CN117969452A - Open cavity ring-down natural gas concentration detection device - Google Patents
Open cavity ring-down natural gas concentration detection device Download PDFInfo
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- CN117969452A CN117969452A CN202211315897.8A CN202211315897A CN117969452A CN 117969452 A CN117969452 A CN 117969452A CN 202211315897 A CN202211315897 A CN 202211315897A CN 117969452 A CN117969452 A CN 117969452A
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 98
- 239000003345 natural gas Substances 0.000 title claims abstract description 49
- 238000001514 detection method Methods 0.000 title claims abstract description 40
- 239000007789 gas Substances 0.000 claims abstract description 83
- 238000012545 processing Methods 0.000 claims abstract description 13
- 230000008859 change Effects 0.000 claims abstract description 7
- 238000002955 isolation Methods 0.000 claims abstract description 6
- 230000001681 protective effect Effects 0.000 claims abstract description 6
- 230000003287 optical effect Effects 0.000 claims description 20
- 238000001914 filtration Methods 0.000 claims description 4
- 238000010521 absorption reaction Methods 0.000 description 9
- 238000000180 cavity ring-down spectroscopy Methods 0.000 description 9
- 238000005516 engineering process Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 238000005259 measurement Methods 0.000 description 5
- 239000000243 solution Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000002310 reflectometry Methods 0.000 description 3
- 230000003595 spectral effect Effects 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 229910000037 hydrogen sulfide Inorganic materials 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 239000013618 particulate matter Substances 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 238000001228 spectrum Methods 0.000 description 2
- 239000000443 aerosol Substances 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000035 biogenic effect Effects 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 239000002803 fossil fuel Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000013307 optical fiber Substances 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Abstract
The invention provides an open cavity ring-down natural gas concentration detection device, which is applied to the technical field of gas detection and comprises the following components: the light source is used for emitting incident light signals, the light path system comprises a front cavity mirror and a rear cavity mirror, an open cavity is formed between the front cavity mirror and the rear cavity mirror, the light path system is used for leading the incident light signals into the front cavity mirror, the rear cavity mirror is led out to obtain emergent light signals, the two air curtain structures are respectively arranged outside the front cavity mirror and the rear cavity mirror in a wrapping mode, the air curtain structures are used for forming protection isolation areas in front of the front cavity mirror and the rear cavity mirror, the air charging system is used for generating protective gas and charging the protective gas into the air curtain structures, the photoelectric detector is used for converting the emergent light signals into electric signals, the data acquisition unit is used for acquiring and recording the electric signals output by photoelectric detection, the data processing system is used for calculating the concentration of the natural gas in the gas to be detected based on the acquired electric signal change and the temperature and the pressure of the gas to be detected, and natural gas leakage can be detected simply and accurately.
Description
Technical Field
The invention relates to the technical field of gas detection, in particular to an open cavity ring-down natural gas concentration detection device.
Background
Natural gas is a type of combustible gas existing in nature, is a fossil fuel, and comprises various gases formed in natural processes in an atmosphere, a water ring and a rock ring (comprising oilfield gas, gas field gas, mudstone gas, coal bed gas, biogenic gas and the like), and plays an extremely important role in personal life and social development. With the development of modern science and technology, the use of gas is also increasing, but gas has a great danger, and high-precision concentration detection is required in the aspects of gas exploitation, gas transmission and gas use to ensure the safety of staff or users. Therefore, in daily maintenance, a technician is required to detect the gas concentration at all times.
The cavity ring-down spectroscopy (CRDS, cavity Ring Down Spectroscopy) uses the interaction mechanism between laser and gas molecules to detect the gas, and is a more common solution to the problem of natural gas detection at present. Besides the analysis and detection capability of the traditional spectrum technology, the method has the unique advantages that: because the laser has a plurality of round trips in the optical cavity and the absorption optical path length is long, the CRDS technology can obtain high sensitivity; in addition, the direct measurement parameters of the CRDS technology are not the absolute intensity change of the light intensity of the laser after passing through the substance to be measured, but the light intensity exponential decay rate, so the CRDS technology is insensitive to the fluctuation of the light source intensity.
Most of the prior art natural gas detection CRDS devices use a closed ring down cavity structure, and a pump is used to pump the gas to be detected into the closed ring down cavity formed by the high reflector. The closed structure is beneficial to controlling the pressure and temperature value of the gas to be measured, so as to determine the absorption section of the gas to be measured. However, in the rapid flux test based on the vehicle-mounted platform or the unmanned platform, the process of pumping the gas to be tested into the ring-down cavity can generate detection delay, so that the real-time performance and the space-time resolution of the detection are affected. In addition, uncontrollable factors such as gas or aerosol adhesion and the like often accompany the pumping process of the gas to be measured, so that measurement errors are generated.
Disclosure of Invention
The invention mainly aims to provide an open cavity ring-down natural gas concentration detection device which can simply, conveniently and accurately detect natural gas leakage.
To achieve the above object, a first aspect of an embodiment of the present invention provides an open cavity ring-down natural gas concentration detection apparatus, including:
the device comprises a light source, a light path system, two air curtain structures, an inflation system, a photoelectric detector, a data acquisition unit and a data processing system;
The light source comprises a laser, a laser driving module and a temperature control module, wherein the laser is used for emitting incident light signals, the laser driving module is used for providing working current and voltage required by the working of the laser, and the temperature control module is used for controlling the working temperature of the laser;
The optical path system comprises a front cavity mirror and a rear cavity mirror, an open cavity is formed between the front cavity mirror and the rear cavity mirror, the optical path system is used for leading the incident light signal in from the front cavity mirror and leading the rear cavity mirror out to obtain an emergent light signal, the incident light signal forms ring-down in the open cavity, and the gas to be detected is positioned in the open cavity;
The two air curtain structures are respectively wrapped outside the front cavity mirror and the rear cavity mirror and are used for forming a protection isolation area in front of the front cavity mirror and the rear cavity mirror;
the inflation system is used for inflating protective gas into the air curtain structure;
The photoelectric detector is used for converting the emergent light signal into an electric signal;
the data acquisition unit is used for acquiring and recording voltage signals output by the photoelectric detector;
the data processing system is used for calculating the concentration of the natural gas in the gas to be detected based on the collected electric signal change and the temperature and the pressure of the gas to be detected.
In an embodiment of the present invention, the data processing system is specifically configured to obtain a ring-down time of the natural gas by fitting a ring-down numerical curve of the intensity of the outgoing light, and obtain the concentration of the natural gas in the gas to be detected according to the temperature, the pressure and the ring-down time of the gas to be detected.
In an embodiment of the present invention, at least one exhaust through hole is formed on the air outlet channel of the air curtain structure.
In an embodiment of the present invention, a size of the air outlet channel of the air curtain structure gradually increases along the air outlet direction.
In an embodiment of the present invention, the shielding gas is the gas to be detected after being subjected to vapor drying and particulate matter filtering.
In an embodiment of the invention, the apparatus further comprises:
The mode matching lens group is arranged between the light source and the front cavity lens and is used for injecting light spots of optical signals into the center of the open cavity and matching with the cavity mode.
In an embodiment of the present invention, the mode matching lens group includes several lenses with different or same parameters.
In an embodiment of the invention, the apparatus further comprises:
The isolator is arranged between the pattern matching lens group and the front cavity mirror and is used for isolating reflected light reflected back to the light source by the open cavity.
In an embodiment of the invention, the apparatus further comprises:
The adjustable mirror frames are used for adjusting angles between the mirror surfaces of the front cavity mirror and the rear cavity mirror and incident light.
In an embodiment of the invention, the apparatus further comprises:
the filter is arranged between the rear cavity mirror and the photoelectric detector and is used for transmitting the emergent light signals and filtering stray light in the emergent light signals.
As can be seen from the above embodiments of the present invention, the open cavity ring-down natural gas concentration detection device provided by the present invention includes a light source, an optical path system, two air curtain structures, an air inflation system, a photoelectric detector, a data acquisition unit and a data processing system, where the light source is configured to emit an incident light signal, the optical path system includes a front cavity mirror and a rear cavity mirror, an open cavity is formed between the front cavity mirror and the rear cavity mirror, the optical path system is configured to enable the incident light signal to be led in from the front cavity mirror, the rear cavity mirror is led out to obtain an outgoing light signal, the incident light signal forms a ring-down in the open cavity, a gas to be detected is located in the open cavity, the two air curtain structures are respectively wrapped outside the front cavity mirror and the rear cavity mirror, the air curtain structures are configured to form a protection isolation area in front of the front cavity mirror and the rear cavity mirror, the air inflation system is configured to charge a protection gas into the air curtain structures, the photoelectric detector is configured to convert the outgoing light signal into an electrical signal, the data acquisition unit is configured to acquire and record the electrical signal output, the electrical signal is processed, and the data acquisition unit is configured to calculate the temperature change of the gas to be detected, and the temperature change is calculated based on the gas concentration.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are necessary for the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention and that other drawings may be obtained from them without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of an open cavity ring-down natural gas concentration detection apparatus according to an embodiment of the present invention;
Fig. 2 is a schematic diagram of an air curtain structure and a front cavity mirror according to an embodiment of the present invention.
Detailed Description
In order to make the objects, features and advantages of the present invention more comprehensible, the technical solutions in the embodiments of the present invention will be clearly described in conjunction with the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1, fig. 1 is a schematic structural diagram of an open cavity ring-down natural gas concentration detection device according to an embodiment of the present invention, where the open cavity ring-down natural gas concentration detection device provided by the present invention may be applied to a vehicle-mounted, on-board, fixed-point arrangement or simple mobile device, to detect a gas to be detected passing through an open cavity, and calculate a natural gas concentration at a point in combination with a weather condition of a test point. The device mainly comprises:
The device comprises a light source 1, a light path system, two air curtain structures 2 and 3, an inflation system 4, a photoelectric detector 5, a data acquisition unit 6 and a data processing system 7;
The light source 1 is used for emitting an incident light signal;
The optical path system comprises a front cavity mirror 8 and a rear cavity mirror 9, an open cavity is formed between the front cavity mirror 8 and the rear cavity mirror 9, the optical path system is used for leading the incident light signal in from the front cavity mirror 8 and leading out the rear cavity mirror 9 to obtain an emergent light signal, wherein the incident light signal forms ring-down in the open cavity, and the natural gas to be detected is positioned in the open cavity;
The two air curtain structures 2 and 3 are respectively wrapped outside the front cavity mirror 8 and the rear cavity mirror 9, and the air curtain structures 2 and 3 are used for forming a protection isolation area in front of the front cavity mirror 8 and the rear cavity mirror 9;
An inflation system 4 for inflating the curtain structures 2 and 3 with a protective gas;
The photodetector 5 is used for converting the emergent light signal into an electric signal;
The data acquisition unit 6 is used for acquiring and recording the electric signals output by photoelectric detection;
The data processing system 7 is used for calculating the concentration of the natural gas in the gas to be detected based on the acquired change of the emergent light intensity signal and the temperature and the pressure of the gas to be detected.
In the present invention, the light source 1 may be a single longitudinal mode laser.
In the invention, the front cavity mirror 8 and the rear cavity mirror 9 are high reflection mirrors, and the two high reflection mirrors are fixed at two ends of the open cavity in parallel and opposite. An open cavity is formed between the front cavity mirror 8 and the rear cavity mirror 9, optical signals are reflected between the front cavity mirror 8 and the rear cavity mirror 9 for multiple times, effective absorption optical paths are increased, detection accuracy is improved, and meanwhile, a gas natural exchange mode is adopted, so that a closed ring-down cavity is not needed.
In the present invention, the data processing system 7 also includes line broadening problems due to variations in the temperature, pressure, etc. of the natural gas to be detected in the open cavity. In contrast, in the whole open cavity ring-down natural gas concentration detection device, the theoretical spectral line under different gas temperatures and pressures is compared with the spectral line obtained under the sweep frequency, an automatic matching algorithm is applied, and the theoretical absorption section corresponding to the ring-down maximum value measured under the physical factors such as the temperature, the pressure and the like is obtained, so that the influence of the spectral line broadening on measurement is overcome, and the measurement result is stabilized.
In the present invention, the air curtain structures 2 and 3 form a protective isolation area in front of the endoscope to prevent the endoscope from being damaged by contamination.
The invention can be used for detecting other gases besides natural gas in the gas to be detected in the atmosphere, but has slight differences for different gas devices. For example, for hydrogen sulfide gas, the open cavity reduces the gas light path, simplifies the sample injection device, and can reduce the influence of the adhesion on detection. Optionally, as shown in fig. 1, an optical switch 14 may be further disposed in front of the open cavity, and the optical switch may be an acousto-optic controller or an electro-optic controller, and is used for modulating the frequency of the optical signal injected into the open cavity, that is, functioning as an optical path switch.
In an embodiment of the present invention, the data processing system 7 is specifically configured to obtain a ring-down time of the natural gas by fitting a ring-down numerical curve of the intensity of the outgoing light, and obtain the concentration of the natural gas to be detected according to the incoming light signal and the ring-down time.
In the present invention, the open cavity is comprised of a pair of parallel opposing high reflective mirrors with a radius of curvature R and a reflectivity R. When the vacuum cavity is not filled with gas, the incident light source 1 is turned off, and the light emergent side of the cavity can detect the light intensity I=I 0exp(k(ν)L)＝I0 exp (-t/tau (v)).
Wherein I is the intensity of the emergent light of the open cavity, I 0 is the intensity of the incident light, L is the length of the open cavity, t is the charging time, and τ is the ring-down time. For a vacuum chamber, the ring down time size depends only on the physical characteristics of the chamber, the open chamber length L, and the reflectivity R.
For typical values of R > 0.999, τ 0 can be approximated as τ 0 (v) =l/clnr=l/(1-R). When the cavity is filled with natural gas to be detected, the attenuation rate is accelerated due to the absorption loss of the natural gas to be detected, the ring-down time is τ (v) =l/c (1-r+α (v) d), wherein α (v) is an absorption coefficient related to frequency, and d is the length of single laser transmission in the cavity.
Thus, the absorption coefficient α (v) can be expressed as: wherein delta (v) is the absorption cross section of the gas to be measured, N is the concentration of the gas to be measured,
Thus, the gas concentration can be expressed as:
According to the above formula, the CRDS ring-down time is only related to the reflectivity of the cavity mirror and the equivalent absorption coefficient, and is not related to the incident light intensity, which is also the difference between the CRDS technology and other measuring devices, and is not affected by the intensity fluctuation of the incident laser. This measured characteristic of velocity rather than intensity eliminates the need for calibration or comparison of the cavity ring-down spectrum to an external standard.
In one embodiment of the present invention, at least one exhaust through hole is formed in the air outlet channels of the air curtain structures 2 and 3. As shown in fig. 2, the upper and lower exhaust holes are added at the air outlets of the air curtain structures 2 and 3 for outputting the shielding gas, so that the problem that the natural gas to be detected is diluted due to the output of the shielding gas from the positive air outlet is avoided. The air curtain structures 2 and 3 are applied to a front cavity mirror 8 and a rear cavity mirror 9.
In an embodiment of the present invention, the sizes of the air outlet channels of the air curtain structures 2 and 3 are gradually increased along the air outlet direction, so that the air chamber pressure is higher than the atmospheric pressure; in addition, in the case of the optical fiber,
In an embodiment of the present invention, the shielding gas and the gas to be detected are the same source gas, and the shielding gas is subjected to vapor drying and particulate matter filtering, so as to reduce the influence of the injected gas on the measurement of the concentration of the natural gas in the gas to be detected.
In one embodiment of the present invention, the apparatus further comprises: the pattern matching lens group 10 is arranged between the light source 1 and the front cavity lens 8, and the pattern matching lens group 10 is used for injecting light spots of optical signals into the center of the open cavity and matching with cavity patterns, so that the detection precision is improved.
In one embodiment of the present invention, the pattern matching lens assembly 10 includes a plurality of lenses of different or identical parameters.
In one embodiment of the present invention, the apparatus further comprises: the isolator 11 is disposed between the mode matching lens group and the front cavity mirror 8, and the isolator 11 is used for isolating the reflected light reflected by the open cavity back to the light source 1, so as to ensure the stability of the incident light signal emitted by the light source 1.
Optionally, a collimator 12 may be further disposed between the light source 1 and the pattern matching lens set 10, for collimating an incident light signal and collimating an input light signal output by the light source 1.
In one embodiment of the present invention, the apparatus further comprises: two adjustable mirror holders, in one of which the front and rear mirrors 8 and 9 are disposed, are used to adjust the angle between the mirror surfaces of the front and rear mirrors 8 and 9 and the incident light.
In one embodiment of the present invention, the apparatus further comprises: the filter 13 is disposed between the rear cavity mirror 9 and the photodetector 5, and is configured to transmit the outgoing light signal and filter stray light in the outgoing light signal.
The invention can be applied to vehicle-mounted, airborne, fixed-point arrangement or simple mobile devices, and is used for safety inspection and leakage detection of natural gas storage places, use places, transportation facilities and the like.
The invention is applied to a vehicle-mounted, on-board, fixed-point arrangement or simple mobile device, and is used for detecting the gas passing through the open cavity and calculating the gas concentration of the natural gas at the point by combining the climate conditions of the test point. The invention is used for natural gas pipeline inspection and leakage detection by virtue of the characteristics of high detection speed, high detection precision, wide detection range and the like.
The method can be used for detecting other gases besides natural gas in the atmosphere, but has slight differences for different gas devices. For example, for hydrogen sulfide gas, it has a strong adhesion, so that the use of a conduit can be reduced and the gas input device can be simplified in the design of the detecting device.
It should be noted that, each functional module in each embodiment of the present disclosure may be integrated into one processing module, or each module may exist alone physically, or two or more modules may be integrated into one module. The integrated modules may be implemented in hardware or in software functional modules.
The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such an understanding, the technical solution of the invention may be embodied essentially or partly in the form of a software product or in part in addition to the prior art.
It should be noted that, for the sake of simplicity of description, the foregoing method embodiments are all expressed as a series of combinations of actions, but it should be understood by those skilled in the art that the present invention is not limited by the order of actions described, as some steps may be performed in other order or simultaneously in accordance with the present invention. Further, those skilled in the art will appreciate that the embodiments described in the specification are all preferred embodiments, and that the acts and modules referred to are not necessarily all required for the present invention.
In the foregoing embodiments, the descriptions of the embodiments are emphasized, and for parts of one embodiment that are not described in detail, reference may be made to the related descriptions of other embodiments.
The foregoing is illustrative of an open cavity ring-down natural gas concentration detection apparatus provided by the present invention, and it is not to be construed as limiting the invention to all extent possible, as modifications in the detailed description and the application are intended to be within the scope of the invention as defined by the appended claims.
Claims (10)
1. An open cavity ring down natural gas concentration detection apparatus, comprising:
the device comprises a light source, a light path system, two air curtain structures, an inflation system, a photoelectric detector, a data acquisition unit and a data processing system;
The light source comprises a laser, a laser driving module and a temperature control module, wherein the laser is used for emitting incident light signals, the laser driving module is used for providing working current and voltage required by the working of the laser, and the temperature control module is used for controlling the working temperature of the laser;
The optical path system comprises a front cavity mirror and a rear cavity mirror, an open cavity is formed between the front cavity mirror and the rear cavity mirror, the optical path system is used for leading the incident light signal in from the front cavity mirror and leading the rear cavity mirror out to obtain an emergent light signal, the incident light signal forms ring-down in the open cavity, and the gas to be detected is positioned in the open cavity;
The two air curtain structures are respectively wrapped outside the front cavity mirror and the rear cavity mirror and are used for forming a protection isolation area in front of the front cavity mirror and the rear cavity mirror;
the inflation system is used for inflating protective gas into the air curtain structure;
The photoelectric detector is used for converting the emergent light signal into an electric signal;
The data acquisition unit is used for acquiring and recording the electric signals output by the photoelectric detector;
the data processing system is used for calculating the concentration of the natural gas in the gas to be detected based on the collected electric signal change and the temperature and the pressure of the gas to be detected.
2. The open cavity ring down natural gas detection device of claim 1, wherein the data processing system is specifically configured to obtain a ring down time of the natural gas by fitting a ring down numerical curve of the intensity of the outgoing light, and obtain a concentration of the natural gas in the gas to be detected according to the temperature, the pressure, and the ring down time of the gas to be detected.
3. The open cavity ring down natural gas detection device of claim 1, wherein the gas outlet channel of the gas curtain structure is provided with at least one gas outlet through hole.
4. The open cavity ring down natural gas detection device of claim 2, wherein the size of the gas exit channel of the gas curtain structure increases gradually in the gas exit direction.
5. The open cavity ring down natural gas detection device of claim 1, wherein the shielding gas is the gas to be detected that has been moisture dried and particulate filtered.
6. The open cavity ring down natural gas detection device of claim 1, further comprising:
The mode matching lens group is arranged between the light source and the front cavity lens and is used for injecting light spots of optical signals into the center of the open cavity and matching with the cavity mode.
7. The open cavity ring down natural gas detection device of claim 6, wherein the pattern matching lens group comprises a plurality of lenses of different or same parameters.
8. The open cavity ring down natural gas detection device of claim 1, further comprising:
The isolator is arranged between the pattern matching lens group and the front cavity mirror and is used for isolating reflected light reflected back to the light source by the open cavity.
9. The open cavity ring down natural gas detection device of claim 1, further comprising:
The adjustable mirror frames are used for adjusting angles between the mirror surfaces of the front cavity mirror and the rear cavity mirror and incident light.
10. The open cavity ring down natural gas detection device of claim 1, further comprising:
the filter is arranged between the rear cavity mirror and the photoelectric detector and is used for transmitting the emergent light signals and filtering stray light in the emergent light signals.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211315897.8A CN117969452A (en) | 2022-10-26 | 2022-10-26 | Open cavity ring-down natural gas concentration detection device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211315897.8A CN117969452A (en) | 2022-10-26 | 2022-10-26 | Open cavity ring-down natural gas concentration detection device |
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| CN202211315897.8A Pending CN117969452A (en) | 2022-10-26 | 2022-10-26 | Open cavity ring-down natural gas concentration detection device |
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