of the analysis methods based on different principles.
The optical detection technology based on the laser absorption spectrum is a reliable and effective typical industrial pollution gas component detection method due to the advantages of high sensitivity, high response speed, real-time measurement and the like. Laser absorption spectroscopy is an analysis technique for realizing quantitative analysis and qualitative identification of molecular components by using unique fingerprint spectrum characteristics of molecules, and the sensitivity of the analysis technique depends on the selection of fingerprint absorption lines to a great extent. The spectral distribution characteristics of different molecules are significantly different due to the difference of their own structural characteristics. Such as nitrogen oxides NO and NO 2 The molecular strong absorption spectrum range is distributed in the deep ultraviolet 200nm-230nm (wavelength) and ultraviolet 300nm-500nm (wavelength), and N is 2 The strong absorption spectrum range of the O molecule is located between the middle infrared 4424nm and 4598nm (wavelength). In addition, SO 2 The strong absorption region of the molecule is distributed in the range of 250-330nm (wavelength), and CO 2 The strong absorption regions of (2) are respectively positioned near 4660nm (wavelength) and 4255nm (wavelength), while the absorption line of the near infrared band of 1580nm (wavelength) is weaker, but the strong absorption regions can be used for the simultaneous measurement of the two molecules. Furthermore, oxygen (O) in industrial waste gas 2 ) Is an important index for monitoring the combustion efficiency and state, and O 2 Is located in the vicinity of the visible wavelength band 760 nm. In view of the large gap interval range of the strong absorption spectrum range of nitrogen oxide, sulfur oxide, carbon oxide and oxygen, the limitation of the continuously tunable wavelength output range of various laser light sources and the limitation of the spectral response bandwidth of the traditional photoelectric detector, the photoelectric detector needs to be used for the photoelectric detectorThe realization of the simultaneous high-sensitivity detection of the components of the typical industrial polluted gas has very high challenge, and particularly, an integrated multi-component gas pollutant analyzer based on the same detection method and principle has no relevant report at home and abroad.
Therefore, it is necessary to design a device for synchronously detecting the components of multi-component pollution gas of industrial emission products to solve the existing technical problems.
Disclosure of Invention
The invention provides a device for synchronously detecting components of multi-component polluted gas of an industrial emission product, aiming at the key problems in the technology of simultaneously measuring the multi-component gas of integrated nitrogen oxide, sulfur oxide and carbon oxide in the industrial emission product, and the device comprises:
a laser group for emitting a plurality of source beams of different wavelengths;
the prism light beam coupling system is used for refracting a plurality of light source light beams for a plurality of times and then emitting the light beams as coaxial light beams;
the multifunctional gas pool is used for generating various spectral signals by the interaction of the coaxial light beams and gas;
and the detection system is used for acquiring a spectral signal generated in the process that the coaxial light beam interacts with the gas in the multifunctional gas cell and acquiring the component information of the multi-component polluted gas according to the detected signal and the type of the spectral signal.
Further, the laser includes:
the short-wave laser is used for emitting light source beams with deep ultraviolet wavelengths;
the medium wave laser is used for emitting light source beams with visible light or near infrared light wavelengths;
the long-wave laser is used for emitting light source beams with middle infrared wavelengths.
Further, the prism-to-beam coupling system comprises a first prism and a second prism, wherein one side of the second prism is arranged in parallel with one side of the first prism.
Further, install temperature and humidity sensor in the multi-functional gas pond for the monitoring of temperature and humidity in the multi-functional gas pond.
Furthermore, two channels are arranged in the multifunctional gas pool, namely a signal channel and a background reference channel respectively, wherein,
the signal channel is a passage channel of coaxial light beams;
the background reference channel is a channel without light incidence.
Further, the detection system comprises:
the tuning fork detector is used for receiving the coaxial light beams passing through the multifunctional gas cell and detecting the spectrum signals of the coaxial light beams;
the two acoustic signal detectors are used for detecting signals, are arranged in the middle of the two channels and are arranged at the top and the bottom of the multifunctional gas cell, wherein the acoustic signal detector at the top of the cell is used for detecting a reference background signal without light incidence, and the acoustic signal detector at the bottom of the cell is used for detecting the acoustic signal of the coaxial beam laser;
the differential amplifying circuit is used for carrying out differential operation according to the photoacoustic signal of the coaxial beam laser and the reference background signal without light incidence and outputting a differential photoacoustic signal with high signal-to-noise ratio;
and the intelligent signal analysis module is used for acquiring the component information of the multi-component polluted gas according to the differential photoacoustic signal and the transmission spectrum signal of the coaxial light beam.
In another aspect, the present invention further provides a method for synchronously detecting components of a multi-component contaminated gas of an industrial emission product, wherein the method comprises:
using a laser group to emit a plurality of light source beams with different wavelengths;
the prism is used for refracting a plurality of light source light beams for a plurality of times for the light beam coupling system and then emitting the light beams as coaxial light beams;
utilizing a multifunctional gas pool for generating a plurality of spectral signals by the interaction of the coaxial light beams and gas;
and acquiring a spectral signal generated in the process of interaction between the coaxial light beam and the gas in the multifunctional gas cell by using a detection system, and acquiring the component information of the multi-component polluted gas according to the detected signal and the type of the spectral signal.
Further, the laser includes:
the short-wave laser is used for emitting light source beams with deep ultraviolet wavelengths;
the medium wave laser is used for emitting light source beams with visible light or near infrared light wavelengths;
the long-wave laser is used for emitting light source beams with middle infrared wavelengths.
Further, the prism-to-beam coupling system comprises a first prism and a second prism, wherein one side of the second prism is arranged in parallel with one side of the first prism.
The invention has the beneficial effects that:
according to the device and the method for synchronously detecting the components of the multi-component polluted gas of the industrial emission product, provided by the invention, the reliability of correlation analysis of the detection result is improved, and the device and the method have important application values in the fields of industrial production waste gas monitoring, atmospheric environment and the like.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 shows a schematic structural diagram of an apparatus according to an embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, the present invention provides a synchronous detection device for the components of multi-component pollution gas of industrial emission products, which comprises:
a laser group for emitting a plurality of light source beams of different wavelengths;
the prism beam coupling system is used for refracting a plurality of light source beams for a plurality of times and then emitting the light source beams as coaxial beams;
the multifunctional gas cell is used for enabling the emitted coaxial light beams to interact with gas to generate various spectral signals;
and the detection system is used for acquiring a spectral signal generated in the process of interaction between the coaxial light beam and the gas in the multifunctional gas cell and acquiring the component information of the multi-component polluted gas according to the detected signal and the type of the spectral signal.
This will be described in detail below.
The laser instrument includes short wave laser instrument, medium wave laser instrument and long wave laser instrument, wherein:
the short-wave laser is used for emitting light source beams with deep ultraviolet wavelengths;
the medium wave laser is used for emitting light source beams with visible light or near infrared light wavelengths;
the long-wave laser is used for emitting light source beams with middle infrared wavelengths.
The short-wave laser has a spectrum range of deep ultraviolet, and can be used for NO/NO 2 /SO 2 Spectroscopic measurement of molecules and, therefore, can be used to emit source beams of deep ultraviolet wavelengths;
the wavelength range of the medium wave laser is in the visible light or near infrared spectrum range, and can be used for O in industrial waste gas 2 /CO/CO 2 Spectroscopic measurement of molecules and, therefore, can be used for source beams emitting visible or near-infrared wavelengths;
the wavelength range of the long-wave laser is in the middle infrared range and can be used for N 2 O/CO/CO 2 High sensitivity spectroscopic measurement of molecules and, therefore, for emitting a source beam of light at mid-infrared wavelengths.
The prism-to-beam coupling system includes a first prism (prism 1) and a second prism (prism 2), and is combined in an inverse-symmetrical manner, i.e., as shown in the drawing, one side of the second prism is disposed in parallel with one side of the first prism. The first prism and the second prism are both made of calcium fluoride (CaF2), the spectral response range of the first prism and the second prism is from ultraviolet to infrared (180nm-8.0 mu m) transparent, and the first prism and the second prism have high damage threshold, low fluorescence, high uniformity, high mechanical stability and environmental stability.
The short-wave laser, the medium-wave laser and the long-wave laser respectively enter the prism as parallel beams to the first prism in the beam coupling system, and the beams of the short-wave laser, the medium-wave laser and the long-wave laser are separated out by the first prism at different refraction angles respectively due to the dependency of the prism refractive index and the incident light wavelength, reach the second prism after being emergent, and are emergent as coaxial beams after being refracted by the second prism. The coaxial light beam directly enters the multifunctional gas pool after being emitted.
Install temperature and humidity sensor in the multi-functional gas cell for the monitoring of temperature and humidity in the multi-functional gas cell, the multi-functional gas cell can be single pass type or the multi-time reflection-type multi-functional gas cell. Two channels, namely a signal channel and a background reference channel, are arranged in the multifunctional gas pool, wherein,
the signal channel is a passing channel of the coaxial light beam;
the background reference channel is a channel without light incidence.
The detection system comprises:
the tuning fork detector is used for receiving the coaxial light beams passing through the multifunctional gas cell and detecting the spectrum signals of the coaxial light beams;
the acoustic signal detectors are arranged at the middle positions of the two channels and are arranged at the top and the bottom of the multifunctional gas cell, wherein the acoustic signal detector at the top of the cell is used for detecting a reference background signal without light incidence, and the acoustic signal detector at the bottom of the cell is used for detecting an acoustic signal of the coaxial beam laser.
The differential amplification circuit is used for carrying out differential operation according to the sound signal incident by the coaxial light beam and the reference sound signal without light incidence and outputting a differential signal;
and the intelligent signal analysis module is used for acquiring concentration information of the components of the multi-component polluted gas according to the difference signal, the spectrum signal of the coaxial light beam and the temperature and humidity parameters.
In this embodiment, the multi-functional gas cell is used for placing the gas to be detected, when the incident light (the coaxial light beam in this embodiment) passes through the multi-functional gas cell, inside the cell, the incident light and the gas generate an interaction process, such as an absorption process, so as to excite a "photoacoustic signal" and an "absorption signal", where the "photoacoustic signal" is detected and output by the in-cell acoustic signal detector, and the light transmitted from the multi-functional gas cell includes the "absorption signal" and is detected and output by the tuning fork detector. Therefore, the multifunctional gas cell has multifunctional characteristics, and can realize gas molecule detection of different spectroscopic methods according to detection requirements.
After being emitted from the multifunctional gas cell, the coaxial light beam is focused by the focusing lens and then directly enters the tuning fork detector, the tuning fork detector inputs three laser spectrum signals (namely three absorption signals) to the intelligent signal analysis module, and the intelligent signal analysis module carries out signal analysis according to the self-defined signal source and the principles of photoacoustic spectrum (spectrum corresponding to the photoacoustic signal) and absorption spectrum (spectrum corresponding to the absorption signal).
The detection method of each molecule to be detected can be freely selected among resonance photoacoustic spectroscopy, wavelength modulation absorption spectroscopy and correction-free (2F/1F) wavelength modulation absorption spectroscopy. The implementation requirements of various spectral methods are respectively as follows:
1) resonance photoacoustic spectrometry detection method: when an excitation light source (light source light beam emitted by a short-wave laser, a medium-wave laser and/or a long-wave laser) of the molecule to be detected is a pulse light source, the pulse repetition rate is set to be consistent with the resonance frequency of the multifunctional gas cell; when the laser light source is a continuous light source, the modulation frequency f of the laser light source can be set to be consistent with the resonance frequency of the multifunctional gas pool in the ways of square wave modulation, acousto-optic modulation, electro-optic modulation, mechanical chopping modulation and the like. The photoacoustic signal is detected by an acoustic signal detector inside the multifunctional gas cell.
2) Wavelength-modulated photoacoustic spectroscopy: modulating a continuous light source corresponding to a molecule to be detected by using a single-frequency sine wave, wherein the modulation frequency f of the sine wave is half of the resonance frequency of the multifunctional gas pool when second harmonic detection is selected; when the first harmonic detection is selected, the sine wave modulation frequency f is consistent with the resonance frequency of the multifunctional gas pool. The wavelength modulation photoacoustic spectrum signal is detected by an acoustic signal detector in the multifunctional gas cell.
3) Wavelength modulation absorption spectrum: carrying out high-frequency modulation on a continuous light source corresponding to a molecule to be detected by utilizing a single-frequency sine wave, wherein when second harmonic detection is selected, the sine wave modulation frequency f is half of the resonance frequency of the tuning fork detector; when the first harmonic detection is selected, the sine wave modulation frequency f is consistent with the resonance frequency of the tuning fork detector. The wavelength modulation spectrum signal is detected by a tuning fork detector outside the multifunctional gas cell.
4) Calibration-free (2F/1F) wavelength modulation absorption Spectrum: and modulating the continuous light source corresponding to the molecules to be detected by using a mixing sine wave, wherein the mixing sine wave signals are respectively formed by superposing a sine wave signal with the frequency of the resonance frequency f of the tuning fork detector and a sine wave signal with the half f/2 of the resonance frequency of the tuning fork detector, the mixing sine wave signals respectively correspond to a first harmonic signal and a second harmonic signal, and the two harmonic signals are detected by the tuning fork detector outside the multifunctional gas pool.
5) When a plurality of molecules adopt the same spectrum detection method, the selection of the modulation frequency needs to be set within the bandwidth range of the resonance frequency of the multifunctional gas cell and the sound fork detector, and the modulation frequencies are kept different and are close to the position of the central resonance frequency as much as possible.
A plurality of laser light sources in a deep ultraviolet to mid-infrared spectrum range are effectively coupled into a light beam of a coaxial light path based on the wide spectral range high transmittance and the prism refraction principle of a calcium fluoride medium, double-spectrum detection of photoacoustic spectrum and wavelength modulation spectrum is achieved by a single multifunctional gas cell integrating functions of a photoacoustic cell and an absorption cell, multiple components are detected by the photoacoustic spectrum and the wavelength modulation spectrum, a single quartz tuning fork detector replaces a traditional photoelectric detector to achieve ultra-wide spectral range spectrum signal detection, the whole structure of the system is simpler and more compact, the time resolution is high, the functions are more abundant, the reliability of correlation analysis of measurement results is improved, and the system has important application value in the fields of industrial production waste gas monitoring and the like.
Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (9)
1. A synchronous detection device for components of multi-component pollution gas of industrial emission products is characterized by comprising:
a laser group for emitting a plurality of light source beams of different wavelengths;
the prism light beam coupling system is used for refracting a plurality of light source light beams for a plurality of times and then emitting the light beams as coaxial light beams;
the multifunctional gas cell is used for generating various spectral signals by the interaction of the coaxial light beams and gas;
and the detection system is used for acquiring a spectral signal generated in the process that the coaxial light beam interacts with the gas in the multifunctional gas cell and acquiring the component information of the multi-component polluted gas according to the detected signal and the type of the spectral signal.
2. The device for synchronously detecting the components of the multi-component pollution gas of the industrial emission product according to claim 1, wherein the laser comprises:
the short-wave laser is used for emitting light source beams with deep ultraviolet wavelengths;
the medium wave laser is used for emitting light source beams with visible light or near infrared light wavelengths;
the long-wave laser is used for emitting light source beams with middle infrared wavelengths.
3. The device for synchronously detecting the components of the multi-component pollution gas of the industrial emission product according to claim 2, wherein the prism-to-beam coupling system comprises a first prism and a second prism, wherein one side of the second prism is arranged in parallel with one side of the first prism.
4. The device for synchronously detecting the components of the multi-component polluted gas of the industrial emission product as claimed in claim 3, wherein a temperature and humidity sensor is installed in the multifunctional gas pool and used for monitoring the temperature and the humidity in the multifunctional gas pool.
5. The device for synchronously detecting the components of the multi-component polluted gas of the industrial emission product according to claim 4, wherein two channels, namely a signal channel and a background reference channel, are arranged in the multifunctional gas pool,
the signal channel is a passage channel of coaxial light beams;
the background reference channel is a channel without light incidence.
6. The device for synchronously detecting the components of the multi-component pollution gas of the industrial emission product according to claim 5, wherein the detection system comprises:
the tuning fork detector is used for receiving the coaxial light beams passing through the multifunctional gas cell and detecting the spectrum signals of the coaxial light beams;
the two acoustic signal detectors are used for detecting signals, are arranged in the middle of the two channels and are arranged at the top and the bottom of the multifunctional gas cell, wherein the acoustic signal detector at the top of the cell is used for detecting a reference background signal without light incidence, and the acoustic signal detector at the bottom of the cell is used for detecting the acoustic signal of the coaxial beam laser;
the differential amplifying circuit is used for carrying out differential operation according to the photoacoustic signal of the coaxial beam laser and the reference background signal without light incidence and outputting a differential photoacoustic signal with high signal-to-noise ratio;
and the intelligent signal analysis module is used for acquiring the component information of the multi-component polluted gas according to the differential photoacoustic signal and the transmission spectrum signal of the coaxial light beam.
7. A synchronous detection method for components of multi-component pollution gas of industrial emission products is characterized by comprising the following steps:
using a laser group to emit a plurality of light source beams with different wavelengths;
the prism is used for refracting a plurality of light source light beams for a plurality of times for the light beam coupling system and then emitting the light beams as coaxial light beams;
utilizing a multifunctional gas pool for generating a plurality of spectral signals by the interaction of the coaxial light beams and gas;
and acquiring a spectral signal generated in the process of interaction between the coaxial light beam and the gas in the multifunctional gas cell by using a detection system, and acquiring the component information of the multi-component polluted gas according to the detected signal and the type of the spectral signal.
8. The method for synchronously detecting the components of the multi-component polluted gas of the industrial emission product according to claim 7, wherein the laser comprises:
the short-wave laser is used for emitting light source beams with deep ultraviolet wavelengths;
the medium wave laser is used for emitting light source beams with visible light or near infrared light wavelengths;
the long-wave laser is used for emitting light source beams with middle infrared wavelengths.
9. The device for synchronously detecting the components of the multi-component pollution gas of the industrial emission product according to claim 7, wherein the prism-to-beam coupling system comprises a first prism and a second prism, wherein one side of the second prism is arranged in parallel with one side of the first prism.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210700277.XA CN115096838A (en) | 2022-06-20 | 2022-06-20 | Synchronous detection device and method for components of multi-component polluted gas of industrial emission product |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210700277.XA CN115096838A (en) | 2022-06-20 | 2022-06-20 | Synchronous detection device and method for components of multi-component polluted gas of industrial emission product |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115096838A true CN115096838A (en) | 2022-09-23 |
Family
ID=83292673
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210700277.XA Pending CN115096838A (en) | 2022-06-20 | 2022-06-20 | Synchronous detection device and method for components of multi-component polluted gas of industrial emission product |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115096838A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118111940A (en) * | 2024-03-21 | 2024-05-31 | 武汉怡特环保科技有限公司 | Atmospheric sulfide analysis method, apparatus, storage medium and electronic device |
-
2022
- 2022-06-20 CN CN202210700277.XA patent/CN115096838A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118111940A (en) * | 2024-03-21 | 2024-05-31 | 武汉怡特环保科技有限公司 | Atmospheric sulfide analysis method, apparatus, storage medium and electronic device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104237135B (en) | CO gas detecting systems and method based on quartz tuning fork strengthened optoacoustic spectroscopy | |
| US5444528A (en) | Tunable spectrometer with acousto-optical tunable filter | |
| CN110044824B (en) | Quartz tuning fork-based dual-spectrum gas detection device and method | |
| CA1179861A (en) | Method and apparatus for measuring the concentration of gaseous hydrogen fluoride | |
| CN108279209A (en) | A kind of more gas detecting systems of wave-length coverage and wavelength continuously adjustable | |
| CN208013060U (en) | A kind of more gas detecting systems of wave-length coverage and wavelength continuously adjustable | |
| CN109813639B (en) | Infrared light modulation technology-based synchronous measurement device and measurement method for concentration of particulate matters and gas | |
| Liang et al. | Multiplex-gas detection based on non-dispersive infrared technique: a review | |
| He et al. | Simultaneous multi-laser, multi-species trace-level sensing of gas mixtures by rapidly swept continuous-wave cavity-ringdown spectroscopy | |
| CN113916802A (en) | Automatic calibration open-circuit type laser gas detection device and implementation method | |
| CN115096838A (en) | Synchronous detection device and method for components of multi-component polluted gas of industrial emission product | |
| CN114018829B (en) | Double-optical comb multicomponent gas detection system with tuning fork resonance enhancement | |
| CN108535191B (en) | Laser Raman gas detection device based on rhombus cavity mirror | |
| CN201210140Y (en) | Multi-parameter laser wavelength modulation spectrum detection apparatus used in fire field | |
| CN114002184B (en) | Multi-resonance enhanced photoacoustic spectrum multi-component gas simultaneous detection device and method | |
| CN215574610U (en) | Single resonant cavity photoacoustic spectroscopy system for simultaneously detecting multiple gases | |
| Hu et al. | Near-infrared dual-gas sensor for simultaneous detection of CO and CH 4 using a double spot-ring plane-concave multipass cell and a digital laser frequency stabilization system | |
| CN111398215B (en) | Portable intermediate infrared high-sensitivity multi-component gas measurement and analysis system | |
| CN115561195A (en) | Single-cavity double-comb light source and gas detection system based on same | |
| CN111122444A (en) | Multiple resonant T-shaped enhanced multiple trace gas simultaneous detection device | |
| CN213633165U (en) | Nitrogen oxide measuring system based on laser spectrum absorption method | |
| CN212568461U (en) | High-speed high-precision NDIR sensor | |
| CN114965358B (en) | Multicomponent gas synchronous correction-free detection device and method based on single detector | |
| Qu et al. | Detection of chemical warfare agents based on quantum cascade laser cavity ring-down spectroscopy | |
| Beenen et al. | Development of a photoacoustic trace gas sensor based on fiber-optically coupled NIR laser diodes |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |