CN110006610A - A kind of natural gas leaking detection method and device - Google Patents
A kind of natural gas leaking detection method and device Download PDFInfo
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- CN110006610A CN110006610A CN201910328622.XA CN201910328622A CN110006610A CN 110006610 A CN110006610 A CN 110006610A CN 201910328622 A CN201910328622 A CN 201910328622A CN 110006610 A CN110006610 A CN 110006610A
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D5/00—Protection or supervision of installations
- F17D5/02—Preventing, monitoring, or locating loss
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/38—Investigating fluid-tightness of structures by using light
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- 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
- G01N21/39—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using tunable lasers
Abstract
The invention discloses a kind of natural gas leaking detection method and device, the device includes that sampling device, generating device of laser, beam shaping and isolating device, laser decline and swings detection device, data processing and control device, sampling device, which is connected to the laser and declines, swings detection device, swings in detection device under test gas to be introduced into the laser and decline；The light-emitting window of generating device of laser is connected to the beam shaping and isolating device；Laser, which declines, to be swung the output end of detection device and is connected to the data processing and control device, be input to the laser decline the light beam swung in detection device declined swing chamber processing after be transmitted to the data processing and control device；Data processing and control device obtain the concentration of the under test gas by detecting the ring-down time of light beam.The above method and device detection speed are fast, detection accuracy is high and detection range is wide, can be used for natural gas line inspection and leak detection.
Description
Technical field
The present invention relates to detection of natural gas technical field more particularly to a kind of natural gas leaking detection method and device.
Background technique
Natural gas line is the main carriers for transmitting natural gas, due to erosion of the natural gas in terms of pipeline and temperature,
The influence of pressure or other external factor, causes seal for pipe joints to be broken down, to leakage phenomenon occur.The natural gas of high concentration
Can not only have an adverse effect to human health, but also excessively high ratio regular meeting sets off an explosion the generation of phenomenon, makes the life of people
Property safety is seriously threatened.
In prior art, the detection method of natural gas leaking mainly has method of direct observation, detection ball, pressure spot point
Analysis method, acoustic emission detection method, laser telemetry method etc., specifically:
Method of direct observation: carrying out the inspection work of entire pipeline dependent on veteran natural gas line staff,
The problem of whether there is leakage along natural gas line is judged by way of checking.Though such detection method effect is direct,
But it cannot achieve the continuity and dynamic of detection, therefore less use.
Detection ball: it is detected inside natural gas line using detection ball.During this by ultrasound, with
And the application of leakage field technology, determine the current intelligence of natural gas line.It will form more data in entire detection process, after
Phase by the processing to data, can obtain including natural gas line whether burn into whether perforate including a variety of key messages.
It is advantageous that accuracy is high, easy to operate, but detection ball is disadvantageous in that it is possible that blocking natural gas line is asked
Topic.
Pressure spot analytic approach: if leakage problem has occurred in natural gas line, it will lead to originally balanced pressure state hair
Raw to change, this can generate one kind using sound wave as medium in the process, the expansion wave propagated along natural gas line.Expansion wave is in transmitting
Destabilization problems present in each point pressure change can be reacted.The principle that applying pressure point analysis method carries out leak detection just exists
In: in multiple pressure detecting points are arranged in natural gas line, by way of analysis pressure value and predetermined value difference, calculate pressure
Power fall time is poor, and then calculates specific leakage point point.This method do not account for temperature to the viscosity of fluid in pipeline, rub
The influence of the parameters such as resistance and density, and pressure is nonlinear along pipeline under actual conditions, therefore the positioning accuracy is lower.
Acoustic emission testing technology: can generate small leakage sound source when there is gas leakage at pipeline point, utilization is small
Wave packet analytic approach under sound emission its reveal sound in time domain scale with the sound field characteristics in frequency domain, judge to manage with this
Line, which has No leakage and lets out signal, carries out certain noise reduction process, and sound emission theory is recycled to determine with signal analysis treating method
In certain slip leak rate size, corresponding maintenance measures are taken according to judging result.It is detected using acoustic emission testing technology
The leakage of pipeline has many advantages, such as that on-line checking, detection accuracy are high, the disadvantage is that detecting distance is short.
Laser telemetry method: this kind of instrument is that new type of high sensitivity measuring instrument has not by the interference of other gas componants
Detecting distance is imitated up to tens meters, when measurement, laser detector can be directed toward to region to be measured, such as the reverberation after pipeline, earth's surface,
It is dense come the integral absorption for measuring the methane gas on reflection path that survey meter receives the laser beam being reflected back by leakage air mass
Degree.Telemetry be easy by transmitting outside environmental elements, as temperature, humidity, illumination influence, furthermore in multi-component situation
Testing result will receive limitation.
Summary of the invention
The object of the present invention is to provide a kind of natural gas leaking detection method and device, this method and device detect speed
Fastly, detection accuracy is high and detection range is wide, can be used for natural gas line inspection and leak detection.
The purpose of the present invention is what is be achieved through the following technical solutions:
A kind of natural gas leaking detection device, described device include sampling device, generating device of laser, beam shaping and every
It declines from device, laser and swings detection device, data processing and control device, in which:
The sampling device, which is connected to the laser and declines, swings detection device, declines under test gas to be introduced into the laser
It swings in detection device；
The light-emitting window of the generating device of laser is connected to the beam shaping and isolating device, which produces
Raw light beam is input to the laser and declines after the beam shaping and isolating device processing to be swung in detection device；
The laser, which declines, to be swung the output end of detection device and is connected to the data processing and control device, is input to and described is swashed
Light decay swing the light beam in detection device declined swing chamber processing after be transmitted to the data processing and control device；
The data processing and control device acquire the beam shaping and isolating device respectively treated original beam
Data and the laser decline to swing detection device treated to decline swings beam data, and the ring-down time by detecting light beam obtains
The concentration of the under test gas.
Described device further includes weather conditions detection device and positioning device, in which:
The weather conditions detection device is connected to the data processing and control device, in the data processing and
When control device checks beam data, the wind speed, wind direction, height above sea level, data of the Temperature and Humidity module of test point are provided, are
The foundation of gas diffusion model provides data and supports；
The positioning device is connected to the data processing and control device, for obtaining the latitude and longitude information of test point,
And the specific geographic azimuth information of leakage point when leaking is obtained in conjunction with established gas diffusion model.
The sampling device specifically includes filter, drier and gas-recycling plant, in which:
The filter is used to filter particulate matter under test gas, prevents from being attached to declining and swings intracavitary, produces to testing result
It is raw to influence；
The drier is used to absorb vapor under test gas, prevents from being condensate in declining and swings intracavitary, produces to testing result
It is raw to influence, it is also used for heating cavity, prevents gas from condensing；
The gas-recycling plant is used for the circulating sampling of under test gas.
The generating device of laser specifically includes semiconductor tunable laser group, laser drive unit, temperature control unit
And combined beam unit, in which:
The semiconductor tunable laser group includes more than one semiconductor tunable laser, a variety of when needing to detect
When soluble gas, corresponding semiconductor tunable laser is selected according to the absorption line of gas with various；
The laser drive unit is used to carry out drive control to the semiconductor tunable laser group；
The temperature control unit is used to carry out temperature control to the semiconductor tunable laser group, to control output
Wavelength；
The combined beam unit is used for when comprising more than more than one laser in the semiconductor tunable laser group
It carries out closing beam output；When only detecting a certain gas, then do not need to utilize combined beam unit.
The beam shaping and isolating device specifically include that beam shaping unit, light beam isolated location and light splitting detection are single
Member, in which:
The beam shaping unit is used for the light to the semiconductor tunable laser group output in the generating device of laser
Shu Jinhang collimation；
The light beam isolated location is for preventing influence of the reflected light to semiconductor tunable laser group and stray light；
The light splitting detection unit, which is used to separate part light by least one side spectroscope, synchronizes detection, or according to dividing
Light is than carrying out power detection.
It includes to decline to swing Cavity unit, pattern matching unit, monitoring and temperature conditioning unit that the laser, which declines and swings detection device specifically,
Wherein:
Described decline swings Cavity unit by the cavity body structure for sealing and for the muti-piece optic reflecting component group of reflected light
At incident beam multi-way between multiple optic reflecting components reflects, and effectively absorbs light path to increase, improves detection accuracy；
The pattern matching unit is used to that incident beam and described decline to be swung Cavity unit and carried out by least a piece of lens
Pattern match, to improve detection accuracy；
The monitoring and temperature conditioning unit are used to detect described decline and swing the pressure of gas in Cavity unit, and decline and swing described in control
The temperature of Cavity unit.
Described device further includes pressure control device, and the pressure control device is set to the sampling device and laser declines
It swings between detection device, for the on-off control by gas pressure pump and valve body, controls the laser and decline and swing in detection device
Decline the pressure swung in Cavity unit, it is made to be stable at a fixed range.
Described device further includes gas discharging apparatus, which, which is connected to the laser and declines, swings detection device,
Equipment is given off for the gas after will test, and prevents other gases from swinging Cavity unit into declining by discharge-channel.
A kind of natural gas leaking detection method, which comprises
Under test gas is introduced into laser and declined and swung in detection device by step 1；
Step 2, the light beam generated by generating device of laser are input to described after beam shaping and isolating device processing
Laser, which declines, to be swung in detection device；
Step 3, be input to the laser decline the light beam swung in detection device declined again swing chamber processing；
Step 4 acquires the beam shaping and isolating device respectively treated original beam data and the laser declines
It swings detection device treated to decline and swing beam data, obtain the dense of the under test gas by detecting the ring-down time of light beam
Degree.
During step 4 is implemented, the method also includes:
When being checked to beam data, using weather conditions detection device provide the wind speed of test point, wind direction,
Height above sea level, data of the Temperature and Humidity module provide data support for the foundation of gas diffusion model；
Leakage when obtaining the latitude and longitude information of test point again, and established gas diffusion model acquisition being combined to leak
The specific geographic azimuth information of point.
As seen from the above technical solution provided by the invention, the above method and device detection speed is fast, detection accuracy
High and detection range is wide, can be used for natural gas line inspection and leak detection.
Detailed description of the invention
In order to illustrate the technical solution of the embodiments of the present invention more clearly, required use in being described below to embodiment
Attached drawing be briefly described, it should be apparent that, drawings in the following description are only some embodiments of the invention, for this
For the those of ordinary skill in field, without creative efforts, it can also be obtained according to these attached drawings other
Attached drawing.
Fig. 1 is natural gas leaking structure of the detecting device schematic diagram provided in an embodiment of the present invention；
Fig. 2 provides the flow diagram of natural gas leaking detection method by the embodiment of the present invention.
Specific embodiment
With reference to the attached drawing in the embodiment of the present invention, technical solution in the embodiment of the present invention carries out clear, complete
Ground description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.Based on this
The embodiment of invention, every other implementation obtained by those of ordinary skill in the art without making creative efforts
Example, belongs to protection scope of the present invention.
The embodiment of the present invention is described in further detail below in conjunction with attached drawing, is implemented as shown in Figure 1 for the present invention
The natural gas leaking structure of the detecting device schematic diagram that example provides, described device mainly includes sampling device, generating device of laser, light
Beam shaping and isolating device, laser, which decline, swings detection device, data processing and control device, in which:
The sampling device, which is connected to the laser and declines, swings detection device, declines under test gas to be introduced into the laser
It swings in detection device；
The light-emitting window of the generating device of laser is connected to the beam shaping and isolating device, which produces
Raw light beam is input to the laser and declines after the beam shaping and isolating device processing to be swung in detection device；
The laser, which declines, to be swung the output end of detection device and is connected to the data processing and control device, is input to and described is swashed
Light decay swing the light beam in detection device declined swing chamber processing after be transmitted to the data processing and control device；
The data processing and control device acquire the beam shaping and isolating device respectively treated original beam
Data and the laser decline to swing detection device treated to decline swings beam data, and the ring-down time by detecting light beam obtains
The concentration of the under test gas.In the specific implementation, the data processing and control device can store the detection data of acquisition,
It is analyzed and processed, the information such as data, instrument operating parameter, real-time status parameter can also be will test and passed through according to the agreement of regulation
External interface externally transmits.
In the specific implementation, as shown in Figure 1, described device may also include weather conditions detection device and positioning device, in which:
The weather conditions detection device is connected to the data processing and control device, in the data processing and
When control device checks beam data, the wind speed, wind direction, height above sea level, data of the Temperature and Humidity module of test point are provided, are
The foundation of gas diffusion model provides data and supports；
The positioning device is connected to the data processing and control device, for obtaining the latitude and longitude information of test point,
And the specific geographic azimuth information of leakage point when leaking is obtained in conjunction with established gas diffusion model.
Further, above-mentioned sampling device specifically includes filter, drier and gas-recycling plant, in which:
The filter is used to filter particulate matter under test gas, prevents from being attached to declining and swings intracavitary, produces to testing result
It is raw to influence；
The drier is used to absorb vapor under test gas, prevents from being condensate in declining and swings intracavitary, produces to testing result
It is raw to influence, it is also used for heating cavity, prevents gas from condensing；
The gas-recycling plant is used for the circulating sampling of under test gas.
Further, above-mentioned generating device of laser specifically includes semiconductor tunable laser group, laser drive unit, temperature
Control unit and combined beam unit, in which:
The semiconductor tunable laser group includes more than one semiconductor tunable laser, a variety of when needing to detect
When soluble gas, corresponding semiconductor tunable laser is selected according to the absorption line of gas with various；
The laser drive unit is used to carry out drive control to the semiconductor tunable laser group；
The temperature control unit is used to carry out temperature control to the semiconductor tunable laser group, to control output
Wavelength；
The combined beam unit is used for when comprising more than more than one laser in the semiconductor tunable laser group
It carries out closing beam output；When only detecting a certain gas, then do not need to utilize combined beam unit.
Further, the beam shaping and isolating device specifically include beam shaping unit, light beam isolated location and divide
Optical detecting unit, in which:
The beam shaping unit is used for the light to the semiconductor tunable laser group output in the generating device of laser
Shu Jinhang collimation；
The light beam isolated location is for preventing influence of the reflected light to semiconductor tunable laser group and stray light；
The light splitting detection unit, which is used to separate part light by least one side spectroscope, synchronizes detection, or according to dividing
Light is than carrying out power detection.
Further, the laser decline swing detection device specifically and include decline swing Cavity unit, pattern matching unit, monitoring and
Temperature conditioning unit, in which:
Described decline swings Cavity unit by the cavity body structure for sealing and for the muti-piece optic reflecting component group of reflected light
At hysteroscope is made of according to different designs more than one optic reflecting component；The optic reflecting component is not limited to
The eyeglass of high reflectance, also comprising realizing that optical path is turned back the prism of reflection；Incident beam is more between multiple optic reflecting components
Journey reflection effectively absorbs light path to increase, improves detection accuracy；
The pattern matching unit is used to that incident beam and described decline to be swung Cavity unit and carried out by least a piece of lens
Pattern match, to improve detection accuracy；
The monitoring and temperature conditioning unit are used to detect described decline and swing the pressure of gas in Cavity unit, and decline and swing described in control
The temperature of Cavity unit.
In addition, the pressure control device is set to institute as shown in Figure 1, described device may also include pressure control device
It states sampling device and laser declines and swings between detection device, for being controlled by the on-off of gas pressure pump and valve body, described in control
Laser declines the pressure for swinging and declining and being swung in Cavity unit in detection device, it is made to be stable at a fixed range.In the specific implementation, should
It is also not necessary to directly be introduced into laser and decline and swing in detection device pressure control device by the gas of the atmospheric pressure of tested point
Decline to swing in Cavity unit and detected, and declined by laser and to swing detection device pressure sensing cell and obtain gas pressure, to detection
As a result pressure correction is carried out.
As shown in Figure 1, described device may also include gas discharging apparatus, which is connected to the laser and declines
Detection device is swung, gives off equipment for the gas after will test, and prevents other gases from swinging chamber into declining by discharge-channel
Body unit.
Sample detection formula can be used in the detection of above-mentioned apparatus, i.e., under test gas is introduced detection device by sampling device,
Precise measurement is carried out to gas componant to be measured；Gas nature exchanged form can also be used, i.e., in natural diffuseness to detection device
Gas detected.
Meanwhile the device not only can detecte one of natural gas ingredient, pass through multi-component while timesharing inspection
It surveys, compares the component of natural gas, can shield due to industrial generation, vehicle exhaust, the naturally interference such as discharge, it is reliable to increase detection
Property.
Based on described device, the embodiment of the invention also provides a kind of natural gas leaking detection method, it is illustrated in figure 2 this
The flow diagram of inventive embodiments institute providing method, which comprises
Under test gas is introduced into laser and declined and swung in detection device by step 1；
Step 2, the light beam generated by generating device of laser are input to described after beam shaping and isolating device processing
Laser, which declines, to be swung in detection device；
Step 3, be input to the laser decline the light beam swung in detection device declined again swing chamber processing；
Step 4 acquires the beam shaping and isolating device respectively treated original beam data and the laser declines
It swings detection device treated to decline and swing beam data, obtain the dense of the under test gas by detecting the ring-down time of light beam
Degree.
In addition, during step 4 is implemented, the method also includes:
When being checked to beam data, using weather conditions detection device provide the wind speed of test point, wind direction,
Height above sea level, data of the Temperature and Humidity module provide data support for the foundation of gas diffusion model；
Leakage when obtaining the latitude and longitude information of test point again, and established gas diffusion model acquisition being combined to leak
The specific geographic azimuth information of point.
The connection of device involved by each step of the above method and the course of work are as described in above-mentioned apparatus embodiment.
It is worth noting that, the content being not described in detail in the embodiment of the present invention belongs to professional and technical personnel in the field's public affairs
The prior art known.
In conclusion the method for the embodiment of the present invention and device can be applied in vehicle-mounted, airborne, fixed point arrangement or letter
In easy mobile device, by detection path or the variation of the gas concentration of set-point, the weather conditions of binding test point pass through
The position of leakage point is extrapolated in the analysis of model of atmospheric diffusion, and device detection speed is fast, detection accuracy is high and detection range
Extensively, it can be used for natural gas line inspection and leak detection.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
Within the technical scope of the present disclosure, any changes or substitutions that can be easily thought of by anyone skilled in the art,
It should be covered by the protection scope of the present invention.Therefore, protection scope of the present invention should be with the protection model of claims
Subject to enclosing.
Claims (10)
1. a kind of natural gas leaking detection device, which is characterized in that described device includes sampling device, generating device of laser, light
Beam shaping and isolating device, laser, which decline, swings detection device, data processing and control device, in which:
The sampling device, which is connected to the laser and declines, swings detection device, swings inspection under test gas to be introduced into the laser and decline
It surveys in device；
The light-emitting window of the generating device of laser is connected to the beam shaping and isolating device, what which generated
Light beam is input to the laser and declines after the beam shaping and isolating device processing to be swung in detection device；
The laser, which declines, to be swung the output end of detection device and is connected to the data processing and control device, is input to the laser and is declined
Swing the light beam in detection device declined swing chamber processing after be transmitted to the data processing and control device；
The data processing and control device acquire the beam shaping and isolating device respectively treated original beam data
It declines to swing detection device treated to decline with the laser and swings beam data, and the ring-down time by detecting light beam is described to obtain
The concentration of under test gas.
2. natural gas leaking detection device according to claim 1, which is characterized in that described device further includes weather conditions inspection
Survey device and positioning device, in which:
The weather conditions detection device is connected to the data processing and control device, in the data processing and control
When device checks beam data, the wind speed, wind direction, height above sea level, data of the Temperature and Humidity module of test point are provided, is gas
The foundation of diffusion model provides data and supports；
The positioning device is connected to the data processing and control device, for obtaining the latitude and longitude information of test point, and ties
Close the specific geographic azimuth information that established gas diffusion model obtains leakage point when leaking.
3. natural gas leaking detection device according to claim 1, which is characterized in that the sampling device specifically includes filtering
Device, drier and gas-recycling plant, in which:
The filter is used to filter particulate matter under test gas, prevents from being attached to declining and swings intracavitary, generates shadow to testing result
It rings；
The drier is used to absorb vapor under test gas, prevents from being condensate in declining and swings intracavitary, generates shadow to testing result
It rings, is also used for heating cavity, prevents gas from condensing；
The gas-recycling plant is used for the circulating sampling of under test gas.
4. natural gas leaking detection device according to claim 1, which is characterized in that the generating device of laser specifically includes
Semiconductor tunable laser group, laser drive unit, temperature control unit and combined beam unit, in which:
The semiconductor tunable laser group includes more than one semiconductor tunable laser, a variety of solvable when needing to detect
Property gas when, corresponding semiconductor tunable laser is selected according to the absorption line of gas with various；
The laser drive unit is used to carry out drive control to the semiconductor tunable laser group；
The temperature control unit is used to carry out temperature control to the semiconductor tunable laser group, to control output wave
It is long；
The combined beam unit is used for when the when progress that comprises more than more than one laser in the semiconductor tunable laser group
Close beam output；When only detecting a certain gas, then do not need to utilize combined beam unit.
5. natural gas leaking detection device according to claim 1, which is characterized in that the beam shaping and isolating device tool
Body includes beam shaping unit, light beam isolated location and light splitting detection unit, in which:
The beam shaping unit be used for in the generating device of laser semiconductor tunable laser group output light beam into
Row collimation；
The light beam isolated location is for preventing influence of the reflected light to semiconductor tunable laser group and stray light；
The light splitting detection unit synchronizes detection for separating part light by least one side spectroscope, or according to splitting ratio
Carry out power detection.
6. natural gas leaking detection device according to claim 1, which is characterized in that the laser declines, and to swing detection device specific
Cavity unit, pattern matching unit, monitoring and temperature conditioning unit are swung comprising declining, in which:
Described decline is swung Cavity unit and is made of the cavity body structure for sealing and the muti-piece optic reflecting component for reflected light, enters
Irradiating light beam multi-way between multiple optic reflecting components reflects, and effectively absorbs light path to increase, improves detection accuracy；
The pattern matching unit is used to swinging Cavity unit and carrying out mode by least a piece of lens incident beam and described decline
Matching, to improve detection accuracy；
The monitoring and temperature conditioning unit are used to detect described decline and swing the pressure of gas in Cavity unit, and decline described in control and swing cavity
The temperature of unit.
7. natural gas leaking detection device according to claim 1, which is characterized in that described device further includes pressure control dress
It sets, the pressure control device is set to the sampling device and laser declines and swings between detection device, for passing through gas pressure
The on-off of pump and valve body controls, and controls the laser and declines the pressure for swinging and declining and being swung in Cavity unit in detection device, is stable at it
One fixed range.
8. natural gas leaking detection device according to claim 1, which is characterized in that described device further includes gas discharge dress
It sets, which, which is connected to the laser and declines, swings detection device, gives off equipment for the gas after will test, and prevent
Only other gases enter to decline by discharge-channel swings Cavity unit.
9. a kind of natural gas leaking detection method, which is characterized in that the described method includes:
Under test gas is introduced into laser and declined and swung in detection device by step 1；
Step 2, the light beam generated by generating device of laser are input to the laser after beam shaping and isolating device processing
It declines and swings in detection device；
Step 3, be input to the laser decline the light beam swung in detection device declined again swing chamber processing；
Step 4 acquires the beam shaping and isolating device respectively treated original beam data and the laser declines and swings inspection
It surveys device treated and decline and swing beam data, obtain the concentration of the under test gas by detecting the ring-down time of light beam.
10. natural gas leaking detection method according to claim 9, which is characterized in that during step 4 is implemented, institute
State method further include:
When checking to beam data, wind speed, wind direction, the height above sea level of test point are provided using weather conditions detection device
Highly, data of the Temperature and Humidity module provides data support for the foundation of gas diffusion model；
The latitude and longitude information of test point is obtained again, and established gas diffusion model is combined to obtain leakage point when leaking
Specific geographic azimuth information.
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