CN202994382U - Monitoring system for SF6 gas leakage - Google Patents
Monitoring system for SF6 gas leakage Download PDFInfo
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- CN202994382U CN202994382U CN 201220713196 CN201220713196U CN202994382U CN 202994382 U CN202994382 U CN 202994382U CN 201220713196 CN201220713196 CN 201220713196 CN 201220713196 U CN201220713196 U CN 201220713196U CN 202994382 U CN202994382 U CN 202994382U
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Abstract
Disclosed in the utility model is a monitoring system for SF6 gas leakage. The monitoring system comprises a host portion, a remote terminal portion and a signal transmission portion. Specifically, the host portion includes a laser emission module, a gas signal receiving module, and a gas signal processing module; the remote terminal portion includes at least one remote terminal unit, wherein each of the remote terminal unit consists of a laser source, a laser detector, and a gas measuring unit; and the signal transmission portion includes a forward laser transmission module and a gas detection signal returning module. Compared with the prior art, the technology employed by the utility model enables the system to have the following beneficial effects: an SF6 gas leakage situation of a monitored point can be monitored truly and the automatic monitoring of the SF6 gas leakage situation can be realized, thereby reducing the number of times of field patrol inspection of the work staff.
Description
Technical field
The utility model relates to the detection field of electrical equipment, particularly a kind of detection system for detection of sulfur hexafluoride in electrical equipment (SF6) Leakage Gas.
Background technology
SF6 is as the electric insulation medium of a new generation, have superpower insulating capacity and arc extinguishing ability, and has a noncombustibility, at first use in isolating switch and combined electrical apparatus in the sixties in 20th century, enlarge in recent years and be applied to transformer, cable etc., the SF6 air insulating device comprises transformer, isolating switch, mutual inductor, the gas-insulating and fully-enclosed combined electrical apparatus of GIS(), become the main development direction of high-tension apparatus.
The analytical approach that is applied at present SF6 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 is the slow-footed characteristics that the velocity ratio of utilizing sound wave to propagate in SF6 gas is propagated in atmosphere, detects, and its sensitivity that detects the SF Leakage Gas is low; And be only suitable for leakage location, zonule, be not suitable for the large tracts of land on-line monitoring.Electrochemical gas sensor is to detect the concentration of gas by detecting electric current, is that a kind of non-special-purpose SF6 detects use, is not suitable for long-time on-line monitoring.The ultraviolet ionization method is to add certain material, utilizes SF6 gas absorption characteristic, detects the concentration of adsorbate, and its detection sensitivity is high, but because needs add particular matter, is not suitable for on-line monitoring.The electron capture method is to utilize the electronegativity of SF6 gas, and namely the SF6 gas molecule characteristic that can catch the free movement electronics is measured the concentration of SF6 gas.This method highly sensitive; But the measuring equipment volume is large, is only suitable for the laboratory high precision and detects, and is not suitable for the large tracts of land on-line monitoring.Also has a kind of method of measuring the SF6 Leakage Gas by absorption spectrum.Because gas atom has fixing spectral absorption characteristics, therefore can measure by spectrographic technique.In this method, usually laser beam need to be transmitted in gas, then the signal of receiving end is analyzed.Typical Representative is the laser imaging method, namely utilizes SF6 gas to the strong absorption characteristic of a certain infrared spectrum, and search coverage is carried out the qualitative detection that light spectrum image-forming is realized the SF Leakage Gas.This laser imaging method is highly sensitive, leaks the location but be only suitable for the zonule, is not suitable for the large tracts of land on-line monitoring.
Above method can only be monitored at needs the monitoring point Site Detection SF6 Leakage Gas of SF6 Leakage Gas mostly; Perhaps need the band detection gas of monitoring point is extracted in a closed container, closed container is taken back the laboratory measure.Because a plurality of electrical equipments usually are distributed in a larger geographic range, if need to monitor the SF6 Leakage Gas of a plurality of electrical equipments, traditional SF6 gas leak detection method all needs the staff to process to the scene, monitoring point at every turn.Therefore the work efficiency that detects in order to improve the SF6 Leakage Gas needs a kind ofly can need not the staff and patrol and examine to the scene, and the method that can be simultaneously the SF6 Leakage Gas of a plurality of diverse geographic locations be detected.
The utility model content
For the above-mentioned shortcoming and deficiency that overcome prior art, the purpose of this utility model is to provide a kind of SF6 Leakage Gas monitoring system, can carry out remote online monitoring to a plurality of monitoring points.
The purpose of this utility model is achieved through the following technical solutions:
A kind of SF6 Leakage Gas monitoring system comprises host machine part, remote terminal part and signal hop,
Described host machine part comprises laser emitting module, gas signal receiver module, gas signal processing module;
Described remote terminal partly comprises at least one remote-terminal unit; Each remote-terminal unit comprises lasing light emitter, laser detector and gas measurement unit;
Described signal hop comprises the gentle health check-up survey of forward Laser Transmission module signal return module;
Described laser emitting module is transferred to the lasing light emitter of remote-terminal unit with the laser of the specific wavelength of emission by forward Laser Transmission module, lasing light emitter is sent to the laser of specific wavelength in gas measurement unit, and the laser of specific wavelength is received by laser detector after passing gas measurement unit; Laser detector is converted to electric signal with the laser energy that detects, and is called gas detection signals; Gas detection signals returns module by gas detection signals and is sent to the gas signal receiver module, and by the gas signal processing module, gas detection signals is processed, and judges whether to exist the SF6 Leakage Gas;
Described specific wavelength is the peak absorbtivity wavelength of SF6 gas.
Further, described laser emitting module comprises laser instrument, focus set and laser couplers, and the laser that generates from laser instrument focuses on by focus set; Laser coupled after focusing on by laser couplers again is in optical fiber.
Further, described laser emitting module also comprises power controller, is used for controlling the laser power that laser instrument generates.
Described gas detection signals returns module by gas detection signals and is sent to the gas signal receiver module, be specially: the gas detection signals from remote-terminal unit increases mark by the gas signal receiver module, be called and be with markd gas detection signals, the corresponding remote-terminal unit of each mark; The gas signal receiver module receives the electric signal of a plurality of remote-terminal units simultaneously, or receives respectively the gas detection signals of a plurality of remote-terminal units according to the time series mode.
Further, described gas signal processing module comprises
Signal pre-processing module is used for that gas detection signals is carried out filtering and processes;
Characteristic extracting module is used for gas detection signals after pretreatment is extracted characteristic;
The signal comparison module carries out feature relatively for the characteristic of the gas to be measured that will extract and pre-stored SF6 gas characteristic data.
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; Out laser is received by laser detector after porose container from lasing light emitter, is the gas detection signals of gas to be measured;
The gas detection signals of described gas to be measured returns module by gas detection signals and is sent to the gas signal receiver module, by the gas signal receiver module and increase mark, then is sent to the gas signal processing 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 comprised of the first laser detector and the second laser detector; Light-dividing device is fixed on an 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 a side of light-dividing device;
Out laser is divided into two bundle laser of identical wavelength through light-dividing device from lasing light emitter, is wherein a branch ofly received by the first laser detector after airtight container, as the reference 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 returns module by gas detection signals and is sent to the gas signal receiver module, increases mark by the gas signal receiver module, then is sent to the gas signal processing module.
Described laser detector also is connected with the detection sensitivity adjusting gear, be used for to adjust the sensitivity of the laser energy that laser detector receives.
Described forward Laser Transmission module comprises optical fiber, optical splitter, and described optical splitter is linked into laser beam in the lasing light emitter of a plurality of remote-terminal units;
Described optical splitter laser beam is linked into a plurality of remote-terminal units lasing light emitter mode for simultaneously the access or access in the sequence mode.
Described forward Laser Transmission module also comprises the 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 utlity model has following advantage and beneficial effect:
1, the laser signal of SF6 Leakage Gas monitoring system of the present utility model adopts the Optical Fiber Transmission mode, and laser signal directly is sent to the monitoring point, do not need the gas collecting in zone to be monitored or pump to other position, can monitor truly the SF6 leakage situation of monitored point, can realize the automatic monitoring of SF6 Leakage Gas situation, reduce staff's scene and maked an inspection tour the maintenance number of times.
2, SF6 Leakage Gas monitoring system of the present utility model can adopt in the monitoring point single or a plurality of remote-terminal units that the laser energy signal is measured, by the comparison process between a plurality of laser energy signals, can improve the stability that SF6 gas detects.
3, SF6 Leakage Gas monitoring system of the present utility model is utilized SF6 gas absorption spectra characteristic, and (medium that the laser of 1050nm～1060nm) detects as SF6 gas, the accuracy that the SF6 Leakage Gas detects is improved significantly to adopt specific wavelength.
Description of drawings
Fig. 1 is the composition schematic diagram of the SF6 Leakage Gas monitoring system of embodiment 1.
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 utility model is described in further detail, but embodiment of the present utility model is not limited to this.
Embodiment 1
As shown in Figure 1, the SF6 Leakage Gas monitoring system of the present embodiment comprises host machine part, remote terminal part and signal hop.Described host machine part comprises laser emitting module, gas signal receiver module, gas signal processing module; Described remote terminal partly comprises at least one remote-terminal unit; Each remote-terminal unit comprises lasing light emitter, laser detector and gas measurement unit; Described signal hop comprises the gentle health check-up survey of forward Laser Transmission module signal return module.
Described laser emitting module is transferred to the lasing light emitter of remote-terminal unit with the laser of the specific wavelength of emission by forward Laser Transmission module, lasing light emitter is sent to the laser of specific wavelength in gas measurement unit, and the laser of specific wavelength is received by laser detector after passing gas measurement unit; Laser detector is converted to electric signal with the laser energy that detects, and is called gas detection signals; Gas detection signals returns module by gas detection signals and is sent to the gas signal receiver module, and by the gas signal processing module, gas detection signals is processed, and judges whether to exist the SF6 Leakage Gas.
1, host machine part
1.1 laser emitting module
Laser emitting module comprises laser instrument, focus set and laser couplers, and the laser that generates from laser instrument focuses on by focus set; Laser coupled after focusing on by laser couplers again is in optical fiber.The laser of specific wavelength refers to the peak absorbtivity wavelength of SF6 gas, i.e. near laser 1055nm.Specifically, the wavelength peak of the laser that emits exactly is near the laser 1055nm, and for example wavelength coverage is the laser of 1050nm～1060nm.
1.2 gas signal receiver module
The gas signal receiver module can receive the SF6 gas detection signals by multiple diverse ways, and for example the wire transmission network receives signal or wireless-transmission network.Need a receiving trap, come the receiver gases detection signal as network interface card, modulator-demodular unit etc.A receiving trap can receive the signal of a plurality of separate sources simultaneously.
The gas signal receiver module can receive the gas detection signals from a plurality of remote-terminal units.Increase mark as the gas detection signals that receives from remote-terminal unit 1, remote-terminal unit 2 and remote-terminal unit N by the gas signal receiver module, the corresponding remote-terminal unit of each mark, be called and be with markd gas detection signals, for example the gas detection signals of remote-terminal unit 1, remote-terminal unit 2 and remote-terminal unit N is marked as respectively S1, S2 and SN.
The gas signal receiver module can receive the gas detection signals of a plurality of separate sources simultaneously, for example receives simultaneously S1, S2 and SN; Also can receive respectively according to the time series mode gas detection signals of separate sources, for example first receive S2, after waiting the S2 signal data to receive, then receive S1, after waiting the S1 signal data to receive, receive at last the signal data of SN.
Be with markd gas detection signals, for example S1, S2 and SN, can be the laser energy signal of gas to be detected, can be also laser energy signal and the reference laser energy signal of gas to be detected.The laser energy signal means the numerical signal of the energy size that laser comprises.The laser energy signal of gas to be detected is the energy size that comprises through the laser after gas absorption to be detected.For example, the laser energy signal indication of the detection of the band in S1, S2 and SN gas is S1_test, S2_test and SN_test.
1.3 the gas signal processing module comprises signal pre-processing module, characteristic extracting module and signal comparison module.
1.3.1 signal pre-processing module is used for that gas detection signals is carried out filtering and processes, the interfere information in the filtering gas detection signals.These interfere informations may be from the data movement in signals transmission, or the interference that causes due to other non-SF6 gases in the gas signal testing process, or due to other interference in the gas signal testing process.By filtering interfering information, can improve the accuracy of detection of SF6 gas signal.
1.3.2 characteristic extracting module is used for gas detection signals after pretreatment is extracted characteristic; Characteristic signal includes but not limited to the peak value of signal intensity, signal duration, signal.After for example being labeled as the gas detection signals process filtering processing of S1, the S1_tes_filter that obtains is designated as F1_test through the feature that obtains after feature extraction.Characteristic signal is represented as one group of data sequence, and for example, F1_test is one group of data sequence.
1.3.3 the signal comparison module carries out feature relatively for the characteristic of the gas to be measured that will extract and pre-stored SF6 gas characteristic data.The feature comparative approach includes but not limited to related coefficient comparative approach, definitely value difference comparative approach, poor quadratic sum comparative approach etc., any two groups of different pieces of information sequences are carried out similarity method relatively can be as the feature comparative approach.If result of calculation surpasses certain threshold value, judge that the SF6 gas detection signals is similar to the SF6 gas signal, the SF6 Leakage Gas has appearred in corresponding monitoring point.
2, remote terminal part
Remote terminal partly comprises a plurality of remote-terminal units; 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 penetrate by the hole on gas measurement unit.If when therefore there was SF6 gas the gas measurement unit outside, also there was SF6 gas the inside of gas detection cell.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 made the laser of emission can be aligned in the center of laser detector by after gas measurement unit by accurate calibration, and laser detector can be converted to electric signal with laser energy as much as possible.The material of porose container can be glass, metal etc., can guarantee that SF6 gas can not absorbed or pass by this material to get final product.
Out laser is received by laser detector after porose container from lasing light emitter, is the gas detection signals of gas to be measured; The gas detection signals of described gas to be measured returns module by gas detection signals and is sent to the gas signal receiver module, by the gas signal receiver module and increase mark, then is sent to the gas signal processing module.
3, signal hop
The signal hop comprises the gentle health check-up survey of forward Laser Transmission module signal return module.
3.1 forward Laser Transmission module comprises optical fiber, optical splitter, is responsible for the specific wavelength that laser emitting module emits is delivered to the remote terminal part by optical fiber transmission.
Optical splitter is linked into laser beam in the lasing light emitter of a plurality of remote-terminal units.The laser of laser emitting module emission is all the laser of same specific wavelength with the laser that enters into lasing light emitter, and just laser energy exists different.Optical splitter can be linked into laser beam in a plurality of remote-terminal units simultaneously, also laser can be linked in a plurality of remote-terminal units in the sequence mode.
3.2 gas detection signals passback module is sender unit, the SF6 gas detection signals of being responsible for laser detector is transmitted is sent to host machine part.Can transmit the SF6 gas detection signals by multiple diverse ways, for example the wire transmission network receives signal or wireless-transmission network.Therefore need a dispensing device, as network interface card, modulator-demodular unit etc., send the SF6 gas detection signals.
Embodiment 2
The present embodiment is except following feature, and all the other features and embodiment 1 are same.
The laser emitting module of the present embodiment also comprises power controller, is used for controlling the laser power that laser instrument generates.According to different practical application scenes, need to use the laser of different capacity.For example, when there being a plurality of monitoring points to detect, and during monitoring point and Surveillance center distant, can adjust the laser power that controller increases the laser instrument emission.
The laser detector of the present embodiment also is connected with the detection sensitivity adjusting gear, be used for to adjust the sensitivity of the laser energy that laser detector receives.By the detection sensitivity adjusting gear is set, can adjust the sensitivity of the laser energy that laser detector receives.Through after Optical Fiber Transmission, laser energy can be decayed due to laser, and after the laser that therefore emits from same laser emitting module passed through the Optical Fiber Transmission of different distance, the laser energy that can be detected by laser detector was different.By the detector sensitivity adjusting gear is set, 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 guarantee that the laser that enters lasing light emitter has enough laser energies, laser amplification device has just increased 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 full of the airtight container 111 of reference gas, a porose container 112 and a light-dividing device 14 by one and forms; Described laser detector is comprised of laser detector 131 and laser detector 132; Light-dividing device 14 is fixed on an 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 a side of light-dividing device 14.Out laser is divided into two bundle laser of identical wavelength through light-dividing device 14 from lasing light emitter 12, is wherein a branch ofly received by laser detector 131 after airtight container 111, as the reference signal; Another bundle is received by laser detector 132 after porose container 112, as the gas detection signals of gas to be measured.The gas detection signals of described reference signal and gas to be measured returns module by gas detection signals and is sent to the gas signal receiver module, increases mark by the gas signal receiver module, then is sent to the gas signal processing module.For example, the reference laser energy signal in S1, S2 and SN is masked as S1_ref, S2_ref and SN_ref, 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 when detecting gas detection signals to be measured of the laser detector in the present embodiment, so gas detection signals passback module, signal pre-processing module, characteristic extracting module, signal comparison module need process gas detection signals and the reference signal of gas to be measured simultaneously.Wherein, characteristic extracting module also need be extracted the gas detection signals of gas to be detected and the difference of reference signal.A kind of method of calculated difference is that the gas detection signals of the gas to be measured of each monitoring point and reference signal are directly subtracted each other, and for example S1_ref and S1_test is subtracted each other, and obtains S1_diff.Other methods of calculating the difference of two groups of signals also are applicable to the present embodiment, do not do too much description at this.
Owing to there is no SF6 gas in reference signal, when in gas to be measured, SF6 gas being arranged, significant difference can appear in the value of S1_ref and S1_test, thereby peak value can appear in S1_diff; When in gas to be measured during without SF6 gas, the value of S1_ref and S1_test is very approaching, thereby S1_diff approaches and 0.By said method, can realize that the high precision of SF6 gas detects, thereby eliminate the inaccurate impact of accuracy of detection that laser power variation causes.
Above-described embodiment is the better embodiment of the utility model; but embodiment of the present utility model is not limited by the examples; remote terminal partly also can adopt the form of single remote terminal as described; other any do not deviate from change, the modification done under Spirit Essence of the present utility model and principle, substitutes, combination, simplify; all should be the substitute mode of equivalence, within being included in protection domain of the present utility model.
Claims (9)
1. a SF6 Leakage Gas monitoring system, is characterized in that, comprises host machine part, remote terminal part and signal hop,
Described host machine part comprises laser emitting module, gas signal receiver module, gas signal processing module;
Described remote terminal partly comprises at least one remote-terminal unit; Each remote-terminal unit comprises lasing light emitter, laser detector and gas measurement unit;
Described signal hop comprises the gentle health check-up survey of forward Laser Transmission module signal return module;
Described laser emitting module is transferred to the lasing light emitter of remote-terminal unit with the laser of the specific wavelength of emission by forward Laser Transmission module, lasing light emitter is sent to the laser of specific wavelength in gas measurement unit, and the laser of specific wavelength is received by laser detector after passing gas measurement unit; Laser detector is converted to electric signal with the laser energy that detects, and is called gas detection signals; Gas detection signals returns module by gas detection signals and is sent to the gas signal receiver module, and by the gas signal processing module, gas detection signals is processed, and judges whether to exist the SF6 Leakage Gas;
Described specific wavelength is the peak absorbtivity wavelength of SF6 gas.
2. SF6 Leakage Gas monitoring system according to claim 1, is characterized in that, described laser emitting module comprises laser instrument, focus set and laser couplers, and the laser that generates from laser instrument focuses on by focus set; Laser coupled after focusing on by laser couplers again is in optical fiber.
3. SF6 Leakage Gas monitoring system according to claim 2, is characterized in that, described laser emitting module also comprises power controller, is used for controlling the laser power that laser instrument generates.
4. SF6 Leakage Gas monitoring system according to claim 1, is characterized in that, described gas signal processing module comprises
Be used for gas detection signals is carried out the signal pre-processing module that filtering is processed;
Be used for gas detection signals after pretreatment is extracted the characteristic extracting module of characteristic;
Carry out feature signal comparison module relatively for the characteristic of the gas to be measured that will extract and pre-stored SF6 gas characteristic data.
5. SF6 Leakage Gas monitoring system according to claim 1, is characterized in that, described gas measurement unit is a porose container, and lasing light emitter, laser detector are separately fixed at the two ends of porose container; Out laser is received by laser detector after porose container from lasing light emitter, is the gas detection signals of gas to be measured;
The gas detection signals of described gas to be measured returns module by gas detection signals and is sent to the gas signal receiver module, by the gas signal receiver module and increase mark, then is sent to the gas signal processing module.
6. SF6 Leakage Gas monitoring system according to claim 1, is characterized in that, 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 comprised of the first laser detector and the second laser detector; Light-dividing device is fixed on an 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 a side of light-dividing device;
Out laser is divided into two bundle laser of identical wavelength through light-dividing device from lasing light emitter, is wherein a branch ofly received by the first laser detector after airtight container, as the reference 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 returns module by gas detection signals and is sent to the gas signal receiver module, increases mark by the gas signal receiver module, then is sent to the gas signal processing module.
7. SF6 Leakage Gas monitoring system according to claim 1, is characterized in that, described laser detector also is connected with the detection sensitivity adjusting gear of the sensitivity of the laser energy that receives for the adjustment laser detector.
8. SF6 Leakage Gas monitoring system according to claim 1, is characterized in that, described forward Laser Transmission module comprises optical fiber, optical splitter, and described optical splitter is linked into laser beam in the lasing light emitter of a plurality of remote-terminal units.
9. SF6 Leakage Gas monitoring system according to claim 8, is characterized in that, described forward Laser Transmission module also comprises for increasing the laser energy multiplying arrangement from the energy of optical splitter laser beam out.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201220713196 CN202994382U (en) | 2012-12-20 | 2012-12-20 | Monitoring system for SF6 gas leakage |
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| CN 201220713196 CN202994382U (en) | 2012-12-20 | 2012-12-20 | Monitoring system for SF6 gas leakage |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103063368A (en) * | 2012-12-20 | 2013-04-24 | 华南理工大学 | Monitoring system of sulfur hexafluoride (SF6) gas leakage |
| CN103528993A (en) * | 2013-11-04 | 2014-01-22 | 中绿环保科技股份有限公司 | Laser gas analyzer |
-
2012
- 2012-12-20 CN CN 201220713196 patent/CN202994382U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103063368A (en) * | 2012-12-20 | 2013-04-24 | 华南理工大学 | Monitoring system of sulfur hexafluoride (SF6) gas leakage |
| CN103063368B (en) * | 2012-12-20 | 2015-07-01 | 华南理工大学 | Monitoring system of sulfur hexafluoride (SF6) gas leakage |
| CN103528993A (en) * | 2013-11-04 | 2014-01-22 | 中绿环保科技股份有限公司 | Laser gas analyzer |
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