CN106323878A - Laser remote sensing detector for natural gas concentration and distance - Google Patents
Laser remote sensing detector for natural gas concentration and distance Download PDFInfo
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- CN106323878A CN106323878A CN201610643098.1A CN201610643098A CN106323878A CN 106323878 A CN106323878 A CN 106323878A CN 201610643098 A CN201610643098 A CN 201610643098A CN 106323878 A CN106323878 A CN 106323878A
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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
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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
- G01N2021/1793—Remote sensing
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Abstract
The invention discloses a laser remote sensing detector for natural gas concentration and distance. The detector comprises infrared laser transmitting and receiving components and a control processing component electrically connected with the infrared laser transmitting and receiving components; particularly, the control processing component comprises a transmitting signal control assembly and a receiving signal processing assembly which are electrically connected; the transmitting signal control assembly is used for achieving modulation of output of a laser (7) in the infrared laser transmitting component; the receiving signal processing assembly comprises a distance signal processing unit and a concentration signal processing unit which are electrically connected with a detector (14) in the infrared receiving component, wherein the distance signal processing unit is used for working out the distance between a reflector (12) and the infrared receiving component, and the concentration signal processing unit is used for working out the gas concentration. The detector has the high precision for natural gas concentration detection, and can be widely applied to accurate positioning and detection of natural gas leakage.
Description
Technical field
The present invention relates to a kind of Laser stealth material device, the laser remote sensing of a kind of concentration of natural gas and distance is visited
Survey device.
Background technology
Along with the continuous expansion in natural gas consumption field, China has built the natural gas line of hundreds thousand of kilometers.For
So long gas distributing system, during the transport of natural gas, storage, sales management, leakage is inevitable, is also
Cause the main reason of security incident.Therefore, for finding that leakage point, people have developed natural gas leaking laser remote sensing in time
Detection Techniques.But, this technology is when detecting natural gas leaking, owing to the scattered light received is along with the difference of reflector, its
Light echo changed power is very big, and the second harmonic signal demodulated is proportional to light intensity, so that the accuracy of measurement result is beaten greatly
Discount.For solving this problem, people are made that unremitting effort, if Chinese invention patent CN 101696897B was in 2011 9
A kind of portable single-frequency difference gas pipeline leakage Laser stealth material system and method announced by the moon 7.This patent of invention
In the system mentioned mainly by methane gas survey meter, GPS geo-location system and CCD camera, and computer composition, its
In, methane gas survey meter comprises the laser instrument being connected with Cassegrain telescope light and is positioned at Cassegrain telescope focus
The control processing unit of the second photodetector electrical connection at place, controlling processing unit is that its input has been sequentially connected electrically modulus
Transducer and three lock-in amplifiers, outfans have been sequentially connected electrically digital to analog converter, sine wave module and feedback control direct current
Level block, adder and laser current temperature controller；Method is mainly modulated laser and is divided into two-beam in proportion, its
In light beam received by the first photodetector after the interior reference absorption cell rushing methane gas, and through the first lock-in amplifier
Being sent to microprocessor by analog-digital converter after demodulation, another light beam is after Cassegrain telescope coaxial transmitting, and it reflects light
After being converted to the signal of telecommunication by the second photodetector, through second and the 3rd lock-in amplifier demodulation after be sent to by analog-digital converter
Microprocessor, microprocessor the output signal of second, third lock-in amplifier collected being divided by obtains one and is proportional to
The ratio of concentration of methane gas, a certain corresponding to corresponding on the system calibrating curve that obtains with methane gas measurements of this ratio
Gas concentration.The ratio of this employing second harmonic signal and first harmonic signal residual amplitude eliminates the measure of light intensity impact,
Though some effects also can be obtained, owing to demodulation second harmonic signal and first harmonic signal use different phase-locked amplifications
Device, the information such as the phase place of two lock-in amplifiers is not consistent, and remote sensing distance in actual applications is change
, this has resulted in phase place and has also had certain change, and these all can cause and utilize second harmonic signal and first harmonic signal
The ratio of residual amplitude eliminates the impact of light intensity fluctuation and there is the biggest error.
Summary of the invention
In place of the technical problem to be solved in the present invention is for overcoming shortcoming of the prior art, it is provided that a kind of eliminate light intensity and away from
Concentration of natural gas measurement of concetration affected from change and the Laser stealth material device of distance.
For solving the technical problem of the present invention, the technical scheme used is: concentration of natural gas and the laser remote sensing of distance
Detection device includes Infrared laser emission and receives parts, and the control treatment part being connected electrically, particularly,
The transmitting signal that described control treatment part comprises electrical connection controls assembly and receives signal processing component；
It is three road signal generators, adder and the laser controller being sequentially connected in series that described transmitting signal controls assembly, uses
Low frequency sine wave signal, high_frequency sine wave signal and the sawtooth signal of the signal generator output of Yu Jiang tri-road obtain through adder
Control signal, the modulation laser instrument in Infrared laser emission parts exported to inject laser controller to realize；
Described reception signal processing component is that the distance signal electrically connected with the detector in infrared receiver parts processes list
Unit and concentration signal processing unit, wherein,
Distance signal processing unit is high pass filter, phase discriminator and data collection and analysis device, the Yi Jijian being sequentially connected in series
The high_frequency sine wave signal end electrical connection of the input Hai Yu tri-road signal generator of phase device, for by carry distance phase information
High-frequency signal carry out phase demodulation with high_frequency sine wave signal and compare, be sent to data collection and analysis device with the signal after comparing and calculate
Go out infrared receiver parts to the distance between reflector,
Concentration signal processing unit be low pass filter outfan respectively through lock-in amplifier and data collection and analysis device,
And directly electrically connect with data collection and analysis device, the input of lock-in amplifier therein is also through frequency multiplier circuit and three road signals
The low frequency sine wave signal end electrical connection of generator, for by containing the low-frequency sine after low frequency modulations absorption signal and frequency multiplication
Signal demodulates through lock-in amplifier, after second harmonic signal demodulation obtained by data collection and analysis device and elimination high frequency
Low-pass modulation absorption signal calculates gas concentration.
Further improvement as the Laser stealth material device of concentration of natural gas and distance:
Preferably, the outfan of data collection and analysis device is electrically connected with alarm.
Preferably, the band limits of low frequency sine wave signal is 10～50kHz, and the band limits of high_frequency sine wave signal is
200～2000kHz.
Preferably, Infrared laser emission parts are laser instrument, the optical fiber being sequentially connected with and are positioned in scattered light collecting lens
Optical fiber collimator at the heart.
Preferably, iraser receives parts is scattered light collecting lens and the spy being positioned at scattered light collecting lens focal point
Survey device.
Preferably, laser instrument is diode laser, or QCL, or OPO laser instrument.
Provide the benefit that relative to prior art:
After using such structure, both the non-absorbing section by extracting directly reflection scattered light light echo strength information was carried in
Low frequency sine wave signal amplitude on sawtooth waveforms, eliminates the light intensity change impact on it in measurement of concetration, has stopped again difference
The inconsistent error caused of the phase place of lock-in amplifier, also because measuring while concentration and distance, adequately in deduction air
The interference of absorption signal is laid a good foundation by background gas concentration, drastically increases the degree of accuracy of detection concentration of natural gas, from
And make to the composite can be widely applied to natural gas leaking is accurately positioned detection.
Accompanying drawing explanation
Fig. 1 is a kind of basic structure schematic diagram of the present invention.
Fig. 2 is the signal graph that the detector in Fig. 1 detects.
Fig. 3 is the second harmonic signal figure obtained after the lock-in amplifier in Fig. 1 demodulates.
Fig. 4 is the low-pass modulation absorption signal figure after the elimination high frequency of the low pass filter output in Fig. 1.
Detailed description of the invention
Below in conjunction with the accompanying drawings the optimal way of the present invention is described in further detail.
The composition of the Laser stealth material device seeing Fig. 1, concentration of natural gas and distance is as follows:
Device includes that the Infrared laser emission parts of electrical connection, iraser receive parts and control treatment part；Wherein,
Infrared laser emission parts are laser instrument 7, the optical fiber 8 being sequentially connected with and are positioned at scattered light collecting lens 10 center
Optical fiber collimator 9；Laser instrument 7 therein is diode laser (or QCL, or OPO laser instrument).
It is scattered light collecting lens 10 and the detection being positioned at scattered light collecting lens 10 focal point that iraser receives parts
Device 14.
The transmitting signal that control treatment part comprises electrical connection controls assembly and receives signal processing component；It is therein,
Launch signal controlling assembly is three road signal generators 0, adder 4 and the laser controller 6 being sequentially connected in series；Its
In, three road signal generators 0 export respectively 30 (can be 10～50) kHz low frequency sine wave signal 1,1100 (can be 200～
2000) the high_frequency sine wave signal 2 of kHz and sawtooth signal 3, for exporting the laser instrument 7 in Infrared laser emission parts
Modulation；
Receiving signal processing component is the distance signal processing unit electrically connected with the detector 14 in infrared receiver parts
With concentration signal processing unit, wherein,
Distance signal processing unit is high pass filter 15, phase discriminator 17 and the data collection and analysis device 25 being sequentially connected in series,
And the high_frequency sine wave signal 2 end electrical connection of the input Hai Yu tri-road signal generator 0 of phase discriminator 17, it is used for calculating red
Outer reception parts to the distance between reflector 12,
Concentration signal processing unit is that the outfan of low pass filter 19 divides with data acquisition through lock-in amplifier 21 respectively
Parser 25 and directly electrically connecting with data collection and analysis device 25, the input of lock-in amplifier 21 therein is also through frequency multiplication electricity
Road 22 electrically connects with low frequency sine wave signal 1 end of three road signal generators 0, is used for calculating gas concentration.
The outfan of data collection and analysis device 25 is electrically connected with alarm 26.
See Fig. 1, Fig. 2, Fig. 3 and Fig. 4, during detection, the low frequency sine wave signal 1 of three road signal generator 0 outputs, high frequency
Sine wave signal 2 and sawtooth signal 3, after adder 4, have been superimposed as control signal 5, and this control signal 5 injects laser controlling
After device 6, the output to laser instrument 7 is modulated.
When being loaded with the laser of modulation intelligence through optical fiber 8 and optical fiber collimator 9 during directive space to be measured, experience is let out
After gas leakage group 11 and reflector 12, its scattered light 13 is scattered that light collecting lens 10 converges at and is positioned at scattered light collecting lens 10 Jiao
On detector 14 at Dian, it be converted to the signal of telecommunication as shown in Figure 2, and respectively by high pass filter 15 and low pass filter
19 receive.
The signal of telecommunication that detector 14 exports is converted to the high-frequency signal 16 of carry distance phase information by high pass filter 15,
And after being sent to phase discriminator 17, carry out phase demodulation with high_frequency sine wave signal 2 and compare, obtain the signal after comparison 18；Afterwards, than
Signal 18 after relatively is sent to data collection and analysis device 25, by its calculate infrared receiver parts between reflector 12 away from
From.
The signal of telecommunication that detector 14 exports is respectively converted into containing low frequency modulations absorption signal 20 He by low pass filter 19
After the low-pass modulation absorption signal 23 after elimination high frequency as shown in Figure 4, it is sent to lock-in amplifier 21 respectively and data acquisition divides
Parser 25；Lock-in amplifier 21 is to containing low frequency modulations absorption signal 20 and the low-frequency sine letter after frequency multiplier circuit 22 frequency multiplication
Number it is demodulated, obtains second harmonic signal 24 as shown in Figure 3；Subsequently, data collection and analysis device 25 demodulation is obtained
Low-pass modulation absorption signal 23 after second harmonic signal 24 and elimination high frequency calculates gas concentration.
The detailed process calculating gas concentration is,
P in formula2fFor the difference between intensity peak and the baseline of second harmonic signal, PsinFor extracting non-absorbing
The low frequency sine wave signal that section is carried on sawtooth waveforms, SdcIt is the DC component of laser intensity information, k1、k2It is constant, α0It is gas
The absorptance of body molecule, C is gas concentration；Wherein,
K in formula is constant.
If gas concentration is higher than the value set, then triggers alarm 26 and send sound or light warning.
Obviously, those skilled in the art can be to the Laser stealth material device of the concentration of natural gas of the present invention and distance
Carry out various change and modification without departing from the spirit and scope of the present invention.So, if these of the present invention being revised and becoming
Type belongs within the scope of the claims in the present invention and equivalent technologies thereof, then the present invention is also intended to comprise these changes and modification exists
In.
Claims (6)
1. a Laser stealth material device for concentration of natural gas and distance, including Infrared laser emission and reception parts, and
The control treatment part being connected electrically, it is characterised in that:
The transmitting signal that described control treatment part comprises electrical connection controls assembly and receives signal processing component；
It is three road signal generators (0), adder (4) and the laser controller being sequentially connected in series that described transmitting signal controls assembly
(6), for low frequency sine wave signal (1), high_frequency sine wave signal (2) and sawtooth waveforms that three road signal generators (0) are exported
Signal (3) obtains control signal (5) through adder (4), to inject laser controller (6) realization in Infrared laser emission parts
The modulation that exports of laser instrument (7)；
Described reception signal processing component is that the distance signal electrically connected with the detector (14) in infrared receiver parts processes list
Unit and concentration signal processing unit, wherein,
Distance signal processing unit is high pass filter (15), phase discriminator (17) and the data collection and analysis device being sequentially connected in series
(25), and high_frequency sine wave signal (2) the end electrical connection on input Hai Yu tri-road signal generator (0) of phase discriminator (17),
Compare for the high-frequency signal of carry distance phase information (16) is carried out phase demodulation with high_frequency sine wave signal (2), comparing
After signal (18) be sent to data collection and analysis device (25) and calculate infrared receiver parts to the distance between reflector (12),
Concentration signal processing unit is that the outfan of low pass filter (19) divides with data acquisition through lock-in amplifier (21) respectively
Parser (25) and directly electrically connecting with data collection and analysis device (25), the input also warp of lock-in amplifier therein (21)
Frequency multiplier circuit (22) is held with the low frequency sine wave signal (1) of three road signal generators (0) and is electrically connected, and being used for will be containing low frequency modulations
Low frequency sine wave signal after absorption signal (20) and frequency multiplication demodulates through lock-in amplifier (21), with by data collection and analysis device
(25) the low-pass modulation absorption signal (23) after the second harmonic signal (24) demodulation obtained and elimination high frequency calculates gas
Concentration.
The Laser stealth material device of concentration of natural gas the most according to claim 1 and distance, is characterized in that data acquisition
The outfan of analyzer (25) is electrically connected with alarm (26).
The Laser stealth material device of concentration of natural gas the most according to claim 1 and distance, is characterized in that low frequency sinusoidal
The band limits of ripple signal (1) is 10～50kHz, and the band limits of high_frequency sine wave signal (2) is 200～2000kHz.
The Laser stealth material device of concentration of natural gas the most according to claim 1 and distance, is characterized in that iraser
Emission element is laser instrument (7), the optical fiber (8) being sequentially connected with and is positioned at the fiber optic collimator of scattered light collecting lens (10) center
Device (9).
The Laser stealth material device of concentration of natural gas the most according to claim 1 and distance, is characterized in that iraser
Receiving parts is scattered light collecting lens (10) and the detector (14) being positioned at scattered light collecting lens (10) focal point.
The Laser stealth material device of concentration of natural gas the most according to claim 1 and distance, is characterized in that laser instrument (7)
For diode laser, or QCL, or OPO laser instrument.
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| CN201610643098.1A CN106323878B (en) | 2016-08-08 | 2016-08-08 | The Laser stealth material device of concentration of natural gas and distance |
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| CN201610643098.1A CN106323878B (en) | 2016-08-08 | 2016-08-08 | The Laser stealth material device of concentration of natural gas and distance |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107178708A (en) * | 2017-06-28 | 2017-09-19 | 广东省特种设备检测研究院茂名检测院 | One kind is based on infrared ray oil and gas pipeline leakage detection device and detection method |
| CN107677575A (en) * | 2017-09-30 | 2018-02-09 | 合肥朗伯光电传感技术有限公司 | Single beam laser measures flue gas particles and the device and method of oxygen gas concentration |
| CN108037094A (en) * | 2017-11-30 | 2018-05-15 | 新疆美特智能安全工程股份有限公司 | A kind of fuel gas laser telemetry system and method |
| CN108918440A (en) * | 2018-05-30 | 2018-11-30 | 上海禾赛光电科技有限公司 | A kind of Laser stealth material system and method |
| CN109900656A (en) * | 2019-04-12 | 2019-06-18 | 西南石油大学 | One kind can pinpoint infrared methane measuring device and measuring method |
| CN113030015A (en) * | 2021-03-03 | 2021-06-25 | 合肥华领安防科技有限公司 | Hazardous gas laser remote sensing detection device and method for eliminating environmental interference |
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| CN109900656A (en) * | 2019-04-12 | 2019-06-18 | 西南石油大学 | One kind can pinpoint infrared methane measuring device and measuring method |
| CN113030015A (en) * | 2021-03-03 | 2021-06-25 | 合肥华领安防科技有限公司 | Hazardous gas laser remote sensing detection device and method for eliminating environmental interference |
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