CN101038252A - Method for detesting natural gas and toxic gas with real-time mobile remote sensor - Google Patents
Method for detesting natural gas and toxic gas with real-time mobile remote sensor Download PDFInfo
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- CN101038252A CN101038252A CN 200710014337 CN200710014337A CN101038252A CN 101038252 A CN101038252 A CN 101038252A CN 200710014337 CN200710014337 CN 200710014337 CN 200710014337 A CN200710014337 A CN 200710014337A CN 101038252 A CN101038252 A CN 101038252A
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Abstract
Disclosed is a detecting method of natural gas and poisonous gas, utilizing a real-time mobile remote measuring sensor, wherein a multiple harmonic modulated semiconductor laser absorption spectroscopy method, an photoelectricity receiving system, a DSP software/hardware technology and a laser driving circuit are utilized. A laser beam emitted from an infrared laser emitting/receiving unit formed by a semiconductor laser, fibers, collimating mirrors, filters, photoelectric detectors and micro coke rate reflectors is output after it is collimated by the collimating mirrors through fibers, and then is scattered when it meets an objective. After a frequency selection and filtration by the filters, the scattered laser is then focused, by a reflector, to the photosensitive surface of the photoelectric detector where it is received. The analog signals of a photoelectric detection are digitalized and then sent to the DSP signals processor for a processing to provide concentration information of natural gas and poisonous gas to be tested between the emitting laser and the objective. Therefore, a continuous mobile detection of natural gas and poisonous gas invading into a production locale or a non-production locale is achieved to maintain the safety of the production locale or a non-production locale.
Description
One, technical field
The invention belongs to ring mirror science and field of spectroscopy, be specifically related to a kind of detection method of utilizing real-time mobile remote sensor to rock gas and toxic gas.
Two, background technology
Inflammable, the explosion hazard of rock gas and have characteristics such as toxicity guarantees that the safe operation of the gentle treating stations of gas pipe line field facility is extremely important.After the long-time military service of natural-gas transfer pipeline, can cause fire, blast, poisoning, cause heavy economic losses and casualties and environmental pollution because of reason generation failure accidents such as external disturbance, burn into tubing and construction qualities.In addition, China has verified that high sulfur-containing natural gas occupies quite big proportion in the natural gas reserves.The characteristics of high sulfur-containing natural gas are the not only high H2S of containing, and are rich in CO2.The compound metal pipe material equipment to gathering line and treating stations field of these two kinds of acidic materials produces serious corrosion, often causes metal material under the high pressure conditions not have the booster of omen, paroxysmal stress cracking and gathering line.This kind high sulfur-containing natural gas to be in case leak not only can be explosion caused, and focuses on personal injury and environmental pollution because of the drift diffusion of the hypertoxic gas H2S of nerve will cause.A lot of high sulfur-containing natural gas exploitations once took place and the accident of initiation in China, wherein Kai Xian, Chongqing in 2003 high sulfur-containing natural gas gas blowout accident causes 243 people's death, and and the backwardness of the security detection equipment of depositing cause directly that the exploitation of China high sulfur-containing natural gas is basic to pause, and the gas tight that has formed market for natural gas is opened situation.
The China's natural gas pipeline is in great development period, and industry and resident increase rapidly.Pipeline topography and geomorphology complexity along the line such as the transfering natural gas from the west to the east pipeline that newly builds up, two wires, capital, Shan, geologic hazard type is many, and it is many to pass active breaking belt.Pipe downstream is that populous, economy was sent out provinces and cities, and these pipelines are in case take place to leak or fire explosion will bring serious economy loss and abominable social influence.Importance and urgency that a pipe-line and a station installation security ensure are particularly outstanding.Therefore, for ensureing the safe and highly efficient operation of gas production pipeline and urban pipe network, press for natural gas line and production facility are carried out safety monitoring.And the means of at present natural gas leaking being supervised detection mainly are to adopt fixedly built-in type gas sensor such as all kinds of chemistry, metal oxide and infrared gas.Chemical sensor has higher sensitivity, but easily " poisoning " lost efficacy, and needs frequent maintenance; Semiconductor transducer: selectivity is relatively poor, is subjected to the interference of other gas ingredients in the atmosphere easily, the false alarm rate height, and instrument also needs regularly to carry out Zero calibration simultaneously.Metal oxide sensor also has the defective of sleep except that the shortcoming with semiconductor transducer.Infrared gas senor causes later maintenance expense height then because former thereby have the defective that detection sensitivity is low, be subject to disturb on the principle.The mountain area, place, southwest at China high sulfur-containing natural gas gas reservoir place, this area is with a varied topography, geologic hazard is multiple, local meteorology is changeable; On the other hand, dense, the pipe network of gas downstream urban population lay complicated, the city enlarges rapidly and the influence of surface structures makes the sensor be restricted in practical applications such as gas gathering and transportation, long defeated and urban pipe networks.
Three, summary of the invention
The purpose of this invention is to provide the detection method of a kind of real-time mobile remote sensor, solve the problem that above-mentioned prior art exists rock gas and toxic gas.
Technical scheme of the present invention realizes in the following manner:
The present invention utilizes multiple-harmonic Modulating Diode Laser absorption spectroscopy, photoelectric receiving system, DSP software and hardware technology and laser drive circuit, by by semiconductor laser modulation, optical fiber, collimating mirror, filter plate, photodetector, infrared laser emission receiving element emission laser output behind Optical Fiber Transmission collimating mirror collimation that little coke ratio catoptron constitutes, after meeting the object scattering, focus on the photodetector photosurface by the mirror that is reflected after the filter plate frequency-selecting filter and to receive, then the simulating signal of photodetection is sent into the DSP signal processor processes after digitizing, provide the concentration information of rock gas to be checked between emission laser and the object or toxic gas, realization is safeguarded the safety at production scene or nonproductive scene to invading production scene or the rock gas at nonproductive scene or the continuous mobile monitoring of toxic gas.
Real time sensor is moved in the remote measurement of rock gas of the present invention or toxic gas, form by catoptron, lens barrel, dustproof sheet, photodetector, laser instrument, collimating mirror DSP signal processor and laser driver, it is characterized in that catoptron is installed in the left part of lens barrel, concave surface is equipped with the interface of photodetector and DSP message handler to the right in the focal spot of catoptron; The interface of laser instrument collimating mirror and laser driver is installed in the right part of lens barrel, the collimating mirror axis is coaxial with photodetector and catoptron, laser driver and DSP signal processor are encapsulated in separately in the instrument box jointly, connect with photodetector and collimating mirror respectively by cable and optical fiber; Be provided with dustproof sheet between laser instrument collimating mirror and photodetection, dustproof sheet is fixed on the lens barrel.
Real time sensor is moved in the remote measurement of rock gas or toxic gas, the centre frequency of laser instrument near 1.65um, and through overscanning and the emission laser Sine Modulated.
The focal length of little coke ratio catoptron is 60mm.
Compared with the prior art the present invention has the following advantages:
Mobile remote sensing monitoring: traditional sensor is a kind of static monitoring technology, promptly a kind of monitoring technology that is fixed in the scene.Traditional need periodic maintenance, therefore for remote, complicated positions such as long defeated pipe network, complicated urban pipe networks, should not enter place such as scene and lack effective monitoring capability.The present invention be a kind of removable, need not to enter on-the-spot high sensitivity remote sensing monitoring technology.
The multiple-harmonic input: Modulating Diode Laser absorption spectrum fado adopts the second harmonic of original signal to carry out the detection of gas concentration.The different harmonic waves of this detection method utilization are proofreaied and correct the signal that is used for the inverting gas concentration to the different noises of demarcating of the reflection of noise and signal again by the noise of demarcating, thereby improve the sensitivity based on Modulating Diode Laser absorption spectroscopy sensor.
Four, description of drawings
Fig. 1-structural representation of the present invention
Fig. 2-multiple-harmonic detects the synoptic diagram of principle
1-catoptron 2-lens barrel 3-dustproof sheet 4-target reflection object 5-photodetector 6-laser instrument, collimating mirror 7-DSP signal processor 8-laser driver among Fig. 1
The original absorption spectrum b-of a-first harmonic curve c-second harmonic curve d-third harmonic curve among Fig. 2
Five, embodiment
Be transmitted in the open space by collimating mirror 6 collimating and correctings after the optical fiber coupling through semiconductor laser modulation 6 emitted laser that laser driver 8 drives, emitted laser runs into behind the target reflection thing 4 towards periphery that the space produces diffuse scattering, and the part light of these diffuse scatterings is received by the photoelectricity receiving element.Focus on photodetector 5 photosurfaces through the catoptron 1 of little coke ratio after the diffusion light filtering that receives and be received.After digitizing, deliver DSP digital signal processor 7 and carry out the multi resonant digital demodulation, obtain a plurality of harmonic wave forms compositions of original absorption spectrum.Even-order harmonic composition even symmetry in these harmonic componentss under the ideal conditions, frequency center signal intensity is non-vanishing; Next harmonic components odd symmetry, frequency center are zero.But under the actual conditions, signal itself can be subjected to the influence of various interference, for example: background noise, edge interference etc.Shown in Fig. 2 b and d, the frequency center can be departed from zero point, by odd harmonic noise is demarcated, and even-order harmonic is deducted again, and then carry out the gas concentration information extraction and handle, provide the gas concentration information between emitting laser and the target reflection object.Dustproof sheet on the lens barrel 2 is to prevent that dust from entering catoptron, influences its reflecting effect.
Claims (4)
1, a kind of real-time mobile remote sensor is to the detection method of rock gas and toxic gas, it is characterized in that utilizing multiple-harmonic Modulating Diode Laser absorption spectroscopy, photoelectric receiving system, DSP software and hardware technology and laser drive circuit, by by semiconductor laser modulation, optical fiber, collimating mirror, filter plate, photodetector, infrared laser emission receiving element emission laser output behind Optical Fiber Transmission collimating mirror collimation that little coke ratio catoptron constitutes, after meeting the object scattering, focus on the photodetector photosurface by the mirror that is reflected after the filter plate frequency-selecting filter and to receive, then the simulating signal of photodetection is sent into the DSP signal processor processes after digitizing, provide the concentration information of rock gas to be checked between emission laser and the object or toxic gas, realization is safeguarded the safety at production scene or nonproductive scene to invading production scene or the rock gas at nonproductive scene or the continuous mobile monitoring of toxic gas.
2, a kind of rock gas or toxic gas are moved the real-time telemetry sensor, form by catoptron, lens barrel, dustproof sheet, photodetector, laser instrument, collimating mirror DSP signal processor and laser driver, it is characterized in that catoptron is installed in the left part of lens barrel, concave surface is equipped with the interface of photodetector and DSP message handler to the right in the focal spot of catoptron; The interface of laser instrument collimating mirror and laser driver is installed in the right part of lens barrel, the collimating mirror axis is coaxial with photodetector and catoptron, laser driver and DSP signal processor are encapsulated in separately in the instrument box jointly, connect with photodetector and collimating mirror respectively by cable and optical fiber; Be provided with dustproof sheet between laser instrument collimating mirror and photodetection, dustproof sheet is fixed on the lens barrel.
3, according to claim 2ly a kind of rock gas or toxic gas are moved the real-time telemetry sensor, the centre frequency that it is characterized in that laser instrument is near 1.65um, and through the Sine Modulated of overscanning and emission laser.
4, according to claim 2ly a kind of rock gas or toxic gas are moved the real-time telemetry sensor, the focal length that it is characterized in that little coke ratio catoptron is 60mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 200710014337 CN101038252A (en) | 2007-04-14 | 2007-04-14 | Method for detesting natural gas and toxic gas with real-time mobile remote sensor |
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| CN 200710014337 CN101038252A (en) | 2007-04-14 | 2007-04-14 | Method for detesting natural gas and toxic gas with real-time mobile remote sensor |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102216755A (en) * | 2008-11-14 | 2011-10-12 | 株式会社Ihi | Apparatus for determining concentration of gaseous component |
| CN103189736A (en) * | 2010-11-04 | 2013-07-03 | Iee国际电子工程股份公司 | Gas detector |
| CN103398945A (en) * | 2013-07-12 | 2013-11-20 | 河南汉威电子股份有限公司 | Adjustable laser gas remote sensing instrument and focal plane adjusting method thereof |
| CN105300912A (en) * | 2015-09-16 | 2016-02-03 | 上海安允科技有限公司 | System for monitoring a variety of dangerous gases based on absorption spectrum remote sensing technology |
| CN106290249A (en) * | 2016-10-12 | 2017-01-04 | 武汉智勤创亿信息技术有限公司 | A kind of integrated small laser gas detection components |
| CN110325839A (en) * | 2016-12-12 | 2019-10-11 | 恩伊欧监测设备有限公司 | Gas monitor |
| CN112213284A (en) * | 2020-09-21 | 2021-01-12 | 西安智光物联科技有限公司 | Self-calibration method of natural gas detector |
| CN112946232A (en) * | 2021-02-04 | 2021-06-11 | 成都秦川物联网科技股份有限公司 | Natural gas energy metering data acquisition method and system |
| CN113092416A (en) * | 2021-03-11 | 2021-07-09 | 山东安益矿用设备股份有限公司 | Gas concentration detection case in coal mine tunnel |
-
2007
- 2007-04-14 CN CN 200710014337 patent/CN101038252A/en active Pending
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102216755A (en) * | 2008-11-14 | 2011-10-12 | 株式会社Ihi | Apparatus for determining concentration of gaseous component |
| CN103189736A (en) * | 2010-11-04 | 2013-07-03 | Iee国际电子工程股份公司 | Gas detector |
| CN103189736B (en) * | 2010-11-04 | 2016-01-20 | Iee国际电子工程股份公司 | Detector |
| CN103398945A (en) * | 2013-07-12 | 2013-11-20 | 河南汉威电子股份有限公司 | Adjustable laser gas remote sensing instrument and focal plane adjusting method thereof |
| CN103398945B (en) * | 2013-07-12 | 2015-09-23 | 河南汉威电子股份有限公司 | Adjustable laser gas remote measurement instrument and focal plane method of adjustment thereof |
| CN105300912B (en) * | 2015-09-16 | 2017-11-24 | 上海安允科技有限公司 | A variety of monitoring of hazardous gas systems based on absorption spectrum remote sensing technology |
| CN105300912A (en) * | 2015-09-16 | 2016-02-03 | 上海安允科技有限公司 | System for monitoring a variety of dangerous gases based on absorption spectrum remote sensing technology |
| CN106290249A (en) * | 2016-10-12 | 2017-01-04 | 武汉智勤创亿信息技术有限公司 | A kind of integrated small laser gas detection components |
| CN110325839A (en) * | 2016-12-12 | 2019-10-11 | 恩伊欧监测设备有限公司 | Gas monitor |
| CN110325839B (en) * | 2016-12-12 | 2022-06-14 | 恩伊欧监测设备有限公司 | Gas monitor |
| CN112213284A (en) * | 2020-09-21 | 2021-01-12 | 西安智光物联科技有限公司 | Self-calibration method of natural gas detector |
| CN112946232A (en) * | 2021-02-04 | 2021-06-11 | 成都秦川物联网科技股份有限公司 | Natural gas energy metering data acquisition method and system |
| CN113092416A (en) * | 2021-03-11 | 2021-07-09 | 山东安益矿用设备股份有限公司 | Gas concentration detection case in coal mine tunnel |
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