CN116577298B - Multi-component high-stability small open-circuit greenhouse gas analyzer - Google Patents
Multi-component high-stability small open-circuit greenhouse gas analyzer Download PDFInfo
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- CN116577298B CN116577298B CN202310826535.3A CN202310826535A CN116577298B CN 116577298 B CN116577298 B CN 116577298B CN 202310826535 A CN202310826535 A CN 202310826535A CN 116577298 B CN116577298 B CN 116577298B
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- 239000005431 greenhouse gas Substances 0.000 title claims abstract description 21
- 238000001514 detection method Methods 0.000 claims abstract description 27
- 230000003287 optical effect Effects 0.000 claims abstract description 14
- 238000010438 heat treatment Methods 0.000 claims abstract description 10
- 239000007789 gas Substances 0.000 claims description 19
- 238000001914 filtration Methods 0.000 claims description 18
- 238000012545 processing Methods 0.000 claims description 18
- 239000012528 membrane Substances 0.000 claims description 17
- 238000005259 measurement Methods 0.000 claims description 10
- 230000001360 synchronised effect Effects 0.000 abstract description 8
- 230000007613 environmental effect Effects 0.000 abstract description 6
- 238000010926 purge Methods 0.000 abstract description 4
- 238000004140 cleaning Methods 0.000 abstract description 3
- 238000012544 monitoring process Methods 0.000 abstract description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 3
- 238000010521 absorption reaction Methods 0.000 description 4
- 239000000428 dust Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000001745 non-dispersive infrared spectroscopy Methods 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 238000011897 real-time detection Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000000041 tunable diode laser absorption spectroscopy 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
- G01N21/17—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
- 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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- Biochemistry (AREA)
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Abstract
The invention relates to the technical field of environmental monitoring, in particular to a multicomponent high-stability small open-circuit greenhouse gas analyzer, which comprises a main end, an auxiliary end and a secondary end, wherein the main end and the auxiliary end are connected by a plurality of hollow rods, and the secondary end is fixed on the main end 4 、CO 2 And H 2 O miniaturized synchronous frequency division detection and synchronous wavelength calibration; the invention greatly improves the system stability: the heating paste is added on the main-end optical filter, so that the occurrence of condensed water can be well avoided, and the stability is improved; three paths of synchronous locking are realized, the real-time accurate locking of the wavelength is realized, and the stability is improved; the number of slave ends is increased to realize automatic purging and cleaning of the lenses of the main end and the auxiliary end, so that the stability is improved; the circuit has the advantages that the light intensity self-adaptive adjusting function is added, and the problem that detection is affected by weaker signals caused by the external environment is solved.
Description
Technical Field
The invention relates to the technical field of environmental monitoring, in particular to a multi-component high-stability small open-circuit greenhouse gas analyzer.
Background
For flux monitoring of greenhouse gases, a vorticity correlation method is generally adopted, namely, a small open-type greenhouse gas analyzer and a three-position anemometer are combined to realize correlation calculation, and the small open-type greenhouse gas analyzer is a very critical ring and is required to ensure that the concentration change condition of the gas to be detected in an open area is effectively obtained in a quasi-real state.
However, most of the existing small open-circuit greenhouse gas analyzers adopt NDIR technology, the method adopts a broadband light source, is easy to be interfered by dust and other gases, and based on the consideration of sensitivity and miniaturization, more detection of CO2 and H2O is carried out by using NDIR, or detection of CH4 is realized by combining a TDLAS with a near infrared laser and a multiple reflection absorption cell, and the measurement component is single.
The analyzer also needs to be operated outdoors for a long time, in order to better measure vorticity information in practical application, the analyzer should reduce space shielding as much as possible, the analyzer is almost completely exposed to the atmosphere, the mode of combining the multiple reflection absorption tanks in the prior art is difficult to adapt to outdoor application for a long time, the light path deformation is easily caused by the influence of environmental factors, and the maintenance difficulty and cost are increased. The stability of the analyzer is equally susceptible to environmental factors (dust, rain, etc.) and system drift (including wavelength drift due to temperature and circuit noise) in the measurement mode of the non-multiple reflection absorption cell.
Disclosure of Invention
The invention aims to solve the defect of poor stability of a small open-circuit greenhouse gas analyzer in the prior art, and provides a multi-component high-stability small open-circuit greenhouse gas analyzer.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
the invention provides a multi-component high-stability small open-circuit greenhouse gas analyzer, which comprises a main end, an auxiliary end and a slave end, wherein the main end and the auxiliary end are connected by a plurality of hollow rods, and the slave end is fixed on the main end, wherein the main end is provided with a plurality of hollow rods, wherein the auxiliary end is provided with a plurality of hollow rods, and the hollow rods are arranged on the main end:
the main terminal comprises: drive control and detection processing circuit, first well infrared detector, locking gas pond, a plurality of well infrared DFB laser and a plurality of optical lens, wherein:
the drive control and detection processing circuit is used for controlling the temperature and current of the middle infrared DFB laser;
the plurality of optical lenses includes: the first beam splitter, the second beam splitter, the reflecting mirror with the hole in the center, the band-pass filter and the heating film are respectively used for splitting and reflecting laser beams, filtering optical noise and heating the filter.
The auxiliary end comprises: the device comprises a first reflecting mirror, a second reflecting mirror and an auxiliary end detector, wherein the auxiliary end detector is fixed in the middle of the auxiliary end, and the first reflecting mirror and the second reflecting mirror are fixed at two sides of the inside of the auxiliary end;
the light beam of the first laser is split by a first beam splitter, wherein a reflecting part is used for open measurement, passes through a bandpass filter, is reflected by a first reflecting mirror and a second reflecting mirror and then is detected and received by a first middle infrared detector, and a transmitting part passes through a locking gas tank after being reflected by the reflecting mirror with a hole in the center and the second beam splitter, and the inside of the locking gas tank is sealed with mixed gas with a certain concentration, so that the mixed gas finally reaches the second middle infrared detector;
the beam of the third laser is divided into two beams by a second beam splitter, the reflected beam is used for open detection, and the transmitted light passes through a locking gas tank and then reaches a second middle infrared detector;
the light beam of the second laser passes through the center small hole of the reflecting mirror with a hole in the center and then is coupled with the light beam of the third laser by utilizing the second beam splitter, and then the coupled light beam passes through the band-pass filter and then reaches the auxiliary end detector for signal detection, the optical signal is converted into an electric signal, and the electric signal passes through the hollow rod through the signal wire and then reaches the drive control and detection processing circuit for processing.
Preferably, the number of the mid-infrared DFB lasers is specifically 3, and the number is respectively: a first laser with a wavelength of 3.27um, a second laser with a wavelength of 4.26um and a third laser with a wavelength of 1.39um are used for measuring CH4, CO2 and H2O respectively.
Preferably, an air compressor and a motor are arranged in the slave end, an automatic filtering membrane rotating disc is arranged at the input end of the air compressor, the output end of the motor is connected with the input end of a telescopic rod, an air nozzle is fixed on the output end of the telescopic rod, one end of a multipath air pipe is connected to the input end of the air nozzle, and the other end of the multipath air pipe is connected to the output end of the air compressor.
Preferably, a plurality of hole sites are formed in the automatic filtering membrane rotating disc, and a filtering membrane is arranged in the hole sites.
The multi-component high-stability small open-circuit greenhouse gas analyzer provided by the invention has the beneficial effects that:
1. the miniaturized synchronous frequency division detection and synchronous wavelength calibration of CH4, CO2 and H2O are realized through the combination of the light path design and the circuit of the master end and the slave end;
2. greatly improves the stability of the system: the heating paste is added on the main-end optical filter, so that the occurrence of condensed water can be well avoided, and the stability is improved; three paths of synchronous locking are realized, the real-time accurate locking of the wavelength is realized, and the stability is improved; the number of slave ends is increased to realize automatic purging and cleaning of the lenses of the main end and the auxiliary end, so that the stability is improved; the circuit has the advantages that the light intensity self-adaptive adjusting function is added, and the problem that detection is affected by weaker signals caused by the external environment is solved.
Drawings
FIG. 1 is a schematic diagram of a multi-component highly stable small open-circuit greenhouse gas analyzer according to the present invention.
FIG. 2 is a schematic diagram of a multi-component highly stable small open-circuit greenhouse gas analyzer according to the present invention.
FIG. 3 is a schematic view of the structure of the slave end of a multi-component highly stable small open-circuit greenhouse gas analyzer according to the present invention.
FIG. 4 is a plot of the sine signal of the frequency division modulation of the laser of the multi-component highly stable small open-circuit greenhouse gas analyzer according to the present invention.
In the figure:
master 1: the device comprises a first laser 101, a first beam splitter 102, a reflecting mirror 103 with a hole in the center, a second laser 104, a second beam splitter 105, a locking gas tank 106, a second middle infrared detector 107, a third laser 108, a first middle infrared detector 109, a heating film 110, a band-pass filter 111, a drive control and detection processing circuit 112;
secondary end 2: a first mirror 201, a second mirror 202, and a sub-end detector 203;
slave 3: a filtering membrane 301, an automatic filtering membrane rotating disc 302, an air compressor 303, a multi-channel air pipe 304, a telescopic rod 305 and a motor 306.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments.
Referring to fig. 1-2, the invention provides a miniaturized open-circuit greenhouse gas analyzer for multicomponent measurement, which consists of a main end 1, an auxiliary end 2 and an auxiliary end 3, wherein the main end 1 and the auxiliary end 2 are connected by a plurality of hollow rods 4, and the auxiliary end 3 is fixed on the main end 1.
The main end comprises 3 mid-infrared DFB lasers, a drive control and detection processing circuit 112, a plurality of optical lenses, a locking gas cell 106 and a first mid-infrared detector 109, wherein: the 3 mid-infrared DFB lasers are respectively: a first laser 101 with a wavelength of 3.27um, a second laser 104 with a wavelength of 4.26um and a third laser 108 with a wavelength of 1.39um are respectively used for synchronous high-sensitivity measurement of CH4, CO2 and H2O;
the driving control and detection processing circuit 112 is mainly used for precisely controlling the temperature and the current of the first laser 101, the second laser 104 and the third laser 108, in order to ensure the strict synchronous measurement of CH4, CO2 and H2O, 3 sine waves with different frequencies are generated by the driving control and detection processing circuit 112 to enable 3 middle infrared DFB lasers to realize frequency division modulation, and then frequency division demodulation processing is carried out on detection signals, so that the timeliness of synchronization can be ensured, the signal and noise interference among all channels are reduced, and the frequency and the amplitude of the frequency division modulated sine signals are as shown in fig. 4.
In addition, the driving control and detection processing circuit 112 has the functions of self-adaptive adjustment of signals and control of the slave, and the specific flow is as follows: the signal of the drive control and detection processing circuit 112 can be judged according to the light intensity signals of each path, when the light intensity signal is lower than a certain light intensity threshold value, the gain gear of the operational amplifier of the self-adaptive switching circuit can inhibit the amplification of noise to a certain extent, and meanwhile, the strength of useful signals is increased, the measurement is ensured, and the environmental adaptability is improved;
the plurality of optical lenses includes: the first beam splitter 102, the second beam splitter 105, the mirror 103 with a hole in the center, the band-pass filter 111, and the heating film 110 are used for splitting and reflecting a laser beam, filtering optical noise, heating the filter, and the like, respectively.
As shown in fig. 2, the specific workflow is: the light beam of the first laser 101 is split by the first beam splitter 102, wherein the reflecting part is used for open measurement, passes through the band-pass filter 111, is reflected by the first reflecting mirror 201 and the second reflecting mirror 202, is detected and received by the first middle infrared detector 109, and passes through the locking gas tank 106 after being reflected by the reflecting mirror 103 with a hole in the center and the second beam splitter 105, and the mixed gas with a certain concentration is sealed in the locking gas tank 106, and finally reaches the second middle infrared detector 107;
the beam of the third laser 108 is split into two beams by the second beam splitter 105, the reflected beam is used for open detection, and the transmitted light passes through the locking gas cell 106 and then reaches the second middle infrared detector 107;
the beam of the second laser 104 passes through the center aperture of the reflecting mirror 103 with a hole in the center, then is coupled with the beam of the third laser 108 by the second beam splitter 105, and then the coupled beam passes through the band-pass filter 111, and then reaches the secondary end detector 203 for signal detection, the optical signal is converted into an electrical signal, and the electrical signal passes through the hollow rod 4 through a signal wire and then reaches the drive control and detection processing circuit 112 for processing.
The filter 111 is added with the heating paste 110, so that condensed water can be better avoided, and stability is improved.
The locking pool 106 and the first middle infrared detector 109 are mainly used for the wavelength real-time calibration of three lasers, so that the system drift is reduced, and the stability is improved; the specific real-time detection CH4/CO2/H2O absorption peak position is compared with the target position, and the current value is modified according to a certain stepping value, so that the accurate wavelength calibration is realized.
As shown in fig. 3, the slave 3 mainly comprises an air compressor 303, a filtering membrane 301, an automatic filtering membrane rotating disc 302, a motor 306, a telescopic rod 305 and a multi-path air pipe 304, and is combined with the drive control and detection processing circuit 112 to realize self-adaptive adjustment of signals and automatic purging of lenses.
The specific working flow is as follows: the automatic purging and cleaning of the lens can be realized through a timing treatment mode, namely, the air compressor 303 is controlled to be started in a fixed time period in the middle of a day, the inlet of the air compressor 303 is connected with the automatic filtering membrane rotating disc 302, the automatic filtering membrane rotating disc 302 is provided with a filtering membrane, dust and H2O can be filtered, the outlet of the compressor is clean air, the automatic filtering membrane rotating disc 302 comprises a plurality of hole sites, the filtering membrane 301 is installed, the fixed time interval is set for 1-2 months, the automatic rotation is carried out, and the automatic filtering membrane is replaced with a new filtering membrane 301 without frequent maintenance.
After the air compressor 303 is started, the control motor 306 drives the telescopic rod 305, a plurality of air nozzles in different directions are arranged on the telescopic rod 305, one end of the multipath air pipe 304 is connected with the output end of the air compressor 303, the other end of the multipath air pipe is connected with the input end of the air nozzle, compressed air is automatically purged and cleaned to the lenses at the main end 1 and the auxiliary end 2 through the air nozzle, and the stability and the environmental adaptability of the system are improved.
The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art, who is within the scope of the present invention, should make equivalent substitutions or modifications according to the technical scheme of the present invention and the inventive concept thereof, and should be covered by the scope of the present invention.
Claims (4)
1. The utility model provides a small-size greenhouse gas analyzer that opens a way of multicomponent high stability, includes main end (1), vice end (2) and from end (3), is connected by a plurality of hollow poles (4) between main end (1) and the vice end (2), and from end (3) are fixed on main end (1), its characterized in that:
the main terminal (1) comprises: the device comprises a drive control and detection processing circuit (112), a first mid-infrared detector (109), a locking gas cell (106), a plurality of mid-infrared DFB lasers and a plurality of optical lenses, wherein:
the drive control and detection processing circuit (112) is used for controlling the temperature and the current of the middle infrared DFB laser;
the plurality of optical lenses includes: the device comprises a first beam splitter (102), a second beam splitter (105), a reflecting mirror (103) with a hole in the center, a band-pass filter (111) and a heating film (110), which are respectively used for splitting and reflecting laser beams, filtering optical noise and heating the filter;
the secondary end (2) comprises: the device comprises a first reflecting mirror (201), a second reflecting mirror (202) and an auxiliary end detector (203), wherein the auxiliary end detector (203) is fixed in the middle of an auxiliary end (2), and the first reflecting mirror (201) and the second reflecting mirror (202) are fixed on two sides of the inside of the auxiliary end (2);
the beam of the first laser (101) is split by a first beam splitter (102), wherein a reflecting part is used for open measurement, passes through a bandpass filter (111), is reflected by a first reflecting mirror (201) and a second reflecting mirror (202) and then is detected and received by a first middle infrared detector (109), a transmitting part passes through a locking gas tank (106) after being reflected by the reflecting mirror (103) with a hole in the center and the second beam splitter (105), and mixed gas with a certain concentration is sealed in the locking gas tank (106) and finally reaches a second middle infrared detector (107);
the light beam of the third laser (108) is divided into two beams by a second beam splitter (105), the reflected light beam is used for open detection, and the transmitted light passes through a locking gas tank (106) and then reaches a second middle infrared detector (107);
the beam of the second laser (104) passes through the center small hole of the reflecting mirror (103) with a hole in the center and then is coupled with the beam of the third laser (108) by utilizing the second beam splitting mirror (105), and then the coupled beam passes through the band-pass filter (111) and then reaches the auxiliary end detector (203) for signal detection, the optical signal is converted into an electric signal, and the electric signal passes through the hollow rod (4) through the signal wire and then reaches the drive control and detection processing circuit (112) for processing.
2. The multi-component highly stable small open-circuit greenhouse gas analyzer of claim 1, wherein the number of mid-infrared DFB lasers is specifically 3, each of which is: a first laser (101) with a wavelength of 3.27um, a second laser (104) with a wavelength of 4.26um and a third laser (108) with a wavelength of 1.39um are used for the measurement of CH4, CO2 and H2O, respectively.
3. The multi-component high-stability small open-circuit greenhouse gas analyzer according to claim 1, wherein an air compressor (303) and a motor (306) are arranged in the slave end (3), an automatic filtering membrane rotating disc (302) is arranged at the input end of the air compressor (303), the output end of the motor (306) is connected with the input end of a telescopic rod (305), an air nozzle is fixed on the output end of the telescopic rod (305), one end of a multi-channel air pipe (304) is connected to the input end of the air nozzle, and the other end of the multi-channel air pipe is connected to the output end of the air compressor (303).
4. The multicomponent high stable small open-circuit greenhouse gas analyzer according to claim 3, wherein a plurality of hole sites are formed on the automatic filter membrane rotating disc (302), and a filter membrane (301) is installed in the hole sites.
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