CN107462900A - Gas componant detecting laser radar based on wavelength-tunable laser source - Google Patents
Gas componant detecting laser radar based on wavelength-tunable laser source Download PDFInfo
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- CN107462900A CN107462900A CN201710651695.3A CN201710651695A CN107462900A CN 107462900 A CN107462900 A CN 107462900A CN 201710651695 A CN201710651695 A CN 201710651695A CN 107462900 A CN107462900 A CN 107462900A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
- G01S17/88—Lidar systems specially adapted for specific applications
- G01S17/95—Lidar systems specially adapted for specific applications for meteorological use
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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
- G01N2021/1795—Atmospheric mapping of gases
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A90/00—Technologies having an indirect contribution to adaptation to climate change
- Y02A90/10—Information and communication technologies [ICT] supporting adaptation to climate change, e.g. for weather forecasting or climate simulation
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- Radar, Positioning & Navigation (AREA)
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- Investigating Or Analysing Materials By Optical Means (AREA)
- Optical Radar Systems And Details Thereof (AREA)
Abstract
The invention discloses a kind of gas componant detecting laser radar based on wavelength-tunable laser source, the Absorption Line for obtaining under test gas at different distance is scanned using Wavelength tunable laser, and using the frequency of femtosecond light comb Accurate Calibration shoot laser, Nonlinear Quasi is carried out by the Absorption Line of the under test gas to frequency demarcating and merges comparison database, so as to obtain the concentration information of under test gas.In order to measure the Absorption Line of under test gas, the present invention each provides the two schemes based on direct detection mode and coherent detection mode.According to the wavelength scanning range of optimization, the gas componant detecting laser radar based on wavelength-tunable laser source can realize multiple gases component detection, have the characteristics of high detection accuracy, High Range Resolution and high time resolution.
Description
Technical field
The present invention relates to laser remote sensing field, more particularly to a kind of gas componant detection based on wavelength-tunable laser source
Laser radar.
Background technology
Atmospheric gaseous components detection is significant for the meteorological change of research weather, development environmental protection.Particularly
With the high speed development of social economy, the discharge capacity of atmosphere pollution exceeds environmental bearing capacity.Laser stealth material due to
Its contactless detection, the features such as spatial and temporal resolution is high, detection range is remote, it is the effective means of atmospheric gaseous components detection.Its
Middle DIAL has realized air H2O, CO2, CO, HCI, NH3, NO2, SO2, O3Etc. the detection of gas componant, difference
The laser of two wavelength of absorption lidar generally use, the absorption cross-section of the laser of one of wavelength under test gas
By force, absorption cross-section of the laser of another wavelength under test gas is weak, by the ratio for detecting this two-way laser echo signal
Value, it may be determined that the composition of under test gas at different distance.
The specific gas that DIAL detects as needed select different optical maser wavelength, so as to realize difference
The detection of gas, it is the remote sensing technology that current Atmospheric components component detection generally uses.But it is there is also following several inferior positions,
(1) single set DIAL can only realize single types of gases component detection；(2) measurement needs accurate frequency locker
Fixed, measurement result stimulated light frequency drift influences big.
The content of the invention
It is an object of the invention to provide a kind of gas componant detecting laser radar based on wavelength-tunable laser source, and this swashs
Optical radar uses Wavelength tunable laser as light source, using coherent detection mode or direct detection mode exploring laser light thunder
Up to the echo-signal of reception, Accurate Calibration is carried out to the frequency for detecting light using femtosecond light comb (i.e. laser frequency demarcates part),
So as to obtain the density information for the various gas componants that Absorption Line in wavelength scanning range be present.
The purpose of the present invention is achieved through the following technical solutions：
A kind of gas componant detecting laser radar based on wavelength-tunable laser source, suitable for direct detection scheme, its
Including：Tunable wave length continuous wave laser (1), beam splitter (2), impulse generator (3), laser amplifier (4), Laser emission system
Unite (5), telescope (6), wave filter (7), detector (8), the first capture card (9), computer (10), femto-second laser (11),
3dB fiber optic splitters (12), balanced detector (13) and the second capture card (14)；Above-mentioned device composition probe portion and laser
Frequency demarcating part；Wherein：
The structure of probe portion is as follows：The output end of tunable wave length continuous wave laser (1) and the input of beam splitter (2)
Connection, a ends of beam splitter (2) are connected with the input of impulse generator (3), and the output end and laser of impulse generator (3) are put
The input connection of big device (4), output end and laser transmitting system (5) connection of laser amplifier (4)；The Laser emission system
Unite (5) by Laser emission into air after, the echo-signal of air is received by telescope (6), is returned by what telescope (6) received
The input of ripple signal access wave filter (7), the output end of wave filter (7) are connected with the input of detector (8), detector
(8) output end is connected with the input of the first capture card (9), and the output end of the first capture card (9) is defeated with computer (10)
Enter end connection；
The structure of laser frequency demarcation part is as follows：The output end and 3dB fiber optic splitters (12) of femto-second laser (11)
The connection of b ports, the b ends of beam splitter (2) connect with a ports of 3dB fiber optic splitters (12), 3dB fiber optic splitters (12)
Output end connects with the input of balanced detector (13), the output end of balanced detector (13) and the second capture card (14) it is defeated
Enter end connection, the output signal access computer (10) of the second capture card (14).
Realize that the process of Atmospheric components detection is as follows：
Step 1, the gas type detected as needed, determine wavelength scanning range；The tunable wave length continuous laser
Device (1) passes through controller adjusting wavelength scanning range；
Step 2, it is each scanning step on by pulse total specific wavelength Received Signal detect；
Step 3, regulation optical maser wavelength and repeat step 2, the atmospheric echo letter being measured in whole wavelength scanning range
Number, the Absorption Line of under test gas at acquisition different distance；
Step 4, the measurement by laser frequency demarcation part, it is determined that each outgoing frequency of the laser on scanning step；
Step 5, Nonlinear Quasi merging comparison database is carried out by the Absorption Line of the under test gas to frequency demarcating, so as to
Obtain the concentration information of the under test gas at different distance.
Carried out by the Absorption Line of the under test gas of Gauss, Voigt or galatry function pair frequency demarcating non-linear
Fitting.
A kind of gas componant detecting laser radar based on wavelength-tunable laser source, suitable for coherent detection scheme, its
Including：Tunable wave length continuous wave laser (1), the first beam splitter (2), the second beam splitter (3), impulse generator (4), laser are put
Big device (5), laser transmitting system (6), telescope (7), adjustable attenuator (8), the first 3dB beam splitters (9), the first balance detection
Device (10), the first capture card (11), computer (12), femto-second laser (13), 3dB fiber optic splitters (14), balanced detector
And the second capture card (16) (15)；Above-mentioned device composition probe portion and laser frequency demarcation part；Wherein：
The structure of probe portion is as follows：The output end of tunable wave length continuous wave laser (1) is defeated with the first beam splitter (2)
Enter end connection, a ends of the first beam splitter (2) connects with the input of the second beam splitter (3), the b ports of the second beam splitter (3) with
The input connection of impulse generator (4), the output end of impulse generator (4) are connected with the input of laser amplifier (5), swashed
Output end and laser transmitting system (6) connection of image intensifer (5), laser are transmitted into air by laser transmitting system (6),
The echo-signal of air is received by telescope (7), and the echo-signal received by telescope (7) accesses the first 3dB beam splitters (9)
A inputs, a ports of the second beam splitter (3) connect with the input of adjustable attenuator (8), the output of adjustable attenuator (8)
End connects with the b inputs of the first 3dB beam splitters (9), the output end and the first balanced detector of the first 3dB beam splitters (9)
(10) connect, the electric signal of the first balanced detector (10) output is gathered by the first capture card (11), gathers the signal of acquisition
Handled by computer (12)；
The structure of laser frequency demarcation part is as follows：The output end and the 2nd 3dB fiber optic splitters of femto-second laser (13)
(14) b ports connection, the b ends of the first beam splitter (2) connect with a ports of the 2nd 3dB fiber optic splitters (14), the 2nd 3dB
The output end of fiber optic splitter (14) connects with the input of the second balanced detector (15), the second balanced detector (15) it is defeated
Go out end to connect with the input of the second capture card (16), the output signal access computer (12) of the second capture card (16).
Realize that the process of Atmospheric components detection is as follows：
Step 1, the gas type detected as needed, determine wavelength scanning range；The tunable wave length continuous laser
Device (1) passes through controller adjusting wavelength scanning range；
Step 2, it is each scanning step on by pulse total specific wavelength Received Signal detect；
Step 3, regulation optical maser wavelength and repeat step 2, the atmospheric echo letter being measured in whole wavelength scanning range
Number, the Absorption Line of under test gas at acquisition different distance；
Step 4, the measurement by laser frequency demarcation part, it is determined that each outgoing frequency of the laser on scanning step；
Step 5, Nonlinear Quasi merging comparison database is carried out by the Absorption Line of the under test gas to frequency demarcating, so as to
Obtain the concentration information of the under test gas at different distance.
Carried out by the Absorption Line of the under test gas of Gauss, Voigt or galatry function pair frequency demarcating non-linear
Fitting.
As seen from the above technical solution provided by the invention, 1) by optimizing the wavelength of tunable wave length LASER Light Source
Scanning range, the concentration of multiple gases can be measured simultaneously.2) the outgoing wave progress by femtosecond light comb to tunable laser source
Row accurate measurement and tracking, the systematic error of the non-linear introducing of tunable laser source length scanning can be effectively avoided, is improved
Detection accuracy.
Brief description of the drawings
In order to illustrate the technical solution of the embodiments of the present invention more clearly, required use in being described below to embodiment
Accompanying drawing be briefly described, it should be apparent that, drawings in the following description are only some embodiments of the present invention, for this
For the those of ordinary skill in field, on the premise of not paying creative work, other can also be obtained according to these accompanying drawings
Accompanying drawing.
Fig. 1 is a kind of gas componant detecting laser radar based on wavelength-tunable laser source provided in an embodiment of the present invention
Structural representation；
Fig. 2 is another gas componant exploring laser light thunder based on wavelength-tunable laser source provided in an embodiment of the present invention
The structural representation reached；
Fig. 3 is the original of the gas componant detecting laser radar provided in an embodiment of the present invention based on wavelength-tunable laser source
Reason figure.
Embodiment
With reference to the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Ground describes, it is clear that described embodiment is only part of the embodiment of the present invention, rather than whole embodiments.Based on this
The embodiment of invention, the every other implementation that those of ordinary skill in the art are obtained under the premise of creative work is not made
Example, belongs to protection scope of the present invention.
Embodiment one
The embodiment of the present invention provides a kind of gas componant detecting laser radar based on wavelength-tunable laser source, and it is applicable
In direct detection scheme, as shown in figure 1, mainly including：Tunable wave length continuous wave laser 1, beam splitter 2, impulse generator 3,
Laser amplifier 4, laser transmitting system 5, telescope 6, wave filter 7, detector 8, the first capture card 9, computer 10, femtosecond swash
Light device 11,3dB fiber optic splitters 12, the capture card 14 of balanced detector 13 and second；Above-mentioned device composition probe portion is with swashing
Light frequency demarcates part；Wherein：
The structure of probe portion is as follows：The output end of tunable wave length continuous wave laser 1 connects with the input of beam splitter 2
Connect, a ends of beam splitter 2 connect with the input of impulse generator 3, the output end of impulse generator 3 and laser amplifier 4 it is defeated
Enter end connection, the output end and laser transmitting system 5 of laser amplifier 4 connect；The laser transmitting system 5 arrives Laser emission
After in air, the echo-signal of air is received by telescope 6, and the echo-signal received by telescope 6 accesses the defeated of wave filter 7
Enter end, the output end of wave filter 7 is connected with the input of detector 8, the output end of detector 8 and the input of the first capture card 9
End connection, the output end of the first capture card 9 are connected with the input of computer 10；
The structure of laser frequency demarcation part is as follows：The output end of femto-second laser 11 and the b ends of 3dB fiber optic splitters 12
Mouth connection, the b ends of beam splitter 2 connect with a ports of 3dB fiber optic splitters 12, the output end and balance of 3dB fiber optic splitters 12
The input connection of detector 13, the output end of balanced detector 13 connect with the input of the second capture card 14, the second collection
The output signal access computer 10 of card 14.
It will be understood by those skilled in the art that probe portion can share a computer with laser frequency demarcation part
10, drafting and representation for the ease of accompanying drawing, Fig. 1 depict a computer 10 respectively in this two parts.
In the embodiment of the present invention, laser transmitting system 5 can use bistatic structure with telescope 6, can also use and receive
Send out coaxial configuration.
In the embodiment of the present invention, detector 8 is preferably single-photon detector.
The above-mentioned gas componant detecting laser radar based on wavelength-tunable laser source provided in an embodiment of the present invention has
Following beneficial effect：
1) by optimizing the wavelength scanning range of tunable wave length LASER Light Source, the concentration of multiple gases can be measured simultaneously.
2) accurate measurement and tracking are carried out to the outgoing wave length of tunable laser source by femtosecond light comb, can effectively avoided
The systematic error of the non-linear introducing of tunable laser source length scanning, improves detection accuracy.
Embodiment two
The embodiment of the present invention provides a kind of gas componant detecting laser radar based on wavelength-tunable laser source, is applied to
Coherent detection scheme, as shown in Fig. 2 it mainly includes：Tunable wave length continuous wave laser 1, the first beam splitter 2, the second beam splitting
Device 3, impulse generator 4, laser amplifier 5, laser transmitting system 6, telescope 7, adjustable attenuator 8, the first 3dB beam splitters 9,
First balanced detector 10, the first capture card 11, computer 12, femto-second laser 13,3dB fiber optic splitters 14, balance detection
The capture card 16 of device 15 and second；Above-mentioned device composition probe portion and laser frequency demarcation part；Wherein：
The structure of probe portion is as follows：The output end of tunable wave length continuous wave laser 1 and the input of the first beam splitter 2
Connection, a ends of the first beam splitter 2 connect with the input of the second beam splitter 3, the b ports of the second beam splitter 3 and impulse generator
4 input connection, the output end of impulse generator 4 connect with the input of laser amplifier 5, the output of laser amplifier 5
End and laser transmitting system 6 are connected, and laser is transmitted into air by laser transmitting system 6, and the echo-signal of air passes through prestige
Remote mirror 7 receives, and the echo-signal received by telescope 7 accesses a inputs of the first 3dB beam splitters 9, a ends of the second beam splitter 3
Mouth connects with the input of adjustable attenuator 8, and the output end of adjustable attenuator 8 connects with the b inputs of the first 3dB beam splitters 9,
The output end of first 3dB beam splitters 9 and the first balanced detector 10 connect, and the electric signal of the first balanced detector 10 output passes through
First capture card 11 is gathered, and the signal for gathering acquisition is handled by computer 12；
The structure of laser frequency demarcation part is as follows：The output end of femto-second laser 13 and the 2nd 3dB fiber optic splitters 14
The connection of b ports, the b ends of the first beam splitter 2 connect with a ports of the 2nd 3dB fiber optic splitters 14, the 2nd 3dB fiber beam splittings
The output end of device 14 connects with the input of the second balanced detector 15, the output end of the second balanced detector 15 and the second collection
The input connection of card 16, the output signal access computer 12 of the second capture card 16.
It will be understood by those skilled in the art that probe portion can share a computer with laser frequency demarcation part
12, drafting and representation for the ease of accompanying drawing, Fig. 1 depict a computer 12 respectively in this two parts.
In the embodiment of the present invention, laser transmitting system 6 can use bistatic structure with telescope 7, can also use and receive
Send out coaxial configuration.
The above-mentioned gas componant detecting laser radar based on wavelength-tunable laser source provided in an embodiment of the present invention has
Following beneficial effect：
1) by optimizing the wavelength scanning range of tunable wave length LASER Light Source, the concentration of multiple gases can be measured simultaneously.
2) accurate measurement and tracking are carried out to the outgoing wave length of tunable laser source by femtosecond light comb, can effectively avoided
The systematic error of the non-linear introducing of tunable laser source length scanning, improves detection accuracy.
The gas componant exploring laser light thunder based on wavelength-tunable laser source that above-mentioned two embodiment of the present invention is proposed
The principle reached is identical, refers to Fig. 3.Circle in Fig. 3 (a) represents the gaseous absorption line of lidar measurement at distance R, solid line
The result of the gaseous absorption line progress nonlinear fitting acquisition to measurement is represented, passes through comparison database and obtains the dense of gas with various
Spend information.In order to determine the wavelength during tunable laser length scanning, as shown in Fig. 3 (b), by femtosecond light comb (i.e.
Laser frequency demarcates part) frequency-tracking is carried out to each shoot laser.In detection process, the tunable wave length continuously swashs
For light device 1 by controller adjusting wavelength scanning range, it realizes that the process of Atmospheric components detection is as follows：Step 1, visit as needed
The gas type of survey, determines wavelength scanning range；The tunable wave length continuous wave laser 1 is scanned by controller adjusting wavelength
Scope；Step 2, it is each scanning step on by pulse total specific wavelength Received Signal detect；Step 3,
Optical maser wavelength and repeat step 2 are adjusted, the Received Signal being measured in whole wavelength scanning range, obtains different distance
Locate the Absorption Line of under test gas；Step 4, the measurement by laser frequency demarcation part, it is determined that each laser on scanning step
Outgoing frequency；Step 5, Nonlinear Quasi merging comparison database is carried out by the Absorption Line of the under test gas to frequency demarcating,
So as to obtain the concentration information of the under test gas at different distance.Exemplary, Gauss, Voigt or galatry can be passed through
The Absorption Line of the under test gas of function pair frequency demarcating carries out nonlinear fitting.
The foregoing is only a preferred embodiment of the present invention, but protection scope of the present invention be not limited thereto,
Any one skilled in the art is in the technical scope of present disclosure, the change or replacement that can readily occur in,
It should all be included within the scope of the present invention.Therefore, protection scope of the present invention should be with the protection model of claims
Enclose and be defined.
Claims (6)
1. a kind of gas componant detecting laser radar based on wavelength-tunable laser source, it is characterised in that suitable for directly visiting
Survey scheme, it includes：Tunable wave length continuous wave laser (1), beam splitter (2), impulse generator (3), laser amplifier (4),
Laser transmitting system (5), telescope (6), wave filter (7), detector (8), the first capture card (9), computer (10), femtosecond swash
Light device (11), 3dB fiber optic splitters (12), balanced detector (13) and the second capture card (14)；Above-mentioned device composition detection
Part is demarcated in part with laser frequency；Wherein：
The structure of probe portion is as follows：The output end of tunable wave length continuous wave laser (1) connects with the input of beam splitter (2)
Connect, a ends of beam splitter (2) connect with the input of impulse generator (3), the output end and laser amplifier of impulse generator (3)
The input connection of device (4), output end and laser transmitting system (5) connection of laser amplifier (4)；The laser transmitting system
(5) by Laser emission into air after, the echo-signal of air is received by telescope (6), the echo received by telescope (6)
The input of signal access wave filter (7), the output end of wave filter (7) are connected with the input of detector (8), detector (8)
Output end be connected with the input of the first capture card (9), the output end of the first capture card (9) and the input of computer (10)
Connection；
The structure of laser frequency demarcation part is as follows：The output end of femto-second laser (11) and the b ends of 3dB fiber optic splitters (12)
Mouth connection, the b ends of beam splitter (2) connect with a ports of 3dB fiber optic splitters (12), the output end of 3dB fiber optic splitters (12)
Connected with the input of balanced detector (13), the output end of balanced detector (13) and the input of the second capture card (14) connect
Connect, the output signal access computer (10) of the second capture card (14).
2. a kind of gas componant detecting laser radar based on wavelength-tunable laser source according to claim 1, it is special
Sign is, realizes that the process of Atmospheric components detection is as follows：
Step 1, the gas type detected as needed, determine wavelength scanning range；The tunable wave length continuous wave laser (1)
Pass through controller adjusting wavelength scanning range；
Step 2, it is each scanning step on by pulse total specific wavelength Received Signal detect；
Step 3, regulation optical maser wavelength and repeat step 2, the Received Signal being measured in whole wavelength scanning range, are obtained
Obtain the Absorption Line of under test gas at different distance；
Step 4, the measurement by laser frequency demarcation part, it is determined that each outgoing frequency of the laser on scanning step；
Step 5, Nonlinear Quasi merging comparison database is carried out by the Absorption Line of the under test gas to frequency demarcating, so as to obtain
The concentration information of under test gas at different distance.
3. a kind of gas componant detecting laser radar based on wavelength-tunable laser source according to claim 2, it is special
Sign is, Nonlinear Quasi is carried out by the Absorption Line of the under test gas of Gauss, Voigt or galatry function pair frequency demarcating
Close.
4. a kind of gas componant detecting laser radar based on wavelength-tunable laser source, it is characterised in that visited suitable for relevant
Survey scheme, it includes：Tunable wave length continuous wave laser (1), the first beam splitter (2), the second beam splitter (3), impulse generator
(4), laser amplifier (5), laser transmitting system (6), telescope (7), adjustable attenuator (8), the first 3dB beam splitters (9),
One balanced detector (10), the first capture card (11), computer (12), femto-second laser (13), 3dB fiber optic splitters (14),
Balanced detector (15) and the second capture card (16)；Above-mentioned device composition probe portion and laser frequency demarcation part；Wherein：
The structure of probe portion is as follows：The output end of tunable wave length continuous wave laser (1) and the input of the first beam splitter (2)
Connection, a ends of the first beam splitter (2) connect with the input of the second beam splitter (3), the b ports of the second beam splitter (3) and pulse
The input connection of generator (4), the output end of impulse generator (4) are connected with the input of laser amplifier (5), and laser is put
The output end and laser transmitting system (6) connection, laser of big device (5) are transmitted into air by laser transmitting system (6), air
Echo-signal by telescope (7) receive, by telescope (7) receive echo-signal access the first 3dB beam splitters (9) a
Input, a ports of the second beam splitter (3) connect with the input of adjustable attenuator (8), the output end of adjustable attenuator (8)
Connected with the b inputs of the first 3dB beam splitters (9), the output end and the first balanced detector (10) of the first 3dB beam splitters (9)
Connection, the electric signal of the first balanced detector (10) output are gathered by the first capture card (11), and the signal for gathering acquisition passes through
Computer (12) processing；
The structure of laser frequency demarcation part is as follows：The output end of femto-second laser (13) and the 2nd 3dB fiber optic splitters (14)
The connection of b ports, the b ends of the first beam splitter (2) connect with a ports of the 2nd 3dB fiber optic splitters (14), the 2nd 3dB optical fiber
The output end of beam splitter (14) connects with the input of the second balanced detector (15), the output end of the second balanced detector (15)
Connected with the input of the second capture card (16), the output signal access computer (12) of the second capture card (16).
5. a kind of gas componant detecting laser radar based on wavelength-tunable laser source according to claim 4, it is special
Sign is, realizes that the process of Atmospheric components detection is as follows：
Step 1, the gas type detected as needed, determine wavelength scanning range；The tunable wave length continuous wave laser (1)
Pass through controller adjusting wavelength scanning range；
Step 2, it is each scanning step on by pulse total specific wavelength Received Signal detect；
Step 3, regulation optical maser wavelength and repeat step 2, the Received Signal being measured in whole wavelength scanning range, are obtained
Obtain the Absorption Line of under test gas at different distance；
Step 4, the measurement by laser frequency demarcation part, it is determined that each outgoing frequency of the laser on scanning step；
Step 5, Nonlinear Quasi merging comparison database is carried out by the Absorption Line of the under test gas to frequency demarcating, so as to obtain
The concentration information of under test gas at different distance.
6. a kind of gas componant detecting laser radar based on wavelength-tunable laser source according to claim 5, it is special
Sign is, Nonlinear Quasi is carried out by the Absorption Line of the under test gas of Gauss, Voigt or galatry function pair frequency demarcating
Close.
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110031427A (en) * | 2019-05-24 | 2019-07-19 | 中国科学技术大学 | A kind of scanning detection method and laser radar of environmental gas |
| WO2020019153A1 (en) * | 2018-07-24 | 2020-01-30 | 中国科学技术大学 | Femtosecond laser radar and gas composition detection method |
| CN110749873A (en) * | 2018-07-24 | 2020-02-04 | 中国科学技术大学 | Femtosecond laser radar and gas component detection method |
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| WO2020019153A1 (en) * | 2018-07-24 | 2020-01-30 | 中国科学技术大学 | Femtosecond laser radar and gas composition detection method |
| CN110749873A (en) * | 2018-07-24 | 2020-02-04 | 中国科学技术大学 | Femtosecond laser radar and gas component detection method |
| CN110031427A (en) * | 2019-05-24 | 2019-07-19 | 中国科学技术大学 | A kind of scanning detection method and laser radar of environmental gas |
| CN112180392B (en) * | 2019-07-02 | 2024-05-17 | 中国科学技术大学 | Atmospheric component detection laser radar based on dispersion gating |
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