CN105005054B - One kind is based on the relevant speed measuring laser radar of the continuous light of time-multiplexed Non-scanning mode - Google Patents
One kind is based on the relevant speed measuring laser radar of the continuous light of time-multiplexed Non-scanning mode Download PDFInfo
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- CN105005054B CN105005054B CN201510528695.5A CN201510528695A CN105005054B CN 105005054 B CN105005054 B CN 105005054B CN 201510528695 A CN201510528695 A CN 201510528695A CN 105005054 B CN105005054 B CN 105005054B
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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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- 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
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- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
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Abstract
The invention discloses one kind based on the relevant speed measuring laser radar of the continuous light of time-multiplexed Non-scanning mode.The invention is using optical fiber type continuous wave laser as light source, by by laser beam focusing in Atmospheric Survey region, realize that wind speed detects using the mode of the aerosol backscatter signal at Laser Focusing and the relevant beat frequency of local oscillator light, wherein receiving terminal is using two optical transmitting and receiving devices with the fixed focus adjustable pointed to, the two optical transmitting and receiving devices pass through time-division multiplex technology alternation, it is achieved thereby that Non-scanning mode wind vector detects, simultaneously, the sensing of the two R-T units can adjust according to different application, so as to realize air wind arrow measurement, with laser radar residing for platform itself speed measurement, with detection accuracy height, low cost, it is compact-sized, electromagnetism interference, the advantages that system is stable.
Description
Technical field
The present invention relates to speed measuring laser radar field, more particularly to one kind to be concerned with based on the continuous light of time-multiplexed Non-scanning mode
Speed measuring laser radar.
Background technology
In air wind speed remote sensing, coherent wind laser radar is due to having the characteristics that high accuracy, high-spatial and temporal resolution, extensively
It is general to be applied to the fields such as the detection of air Wind outline, wind shear early warning, aircraft wake detection, wind power generation, Aero-Space and military affairs.
The light source of coherent wind laser radar uses pulse laser or continuous wave laser.Using the relevant of pulse laser
Wind speed information in the detectable whole laser path of anemometry laser radar, it is the hot research field of laser radar.In the world from
The unit of thing Impulse Coherent Laser Radar research includes NASA, NOAA, american lockheed LMT (Lockheed
Martin), Ray Thcon of the U.S. (Raytheon), relevant company (CTI) of the U.S., MIT (Mitsubishi
Electric), French Leosphere companies, French aerospace space research center (ONERA), Britain SgurrEnergy are public
Department, QinetiQ companies of Britain etc., domestic coherent laser radar is started late, and main unit has Harbin Institute of Technology, electronics
University of Science and Technology, Insititute 27, China Electronics Technology Group Co., Ltd., Shanghai optical precision optical machinery research institute of the Chinese Academy of Sciences, China
The units such as University of Science and Technology, Chinese Marine University.
Using in the coherent laser radar of pulse laser, the modulation of laser pulse and the generation of intermediate-freuqncy signal are adjusted by acousto-optic
Device processed is completed, and for intermediate-freuqncy signal typically between 30MHz to 300MHz, this is just that broadcasting station, Wireless Telecom Equipment are used
Wave band, the band coverage is wide, using intensive.Therefore, on the one hand, the use of intermediate-freuqncy signal, hold coherent laser radar
Easily disturbed by electromagnetic environment；On the other hand, the electromagnetic signal that laser radar radiates in normal work will be set to other electronics
It is standby to interfere.Likewise, there is also this problem for the continuous light coherent laser radar based on acousto-optic modulator shift frequency.
Using in the coherent wind laser radar system of continuous wave laser, by by laser beam focusing in Atmospheric Survey area
Domain, realize that wind speed detects using the mode of the aerosol backscatter signal at Laser Focusing and the relevant beat frequency of local oscillator light.Compare
In pulse laser, because the continuous diode laser and semiconductor laser of commercialization can meet the light of coherent laser radar
Source requirement, continuous wave laser low cost.Therefore, in special applications, the coherent laser radar using continuous light laser has
Unique advantage.
Because single beam laser is only capable of providing the wind speed information in laser path, in order to obtain wind vector, coherent laser radar
It generally is equipped with scanner.Scan mode has：Plane position indicator scanning (Plan Position Indicator, PPI),
Range-height indicator scanning (Range Height Indicator, RAI), Velocity Azimuth angle show (Velocity-
Azimuth-Display, VAD) and Doppler beam sharpening (Doppler-Beam-Swinging, DBS).Scanner is typically adopted
The ZephiR series coherent laser radar produced with mechanical structure, such as QinetiQ companies, which uses, rotates prism, Britain
SgurrEnergy companies use two separate mirrors.
There is certain limitation in the use of high-accuracy mechanical formula scanner, on the one hand its is expensive, bulky, easy
Abrasion；Still further aspect, efficiency reduces when vibration will cause telescope by signal optically coupling to optical fiber caused by scanner,
And fluctuation of energy caused by vibrating will cause relative intensity noise (RIN).
In summary, coherent laser radar has the characteristics of high accuracy, high-spatial and temporal resolution, and application prospect is extensive.But
In some special occasions, such as wind-power electricity generation, motorboat itself speed and circumferential velocity measurement only need the application of single-point wind vector
In, because the mechanical scan coherent laser radar cost using pulse laser is high, limit its application.
The content of the invention
It is an object of the invention to provide one kind based on the relevant speed measuring laser radar of the continuous light of time-multiplexed Non-scanning mode, have
Degree of precision, and cost is relatively low.
The purpose of the present invention is achieved through the following technical solutions：
One kind is based on the relevant speed measuring laser radar of the continuous light of time-multiplexed Non-scanning mode, including：Continuous light laser 1, light
Fine beam splitter 2, photoswitch 3, the first optical fiber circulator 4, the first optical transmitting and receiving device 5, the first fiber coupler 6, the second optical fiber
Coupler 7, detector 8, capture card 9, data processing and display system 10, the second optical fiber circulator 11, the second optical transmitting and receiving dress
Put 12 and signal generator 13；Wherein：
The output end of continuous light laser 1 is connected with the input of fiber optic splitter 2, the output terminals A of fiber optic splitter 2 and light
The input connection of switch 3, the control signal input of photoswitch 3 are connected with the control signal output of signal generator 13；
The photoswitch 3 also has two output ends：Wherein output end B is connected with the A ports of the first optical fiber circulator 4,
The B ports of first optical fiber circulator 4 are connected with the first optical transmitting and receiving device 5, and continuous laser is received by the first optical transmitting and receiving device 5
With atmospheric interaction caused by signal, the C-terminal mouth of the first optical fiber circulator 4 is connected with the A ports of the first fiber coupler 6；
Output terminals A therein is connected with the A ports of the second optical fiber circulator 11, B ports and the second optics of the second optical fiber circulator 11
R-T unit 12 connects, the signal as caused by the second optical transmitting and receiving device 12 receives continuous laser and atmospheric interaction, and second
The C-terminal mouth of optical fiber circulator 11 is connected with the B ports of the first fiber coupler 6；
The output end of first fiber coupler 6 is connected with the B ends of the second fiber coupler 7, and the output of fiber optic splitter 2
End B is connected with the A ports of the second fiber coupler 7, and the output end of the second fiber coupler 7 is connected with the input of detector 8,
The output end of detector 8 is connected with the input of capture card 9, the output end of capture card 9 and data processing and display system 10
Input connects.
Further, when the photoswitch 3 opens output end B according to the control signal of signal generator 13, by first
Optical transmitting and receiving device 5 receives the local oscillator light that continuous laser exports with signal caused by atmospheric interaction and fiber optic splitter 2
It is mixed in the second fiber coupler 7；
When the photoswitch 3 opens output terminals A according to the control signal of signal generator 13, filled by the second optical transmitting and receiving
12 reception continuous lasers are put with signal caused by atmospheric interaction and the local oscillator light of the output of fiber optic splitter 2 in the second optical fiber
Coupler 7 is mixed.
Further, the photoswitch 3 includes：
Photoswitch based on Mach-Zehnder interferometer, based on Polarization Controller and polarization beam apparatus cascade photoswitch with
Mechanical Transflective photoswitch.
Further, the first optical transmitting and receiving device 5 and the second optical transmitting and receiving device 12 are focus adjustable formula telescope,
Focal length by adjusting optical transmitting and receiving device can realize the wind speed detection at different distance.
Further, when the first optical transmitting and receiving device 5 and the θ of angle 2 of the second optical transmitting and receiving device 12 scope are the θ of 0 ＜ 2
During ＜ π, for measuring air wind vector；
As 2 θ of angle=π, and the sensing of the first optical transmitting and receiving device 5 and the second optical transmitting and receiving device 12 and laser radar institute
When the direct of travel of place's platform is consistent, the dividing in beam direction for itself speed of measuring table simultaneously and air wind vector
Speed.
Further, continuous light laser 1, fiber optic splitter 2, photoswitch 3, the first optical fiber circulator 4, first light
The fine fiber coupler 7 of coupler 6 and second uses polarization-maintaining device.
As seen from the above technical solution provided by the invention, its not only measurable air wind vector, and can surveying
Measure itself speed of platform residing for laser radar；In addition, by using the frame mode of all -fiber, continuous light detection mode,
Reception mode, the time-multiplexed working method of fixed optical transmitting and receiving device, are realized residing for air wind vector and laser radar
The function of platform itself speed, it has detection accuracy height, low cost, compact-sized, electromagnetism interference, system stabilization etc. excellent
Point.
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 provided in an embodiment of the present invention a kind of based on the relevant speed measuring laser radar of the continuous light of time-multiplexed Non-scanning mode
Structural representation；
Fig. 2 is provided in an embodiment of the present invention a kind of based on the relevant speed measuring laser radar of the continuous light of time-multiplexed Non-scanning mode
Working timing figure；
Fig. 3 for it is provided in an embodiment of the present invention another be based on the relevant laser thunder that tests the speed of the continuous light of time-multiplexed Non-scanning mode
Up to schematic diagram.
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
Fig. 1 is provided in an embodiment of the present invention a kind of based on the relevant speed measuring laser radar of the continuous light of time-multiplexed Non-scanning mode
Structural representation.As shown in figure 1, it mainly includes：Continuous light laser 1, fiber optic splitter 2, photoswitch 3, the first optical fiber
Circulator 4, the first optical transmitting and receiving device 5, the first fiber coupler 6, the second fiber coupler 7, detector 8, capture card 9, number
According to processing and display system 10, the second optical fiber circulator 11, the second optical transmitting and receiving device 12 and signal generator 13；Wherein：
The output end of continuous light laser 1 is connected with the input of fiber optic splitter 2, the output terminals A of fiber optic splitter 2 and light
The input connection of switch 3, the control signal input of photoswitch 3 are connected with the control signal output of signal generator 13；
The photoswitch 3 also has two output ends：Wherein output end B is connected with the A ports of the first optical fiber circulator 4,
The B ports of first optical fiber circulator 4 are connected with the first optical transmitting and receiving device 5, and continuous laser is received by the first optical transmitting and receiving device 5
With atmospheric interaction caused by signal, the C-terminal mouth of the first optical fiber circulator 4 is connected with the A ports of the first fiber coupler 6；
Output terminals A therein is connected with the A ports of the second optical fiber circulator 11, B ports and the second optics of the second optical fiber circulator 11
R-T unit 12 connects, the signal as caused by the second optical transmitting and receiving device 12 receives continuous laser and atmospheric interaction, and second
The C-terminal mouth of optical fiber circulator 11 is connected with the B ports of the first fiber coupler 6；
The output end of first fiber coupler 6 is connected with the B ends of the second fiber coupler 7, and the output of fiber optic splitter 2
End B is connected with the A ports of the second fiber coupler 7, and the output end of the second fiber coupler 7 is connected with the input of detector 8,
The output end of detector 8 is connected with the input of capture card 9, the output end of capture card 9 and data processing and display system 10
Input connects.
Preferably, continuous light laser 1, fiber optic splitter 2, photoswitch 3, the first optical fiber circulator 4, first optical fiber
The fiber coupler 7 of coupler 6 and second uses polarization-maintaining device.
Preferably, described detector 8 is balanced detector.
Preferably, the first optical transmitting and receiving device 5 and the second optical transmitting and receiving device 12 are focus adjustable formula telescope, are led to
Overregulating the focal length of optical transmitting and receiving device can realize that the wind speed at different distance detects.Wherein, the selection of focal length is according to being applied
Depending on platform is to the influence of ambient wind velocity, such as in large-scale hip-based platform, platform itself traveling process will be influenceed around platform
Wind field, telescope focal length need to be adjusted far, such as be adjusted to 100m；And when small-sized platform is run, platform self-operating is to ambient wind
Field influences little, can closely to detect telescope focal length tune with raising signal to noise ratio.
In the embodiment of the present invention, when the photoswitch 3 opens output end B according to the control signal of signal generator 13,
Signal and fiber optic splitter 2 export as caused by the first optical transmitting and receiving device 5 receives continuous laser and atmospheric interaction
Local oscillator light is mixed in the second fiber coupler 7；
When the photoswitch 3 opens output terminals A according to the control signal of signal generator 13, filled by the second optical transmitting and receiving
12 reception continuous lasers are put with signal caused by atmospheric interaction and the local oscillator light of the output of fiber optic splitter 2 in the second optical fiber
Coupler 7 is mixed.
The type of the photoswitch 3 includes but is not limited to be based on Mach-Zehnder interferometer (Mach-Zehnder
Interferometer, MZI) photoswitch, based on Polarization Controller and polarization beam apparatus cascade photoswitch, mechanical Transflective
Photoswitch etc..
The selection of photoswitch 3 is depending on different application, for example, can use machinery thoroughly in the application for requiring low speed switching
Trans photoswitch, and in the application of switching at a high speed is required, the photoswitch based on MZI can be used, or use and be based on Polarization Control
Device cascades the photoswitch to be formed with polarization beam apparatus.
In addition, the switching frequency of photoswitch depending on detection signal to noise ratio, requires to detect in a collection period in principle
Time-domain signal be fourier transformed after the air speed error that measures in setting error threshold.
As shown in Fig. 2 being the working timing figure of the present invention, wherein Fig. 2 (1) is the drive signal of photoswitch 3, works as photoswitch
When 3 drive signals are in high level, continuous light is emitted from the first optical transmitting and receiving device 5, its heterodyne signal detected such as Fig. 2
(2) shown in；When photoswitch drive signal is in low level, continuous light is emitted from the second optical transmitting and receiving device 12, what it was detected
Heterodyne signal is as shown；The total heterodyne signal detected in time domain is believed referring to Fig. 2 (4) when to the heterodyne shown in Fig. 2 (3)
Number carry out after Fourier transformation shown in power spectrum such as Fig. 2 (5) for obtaining, it is finally, true by maximum likelihood discrete spectrum peak estimation
Determine wind speed size and wind speed deviation.
In Fig. 2, the duration of Δ T of high level in the drive signal of photoswitch 31With low level duration of Δ T2Root
Depending on detection signal to noise ratio, the air speed error that time-domain signal measures after being fourier transformed in a collection period is required in principle
In setting error threshold.
For the ease of understanding the present invention, it is described below based on the relevant speed measuring laser radar of the continuous light of time-multiplexed Non-scanning mode
Principle.
Coherent wind laser radar is using Doppler effect measurement wind speed, wherein radial direction wind speed νLOSWith Doppler frequency shift υD
Relation meet：
In formula, λ is laser light incident wavelength.
In continuous light coherent laser radar, by by laser beam focusing in Atmospheric Survey region, at Laser Focusing
The aerosol backscatter signal of (laser beam waist) is concerned with beat frequency to measure air wind speed, wherein Range resolution information with local oscillator light
It can be realized by adjusting laser beam waist position.
Shown in Figure 1, the direct of travel of platform residing for coherent laser radar dashed lines receive by arrow, the first optics
Transmitting apparatus 5 and the angle theta of horizontal direction, the second optical transmitting and receiving device 12 and the angle of horizontal direction are θ, wherein 0 ＜ θ ＜ π are (excellent
θ=30 ° of choosing).In the embodiment of the present invention, setting air wind vector isDirection is φ, as shown in solid arrow in Fig. 1, is
Avoid confusion, it is assumed that θ-pi/2 ＜ φ ＜ θ+pi/2.
Therefore, wind vector (i.e. the direct of travel of platform residing for coherent laser radar) in the horizontal direction can be obtained by calculating
Projected size be
ν in formulaLOS1The laser path for representing to measure by the first optical transmitting and receiving device 5 is to wind speed, νLOS2Expression passes through the second light
Laser path that R-T unit 12 measures is learned to wind speed.
It is similar, wind vector vertical direction (i.e. with coherent laser radar residing for platform direct of travel it is vertical) size
For
When θ=30 °, formula (2) and formula (3) can abbreviation be
The size of wind vector can be solved by two equations (2) and (3)With the direction φ of wind vector.
On the other hand, in the embodiment of the present invention, the first optical transmitting and receiving device 5 and the second optical transmitting and receiving device 12
It can be pointed to according to different application adjustment, in the structure shown in Fig. 1, the first optical transmitting and receiving device 5 and second optical transmitting and receiving
The θ of angle 2 of device 12 scope is the θ ＜ π of 0 ＜ 2, now, available for measurement air wind vector.
As shown in figure 3, now, 2 θ of the angle=π of the two, and the first optical transmitting and receiving device 5 and the second optical transmitting and receiving device
12 sensing is consistent with the direct of travel of platform residing for laser radar, itself speed and air wind available for measuring table simultaneously
Component velocity of the vector in beam direction.
In structure shown in Fig. 3, the structure described in the annexation and Fig. 1 of component is completely the same, its work schedule with
Structure shown in Fig. 1 is consistent, refers to Fig. 2 and description before, here is omitted.It differs only in the first optical transmitting and receiving dress
Put 5 sensings from the second optical transmitting and receiving device 12 and angle is different.
In structure shown in Fig. 3, the direct of travel of platform residing for coherent laser radar arrow dashed lines, it is assumed that its speed
Spend for ν0, the direction and platform direct of travel of the first optical transmitting and receiving device 5 and the second optical transmitting and receiving device 12 are horizontal, but direction phase
Instead.Set air wind vector asDirection is φ, as shown in solid arrow in Fig. 3, speed of the wind vector in platform direct of travel
Degree is projected as ν cos (φ).
Receive the laser path obtained by the first optical transmitting and receiving device 5 is to wind speed
νLOS5=ν0+νcos(φ) (6)
Receive the laser path obtained by the second optical transmitting and receiving device 12 is to wind speed
νLOS12=ν0-νcos(φ) (7)
Solution formula (6) and formula (7) can obtain platform gait of march and air wind vector and be thrown in the speed of platform direct of travel
Shadow is respectively
ν0=(νLOS5+νLOS12)/2 (8)
ν cos (φ)=(νLOS5-νLOS12)/2 (9)
Wherein, air wind vector is being there is known after the speed of platform direct of travel, passing through the wind on platform
The size of air wind vector can be calculated to meter.
In the embodiment of the present invention, using optical fiber type continuous wave laser as light source, by by laser beam focusing in air
Search coverage, realize that wind speed is visited using the mode of the aerosol backscatter signal at Laser Focusing and the relevant beat frequency of local oscillator light
Survey, wherein receiving terminal have the fixed focus adjustable optical transmitting and receiving devices pointed to using two, are looked in the distance by adjusting optics reception
The focal length of mirror can realize the wind vector detection at different distance.Wherein, the selection of focal length according to institute's application platform to ambient wind velocity
Influence depending on, such as in large-scale hip-based platform, platform itself traveling process by influence platform around wind field, need to be by telescope
Focal length is adjusted far, such as is adjusted to 100m；And when small-sized platform is run, platform self-operating is smaller on Wind Field influence, can incite somebody to action
Telescope focal length is adjusted closely to improve the signal to noise ratio of detection.
A kind of relevant speed measuring laser radar of the continuous light of time-multiplexed Non-scanning mode that is based on provided in an embodiment of the present invention has
Following beneficial effect：
1) present invention use continuous wave laser, compared to use pulsed laser coherent wind laser radar system,
The present invention can realize the highly integrated coherent wind laser radar of low cost, all -fiber.Wherein continuous light coherent laser radar
The distance of detection is focal position (laser beam waist) of the laser beam in Atmospheric Survey region, and the present invention can be by adjusting laser
Beam waist position realizes the wind speed detection of different distance point.
2) continuous wave laser is used in the present invention, wind speed detection is carried out in the case where being not provided with acousto-optic modulator (AOM).
In traditional pulsed coherent laser radar, pulse signal is first transmitted into air after AOM shift frequencies, by receiving laser and gas
Backscatter signal realizes that wind speed detects with local oscillator photo-beat frequency caused by colloidal sol interaction.Relevant using pulse laser swashs
In optical radar, the modulation of laser pulse and the generation of intermediate-freuqncy signal are completed by acousto-optic modulator, and intermediate-freuqncy signal typically arrives in 30MHz
Between 300MHz, this is just broadcasting station, wave band used in Wireless Telecom Equipment, and the band coverage is wide, using close
Collection.Therefore, on the one hand, intermediate-freuqncy signal causes coherent laser radar easily to be disturbed by electromagnetic environment；On the other hand, laser radar
The electromagnetic signal radiated in normal work interferes to other electronic equipments.Likewise, based on the continuous of acousto-optic modulator
There is also this problem for light coherent laser radar.The present invention is applicable not only to for the coherent laser radar of AOM shift frequencies
Complex electromagnetic environment, and avoid electromagnetic signal caused by laser radar and disturb other electronic equipments.
3) present invention uses the structure of two fixed optical transmitting and receiving devices, by atmospheric sounding wind vector in two laser
The size and Orientation information of the projection measurement air wind speed in direction.The invention is compared to using mechanical scanner with atmospheric sounding
The coherent laser radar of wind vector is compared, and its is simple in construction, avoids airborne scanner and platform itself vibrates caused prestige
For remote mirror to the decline of optical coupling efficiency, avoiding vibration causes relative intensity noise caused by laser intensity fluctuating.
4) present invention is using the structure of two fixed optical transmitting and receiving devices, and the sensing of the two optical transmitting and receiving devices is same
On one line, and with laser radar residing for platform travel direction it is identical, but point to opposite.Pass through the wind of the two laser radial directions
Speed detection can high-precision inversion workbench gait of march and air wind speed in the component velocity of beam direction, air wind vector then leads to
Cross and obtained with reference to anemoscope.
5) present invention uses the structure of two fixed optical transmitting and receiving devices, compared to using mechanical scanner structure
For laser radar, influence of the laser radar local environment to mechanical scanner is avoided, such as in wind turbine generator, flight
Under the platforms such as device, sea naval vessels, vibration, high wind situation will influence the precision of airborne scanner.
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 (5)
1. one kind is based on the relevant speed measuring laser radar of the continuous light of time-multiplexed Non-scanning mode, it is characterised in that including：Continuous light swashs
Light device (1), fiber optic splitter (2), photoswitch (3), the first optical fiber circulator (4), the first optical transmitting and receiving device (5), the first light
Fine coupler (6), the second fiber coupler (7), detector (8), capture card (9), data processing and display system (10), second
Optical fiber circulator (11), the second optical transmitting and receiving device (12) and signal generator (13)；Wherein：
The output end of continuous light laser (1) is connected with the input of fiber optic splitter (2), fiber optic splitter (2) output terminals A and
The input connection of photoswitch (3), the control signal input of photoswitch (3) export with the control signal of signal generator (13)
End connection；
The photoswitch (3) also has two output ends：Wherein output end B is connected with the A ports of the first optical fiber circulator (4),
The B ports of first optical fiber circulator (4) are connected with the first optical transmitting and receiving device (5), are received and connected by the first optical transmitting and receiving device (5)
Continuous laser and signal, the C-terminal mouth of the first optical fiber circulator (4) and the A of the first fiber coupler (6) caused by atmospheric interaction
Port connects；Output terminals A therein is connected with the A ports of the second optical fiber circulator (11), the B ends of the second optical fiber circulator (11)
Mouth is connected with the second optical transmitting and receiving device (12), and continuous laser and atmospheric interaction are received by the second optical transmitting and receiving device (12)
Caused signal, the C-terminal mouth of the second optical fiber circulator (11) are connected with the B ports of the first fiber coupler (6)；
The output end of first fiber coupler (6) is connected with the B ends of the second fiber coupler (7), and fiber optic splitter (2) is defeated
Go out to hold B and the A ports of the second fiber coupler (7) to be connected, the output end of the second fiber coupler (7) is defeated with detector (8)
Enter end connection, the output end of detector (8) is connected with the input of capture card (9), the output end of capture card (9) and data processing
Connected with the input of display system (10)；
When the photoswitch (3) opens output end B according to the control signal of signal generator (13), filled by the first optical transmitting and receiving
Put (5) and receive continuous laser with signal caused by atmospheric interaction and the local oscillator light of fiber optic splitter (2) output second
Fiber coupler (7) is mixed；
When the photoswitch (3) opens output terminals A according to the control signal of signal generator (13), filled by the second optical transmitting and receiving
Put (12) and receive continuous laser with signal caused by atmospheric interaction and the local oscillator light of fiber optic splitter (2) output second
Fiber coupler (7) is mixed.
2. according to claim 1 a kind of based on the relevant speed measuring laser radar of the continuous light of time-multiplexed Non-scanning mode, it is special
Sign is that the photoswitch (3) includes：
Photoswitch based on Mach-Zehnder interferometer, the photoswitch based on Polarization Controller and polarization beam apparatus cascade and machinery
Transflective photoswitch.
3. according to claim 1 a kind of based on the relevant speed measuring laser radar of the continuous light of time-multiplexed Non-scanning mode, it is special
Sign is,
The first optical transmitting and receiving device (5) and the second optical transmitting and receiving device (12) are focus adjustable formula telescope, pass through regulation
The focal length of optical transmitting and receiving device can realize the wind speed detection at different distance.
4. one kind according to claim 1 or 3 is based on the relevant speed measuring laser radar of the continuous light of time-multiplexed Non-scanning mode, its
It is characterised by,
When the scope of the first optical transmitting and receiving device (5) and the θ of angle 2 of the second optical transmitting and receiving device (12) is 0 ＜, 2 θ ＜ π, use
In measurement air wind vector；
As 2 θ of angle=π, and sensing and laser radar institute of the first optical transmitting and receiving device (5) with the second optical transmitting and receiving device (12)
When the direct of travel of place's platform is consistent, the dividing in beam direction for itself speed of measuring table simultaneously and air wind vector
Speed.
5. according to claim 1 a kind of based on the relevant speed measuring laser radar of the continuous light of time-multiplexed Non-scanning mode, it is special
Sign is,
Continuous light laser (1), fiber optic splitter (2), photoswitch (3), the first optical fiber circulator (4), the first optical fiber coupling
Clutch (6) uses polarization-maintaining device with the second fiber coupler (7).
Priority Applications (1)
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| CN106932785B (en) * | 2017-02-27 | 2019-11-05 | 南京红露麟激光雷达科技有限公司 | A kind of time-multiplexed polarization coherent Doppler wind-observation laser radar |
| JP6797327B2 (en) | 2018-03-29 | 2020-12-09 | 三菱電機株式会社 | Laser radar device |
| CN110531378B (en) * | 2019-06-13 | 2023-07-18 | 山西大学 | Continuous wave laser coherent wind-finding radar system of wind turbine generator |
| JP7019870B1 (en) * | 2021-01-28 | 2022-02-15 | 三菱電機株式会社 | Rider device and transmission / reception separation device |
| WO2023060473A1 (en) * | 2021-10-13 | 2023-04-20 | 深圳市速腾聚创科技有限公司 | Laser radar, and control method for laser radar |
| WO2023065149A1 (en) * | 2021-10-20 | 2023-04-27 | 深圳市速腾聚创科技有限公司 | Laser radar and laser radar control method |
| CN113671464B (en) * | 2021-10-22 | 2022-02-18 | 杭州视光半导体科技有限公司 | Scanning coaxial area array transceiver for on-chip coherence detection |
| CN113777623B (en) * | 2021-11-11 | 2022-02-08 | 中国民航大学 | Prediction and alarm method for airplane wake threat area |
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