CN109632671B - Speed and concentration compensation method and device in laser gas remote measurement - Google Patents
Speed and concentration compensation method and device in laser gas remote measurement Download PDFInfo
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- 238000005259 measurement Methods 0.000 title claims abstract description 12
- 238000000034 method Methods 0.000 title description 5
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 50
- 238000010183 spectrum analysis Methods 0.000 claims abstract description 14
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 claims abstract description 10
- 238000004364 calculation method Methods 0.000 claims description 6
- 235000013405 beer Nutrition 0.000 claims description 3
- 230000035484 reaction time Effects 0.000 claims description 3
- 238000001514 detection method Methods 0.000 abstract description 13
- 238000005516 engineering process Methods 0.000 abstract description 3
- 238000007689 inspection Methods 0.000 description 10
- 230000007547 defect Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
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- G—PHYSICS
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- 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
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- 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
- G01N21/35—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
- G01N2021/3545—Disposition for compensating effect of interfering gases
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Abstract
The invention relates to a device for compensating speed and concentration in laser gas remote measurement, relating to the technology of photoelectric gas detection instruments, and comprising a laser generator, a laser detector, a spectrum analysis module, a threshold setting module, a speed and concentration compensation module, an alarm signal generation module and other general modules; other common modules include a power module; the device can realize continuous detection and positioning of methane leakage in a horizontal scanning mode by being attached to the ground on the premise of specifying the size of a detected air mass and determining the running speed of the device by gas testing, has the characteristics of continuity, instantaneity and mobility, greatly improves the efficiency of the methane gas leakage point, is suitable for being arranged on electric bicycles and small-sized motor vehicles, and is also suitable for being arranged on trolleys.
Description
Technical Field
The invention relates to a photoelectric gas detection technology.
Background
The routing inspection of the urban gas pipeline is a permanent subject, along with the continuous development of urban construction, leakage inspection and routing inspection are required for both a historical pipe network and a newly-built pipe network, and the routing inspection method is more important for the safe use of gas in super-large cities and with high population density.
Taking Beijing as an example, the leakage of the existing high-pressure pipe network is checked, and the branch level basic unit of a gas company mainly faces to the urban medium and low-pressure pipelines. The medium and low pressure pipelines are mainly distributed in the areas of streets, alleys, small street lanes, residential quarters and the like in cities, and are used for large-scale detection of motor vehicles in regions where the motor vehicles cannot run. The walking cart-type gas leakage inspection instrument used by people at present has the problem of large hysteresis effect, so that the efficiency of inspecting leakage of a pipe network is low. According to the data tracking of the whole year of operation and maintenance, the leakage rate of the municipal road pipe network is about 22%, the leakage rate of the low-pressure courtyard pipe network is about 78%, and therefore the leakage frequency of the low-pressure courtyard pipe network is still very high. And most of courtyard line leakage is in residential areas, so that social influence is large. Therefore, the accuracy of low-pressure yard line leakage positioning and how to improve the leakage inspection efficiency ratio are all problems to be solved urgently.
The existing trolley type gas leakage inspection instrument mainly has the following defects:
firstly, the gas detection technology is electrochemical or thermocatalytic, has the defect of long response time, generally within 20-30 seconds, and thus has larger hysteresis;
secondly, the gas detection mode is that the gas is extracted to a detection device for analysis;
thirdly, a gas sensing mode: the method belongs to a point type sensing mode, and after the small trolley walks and is detected, a line, namely the walking track of the small trolley is detected;
fourthly, the small trolley inspection speed is relatively slow, the actual used traveling speed is only 3 kilometers per hour probably, and serious hysteresis exists.
The existing hand-held laser gas detector has the following main defects:
because the leaked gas is influenced by the flowing air flow of the environment, the method for improving the detection accuracy only bends down to be close to the ground as much as possible to detect when the handheld laser gas detector is used for routing inspection.
If the hand-held laser gas detection device is installed on a motor vehicle which is 10cm away from the ground, including an electric bicycle and a small automobile, the detection accuracy can be improved by being close to the ground, but the speed influences the concentration of the gas after diffuse reflection, so that the hand-held laser gas detection device cannot be directly applied.
Description of the prior art
The device response time refers to the time difference between the time when the electronic device receives the measurement start signal and the time when the electronic device starts to operate according to the received measurement start signal, and the time difference is caused by the internal circuit of the electronic device, and the specific measurement method is disclosed in patent application CN201810404213.9, which is a device response time measurement system.
Disclosure of Invention
In view of the defects of the prior art, the device for compensating the speed and the concentration in the laser gas remote measurement consists of a laser generator, a laser detector, a spectrum analysis module, a threshold setting module, a speed and concentration compensation module, an alarm signal generation module and other general modules; other common modules include a power module;
the power supply module is used for supplying power to the laser generator, the laser detector, the spectrum analysis module, the threshold setting module, the speed and concentration compensation module and the alarm signal generation module;
the laser generator is used for generating laser beams with the wavelength of 1653nm, the energy is less than 10mw, and the line width is 2 MHz;
the laser detector is used for receiving the laser beam with the wavelength of 1653nm returned by diffuse reflection and transmitting the returned laser beam to the spectrum analysis module;
the spectrum analysis module calculates the concentration n of the methane gas according to the beer Lambert law and the intensity of the laser emitted by the laser generator and the intensity of the laser received by the laser detector, and transmits the concentration n of the methane gas to the speed and concentration compensation module;
a speed and concentration compensation module for performing compensation calculation on the received methane gas concentration n and obtaining the compensated methane gas concentration n0(ii) a The compensation calculation method comprises the following steps: setting a compensation coefficient as k, equipment response time as t, air mass length as L, electric vehicle speed as v and actual reaction time as t0，t0=L/v，k=t0T = L/vt; n when k is 1 or less0= n/k, n being greater than 10= n; the speed and concentration compensation module will n0Sending the alarm signal to an alarm signal generating module;
the threshold setting module is used for setting the speed v of the electric vehicle, the response time t of equipment, the length L of a measured air group and the methane concentration threshold N;
the alarm signal generation module compares the methane concentration threshold N with the compensated methane gas concentration N0When n is0And when the N is greater than N, generating an alarm signal.
Advantageous effects
The device for speed and concentration compensation in laser gas remote measurement can realize continuous methane leakage detection and positioning in a horizontal scanning mode by being attached to the ground on the premise of specifying the size of a measured gas mass and determining the running speed of the device, has the characteristics of continuity, instantaneity and mobility, and greatly improves the inspection efficiency of methane gas leakage points.
Drawings
FIG. 1 is a schematic structural view of the present invention;
a is a device for compensating speed and concentration in laser gas remote measurement; b is the measured gas mass; c is an obstacle;
1 is a laser generator; 2 is a laser detector; 3 is a spectral analysis module; 4 is a threshold setting module; 5 is a speed and concentration compensation module; and 6 is an alarm signal generating module.
Detailed description of the invention
Referring to fig. 1, the speed and concentration compensation device a for laser gas remote sensing of the present invention, which emits laser with a wavelength of 1653nm in motion, returns to the position of the speed and concentration compensation device a for laser gas remote sensing by diffuse reflection via a detected gas mass B and an obstacle C in motion, is composed of a laser generator 1, a laser detector 2, a spectrum analysis module 3, a threshold setting module 4, a speed and concentration compensation module 5, an alarm signal generation module 6, and other general modules 7; the other generic modules 7 comprise a power supply module 71;
the power supply module 71 is used for supplying power to the laser generator 1, the laser detector 2, the spectrum analysis module 3, the threshold setting module 4, the speed and concentration compensation module 5 and the alarm signal generation module 6;
the laser generator 1 is used for generating laser beams with the wavelength of 1653nm, the energy is less than 10mw, and the line width is 2 MHz;
the laser detector 2 is used for receiving the laser beam with the wavelength of 1653nm returned by diffuse reflection and transmitting the returned laser beam to the spectrum analysis module 3;
the spectrum analysis module 3 calculates the concentration n of the methane gas according to the beer Lambert law and the intensity of the laser emitted by the laser generator 1 and the intensity of the laser received by the laser detector 2, and transmits the concentration n of the methane gas to the speed and concentration compensation module 5;
a speed and concentration compensation module 5 for performing compensation calculation on the received methane gas concentration n and obtaining the compensated methane gas concentration n0(ii) a The compensation calculation method comprises the following steps: setting a compensation coefficient as k, equipment response time as t, air mass length as L, electric vehicle speed as v and actual reaction time as t0，t0=L/v，k=t0T = L/vt; n when k is 1 or less0= n/k, n being greater than 10= n; the speed and concentration compensation module will n0Sending the alarm signal to an alarm signal generating module;
the threshold setting module is used for setting the speed v of the electric vehicle, the response time t of equipment, the length L of a measured air group and the methane concentration threshold N;
the alarm signal generation module compares the methane concentration threshold N with the compensated methane gas concentration N0When n is0And when the N is greater than N, generating an alarm signal.
The set air mass length L determines how large an air mass is detected, and the smaller the value of L is set, the smaller the air mass can be detected, which means the higher the detection accuracy in motion.
The response time of the equipment is mainly influenced by the speed of signal transmission among modules, after the device A for compensating the speed and the concentration in laser gas remote measurement is manufactured, the corresponding time of the whole equipment is determined as the response time t of the equipment by carrying out fixed-point scanning on the air mass in situ, namely under the experimental condition and under the static non-moving condition, the difference value between the moment of emitting laser and the moment of generating an alarm signal is recorded as the response time t of the equipment by using the device A for compensating the speed and the concentration in the manufactured laser gas remote measurement.
Claims (1)
1. The device for compensating the speed and the concentration in the laser gas remote measurement is characterized by consisting of a laser generator, a laser detector, a spectrum analysis module, a threshold setting module, a speed and concentration compensation module, an alarm signal generation module and other general modules; other common modules include a power module;
the power supply module is used for supplying power to the laser generator, the laser detector, the spectrum analysis module, the threshold setting module, the speed and concentration compensation module and the alarm signal generation module;
the laser generator is used for generating laser beams with the wavelength of 1653nm, the energy is less than 10mw, and the line width is 2 MHz;
the laser detector is used for receiving the laser beam with the wavelength of 1653nm returned by diffuse reflection and transmitting the returned laser beam to the spectrum analysis module;
the spectrum analysis module calculates the concentration n of the methane gas according to the beer Lambert law and the intensity of the laser emitted by the laser generator and the intensity of the laser received by the laser detector, and transmits the concentration n of the methane gas to the speed and concentration compensation module;
a speed and concentration compensation module for performing compensation calculation on the received methane gas concentration n and obtaining the compensated methane gas concentration n0(ii) a The compensation calculation method comprises the following steps: setting a compensation coefficient as k, equipment response time as t, air mass length as L, electric vehicle speed as v and actual reaction time as t0，t0=L/v，k=t0T = L/vt; n when k is 1 or less0= n/k, n being greater than 10= n; the speed and concentration compensation module will n0Sending the alarm signal to an alarm signal generating module;
the threshold setting module is used for setting the speed v of the electric vehicle, the response time t of equipment, the length L of a measured air group and the methane concentration threshold N;
the alarm signal generation module compares the methane concentration threshold N with the compensated methane gas concentration N0When n is0And when the N is greater than N, generating an alarm signal.
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Effective date of registration: 20220427 Address after: 310052 No. 1186-1 Bin'an Road, Binjiang District, Hangzhou City, Zhejiang Province Patentee after: HANGZHOU INNOVER TECHNOLOGY Co.,Ltd. Address before: 100190 Room 101, office building 7, Zhongguancun South 2nd Street, Haidian District, Beijing Patentee before: BEIJING HANGXING NETWORKING CO.,LTD. |