CN103592652B - Bifrequency Doppler laser radar detection system based on single four marginal technology of solid FP etalons - Google Patents
Bifrequency Doppler laser radar detection system based on single four marginal technology of solid FP etalons Download PDFInfo
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- CN103592652B CN103592652B CN201310542632.6A CN201310542632A CN103592652B CN 103592652 B CN103592652 B CN 103592652B CN 201310542632 A CN201310542632 A CN 201310542632A CN 103592652 B CN103592652 B CN 103592652B
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- fiber coupler
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Classifications
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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
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P13/00—Indicating or recording presence, absence, or direction, of movement
- G01P13/02—Indicating direction only, e.g. by weather vane
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P5/00—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft
- G01P5/26—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft by measuring the direct influence of the streaming fluid on the properties of a detecting optical wave
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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
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
- G01S7/481—Constructional features, e.g. arrangements of optical elements
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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
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
- G01S7/481—Constructional features, e.g. arrangements of optical elements
- G01S7/4814—Constructional features, e.g. arrangements of optical elements of transmitters alone
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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
Abstract
The present invention relates to a kind of Doppler laser radar detection system, more particularly to a kind of bifrequency Doppler laser radar detection system based on single four marginal technology of solid FP etalons.It is characterized in that：Atmospheric backscatter signal is collected via Cassegrain telescope, after the 4th convex lenss, narrow band pass filter, one end of the long bare fibre wire jumpers of 200m is coupled into, a branch end of the other end and the 21 × 2nd fiber coupler of the long bare fibre wire jumpers of 200m is connected.The conjunction Shu Duan of the 21 × 2nd fiber coupler is connected with a ends of Optical circulator, the reflected beams of beam splitter are coupled into a branch end of the one 1 × 2nd fiber coupler, and the conjunction Shu Duan of the one 1 × 2nd fiber coupler and another branch end are connected with the long bare fibres of 100m, the 21 × 2nd fiber coupler another branch end respectively.Due to adopting above-mentioned technical proposal, advantage for present invention and good effect to be：Both signal to noise ratio had been improve, the discriminability of reflected signal had been made full use of again, discrimination sensitivity had been improved, so as to improve the measuring wind speed precision of system.
Description
Technical field
The present invention relates to a kind of Doppler laser radar detection system, more particularly to a kind of to be based on list solid FP etalons four
The bifrequency Doppler laser radar detection system of marginal technology.
Background technology
From the beginning of last century the eighties, Direct-detection Doppler lidar technology has obtained swift and violent development, successively
Occur in that two kinds of Doppler frequency detection techniques：Marginal technology and fringe technique.Marginal technology is interfered based on FP at first
Instrument single edges technology.1998, Korb et al. developed the two-sided matching based on FP interferometers.Except being made using FP interferometers
Outside for descriminator, the method that frequency discrimination is carried out using iodine spectra was there have been developed later.D was proposed and was adopted calendar year 2001 Bruneau
With Mach-Zehnder interferometers as marginal technology descriminator.The FP interferometers that fringe technique is adopted at first are used as mirror
Frequency device.Due to the generation of FP interferometers is circular fringes, is made troubles to direct detection.2002, J A Mckay were analyzed and are adopted
With Fizeau interferometers as descriminator detection performance, the same year Bruneau, D was proposed using Mach-Zehnder interferometers
As the descriminator of fringe technique.Comparatively speaking, it is presently the most based on the two-sided matching of FP interferometers and is generally adopted
Technology.But by carefully analyzing discovery, the technology only make use of the discriminability of FP interferometer transmission signals, without profit
With the discriminability of reflected signal.So no matter from detection signal to noise ratio angle, or from the point of view of system discrimination sensitivity, all may
The spectral characteristic of FP interferometers is not fully excavated.
The content of the invention
The technical problem to be solved is：A kind of double frequency based on single four marginal technology of solid FP etalons is provided
Rate Doppler laser radar detection system, can be with the bifrequency Doppler lidar based on single four marginal technology of FP etalons
Measurement wind speed.
The technical solution adopted for the present invention to solve the technical problems is：The present invention measuring wind speed principle as shown in figure 1,
Before and after any one-level transmission spectrum and reflectance spectrum of FP etalons, two waists intersect respectively, form four edges.To make full use of this
Four edges, launch laser frequency v0i(i=1,2) in two near intersections alternate changes, so as to form " four edge of bifrequency "
Detection Techniques.Transmitting laser light incident runs into particulate or atmospheric molecule (the i.e. wind for having macroscopic motion speed in air
Speed), due to the Doppler effect of light, compared with transmitting laser, frequency v of rear orientation lighti(2) i=1 there will be and laser
Direction of the launch wind speed component (i.e. radial direction wind speed) VrCorresponding Doppler frequency shift amount vd=vi-v0i=2Vr/ λ, wherein λ are transmitting
Optical maser wavelength.So, back scattering optical signal will occur respective change through the transmitance and reflectance of FP etalons.According to saturating
The variable quantity of rate and reflectance is crossed, Doppler's frequency shift amount can be calculated to obtain according to previously known transmission spectrum and reflectance spectrum, and then obtained
To the size and Orientation of radial direction wind speed.
Frequency is the transmitance and reflectance difference that the monochromatic collimated beam of v incides preferable Fabry-Perot etalons
For：
Wherein θ is angle of incidence；vFSR=c/2nd freely composes spacing for etalon, and intervals of the d for flat board, n are the refraction between plate
Rate, c are the light velocity in vacuum；Δv1/2For etalon bandwidth.
However, the optical signal for being actually incident on FP etalons is by fiber coupling, and obtain after colimated light system, therefore not
It is strict directional light；Meanwhile, either launch laser, or backscatter signal light is not strict monochromatic light.Additionally,
Actual FP etalons have absorption and scattering etc. to incident optical signal to be affected；Two planar surfaces of actual standard tool are not strictly put down
It is whole, there is certain defect；Two flat boards are also impossible to accomplish perfect parallelism there is certain nonparallelism.Hypothesis incides reality
The full angle of divergence of optical signal of border FP etalons is 2 θ0, frequency spectrum be Gauss distribution (because launch laser line, rice back scattering spectrum and
Gauss distribution is approximately on Rayleigh beacon spectral theory all) and uniform intensity, Jing deriving the optical signal after FP etalons
Transmitance and reflectance be respectively
Wherein
Absorbances of the A for planar surface metal film in formula；Reflectance of the R for corresponding wavelength etalon flat board；Tav=(1-R-
A)2/ (1-R2) for the mean transmissivity of etalon；ΩFP=2π(1-cosθ0) for incident beam solid angle；V is incident light center frequency
Rate；For equivalent incident laser 1/e height spectrum widths, wherein Δ dDFor standard
The tool flat-panel defect factor；α is two interference flat board angles；ρ is circular aperture etalon flat board radius；Δ v is Gauss incident light spectrum
The width that 1/e highly locates.For transmitting laser itself or rice backscatter signal, Δ v=Δ vl=δ v/ (4ln2)1/2, δ v are sharp
Light emission spectrum width (FWHM)；For Rayleigh beacon signal,Wherein Δ vr=(8kT/M λ2)1/2, T
For atmospheric temperature；λ is optical maser wavelength；K is Boltzmann constant；M atmospheric molecule quality.
Define Doppler frequency receptance function Q (vd) be
WhereinThen radial direction wind speed is
Radial direction measuring wind speed error is obtained using formula of error transmission is：
In formula：θVDoppler frequency receptance function velocity sensitivity；SNR is the total signal to noise ratio of system detectable signal.It is assumed that
Reference signal is very strong, and the negligible effect of noise of measurement to launching laser frequency, analysis obtain θVCan be expressed as with SNR
In formula：Mi=M(v0i+vd)；Iti=It(v0i+vd)；Iri=Ir(v0i+vd), i=1,2.ItiAnd Iri
Respectively frequency is viBack scattering optical signal incide the transmission signal after etalon and reflected signal.
The structure of the present invention is by emission system, reception system, transmitting four subsystems such as receiving optics and control system
System composition.The small-sized narrow linewidth of frequency stabilization of MOPA structures is constituted using external cavity semiconductor laser and tubaeform diode amplifier
Tunable semiconductor laser system is used for lower atmosphere layer Wind measurement as emission source, the laser for launching 852nm high repetition frequencies.
Acousto-optic frequency shifters are inserted between seed light and amplifier, after often accumulating certain umber of pulse, Laser emission program is by control
The driving of acousto-optic frequency shifters makes the pulse laser frequency of outgoing in v01、v02Between alternate.Transmitting laser is through the second light
After isolator, then two beams are divided into by beam splitter.The reflected light for occupying little energy enters the one 1 × 2nd optical fiber as reference light
One Zhi Duan of bonder, after the long bare fibre of one section of about 100m, its rear orientation light is by another port output of homonymy
And enter an input Zhi Duan of the 21 × 2nd fiber coupler.The transmitted light for occupying most energy is compressed through beam expanding lens
After beam divergence angle, pass sequentially through first, second, and third 45 degree of reflecting mirrors, two reflecting mirrors of two-dimensional scanner, finally with
Default azimuth is vertical with zenith angle to enter air tested region through glass plate.Its atmospheric backscatter light is by telescope
Receive, sequentially pass through the narrow band pass filter that centre wavelength is 852nm filter and the long bare fibre wire jumper time delay of one section of 200m after, enter
Another input Zhi Duan of the 21 × 2nd fiber coupler.Optical signal from the output of the 21 × 2nd fiber coupler is through optical loop
A → b paths of device, after being collimated by collimating mirror, normal incidence is to solid FP etalons.Its optical signal transmissive is converged using the 5th convex lenss
Received by the first avalanche photodide after poly-；And reflected light signal incides Optical circulator after assembling reverses through collimating mirror
B ports, through b → c paths of Optical circulator, are directly received by the second avalanche photodide.Two avalanche photodides
The output signal of detector is first gathered by double channels acquisition card, then by industrial computer carry out data processing, storage, wind speed retrieval and
As a result show etc..The laser instrument of whole system, acousto-optic frequency shifters, two-dimensional scanner, double channels acquisition card etc. are connect by RS232
Mouth is by computer controls.The present invention by external cavity semiconductor laser, the first convex lenss, acousto-optic frequency shifters, the first optoisolator,
Second convex lenss, the 3rd convex lenss, tubaeform diode amplifier, the second optoisolator, beam splitter, beam expanding lens, the one 45 degree
Reflecting mirror, the 2nd 45 degree of reflecting mirror, the 3rd 45 degree of reflecting mirror, two-dimensional scanner, glass plate, Cassegrain telescope, the 4th
Convex lenss, narrow band pass filter, the one 1 × 2nd fiber coupler, the long bare fibres of 100m, the long bare fibre wire jumpers of 200m, the 21 × 2nd light
Fine bonder, Optical circulator, collimating mirror, solid FP etalons, temperature controller, the 5th convex lenss, optical patchcord, the first snowslide
Photodiode, the second avalanche photodide, amplifier driving power supply, industrial computer, acousto-optic frequency shifters driving, triggers circuit,
Double channels acquisition card, laser driven power supply and two-dimensional scanner controller composition, is characterized in that：External cavity semiconductor laser point
It is not connected with triggers circuit, laser driven power supply, the first convex lens of Jing after the seed laser elder generation that external cavity semiconductor laser sends
Mirror, acousto-optic frequency shifters, the first optoisolator, the second convex lenss, the 3rd convex lenss, tubaeform diode amplifier, the second light every
Two beams are divided into by beam splitter after device, after transmitted light beam is expanded by beam expanding lens, the one 45 degree of reflecting mirror of Jing, the 2nd 45 degree of reflection
After the 3rd 45 degree of reflecting mirror in mirror and Cassegrain telescope, along the optical axis direction directive two-dimensional scan of Cassegrain telescope
In instrument, after two-dimensional scanner leaded light, vertically Atmospheric Survey region is entered through glass plate；First piece of two-dimensional scanner
Reflecting mirror is in 45 with second piece of reflecting mirror of the optical axis in 45 degree of angles, glass plate and two-dimensional scanner of Cassegrain telescope
Degree angle, two-dimensional scanner are connected with two-dimensional scanner controller by data control line, and atmospheric backscatter signal is via card
Plug Green telescope is collected, and after the 4th convex lenss, narrow band pass filter, is being coupled into the one of the long bare fibre wire jumpers of 200m
End, a branch end of the other end and the 21 × 2nd fiber coupler of the long bare fibre wire jumpers of 200m are connected, the 21 × 2nd optical fiber
The conjunction Shu Duan of bonder is connected with a ends of Optical circulator, and the reflected beams of beam splitter are coupled into the one 1 × 2nd fiber coupler
A branch end, the conjunction Shu Duan of the one 1 × 2nd fiber coupler and another branch end respectively with the long bare fibres of 100m, the 2nd 1
× 2 fiber couplers another branch ends is connected, the b ends of Optical circulator and collimating mirror, solid FP etalons, the 5th convex lenss,
One end of optical patchcord is communicated in light path, and the other end of optical patchcord and the first avalanche photodide are connected, Optical circulator b ends
Go out luminous point in the object focus of collimating mirror, the c ends optical fiber and the second avalanche photodide of Optical circulator are connected, temperature control
Device processed is connected with solid FP etalons, and the first avalanche photodide, the second avalanche photodide are respectively and double channels acquisition
Card is connected, and double channels acquisition card is connected with triggers circuit, amplifier driving power supply, acousto-optic frequency shifters driving, triggers circuit, seed
Laser driven power supply, two-dimensional scanner controller are connected with industrial computer, are uniformly controlled by industrial computer, amplifier driving power supply and loudspeaker
Shape diode amplifier is connected, and acousto-optic frequency shifters drive and are connected with acousto-optic frequency shifters.
Due to adopting above-mentioned technical proposal, advantage for present invention and good effect to be：It is dry based on FP with existing
The Doppler lidar system of the two-sided matching of interferometer is compared, and has both improved signal to noise ratio, makes full use of the mirror of reflected signal again
Frequency ability, improves discrimination sensitivity, so as to improve the measuring wind speed precision of system.
Description of the drawings
Fig. 1 is the measuring principle figure of the present invention.
Fig. 2 is the structure chart of the present invention.
1. external cavity semiconductor laser in figure, 2. the first convex lenss, 3. acousto-optic frequency shifters, the 4, first optoisolator, 5.
Second convex lenss, 6. the 3rd convex lenss, 7. tubaeform diode amplifier, 8. the second optoisolator, 9. beam splitter, 10. expands
Mirror, 11. the 1st degree of reflecting mirrors, 12. the 2nd 45 degree of reflecting mirrors, 13. the 3rd 45 degree of reflecting mirrors, 14. two-dimensional scanners, 15. glass
Glass flat board, 16. Cassegrain telescopes, 17. the 4th convex lenss, 18. narrow band pass filters, 19. the one 1 × 2nd fiber couplers,
The long bare fibres of 20.100m, the long bare fibre wire jumpers of 21.200m, 22. the 21 × 2nd fiber couplers, 23. Optical circulators, 24. collimations
Mirror, 25. solid FP etalons, 26. temperature controllers, 27. the 5th convex lenss, 28. optical patchcords, 29. first avalanche optoelectronics two
Pole pipe, 30. second avalanche photodides, 31. amplifier driving power supplies, 32. industrial computers, 33. acousto-optic frequency shifters drive, and 34.
Triggers circuit, 35. double channels acquisition cards, 36. laser driven power supplies, 37. two-dimensional scanner controllers.
Specific embodiment
In fig. 2, external cavity semiconductor laser (1) is connected with triggers circuit (34), laser driven power supply (36) respectively,
After the seed laser elder generation that external cavity semiconductor laser (1) sends the first convex lenss of Jing (2), acousto-optic frequency shifters (3), the first light every
After device (4), the second convex lenss (5), the 3rd convex lenss (6), tubaeform diode amplifier (7), the second optoisolator (8) by
Beam splitter (9) is divided into two beams, after transmitted light beam is expanded by beam expanding lens (10), the one 45 degree of reflecting mirror (11) of Jing, the 2nd 45 degree
After the 3rd 45 degree of reflecting mirror (13) in reflecting mirror (12) and Cassegrain telescope (16), along Cassegrain telescope (16)
In optical axis direction directive two-dimensional scanner (14), after two-dimensional scanner (14) leaded light, vertically enter through glass plate (15)
Enter Atmospheric Survey region, first piece of reflecting mirror of two-dimensional scanner (14) is pressed from both sides in 45 degree with the optical axis of Cassegrain telescope (16)
Second piece of reflecting mirror of angle, glass plate (15) and two-dimensional scanner (14) is in 45 degree of angles, and two-dimensional scanner (14) is by number
It is connected with two-dimensional scanner controller (37) according to control line, atmospheric backscatter signal is received via Cassegrain telescope (16)
Collection, in the one end for after the 4th convex lenss (17), narrow band pass filter (18), being coupled into the long bare fibre wire jumpers (21) of 200m,
One branch end of the other end and the 21 × 2nd fiber coupler (22) of the long bare fibre wire jumpers (21) of 200m is connected, and the 21 × 2nd
The conjunction Shu Duan of fiber coupler (22) is connected with a ends of Optical circulator (23), and the reflected beams of beam splitter (9) are coupled into first
One branch end of 1 × 2 fiber coupler (19), conjunction Shu Duan and another branch end point of the one 1 × 2nd fiber coupler (19)
It is not connected with the long bare fibres of 100m (20), the 21 × 2nd fiber coupler (22) another branch end, the b ends of Optical circulator (23)
Communicate in light path with one end of collimating mirror (24), solid FP etalons (25), the 5th convex lenss (27), optical patchcord (28), light
The other end and the first avalanche photodide (29) of fine wire jumper (28) is connected, and Optical circulator (23) b brings out luminous point in collimating mirror
(24), in object focus, the c ends optical fiber and the second avalanche photodide (30) of Optical circulator (23) are connected, temperature control
Device (26) is connected with solid FP etalons (25), the first avalanche photodide (29), the second avalanche photodide (30) point
It is not connected with double channels acquisition card (35), double channels acquisition card (35) is connected with triggers circuit (34), amplifier driving power supply
(31), acousto-optic frequency shifters drive (33), triggers circuit (34), seed laser driving power supply (36), two-dimensional scanner controller
(37) it is connected with industrial computer (32), is uniformly controlled by industrial computer (32), amplifier driving power supply (31) and tubaeform diode is put
Big device (7) is connected, and acousto-optic frequency shifters drive (33) to be connected with acousto-optic frequency shifters (3).
Claims (1)
1. a kind of bifrequency Doppler laser radar detection system based on single four marginal technology of solid FP etalons, by external cavity type
It is semiconductor laser, the first convex lenss, acousto-optic frequency shifters, the first optoisolator, the second convex lenss, the 3rd convex lenss, tubaeform
Diode amplifier, the second optoisolator, beam splitter, beam expanding lens, the one 45 degree of reflecting mirror, the 2nd 45 degree of reflecting mirror, the 3rd 45
Degree reflecting mirror, two-dimensional scanner, glass plate, Cassegrain telescope, the 4th convex lenss, narrow band pass filter, the one 1 × 2nd light
It is the long bare fibre wire jumper of the long bare fibre of fine bonder, 100m, 200m, the 21 × 2nd fiber coupler, Optical circulator, collimating mirror, solid
Body FP etalons, temperature controller, the 5th convex lenss, optical patchcord, the first avalanche photodide, two pole of the second avalanche optoelectronic
Pipe, amplifier driving power supply, industrial computer, acousto-optic frequency shifters driving, triggers circuit, double channels acquisition card, laser driven power supply and
Two-dimensional scanner controller is constituted, and be it is characterized in that：External cavity semiconductor laser (1) is driven with triggers circuit (34), laser respectively
Galvanic electricity source (36) is connected, the first convex lenss of Jing (2), acousto-optic frequency after the seed laser elder generation that external cavity semiconductor laser (1) sends
Move device (3), the first optoisolator (4), the second convex lenss (5), the 3rd convex lenss (6), tubaeform diode amplifier (7), the
Two beams are divided into by beam splitter (9) after two optoisolators (8), after transmitted light beam is expanded by beam expanding lens (10), the one 45 degree of Jing is anti-
After the 3rd 45 degree of reflecting mirror (13) penetrated in mirror (11), the 2nd 45 degree of reflecting mirror (12) and Cassegrain telescope (16), along card
In optical axis direction directive two-dimensional scanner (14) of plug Green's telescope (16), after two-dimensional scanner (14) leaded light, vertically
Through glass plate (15) into Atmospheric Survey region, first piece of reflecting mirror of two-dimensional scanner (14) and Cassegrain telescope
(16) second piece reflecting mirror of the optical axis in 45 degree angles, glass plate (15) and two-dimensional scanner (14) in 45 degree of angles, two
Dimension scanner (14) is connected with two-dimensional scanner controller (37) by data control line, and atmospheric backscatter signal is via jam
Green's telescope (16) is collected, and after the 4th convex lenss (17), narrow band pass filter (18), is coupled into the long bare fibres of 200m
One end of wire jumper (21), a branch road of the other end and the 21 × 2nd fiber coupler (22) of the long bare fibre wire jumpers (21) of 200m
End is connected, and the conjunction Shu Duan of the 21 × 2nd fiber coupler (22) is connected with a ends of Optical circulator (23), the reflection of beam splitter (9)
Light beam coupling enters a branch end of the one 1 × 2nd fiber coupler (19), the conjunction Shu Duan of the one 1 × 2nd fiber coupler (19)
It is connected with the long bare fibres of 100m (20), the 21 × 2nd fiber coupler (22) another branch end with another branch end respectively,
The b ends of Optical circulator (23) and collimating mirror (24), solid FP etalons (25), the 5th convex lenss (27), optical patchcord (28)
One end is communicated in light path, and the other end and the first avalanche photodide (29) of optical patchcord (28) are connected, Optical circulator (23) b
Luminous point is brought out in the object focus of collimating mirror (24), the c ends optical fiber and the second avalanche photodide of Optical circulator (23)
(30) it is connected, temperature controller (26) is connected with solid FP etalons (25), the first avalanche photodide (29), the second snowslide
Photodiode (30) is connected with double channels acquisition card (35) respectively, and double channels acquisition card (35) is connected with triggers circuit (34),
Amplifier driving power supply (31), acousto-optic frequency shifters drive (33), triggers circuit (34), seed laser driving power supply (36), two dimension
Scanner controller (37) is connected with industrial computer (32), is uniformly controlled by industrial computer (32), amplifier driving power supply (31) and loudspeaker
Shape diode amplifier (7) is connected, and acousto-optic frequency shifters drive (33) to be connected with acousto-optic frequency shifters (3).
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| CN106323265B (en) * | 2016-08-23 | 2020-01-14 | 中国航空工业集团公司西安飞行自动控制研究所 | Narrow-linewidth inertial navigation level closed-loop photonic crystal fiber gyroscope and narrow-linewidth laser |
| CN107193015B (en) * | 2017-05-09 | 2020-06-02 | 盐城师范学院 | Ultraviolet three-frequency high spectral resolution laser radar system based on F-P etalon and detection method thereof |
| CN107479046B (en) * | 2017-07-06 | 2019-09-06 | 北京空间机电研究所 | A kind of spaceborne tunable multichannel Fabry-Perot frequency discriminator block |
| CN108507686B (en) * | 2018-02-02 | 2019-09-27 | 北京科益虹源光电技术有限公司 | A kind of the temperature drift feedback method and device of laser center wavelength measurement |
| CN111142121B (en) * | 2019-12-20 | 2022-04-08 | 自然资源部第二海洋研究所 | Brillouin scattering temperature measurement laser radar system based on two-stage virtual image phase array |
| CN112987013A (en) * | 2021-02-26 | 2021-06-18 | 西安工业大学 | System and method for measuring speed of shot in chamber |
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| US5170218A (en) * | 1991-03-29 | 1992-12-08 | Raytheon Company | Apparatus and method for detecting wind direction |
| CN101825713A (en) * | 2009-12-24 | 2010-09-08 | 哈尔滨工业大学 | 2 mu m all-fiber coherent laser Doppler wind finding radar system |
| CN102213763A (en) * | 2011-04-11 | 2011-10-12 | 哈尔滨工业大学 | Coherent Doppler wind measuring laser radar ranging system and method based on mode-locked laser |
| CN102226842A (en) * | 2011-03-25 | 2011-10-26 | 中国科学技术大学 | Optical receiving system of doppler wind lidar |
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2013
- 2013-11-01 CN CN201310542632.6A patent/CN103592652B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5170218A (en) * | 1991-03-29 | 1992-12-08 | Raytheon Company | Apparatus and method for detecting wind direction |
| CN101825713A (en) * | 2009-12-24 | 2010-09-08 | 哈尔滨工业大学 | 2 mu m all-fiber coherent laser Doppler wind finding radar system |
| CN102226842A (en) * | 2011-03-25 | 2011-10-26 | 中国科学技术大学 | Optical receiving system of doppler wind lidar |
| CN102213763A (en) * | 2011-04-11 | 2011-10-12 | 哈尔滨工业大学 | Coherent Doppler wind measuring laser radar ranging system and method based on mode-locked laser |
Non-Patent Citations (1)
| Title |
|---|
| 《Design and performance simulation of a molecular Doppler wind lidar》;Fahua Shen et.al;《Chinese Optics Letters》;20090710;第7卷(第7期);第593-597页 * |
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