CN103063368B - Monitoring system of sulfur hexafluoride (SF6) gas leakage - Google Patents
Monitoring system of sulfur hexafluoride (SF6) gas leakage Download PDFInfo
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- CN103063368B CN103063368B CN201210560761.3A CN201210560761A CN103063368B CN 103063368 B CN103063368 B CN 103063368B CN 201210560761 A CN201210560761 A CN 201210560761A CN 103063368 B CN103063368 B CN 103063368B
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Abstract
The invention discloses a monitoring system of sulfur hexafluoride (SF6) gas leakage. The monitoring system of the SF6 gas leakage comprises a host machine part, a remote terminal part and a signal transmission part, wherein the host machine part comprises a laser emission module, a gas signal reception module and a gas signal processing module. The remote terminal part comprises at least one remote terminal unit. Each remote terminal unit comprises a laser source, a laser detector and a gas measuring unit. The signal transmission part comprises a forward direction laser transmission module and a gas detection pass back module. Compared with the prior art, the monitoring system of the SF6 gas leakage can veritably monitor the leakage condition of the SF6 of the monitored point, automatic monitoring of the SF6 gas leakage is achieved, and the time of patrol and overhaul of workers on site are reduced.
Description
Technical field
The present invention relates to the detection field of electrical equipment, particularly one is for detecting sulfur hexafluoride (SF in electrical equipment
6) detection system of Leakage Gas.
Background technology
SF
6as the electric insulation medium of a new generation, there is superpower insulating capacity and arc extinguishing ability, and there is noncombustibility, first use in isolating switch and combined electrical apparatus in the sixties in 20th century, expand in recent years and be applied to transformer, cable etc., SF
6air insulating device, comprises transformer, isolating switch, mutual inductor, GIS (gas-insulating and fully-enclosed combined electrical apparatus), has become the main development direction of high-tension apparatus.
Be applied to SF at present
6the analytical approach of electrical equipment malfunction gas mainly contains vapor-phase chromatography, gas chromatography-mass spectrum is used in conjunction method, infra-red sepectrometry, electrochemical methods, chemical staining method etc.
Sonic method utilizes sound wave at SF
6the slow-footed feature that the velocity ratio propagated in gas is propagated in an atmosphere, detects, and its sensitivity detecting SF Leakage Gas is low; And be only suitable for leakage location, zonule, be not suitable for large area on-line monitoring.Electrochemical gas sensor is the concentration detecting gas by detecting electric current, is a kind of non-dedicated SF
6detect use, be not suitable for long-time on-line monitoring.Ultraviolet ionization method adds certain material, utilizes SF
6gas absorption characteristic, detect the concentration of adsorbate, its detection sensitivity is high, but adds particular matter due to needs, is not suitable for on-line monitoring.Electron capture method utilizes SF
6the electronegativity of gas, i.e. SF
6gas molecule can catch the characteristic of free movement electronics to measure SF
6the concentration of gas.This method highly sensitive; But measuring equipment volume is large, is only suitable for laboratory high precision test, is not suitable for large area on-line monitoring.One is also had to measure SF by absorption spectrum
6the method of Leakage Gas.Because gas atom has fixing spectral absorption characteristics, therefore can measure by spectrographic technique.In this approach, usually need, by radiating laser beams in gas, then to analyze the signal of receiving end.Typical Representative is laser imaging method, namely utilizes SF
6gas, to the strong absorption characteristic of a certain infrared spectrum, carries out light spectrum image-forming to realize the qualitative detection of SF Leakage Gas to search coverage.This laser imaging method is highly sensitive, but being only suitable for zonule leaks location, is not suitable for large area on-line monitoring.
Above method mostly can only at needs monitoring SF
6the monitoring point Site Detection SF of Leakage Gas
6leakage Gas; Or need that the band of monitoring point is detected gas to be extracted in a closed container, closed container is taken back laboratory and measures.Because multiple electrical equipment is usually distributed in a larger geographic range, if desired to the SF of multiple electrical equipment
6leakage Gas is monitored, traditional SF
6gas leak detection method all needs staff to process to scene, monitoring point at every turn.Therefore in order to improve SF
6the work efficiency of Leakage inspection, needs one can patrol and examine to scene without the need to staff, and can simultaneously to the SF of multiple diverse geographic location
6leakage Gas carries out the method detected.
Summary of the invention
In order to overcome the above-mentioned shortcoming of prior art with not enough, the object of the present invention is to provide a kind of SF
6leakage Gas monitoring system, can carry out remote online monitoring to multiple monitoring point.
Object of the present invention is achieved through the following technical solutions:
A kind of SF
6leakage Gas monitoring system, comprises host machine part, remote terminal part and Signal transmissions part,
Described host machine part comprises laser emitting module, gas signal receiver module, gas signal processing module;
Described remote terminal part comprises at least one remote-terminal unit; Each remote-terminal unit comprises lasing light emitter, laser detector and gas measurement unit;
Described Signal transmissions part comprises forward Laser Transmission module and gas detect signal return module;
The laser of the specific wavelength launched is passed through the lasing light emitter of forward Laser Transmission module transfer to remote-terminal unit by described laser emitting module, the laser of specific wavelength is sent in gas measurement unit by lasing light emitter, and the laser of specific wavelength is received by laser detector through after gas measurement unit; The laser energy detected is converted to electric signal by laser detector, is called gas detection signals; Gas detection signals is sent to gas signal receiver module by gas detection signals passback module, and is processed gas detection signals by gas signal processing module, judges whether to there is SF
6leakage Gas;
Described specific wavelength is SF
6the peak absorbtivity wavelength of gas.
Further, described laser emitting module comprises laser instrument, focus set and laser couplers, and the laser generated from laser instrument is focused on by focus set; Again by laser couplers by focus on after laser coupled in optical fiber.
Further, described laser emitting module also comprises power controller, for controlling the laser power that laser instrument generates.
Described gas detection signals is sent to gas signal receiver module by gas detection signals passback module, be specially: the gas detection signals from remote-terminal unit increases mark by gas signal receiver module, be called the markd gas detection signals of band, the corresponding remote-terminal unit of each mark; Gas signal receiver module receives the electric signal of multiple remote-terminal unit simultaneously, or receives the gas detection signals of multiple remote-terminal unit respectively according to time series mode.
Further, described gas signal processing module comprises
Signal pre-processing module, for carrying out filtering process to gas detection signals;
Characteristic extracting module, for extracting characteristic to gas detection signals after pretreatment;
Signal comparison module, for characteristic and the SF prestored of the gas to be measured by extraction
6gas characteristic data are carried out feature and are compared.
Preferably, described gas measurement unit is a porose container, and lasing light emitter, laser detector are separately fixed at the two ends of porose container; From lasing light emitter, laser is out received by laser detector after porose container, is the gas detection signals of gas to be measured;
The gas detection signals of described gas to be measured is sent to gas signal receiver module by gas detection signals passback module, increases mark, then be sent to gas signal processing module by gas signal receiver module.
Preferably, described gas measurement unit is full of the airtight container of reference gas, a porose container and a light-dividing device by one and forms; Described laser detector is made up of the first laser detector and the second laser detector; Light-dividing device is fixed on one end of airtight container, porose container, and the first laser detector is fixed on the other end of airtight container, and the second laser detector is fixed on the other end of porose container; Lasing light emitter is fixed on the side of light-dividing device;
From lasing light emitter, laser is out divided into two bundle laser of phase co-wavelength through light-dividing device, is wherein a branch ofly received by the first laser detector after airtight container, as with reference to signal; Another bundle is received by the second laser detector after porose container, is the gas detection signals of gas to be measured;
The gas detection signals of described reference signal and gas to be measured is sent to gas signal receiver module by gas detection signals passback module, increases mark, then be sent to gas signal processing module by gas signal receiver module.
Described laser detector is also connected with detection sensitivity adjusting gear, for adjusting the sensitivity of the laser energy that laser detector receives.
Described forward Laser Transmission module comprises optical fiber, optical splitter, and laser beam is linked in the lasing light emitter of multiple remote-terminal unit by described optical splitter;
Laser beam is linked into the mode of the lasing light emitter of multiple remote-terminal unit for accessing or access in serial fashion simultaneously by described optical splitter.
Described forward Laser Transmission module also comprises laser energy multiplying arrangement, and described laser energy multiplying arrangement is for increasing the energy from optical splitter laser beam out.
Compared with prior art, the present invention has the following advantages and beneficial effect:
1, SF of the present invention
6the laser signal of Leakage Gas monitoring system adopts Optical Fiber Transmission mode, and laser signal is directly sent to monitoring point, does not need the gas collecting in region to be monitored or pumps to other position, can monitor the SF of point being monitored truly
6leakage situation, can realize SF
6the automatic monitoring of Leakage Gas situation, maintenance number of times is maked an inspection tour at the scene decreasing staff.
2, SF of the present invention
6leakage Gas monitoring system can adopt single or multiple remote-terminal unit to measure laser energy signal in monitoring point, by the comparison process between multiple laser energy signal, can improve SF
6the stability of gas detect.
3, SF of the present invention
6leakage Gas monitoring system utilizes SF
6gas absorption spectra characteristic, adopts the laser of specific wavelength (1050nm ~ 1060nm) as SF
6the medium of gas detect, SF
6the accuracy of Leakage inspection is improved significantly.
Accompanying drawing explanation
Fig. 1 is the SF of embodiment 1
6the composition schematic diagram of Leakage Gas monitoring system.
Fig. 2 is the gas measurement unit schematic diagram of embodiment 1.
Fig. 3 is the gas measurement unit schematic diagram of embodiment 2.
Embodiment
Below in conjunction with embodiment, the present invention is described in further detail, but embodiments of the present invention are not limited thereto.
Embodiment 1
As shown in Figure 1, the SF of the present embodiment
6leakage Gas monitoring system, comprises host machine part, remote terminal part and Signal transmissions part.Described host machine part comprises laser emitting module, gas signal receiver module, gas signal processing module; Described remote terminal part comprises at least one remote-terminal unit; Each remote-terminal unit comprises lasing light emitter, laser detector and gas measurement unit; Described Signal transmissions part comprises forward Laser Transmission module and gas detect signal return module.
The laser of the specific wavelength launched is passed through the lasing light emitter of forward Laser Transmission module transfer to remote-terminal unit by described laser emitting module, the laser of specific wavelength is sent in gas measurement unit by lasing light emitter, and the laser of specific wavelength is received by laser detector through after gas measurement unit; The laser energy detected is converted to electric signal by laser detector, is called gas detection signals; Gas detection signals is sent to gas signal receiver module by gas detection signals passback module, and is processed gas detection signals by gas signal processing module, judges whether to there is SF
6leakage Gas.
1, host machine part
1.1 laser emitting module
Laser emitting module comprises laser instrument, focus set and laser couplers, and the laser generated from laser instrument is focused on by focus set; Again by laser couplers by focus on after laser coupled in optical fiber.The laser of specific wavelength refers to SF
6the peak absorbtivity wavelength of gas, the laser namely near 1055nm.Specifically, the wavelength peak of the laser emitted exactly is the laser near 1055nm, and such as wavelength coverage is the laser of 1050nm ~ 1060nm.
1.2 gas signal receiver modules
Gas signal receiver module can receive SF by multiple diverse ways
6gas detection signals, such as wire transmission network Received signal strength or wireless-transmission network.Need a receiving trap, as network interface card, modulator-demodular unit etc. carry out receiver gases detection signal.A receiving trap can receive the signal of multiple separate sources simultaneously.
Gas signal receiver module can receive the gas detection signals from multiple remote-terminal unit.As the gas detection signals received from remote-terminal unit 1, remote-terminal unit 2 and remote-terminal unit N increases mark by gas signal receiver module, the corresponding remote-terminal unit of each mark, be called the markd gas detection signals of band, such as the gas detection signals of remote-terminal unit 1, remote-terminal unit 2 and remote-terminal unit N is marked as S1, S2 and SN respectively.
Gas signal receiver module can receive the gas detection signals of multiple separate sources simultaneously, such as, receive S1, S2 and SN simultaneously; Also can receive the gas detection signals of separate sources according to time series mode respectively, such as, first receive S2, after waiting S2 signal data to receive, then receive S1, after waiting S1 signal data to receive, finally receive the signal data of SN.
Being with markd gas detection signals, such as S1, S2 and SN, can be the laser energy signal of gas to be detected, also can be laser energy signal and the reference laser energy signal of gas to be detected.Laser energy signal is the numerical signal representing the energy size that laser comprises.The energy size that laser after the laser energy signal of gas to be detected is through gas absorption to be detected comprises.Such as, the laser energy signal that the band in S1, S2 and SN detects gas is expressed as S1_test, S2_test and SN_test.
1.3 gas signal processing modules comprise signal pre-processing module, characteristic extracting module and signal comparison module.
1.3.1 signal pre-processing module, for carrying out filtering process to gas detection signals, the interfere information in filtering gas detection signals.These interfere informations may from the data movement in signals transmission, or due to other non-SF in gas signal testing process
6the interference that gas causes, or due to other interference in gas signal testing process.By filtering interfering information, SF can be improved
6the accuracy of detection of gas signal.
1.3.2 characteristic extracting module, for extracting characteristic to gas detection signals after pretreatment; Characteristic signal includes but not limited to the peak value of signal intensity, signal duration, signal.Such as, after the gas detection signals being labeled as S1 processes after filtering, the S1_tes_filter obtained, the feature obtained after feature extraction is designated as F1_test.Characteristic signal is represented as one group of data sequence, and such as, F1_test is one group of data sequence.
1.3.3 signal comparison module, for characteristic and the SF prestored of the gas to be measured by extraction
6gas characteristic data are carried out feature and are compared.Feature comparative approach includes but not limited to related coefficient comparative approach, definitely value difference comparative approach, difference quadratic sum comparative approach etc., any the method for similarity system design is carried out to two groups of different pieces of information sequences can as feature comparative approach.If result of calculation exceedes certain threshold value, then judge SF
6gas detection signals and SF
6gas signal is similar, and SF has appearred in corresponding monitoring point
6leakage Gas.
2, remote terminal part
Remote terminal part comprises multiple remote-terminal unit; Each remote-terminal unit comprises lasing light emitter, laser detector and gas measurement unit.As shown in Figure 2, the gas measurement unit in the present embodiment is a porose container 11, and extraneous gas can be penetrated by the hole on gas measurement unit.If therefore there is SF gas measurement unit outside
6during gas, also there is SF the inside of gas detection cell
6gas.Lasing light emitter 12, laser detector 13 are separately fixed at the two ends of porose container 11.Lasing light emitter and laser detector are by accurate calibration, and make the laser launched by after gas measurement unit, can be aligned in the center of laser detector, laser energy as much as possible can be converted to electric signal by laser detector.The material of porose container can be glass, metal etc., can ensure SF
6gas can not be absorbed by this material or pass.
From lasing light emitter, laser is out received by laser detector after porose container, is the gas detection signals of gas to be measured; The gas detection signals of described gas to be measured is sent to gas signal receiver module by gas detection signals passback module, increases mark, then be sent to gas signal processing module by gas signal receiver module.
3, Signal transmissions part
Signal transmissions part comprises forward Laser Transmission module and gas detect signal return module.
3.1 forward Laser Transmission modules comprise optical fiber, optical splitter, and the specific wavelength being responsible for laser emitting module to emit is sent to remote terminal part by optical fiber.
Laser beam is linked in the lasing light emitter of multiple remote-terminal unit by optical splitter.The laser emitting module laser launched and the laser entering into lasing light emitter are all the laser of same specific wavelength, and just laser energy exists different.Laser beam can be linked in multiple remote-terminal unit by optical splitter simultaneously, also laser can be linked in multiple remote-terminal unit in serial fashion.
3.2 gas detection signals passback modules are sender unit, are responsible for the SF transmitted by laser detector
6gas detection signals is sent to host machine part.SF can be transmitted by multiple diverse ways
6gas detection signals, such as wire transmission network Received signal strength or wireless-transmission network.Therefore need a dispensing device, as network interface card, modulator-demodular unit etc., send SF
6gas detection signals.
Embodiment 2
The present embodiment is except following characteristics, and all the other features and embodiment 1 are together.
The laser emitting module of the present embodiment also comprises power controller, for controlling the laser power that laser instrument generates.According to different practical application scenes, need the laser using different capacity.Such as, need when there being multiple monitoring point to detect, and during monitoring point and Surveillance center distant, controller can be adjusted to increase the laser power of laser instrument transmitting.
The laser detector of the present embodiment is also connected with detection sensitivity adjusting gear, for adjusting the sensitivity of the laser energy that laser detector receives.By arranging detection sensitivity adjusting gear, the sensitivity of the laser energy that laser detector receives can be adjusted.Because laser is after Optical Fiber Transmission, laser energy can be decayed, and the laser therefore emitted from same laser emitting module, after the Optical Fiber Transmission of different distance, can be different by the laser energy that laser detector detects.By arranging detector sensitivity adjusting gear, the laser of different laser energy can be adjusted to same levels by the laser energy signal that laser detector detects.
The forward Laser Transmission module of the present embodiment comprises optical fiber, optical splitter and laser energy multiplying arrangement, described luminous energy multiplying arrangement is for increasing the energy from optical splitter laser beam out, to ensure that the laser entering lasing light emitter has enough laser energies, laser amplification device only increases the energy of laser, but does not change the wavelength of laser.
As shown in Figure 3, the gas measurement unit of the present embodiment is made up of a porose container 112 of airtight container 111, being full of reference gas and a light-dividing device 14; Described laser detector is made up of laser detector 131 and laser detector 132; Light-dividing device 14 is fixed on one end of airtight container 111, porose container 112, and laser detector 131 is fixed on the other end of airtight container 111, and laser detector 132 is fixed on the other end of porose container 112; Lasing light emitter 12 is fixed on the side of light-dividing device 14.From lasing light emitter 12, laser is out divided into two bundle laser of phase co-wavelength through light-dividing device 14, is wherein a branch ofly received by laser detector 131 after airtight container 111, as with reference to signal; Another bundle is received by laser detector 132, as the gas detection signals of gas to be measured after porose container 112.The gas detection signals of described reference signal and gas to be measured is sent to gas signal receiver module by gas detection signals passback module, increases mark, then be sent to gas signal processing module by gas signal receiver module.Such as, the reference laser energy signal in S1, S2 and SN is masked as S1_ref, S2_ref and SN_ref, and the gas detection signals of gas to be measured is masked as S1_test, S2_test and SN_test.
Due to the reference signal detection while detection gas detection signals to be measured of the laser detector in the present embodiment, therefore gas detection signals passback module, signal pre-processing module, characteristic extracting module, signal comparison module need to process the gas detection signals of gas to be measured and reference signal simultaneously.Wherein, characteristic extracting module also needs to extract the gas detection signals of gas to be detected and the difference of reference signal.A kind of method of calculated difference is directly subtracted each other at the gas detection signals of the gas to be measured of each monitoring point and reference signal, such as, subtracted each other by S1_ref and S1_test, obtain S1_diff.Other methods calculating the difference of two groups of signals are also applicable to the present embodiment, do not do too much description at this.
Owing to there is no SF in reference signal
6gas, has SF in gas to be measured
6during gas, the value of S1_ref and S1_test there will be significant difference, thus S1_diff there will be peak value; Without SF in gas to be measured
6during gas, closely, thus S1_diff is close to 0 for the value of S1_ref and S1_test.By said method, SF can be realized
6the high precision test of gas, thus the inaccurate impact of accuracy of detection that elimination laser power variation causes.
Above-described embodiment is the present invention's preferably embodiment; but embodiments of the present invention are not limited by the examples; as as described in remote terminal part also can adopt the form of single remote terminal; change, the modification done under other any does not deviate from Spirit Essence of the present invention and principle, substitute, combine, simplify; all should be the substitute mode of equivalence, be included within protection scope of the present invention.
Claims (8)
1. a SF
6leakage Gas monitoring system, is characterized in that, comprises host machine part, remote terminal part and Signal transmissions part,
Described host machine part comprises laser emitting module, gas signal receiver module, gas signal processing module;
Described remote terminal part comprises at least one remote-terminal unit; Each remote-terminal unit comprises lasing light emitter, laser detector and gas measurement unit;
Described gas measurement unit is full of the airtight container of reference gas, a porose container and a light-dividing device by one and forms; Described laser detector is made up of the first laser detector and the second laser detector; Light-dividing device is fixed on one end of airtight container, porose container, and the first laser detector is fixed on the other end of airtight container, and the second laser detector is fixed on the other end of porose container; Lasing light emitter is fixed on the side of light-dividing device;
From lasing light emitter, laser is out divided into two bundle laser of phase co-wavelength through light-dividing device, is wherein a branch ofly received by the first laser detector after airtight container, as with reference to signal; Another bundle is received by the second laser detector after porose container, is the gas detection signals of gas to be measured;
The gas detection signals of described reference signal and gas to be measured is sent to gas signal receiver module by gas detection signals passback module, increases mark, then be sent to gas signal processing module by gas signal receiver module;
Described Signal transmissions part comprises forward Laser Transmission module and gas detect signal return module;
The laser of the specific wavelength launched is passed through the lasing light emitter of forward Laser Transmission module transfer to remote-terminal unit by described laser emitting module, the laser of specific wavelength is sent in gas measurement unit by lasing light emitter, and the laser of specific wavelength is received by laser detector through after gas measurement unit; The laser energy detected is converted to electric signal by laser detector, is called gas detection signals; Gas detection signals is sent to gas signal receiver module by gas detection signals passback module, and is processed gas detection signals by gas signal processing module, judges whether to there is SF
6leakage Gas;
Described specific wavelength is SF
6the peak absorbtivity wavelength of gas.
2. SF according to claim 1
6leakage Gas monitoring system, is characterized in that, described laser emitting module comprises laser instrument, focus set and laser couplers, and the laser generated from laser instrument is focused on by focus set; Again by laser couplers by focus on after laser coupled in optical fiber.
3. SF according to claim 2
6leakage Gas monitoring system, is characterized in that, described laser emitting module also comprises power controller, for controlling the laser power that laser instrument generates.
4. SF according to claim 1
6leakage Gas monitoring system, it is characterized in that, described gas detection signals is sent to gas signal receiver module by gas detection signals passback module, be specially: the gas detection signals from remote-terminal unit increases mark by gas signal receiver module, be called the markd gas detection signals of band, the corresponding remote-terminal unit of each mark; Gas signal receiver module receives the electric signal of multiple remote-terminal unit simultaneously, or receives the gas detection signals of multiple remote-terminal unit respectively according to time series mode.
5. SF according to claim 1
6leakage Gas monitoring system, is characterized in that, described gas signal processing module comprises
Signal pre-processing module, for carrying out filtering process to gas detection signals;
Characteristic extracting module, for extracting characteristic to gas detection signals after pretreatment;
Signal comparison module, for characteristic and the SF prestored of the gas to be measured by extraction
6gas characteristic data are carried out feature and are compared.
6. SF according to claim 1
6leakage Gas monitoring system, is characterized in that, described laser detector is also connected with detection sensitivity adjusting gear, receives the sensitivity of laser energy for adjusting laser detector.
7. SF according to claim 1
6leakage Gas monitoring system, is characterized in that, described forward Laser Transmission module comprises optical fiber, optical splitter, and laser beam is linked in the lasing light emitter of multiple remote-terminal unit by described optical splitter;
Laser beam is linked into the mode of the lasing light emitter of multiple remote-terminal unit for accessing or access in serial fashion simultaneously by described optical splitter.
8. SF according to claim 7
6leakage Gas monitoring system, is characterized in that, described forward Laser Transmission module also comprises laser energy multiplying arrangement, and described laser energy multiplying arrangement is for increasing the energy from optical splitter laser beam out.
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| CN103439292B (en) * | 2013-09-11 | 2017-01-04 | 清华大学 | Multi-channel laser absorption spectrum measures system |
| CN103558181A (en) * | 2013-11-06 | 2014-02-05 | 郑州光力科技股份有限公司 | Online monitoring system for sulfur hexafluoride switch |
| CN105278473A (en) * | 2014-06-09 | 2016-01-27 | 贵阳铝镁设计研究院有限公司 | Unattended distribution substation SF6 gas leakage remote monitoring method and device |
| CN104568323B (en) * | 2014-06-25 | 2017-10-31 | 贵州电力试验研究院 | A kind of SF6Gas leaks online monitoring alarm system |
| CN108760666A (en) * | 2018-03-01 | 2018-11-06 | 国网湖北省电力公司咸宁供电公司 | A kind of interior SF6Gas leakage monitoring and Recovery Purifying processing system |
| CN109188265A (en) * | 2018-10-08 | 2019-01-11 | 南昌航空大学 | For monitoring SF on-line6The devices and methods therefor of circuit breaker failure type |
| CN112781795A (en) * | 2019-11-07 | 2021-05-11 | 许继集团有限公司 | Water leakage detection device for converter valve |
| CN117491314A (en) * | 2023-12-27 | 2024-02-02 | 金卡智能集团(杭州)有限公司 | Combustible gas detection device and detection method |
| CN117517240B (en) * | 2024-01-08 | 2024-03-19 | 新仟意能源科技(成都)集团有限责任公司 | Light hydrocarbon component on-line detection method and system based on infrared light |
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