CN101696897A - Mobile single-frequency differential natural gas pipeline leakage laser remote sensing detection system and single-frequency differential natural gas pipeline leakage laser remote sensing detection method - Google Patents
Mobile single-frequency differential natural gas pipeline leakage laser remote sensing detection system and single-frequency differential natural gas pipeline leakage laser remote sensing detection method Download PDFInfo
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 66
- 238000001514 detection method Methods 0.000 title claims abstract description 47
- 239000003345 natural gas Substances 0.000 title abstract description 8
- 238000004891 communication Methods 0.000 claims abstract description 7
- 238000012423 maintenance Methods 0.000 claims abstract description 7
- 238000007493 shaping process Methods 0.000 claims description 27
- 238000000034 method Methods 0.000 claims description 19
- 238000010521 absorption reaction Methods 0.000 claims description 17
- 230000003287 optical effect Effects 0.000 claims description 14
- 238000012360 testing method Methods 0.000 claims description 12
- 238000012546 transfer Methods 0.000 claims description 12
- 239000000835 fiber Substances 0.000 claims description 6
- 239000013307 optical fiber Substances 0.000 claims description 3
- 239000007789 gas Substances 0.000 abstract description 42
- 239000000969 carrier Substances 0.000 abstract description 2
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- 230000005540 biological transmission Effects 0.000 description 2
- 239000004568 cement Substances 0.000 description 1
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- 239000002360 explosive Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
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- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/35—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
- G01N21/3504—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light for analysing gases, e.g. multi-gas analysis
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Abstract
The invention discloses a mobile single-frequency differential natural gas pipe line leakage laser remote sensing detection system and a single-frequency differential natural gas pipeline leakage laser remote sensing detection method. The system comprises a signal detection system and a computer, wherein the signal detection system comprises a methane gas detector, a global positioning system GPS, a CCD camera. The GPS and the CCD camera perform signal communication with the computer; the lens of the CCD camera is pointed at a pipe target to be detected; and the methane gas detector is used for detecting a leaking pipe. The system is simple in structure and is easy to use, the response speed of the whole system is high and the whole system can be carried by a vehicle or other moving carriers in order to be used. Therefore, the use of the system is convenient and the maintenance cost of the system is low.
Description
Technical field
The present invention relates to the remote sensing field, especially a kind of mobile single frequency difference that is used for gas pipeline leakage laser remote sensing detection under the move mode is divided gas pipeline leakage laser remote sensing detection system and method.
Background technology
Since the nineties in 20th century, the China's natural gas pipeline is rapidly developed, and the natural gas consumption field progressively enlarges, and gas, generating, industrial fuel, chemical industry usefulness gas increase substantially.The mileage of gas transmission line has had very big growth, the caused leakage of aperture on natural gas transmission pipe network and its parts flange, valve, pump and the O-ring seal thereof is inevitable, this source of leaks has thousands of, the gas that leaks has not only directly caused economic loss, and is inflammable and explosive and source pollution.The quick detection pipeline leakage is to reducing being even more important of economic loss and accident, and the researchist is striving for high sensitivity quick detection technology and device always for this reason.The principal ingredient of rock gas is a methane, present remote detecting method mainly contains the differential laser radar, this technology mainly adopts two laser instruments, and the emission wavelength of a laser instrument is positioned at the absorption peak of methane molecule, and an other laser works wavelength is positioned on the line wing of methane molecule.The laser instrument that can be used for the radar detection of methane molecule differential laser at present mainly is optical parametric oscillator (OPO), and its price is extremely expensive.
Summary of the invention
The purpose of this invention is to provide a kind of mobile single frequency difference and divide gas pipeline leakage laser remote sensing detection system and method, to solve weak point of the prior art, provide a kind of practicality, response speed is fast, easy to use and maintenance cost is low mobile natural gas pipe leakage laser remote sensing detection system and information system management technology.
In order to achieve the above object, the technical solution adopted in the present invention is:
The mobile single frequency difference is divided gas pipeline leakage laser remote sensing detection system and method, include signal detection system and computing machine, it is characterized in that: described signal detection system comprises methane gas detection instrument, GPS GPS and CCD camera, described GPS GPS and CCD camera and described computing machine carry out signal and communication, and described CCD camera lens is aimed at the pipe under test target;
Described methane gas detection instrument comprises microprocessor, Cassegrain telescope, laser instrument, described microprocessor and described computing machine carry out signal and communication, be electrically connected with digital to analog converter and analog to digital converter on the microprocessor respectively, be electrically connected with three identical lock-in amplifiers on the described analog to digital converter; The lens barrel of described Cassegrain telescope is provided with light beam shaping module, has the hole on the described Cassegrain telescope primary mirror, is provided with optical filter in the hole, and the described optical filter back side is provided with second photodetector; Be electrically connected with the laser current temperature controller on the Laser Modulation end of described laser instrument, the light-emitting window of laser instrument is disposed with the laser beam splitter device, with reference to absorption cell, first photodetector, and is described with reference to charging into methane gas in the absorption cell; Described first photodetector is electrically connected with first lock-in amplifier, described second photodetector is electrically connected with second, third lock-in amplifier respectively, and the light inlet place of described light beam shaping module is connected with optical fiber to receive the part beam splitting light of described laser beam splitter device;
Described microprocessor produces DC component DC and sine wave signal by digital to analog converter, and transfer to the laser current temperature controller, the wavelength of transmitted light and the modulated laser of described laser current temperature controller control laser instrument, the emergent light of described laser instrument is divided into two-beam by described laser beam splitter device in certain light intensity ratio, a branch of light process is with reference to being received by first photodetector behind the absorption cell, first photodetector transfers to microprocessor by analog to digital converter after signal is transferred to the first lock-in amplifier demodulation, another Shu Guang is transmitted through the fiber to described light beam shaping module, after the light beam shaping module shaping, be emitted to the pipe under test target with Cassegrain telescope with optical axis, the reflected light of pipe under test target is received by described Cassegrain telescope, and after being converted to electric signal by second photodetector of Cassegrain telescope inside, by transferring to described analog to digital converter after second lock-in amplifier and the 3rd lock-in amplifier demodulation, transfer to microprocessor after by analog to digital converter signal being converted into digital signal, microprocessor will collect second, the output signal of the 3rd lock-in amplifier is divided by and is obtained a ratio that is proportional to concentration of methane gas, described ratio is corresponding to pairing a certain gas concentration on the system calibrating curve that measures with calibrating gas, the concentration signal that computer real-time acquisition is sent by microprocessor, if the gas concentration that records is greater than the alarm threshold value of setting, computing machine will start the CCD camera and begin to gather the image that leaks scene, and the positional information of record GPS GPS, simultaneous computer will leak scene information, the concentration information of GPS information and leakage sends to Center For Information Management or follow-up maintenance group.
Described mobile single frequency difference is divided gas pipeline leakage laser remote sensing detection system and method, it is characterized in that: be electrically connected with sine wave module and FEEDBACK CONTROL DC level module on the described digital to analog converter respectively, the output terminal of described sine wave module and FEEDBACK CONTROL DC level module is electrically connected with two input ends of same totalizer respectively, and the output terminal of described totalizer is electrically connected with the input end of described laser current temperature controller; Described microprocessor produces DC component DC and sine wave signal by sine wave module on the digital to analog converter and FEEDBACK CONTROL DC level module, and transfers to described laser current temperature controller by totalizer.
Described mobile single frequency difference is divided gas pipeline leakage laser remote sensing detection system and method, it is characterized in that: described laser beam splitter device is divided into two bundles in 99: 1 light intensity ratio with the emergent light of laser instrument, 1% laser emitting light passes through with reference to absorption cell, and 99% laser emitting light is transmitted through the fiber to described light beam shaping module.
Described mobile single frequency difference is divided gas pipeline leakage laser remote sensing detection system and method, it is characterized in that: also be provided with two catoptrons on the lens barrel of described Cassegrain telescope, one of them catoptron is positioned at the light-emitting window of described light beam shaping module, and the emergent light of described light beam shaping module is emitted to the pipe under test target with Cassegrain telescope with optical axis after two mirror reflects successively.
Described mobile single frequency difference is divided gas pipeline leakage laser remote sensing detection system and method, it is characterized in that: described each parts of methane gas detection instrument become one.
Described mobile single frequency difference is divided gas pipeline leakage laser remote sensing detection system and method, it is characterized in that: described laser instrument is a diode laser.
System of the present invention comprises signal detection system and computing machine, and signal detection system comprises methane gas detection instrument, GPS GPS, CCD phase instrument.
The methane gas detection instrument is mainly by light beam shaping module, Cassegrain telescope, first photodetector, three lock-in amplifiers, diode laser, laser current temperature controller, sine wave module, FEEDBACK CONTROL DC level module, totalizer, laser beam splitter devices, form with reference to absorption cell, the second photodetector digital to analog converter, analog to digital converter, digital to analog converter and microprocessor etc.
Microprocessor produces DC component DC and sine wave signal by digital to analog converter, after totalizer, be injected into the laser current temperature controller, DC component DC guarantees that the laser instrument emission wavelength is operated in gas absorption to be measured peak position, and sine wave signal is used for modulated laser.Laser output is divided into 99: 1 by a laser beam splitter device, the light of 1% part passes through with reference to absorption cell, with reference to charging into methane gas in the absorption cell, deliver to first lock-in amplifier through light through the detection of first photodetector and carry out the harmonic signal demodulation, signal after the demodulation is delivered to microprocessor through analog to digital converter and is produced an error signal, error signal changes the magnitude of voltage of FEEDBACK CONTROL DC level module by digital to analog converter, and then realizes laser frequency lock.Intensity is that 99% light is connected to light beam shaping module, and the beam divergence angle after the shaping is about 0.3mrad.Light beam is launched with optical axis with Cassegrain telescope after two mirror reflects.The laser of launching arrives on the landform of its rear side by doubtful leakage air mass, as cement, earth, meadow etc., turning back to Cassegrain telescope through the scattering of face of land scattering thing collects, light after the collection is surveyed through second photodetector and is delivered to second lock-in amplifier and the 3rd lock-in amplifier carries out secondary and the demodulation of first harmonic signal, and the signal after the demodulation is delivered to microprocessor through analog to digital converter and carried out analyzing and processing.Microprocessor is divided by the second harmonic signal that collects and first harmonic signal and obtains a value that is proportional to concentration of methane gas, and this ratio is corresponding to pairing a certain gas concentration on the system calibrating curve that measures with calibrating gas.
The concentration signal that computer real-time acquisition is sent by microprocessor, if the gas concentration that records is greater than the alarm threshold value of setting, computing machine will start CCD and begin to gather the image that leaks scene, write down the GPS positional information simultaneously, the concentration information that simultaneous computer will leak scene information, GPS information and leakage sends to Center For Information Management or follow-up maintenance group.
The present invention is simple in structure, is easy to practicality, and the response speed of total system is very fast, total system can be carried on the motion carriers such as vehicle, aircraft during use, and it is comparatively convenient therefore to use, and the maintenance cost of system is very low.
Description of drawings
Fig. 1 is a system architecture synoptic diagram of the present invention.
Embodiment
The mobile single frequency difference is divided gas pipeline leakage laser remote sensing detection system and method, include signal detection system and computing machine 218, signal detection system comprises methane gas detection instrument, GPS GPS 220 and CCD camera 221, GPS GPS 220 and CCD camera 221 carry out signal and communication, CCD camera 221 alignment lens pipe under test targets 113 with computing machine 218;
The methane gas detection instrument comprises microprocessor 217, Cassegrain telescope 120, laser instrument 226, microprocessor 217 carries out signal and communication with computing machine 218, be electrically connected with digital to analog converter 219 and analog to digital converter 216 on the microprocessor 217 respectively, be electrically connected with three identical lock-in amplifiers on the analog to digital converter 216; The lens barrel of Cassegrain telescope 120 is provided with light beam shaping module 110, has the hole on Cassegrain telescope 120 primary mirrors 121, is provided with optical filter 122 in the hole, and optical filter 122 back sides are provided with second photodetector 124; Laser instrument 226 is electrically connected with laser current temperature controller 225, and the light-emitting window of laser instrument 226 is disposed with laser beam splitter device 210, with reference to absorption cell 211, first photodetector 212, with reference to charging into methane gas in the absorption cell 211; First photodetector 212 is electrically connected with first lock-in amplifier 213, second photodetector 124 is electrically connected with second, third lock-in amplifier 214,215 respectively, and the light inlet place of light beam shaping module 110 is connected with optical fiber to receive the part beam splitting light of described laser beam splitter device 210;
Be electrically connected with sine wave module 223 and FEEDBACK CONTROL DC level module 222 on the digital to analog converter 219 respectively, the output terminal of sine wave module 223 and FEEDBACK CONTROL DC level module 222 is electrically connected with two input ends of same totalizer 224 respectively, and the output terminal of totalizer 224 is electrically connected with the input end of laser current temperature controller 225; Microprocessor 217 produces DC component DC and sine wave signal by sine wave module 223 on the digital to analog converter 219 and FEEDBACK CONTROL DC level module 222, and transfers to laser current temperature controller 225 by totalizer 224.
Laser beam splitter device 210 is divided into two bundles in 99: 1 light intensity ratio with the emergent light of laser instrument 226, and 1% laser instrument 226 emergent lights are transmitted through the fiber to described light beam shaping module 110 by laser instrument 226 emergent lights with reference to absorption cell 211,99%.
Also be provided with two catoptrons 111,112 on the lens barrel of Cassegrain telescope 120, one of them catoptron 111 is positioned at the light-emitting window of light beam shaping module 110, and the emergent light of light beam shaping module 110 is emitted to pipe under test target 113 with Cassegrain telescope 120 with optical axis by two catoptrons, 111,112 reflection backs successively.
Each parts of methane gas detection instrument become one.
Claims (6)
1. the mobile single frequency difference is divided gas pipeline leakage laser remote sensing detection system and method, include signal detection system and computing machine, it is characterized in that: described signal detection system comprises methane gas detection instrument, GPS GPS and CCD camera, described GPS GPS and CCD camera and described computing machine carry out signal and communication, and described CCD camera lens is aimed at the pipe under test target;
Described methane gas detection instrument comprises microprocessor, Cassegrain telescope, laser instrument, described microprocessor and described computing machine carry out signal and communication, be electrically connected with digital to analog converter and analog to digital converter on the microprocessor respectively, be electrically connected with three identical lock-in amplifiers on the described analog to digital converter; The lens barrel of described Cassegrain telescope is provided with light beam shaping module, has the hole on the described Cassegrain telescope primary mirror, is provided with optical filter in the hole, and the described optical filter back side is provided with second photodetector; Be electrically connected with the laser current temperature controller on the Laser Modulation end of described laser instrument, the light-emitting window of laser instrument is disposed with the laser beam splitter device, with reference to absorption cell, first photodetector, and is described with reference to charging into methane gas in the absorption cell; Described first photodetector is electrically connected with first lock-in amplifier, described second photodetector is electrically connected with second, third lock-in amplifier respectively, and the light inlet place of described light beam shaping module is connected with optical fiber to receive the part beam splitting light of described laser beam splitter device;
Described microprocessor produces DC component DC and sine wave signal by digital to analog converter, and transfer to the laser current temperature controller, the wavelength of transmitted light and the modulated laser of described laser current temperature controller control laser instrument, the emergent light of described laser instrument is divided into two-beam by described laser beam splitter device in certain light intensity ratio, a branch of light process is with reference to being received by first photodetector behind the absorption cell, first photodetector transfers to microprocessor by analog to digital converter after signal is transferred to the first lock-in amplifier demodulation, another Shu Guang is transmitted through the fiber to described light beam shaping module, after the light beam shaping module shaping, be emitted to the pipe under test target with Cassegrain telescope with optical axis, the reflected light of pipe under test target is received by described Cassegrain telescope, and after being converted to electric signal by second photodetector of Cassegrain telescope inside, by transferring to described analog to digital converter after second lock-in amplifier and the 3rd lock-in amplifier demodulation, transfer to microprocessor after by analog to digital converter signal being converted into digital signal, microprocessor will collect second, the output signal of the 3rd lock-in amplifier is divided by and is obtained a ratio that is proportional to concentration of methane gas, described ratio is corresponding to pairing a certain gas concentration on the system calibrating curve that measures with calibrating gas, the concentration signal that computer real-time acquisition is sent by microprocessor, if the gas concentration that records is greater than the alarm threshold value of setting, computing machine will start the CCD camera and begin to gather the image that leaks scene, and the positional information of record GPS GPS, simultaneous computer will leak scene information, the concentration information of GPS information and leakage sends to Center For Information Management or follow-up maintenance group.
2. mobile single frequency difference according to claim 1 is divided gas pipeline leakage laser remote sensing detection system and method, it is characterized in that: be electrically connected with sine wave module and FEEDBACK CONTROL DC level module on the described digital to analog converter respectively, the output terminal of described sine wave module and FEEDBACK CONTROL DC level module is electrically connected with two input ends of same totalizer respectively, and the output terminal of described totalizer is electrically connected with the input end of described laser current temperature controller; Described microprocessor produces DC component DC and sine wave signal by sine wave module on the digital to analog converter and FEEDBACK CONTROL DC level module, and transfers to described laser current temperature controller by totalizer.
3. mobile single frequency difference according to claim 1 is divided gas pipeline leakage laser remote sensing detection system and method, it is characterized in that: described laser beam splitter device is divided into two bundles in 99: 1 light intensity ratio with the emergent light of laser instrument, 1% laser emitting light passes through with reference to absorption cell, and 99% laser emitting light is transmitted through the fiber to described light beam shaping module.
4. mobile single frequency difference according to claim 1 is divided gas pipeline leakage laser remote sensing detection system and method, it is characterized in that: also be provided with two catoptrons on the lens barrel of described Cassegrain telescope, one of them catoptron is positioned at the light-emitting window of described light beam shaping module, and the emergent light of described light beam shaping module is emitted to the pipe under test target with Cassegrain telescope with optical axis after two mirror reflects successively.
5. mobile single frequency difference according to claim 1 is divided gas pipeline leakage laser remote sensing detection system and method, it is characterized in that: described each parts of methane gas detection instrument become one.
6. mobile single frequency difference according to claim 1 is divided gas pipeline leakage laser remote sensing detection system and method, it is characterized in that: described laser instrument is a diode laser.
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| CN104101571A (en) * | 2014-07-27 | 2014-10-15 | 北京航星网讯技术股份有限公司 | Methane gas detecting method and device with laser distance-measuring function |
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