CN110161280A - Mixing detection Doppler lidar wind velocity measurement system and its measurement method - Google Patents
Mixing detection Doppler lidar wind velocity measurement system and its measurement method Download PDFInfo
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- CN110161280A CN110161280A CN201910428836.4A CN201910428836A CN110161280A CN 110161280 A CN110161280 A CN 110161280A CN 201910428836 A CN201910428836 A CN 201910428836A CN 110161280 A CN110161280 A CN 110161280A
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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
- 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
- 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
- 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
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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
A kind of mixing detection Doppler lidar wind velocity measurement system and its measurement method, the laser radar apparatus includes the dual laser of first wave length and second wave length, first wave length is directed toward control module, first wave length emits beam expanding telescope module, second wave length beam expanding lens, optical transmitting and receiving switch, spectrum module, receive and dispatch telescope, relay optical module, optical filter, first wave length polarization beam apparatus, FP frequency discriminator, first direct detection optical unit, second direct detection optical unit, first direct detection pick-up probe, second direct detection pick-up probe, second wave length, which receives, is directed toward control module, coherent detection optical unit, coherent detection pick-up probe and host computer data processor.Present invention accomplishes coherent detections and direct detection light source special parameter demand, greatly reduce the complexity of system, and the ease of light source used in mixing Detection Techniques greatly improved.The device is suitable for ground, airborne and Space-borne, high-precision, the measurement of high-resolution atmospheric wind may be implemented, while can satisfy round-the-clock real-time large-range measuring.
Description
Technical field
The invention belongs to laser radar field, especially a kind of mixing detection Doppler lidar wind velocity measurement system and
Its measurement method.The radar system has the laser of two kinds of wave bands of first wave length and second wave length, while using coherent detection skill
The mixing Detection Techniques of art means and incoherent technique means detect wind field, improve the detection energy of atmospheric wind
Power is meteorological research, and environmental monitoring and aerospace applications etc. provide contribution.
Background technique
Atmospheric wind is very important one in atmospheric parameter, it is in the research of weather meteorology, numerical weather forecast, ring
Border monitoring and military aviation application etc. all play a very important role.Especially in wind shear detection, fly to improving
Safe altitude has very important meaning.Doppler anemometry technology can effectively meet high-precision and high-spatial and temporal resolution
The detection demand of wind speed.There are mainly two types of detection methods for Doppler anemometry technology: direct detection method and coherent detection method.Directly
Connecing detection method can use the wind speed information carried in the backscatter signal of molecule or aerosol in atmosphere, be finally inversed by wind speed
As a result, field of detecting is wider, the lower stratosphere wind field of aerosol density can be detected, but is only had in low-altitude detection medium
Measuring wind speed precision.Backscatter signal of the coherent detection method using the particulate in atmosphere, coherent detection technology
The signal-to-noise ratio of Wind Speed Inversion is related to the aerosol concentration in atmosphere, has the characteristics that detectivity height and precision are high, substantially
It is not interfered by sun bias light, so the signal-to-noise ratio of wind speed is better than direct detection in the big convection current atmosphere of aerosol concentration
The signal-to-noise ratio that method obtains, but in the less stratosphere upper atmosphere of aerosol capacity, the information that direct detection obtains is more
Reliably.Two kinds of measurement methods respectively have its superiority and inferiority, but two methods are common to same laser radar wind measuring system i.e. while including
The relevant and direct detection advantage and laser radar wind measuring system for sharing the same laser does not occur also.
Summary of the invention
The purpose of the present invention is to provide a kind of mixing detection Doppler lidar wind velocity measurement system and its measurement sides
The advantages of method, which makes full use of incoherent technique and coherent detection technology, promotes the signal-to-noise ratio of wind speed retrieval, the system
Energy carries out Wind measurement in high-altitude and low latitude simultaneously, and simplifies laser radar transmitting light source, especially puts down in the spaceborne of future
It will play a significant role in platform.It is this feature of second wave length frequency multiplication using first wave length used in incoherent technique, uses
First wave length light in direct detection results from same laser with the second wave length light for coherent detection, passes through laser
The rational design of parameter, while coherent detection and direct detection light source special parameter demand are met, greatly reduce system
The ease of light source used in mixing Detection Techniques greatly improved in complexity.The device is suitable for ground, airborne and spaceborne flat
Platform may be implemented high-precision, the measurement of high-resolution atmospheric wind, while can satisfy the need of the real-time large-range measuring of round-the-clock
It asks.
Basic principle of the invention is that the wind technology low layer big in aerosol concentration is surveyed using coherent Doppler lidar
The high and direct Doppler lidar of high s/n ratio, detection accuracy in atmosphere surveys the high feature of wind technology detection height, in conjunction with
The advantage of two kinds of Detecting Systems, the reception data of two kinds of radars is merged, more high s/n ratio and detection is obtained after splicing
The wide atmospheric wind profile information of range.
Technical solution of the invention is as follows:
A kind of mixing detection Doppler lidar wind velocity measurement system, it is characterized in that, including first wave length and second
The dual laser of wavelength, first wave length are directed toward control module, first wave length transmitting beam expanding telescope module, second wave length and are expanded
Shu Jing, optical transmitting and receiving switch, spectrum module, transmitting-receiving telescope, relay optical module, optical filter, first wave length polarization point
Beam device, FP frequency discriminator, the first direct detection optical unit, the second direct detection optical unit, the first direct detection receive detection
Device, the second direct detection pick-up probe, second wave length, which receive, is directed toward control module, coherent detection optical unit, coherent detection
Pick-up probe and host computer data processor；
The dual laser includes output first wave length pulse laser delivery outlet, the output of second wave length pulse laser
Mouthful and second wave length continuous laser delivery outlet, the second wave length continuous laser for second wave length pulse laser provide seed light and
Local oscillator light is provided for coherent detection pick-up probe, the first wave length pulse laser delivery outlet of the dual laser is through
One wavelength is directed toward control module and is connected with the input terminal that first wave length expands transmitter-telescope, which expands transmitting and look in the distance
Laser of the mirror to atmospheric sounding spatial emission first wave length pulse laser, as direct detection；
The second wave length pulse laser delivery outlet of the dual laser is through second wave length beam expanding lens, second wave length light
Learn switch, spectrum module is connected with the input terminal of transmitting-receiving telescope, the transmitting-receiving telescope is to atmospheric sounding spatial emission the
Two wavelength pulsed lasers, the laser as coherent detection；
The second wave length continuous laser delivery outlet of the dual laser and the coherent detection pick-up probe
The 2nd input terminal be connected, provide local oscillator light for the coherent detection pick-up probe；
The transmitting-receiving telescope receives the first wave length echo-signal and second of atmospheric molecule scattering and aerosol scattering
Incident echo-signal light is divided into first wave by the wavelength echo-signal input spectrum module, the spectrum module
Long echo signal light and second wave length echo-signal light, the first wave length echo-signal light successively pass through the relay optical
Module, optical filter enter the first wave length polarization beam apparatus, which believes first wave length echo
Number light is divided into orthogonal polarized light and horizontal polarization light, and after the frequency discriminator frequency discrimination, the orthogonal polarized light and level are inclined
Vibration light inputs the first detection optical unit and the second detection optical unit respectively, direct by described first respectively later
It detects pick-up probe and the second direct detection pick-up probe receives, the first direct detection pick-up probe and second
The output end of direct detection pick-up probe refers to the 1st input terminal of the host computer data processor, first wave length respectively
It is connected to the 2nd input terminal of control module；
It is successively the coherent detection transmit-receive switch module, relevant along the second wave length echo-signal light direction
Control module is directed toward in detection, coherent detection optical unit is connected with the 1st input terminal of coherent detection pick-up probe, described
The 2nd output end of coherent detection pick-up probe be connected with the 2nd input terminal that the coherent detection is directed toward control module, institute
1st output end of the coherent detection pick-up probe stated is connected with the 2nd input terminal of host computer data processor.
The dual laser generates the laser of two kinds of wavelength of first wave length and second wave length simultaneously, and first wave length swashs
Light is second wave length laser freuqency doubling light.
Using the measurement method of above-mentioned mixing detection Doppler lidar wind velocity measurement system, it is characterized in that, the party
Method includes the following steps:
1) after the atmospheric wind distribution Doppler lidar system starting described in, the first of the dual laser
The first wave length pulse laser of wavelength pulsed laser delivery outlet output is directed toward control module through first wave length, first wave length expands hair
Penetrate laser of the telescope to atmospheric sounding spatial emission first wave length pulse laser, as direct detection；
2) the second wave length pulse laser warp of the second wave length pulse laser delivery outlet output of the dual laser described in
Second wave length beam expanding lens, second wave length optical switch, spectrum module and transmitting-receiving telescope, the transmitting-receiving telescope are big to detection
Headroom emits second wave length pulse laser, the laser as coherent detection；The second wave length of the dual laser connects
Continuous laser output is connected with the 2nd input terminal of the coherent detection pick-up probe, receives and visits for the coherent detection
It surveys device and local oscillator light is provided；
3) the transmitting-receiving telescope described in receives the first wave length echo-signal and the of atmospheric molecule scattering and aerosol scattering
Incident echo-signal light is divided into first by the two wavelength echo-signals input spectrum module, the spectrum module
Wavelength echo-signal light and second wave length echo-signal light, the first wave length echo-signal light successively pass through the relaying light
Learn module, optical filter enters the first wave length polarization beam apparatus, the first wave length polarization beam apparatus is by first wave length echo
Signal light is divided into orthogonal polarized light and horizontal polarization light, after the frequency discriminator frequency discrimination, the orthogonal polarized light and level
Polarised light inputs the first detection optical unit and the second detection optical unit respectively, straight by described first respectively later
It connects detection pick-up probe and the second direct detection pick-up probe receives, the first direct detection pick-up probe and the
On the one hand the received information of two direct detection pick-up probes inputs the host computer data processor, at host computer data
Direct atmospheric wind information is finally inversed by after reason device data processing；
4) the second wave length echo-signal light described in successively refers to through the coherent detection transmit-receive switch module, coherent detection
It is concerned with to described in control module, coherent detection optical unit and the 1st input terminal of the coherent detection pick-up probe input
Pick-up probe is detected, with the second wave length continuous laser inputted from the 2nd input terminal of the coherent detection pick-up probe
It forms coherent detection to receive, be finally inversed by after host computer data processor data processing described in the coherent detection information input relevant
The atmospheric wind information of detection；
5) the first direct detection pick-up probe and the second received information input of direct detection pick-up probe described in
The first wave length is directed toward control module to adjust the optical axis direction that the first wave length expands transmitter-telescope；Described
The received second wave length echo-signal light of coherent detection pick-up probe is directed toward described in control module adjusting by second wave length
The optical axis of coherent detection optical unit is directed toward.Therefore it ensure that the coaxiality of direct detection optical path and coherent detection transmitting-receiving optical path；
6) host computer data processor described in is by the direct atmospheric wind information and the coherent detection
Atmospheric wind obtains high-precision, the atmospheric wind information of wide-measuring range after information merging and Data Fusion.
The beneficial effects of the present invention are:
1. present invention mixing detection Doppler lidar wind velocity measurement system, while playing Doppler's direct detection laser
The advantages of radar system and Doppler's coherent wind radar system, is spliced by data fusion and data, improves measurement result
Signal-to-noise ratio and investigative range.
2. present invention mixing detection Doppler lidar wind velocity measurement system, laser light source use same pulse laser
Device, while first wave length and second wave length pulse laser are exported, a laser meets direct detection and coherent detection light simultaneously
The demand in source, substantially reduces system complexity, improves system ease.
3. present invention mixing detection Doppler lidar wind velocity measurement system, coherent detection and direct detection share same
A telescope, coherent detection have used direct detection part bore, have simplified receiving optics scheme.
Detailed description of the invention
Fig. 1 is that present invention mixing detects Doppler lidar wind velocity measurement system overall structure block diagram.
Specific embodiment
Below with reference to example and attached drawing, the invention will be further described, but protection model of the invention should not be limited with this
It encloses.
First referring to Fig. 1, Fig. 1 is that present invention mixing detects Doppler lidar wind velocity measurement system overall structure frame
Figure.As seen from the figure, dual laser 1, first wave length including first wave length and second wave length are directed toward control module 2, first
Wavelength transmitting beam expanding telescope module 3, second wave length beam expanding lens 4, optical transmitting and receiving switch 5, spectrum module 6, transmitting-receiving are looked in the distance
Mirror 7, relay optical module 8, optical filter 9, first wave length polarization beam apparatus 10, FP frequency discriminator 11, the first direct detection optics list
First 12, second direct detection optical unit 13, the first direct detection pick-up probe 14, the second direct detection pick-up probe
15, second wave length, which receives, is directed toward control module 16, coherent detection optical unit 17, coherent detection pick-up probe 18 and host computer
Data processor 19；
The dual laser 1 is defeated including output first wave length pulse laser delivery outlet, second wave length pulse laser
Outlet and second wave length continuous laser delivery outlet, the second wave length continuous laser provide seed light simultaneously for second wave length pulse laser
And local oscillator light, the first wave length pulse laser output of the dual laser 1 are provided for coherent detection pick-up probe 18
Mouth is directed toward control module 2 through first wave length and is connected with the input terminal that first wave length expands transmitter-telescope 3, which expands
Laser of the transmitter-telescope 3 to atmospheric sounding spatial emission first wave length pulse laser, as direct detection；
The second wave length pulse laser delivery outlet of the dual laser 1 is through second wave length beam expanding lens 4, second wave length
Optical switch 5, spectrum module 6 are connected with the input terminal of transmitting-receiving telescope 7, and the transmitting-receiving telescope 7 is to atmospheric sounding space
Emit second wave length pulse laser, the laser as coherent detection；
The second wave length continuous laser delivery outlet of the dual laser 1 and the coherent detection pick-up probe
18 the 2nd input terminal is connected, and provides local oscillator light for the coherent detection pick-up probe 18；
The transmitting-receiving telescope 7 receives the first wave length echo-signal and second of atmospheric molecule scattering and aerosol scattering
Incident echo-signal light is divided into first by the wavelength echo-signal input spectrum module 6, the spectrum module 6
Wavelength echo-signal light and second wave length echo-signal light, the first wave length echo-signal light successively pass through the relaying light
Learn module 8, optical filter 9 enters the first wave length polarization beam apparatus 10, the first wave length polarization beam apparatus 10 is by first wave
Long echo signal light is divided into orthogonal polarized light and horizontal polarization light, after 11 frequency discrimination of frequency discriminator, the vertical polarization
Light and horizontal polarization light input the first detection optical unit 12 and the second detection optical unit 13 respectively, later respectively by
The first direct detection pick-up probe 14 and the second direct detection pick-up probe 15 receive, and described first directly visits
Survey the output end of pick-up probe 14 and the second direct detection pick-up probe 15 respectively with the host computer data processor
19 the 1st input terminal, the 2nd input terminal of first wave length direction control module 2 are connected；
It is successively the coherent detection transmit-receive switch module 5, relevant along the second wave length echo-signal light direction
Control module 16, coherent detection optical unit 17 and the 1st input terminal phase of coherent detection pick-up probe 18 are directed toward in detection
Even, the 2nd of the 2nd output end of the coherent detection pick-up probe 18 and described coherent detection direction control module 16 the is defeated
Enter end to be connected, the 1st output end and the host computer data processor 19 the 2nd of the coherent detection pick-up probe 18 are defeated
Enter end to be connected.
The dual laser 1 generates the laser of two kinds of wavelength of first wave length and second wave length, first wave length simultaneously
Laser is second wave length laser freuqency doubling light.
Using the measurement method of above-mentioned mixing detection Doppler lidar wind velocity measurement system, this method includes following step
It is rapid:
1) after the atmospheric wind distribution Doppler lidar system starting described in, the of the dual laser 1
The first wave length pulse laser of one wavelength pulsed laser delivery outlet output is directed toward control module 2 through first wave length, first wave length expands
Laser of the beam transmitter-telescope 3 to atmospheric sounding spatial emission first wave length pulse laser, as direct detection；
2) the second wave length pulse laser warp of the second wave length pulse laser delivery outlet output of the dual laser 1 described in
Second wave length beam expanding lens 4, second wave length optical switch 5, spectrum module 6 and transmitting-receiving telescope 7, the transmitting-receiving telescope 7 to
Atmospheric sounding spatial emission second wave length pulse laser, the laser as coherent detection；The second of the dual laser 1
Wavelength continuous laser delivery outlet is connected with the 2nd input terminal of the coherent detection pick-up probe 18, is the relevant spy
It surveys pick-up probe 18 and local oscillator light is provided；
3) the transmitting-receiving telescope 7 described in receives the first wave length echo-signal and the of atmospheric molecule scattering and aerosol scattering
Incident echo-signal light is divided into the by the two wavelength echo-signals input spectrum module 6, the spectrum module 6
One wavelength echo-signal light and second wave length echo-signal light, the first wave length echo-signal light successively pass through the relaying
Optical module 8, optical filter 9 enter the first wave length polarization beam apparatus 10, and the first wave length polarization beam apparatus 10 is by first
Wavelength echo-signal light is divided into orthogonal polarized light and horizontal polarization light, and after 11 frequency discrimination of frequency discriminator, described is vertical inclined
Vibration light and horizontal polarization light input the first detection optical unit 12 and the second detection optical unit 13 respectively, distinguish later
It is received by the first direct detection pick-up probe 14 and the second direct detection pick-up probe 15, described first directly
It detects pick-up probe 14 and on the one hand the received information of the second direct detection pick-up probe 15 inputs the host computer number
According to processor 19, direct atmospheric wind information is finally inversed by after 19 data processing of host computer data processor；
4) the second wave length echo-signal light described in successively passes through the coherent detection transmit-receive switch module 5, coherent detection
It is directed toward control module 16, coherent detection optical unit 17 and the 1st input terminal of coherent detection pick-up probe 18 and inputs institute
The coherent detection pick-up probe 18 stated, with inputted from the 2nd input terminal of the coherent detection pick-up probe 18 second
Wavelength continuous laser forms coherent detection and receives, at 19 data of host computer data processor described in the coherent detection information input
The atmospheric wind information of coherent detection is finally inversed by after reason；
5) the first direct detection pick-up probe 14 and the received information of the second direct detection pick-up probe 15 described in
The input first wave length is directed toward control module 2 and is directed toward with the optical axis that the adjusting first wave length expands transmitter-telescope 3；
The received second wave length echo-signal light of coherent detection pick-up probe 18 is directed toward control module 16 by second wave length
The optical axis for adjusting the coherent detection optical unit 17 is directed toward.Therefore direct detection optical path and coherent detection transmitting-receiving light be ensure that
The coaxiality on road；
6) host computer data processor 19 described in is by the direct atmospheric wind information and the coherent detection
Atmospheric wind through information merge and Data Fusion after obtain high-precision, wide-measuring range atmospheric wind information.
Embodiment
First wave length is 355nm, second wave length 1064nm in example, and wherein 355nm wavelength is the three of 1064nm wavelength
Frequency multiplication.
As shown in Figure 1, atmospheric wind distribution Doppler lidar system of the present invention mainly includes four parts: laser hair
Penetrate source, coherent detection Transmit-Receive Unit, direct detection receiving unit and transmitting-receiving telescope module.One kind being based on Doppler anemometry principle
Carry out the laser radar apparatus of mixing detection to atmospheric wind vertical section using direct detection and coherent detection system simultaneously.It
Comprise the following modules: 355nm and 1064nm dual laser module 1,355nm are directed toward control module 2,355nm transmitting expands
Telescope module 3,1064nm beam expanding lens 4, optical transmitting and receiving switch 5, spectrum module 6, transmitting-receiving telescope 7, relay optical mould
Block 8), optical filter 9,355nm polarization beam apparatus 10, FP frequency discriminator 11, the first direct detection optical unit 12, the second direct detection
Optical unit 13, the first direct detection pick-up probe 14, the second direct detection pick-up probe 15,1064nm, which are received, is directed toward control
System 16 processed, coherent detection optical unit 17, coherent detection receive detecting module 18, host computer data processor 19.
The positional relationship of above-mentioned component is as follows:
The dual laser 1 of the 355nm and 1064nm exports 355nm and 1064nm pulse laser and 1064nm simultaneously
Continuous laser, 1064nm continuous laser provide seed light for 1064nm pulse laser and are that 1064nm coherent detection receives detection
Device 18 provides local oscillator light, and 1064nm pulse laser is made via 1064nm beam expanding lens 41064nm optical switch 5 and transmitting-receiving telescope 7
It is incident in atmosphere for coherent detection 1064nm pulsed laser light source.Dual laser 1 exports 355nm pulse laser simultaneously,
Control module 2 is directed toward by 355nm wavelength, 355nm wavelength expands 355nm laser light of the transmitter-telescope 3 as direct detection
It is incident in atmosphere in source.The 355nm echo-signal of atmospheric molecule scattering and the 1064nm echo-signal of atmospheric aerosol scattering
It is received by transmitting-receiving telescope 7, after being reflected by 355nm and 1064nm wave spectrum spectral module 6,355nm signal light, in
Optical beam transformation is carried out after optical module 8, is divided subsequently into optical filter 9 and 355nm polarization beam apparatus 10 for vertical and parallel polarization
Two-beam enter double Fabry Parot interferometer frequency discriminators 11, after through the first detection optical unit 12 and the second detection optical unit 13
It is received by the first direct detection pick-up probe 14 and the second direct detection pick-up probe 15, finally through host computer data processing
The atmospheric wind information of incoherent technique measurement is finally inversed by after 19 data processing of device.By 355nm and 1064nm wave spectrum point
The 1064nm signal light that optical module 6 obtains is transmitted by spectrum module 6, is referred to by transmit-receive switch module 5, coherent detection
It to control module 16, is received by coherent detection pick-up probe 18, is finally inversed by after 19 data processing of host computer data processor
The atmospheric wind information that coherent detection technology measures.
Finally, again by the atmospheric wind information that direct detection obtains and the atmospheric wind that coherent detection obtains via host computer
High-precision, the atmospheric wind information of wide-measuring range are obtained after the merging of 19 information of data processor and data fusion.
The laser radar system detailed process based on mixing detection Doppler technology atmospheric wind distribution that the present invention is implemented
It is:
The dual laser of 355nm and 1064nm exports 355nm and 1064nm pulse laser simultaneously and 1064nm is continuous
Laser, 355nm pulse laser are emitted using independent beam expanding lens, 1064nm pulsed laser coaxial transmitting and reception, 355nm and
1064nm laser common transmit-receive telescope, laser produce Doppler frequency shift by aerosol in atmosphere and molecule back scattering,
Carry atmosphere wind speed information be received telescope 7 receive after, 1064nm and 355nm are divided through spectroscope 6,1064nm
Signal light enters coherent detection unit, carries out with the continuous local oscillator light of 355nm/1064nm dual laser output mutually dry-mixed
Frequently, it is received by wherein coherent detection module detector 18, the atmospheric aerosol particle back scattering of Different Altitude is obtained after acquisition
Signal, then by data processing algorithm, obtain the atmospheric wind information that coherent detection system is handled out.The light splitting of spectroscope 6 obtains
Another beam signal light enter direct detection receiving unit, successively after relay optical module and DFP interferometer frequency discriminator by
Detector receives, and is utilized the 355nm signal light of atmospheric molecule back scattering, is calculated by direct detection system inversion algorithm
Atmospheric wind information.Two kinds of each have their own advantages of detection method, coherent detection system obtain atmosphere using 1064nm pulse laser
Aerosol back scattering information, there is higher signal-to-noise ratio, and direct detection system obtains atmospheric molecule using 355nm pulse laser and dissipates
Information is penetrated, there is farther investigative range.The wind field information that finally two kinds of Detecting Systems are obtained carries out splicing and data fusion,
Obtain high s/n ratio and the wider array of wind field information of investigative range.Pointing control system is used in systems, is connect by detector
The actual signal intensity received is looked in the distance to receive optical unit progress to direct detection telescope and coherent detection respectively with transmitting-receiving
The optical axis of mirror optical axis is corrected, and guarantees the coaxiality of direct detection and coherent detection transmitting-receiving optical path, reduces transmitting-receiving optical axis is inconsistent and lead
The performance of cause declines.
Claims (3)
1. a kind of mixing detects Doppler lidar wind velocity measurement system, which is characterized in that including first wave length and the second wave
Long dual laser (1), first wave length are directed toward control module (2), first wave length transmitting beam expanding telescope module (3), the
Two wavelength beam expanding lens (4), optical transmitting and receiving switch (5), spectrum module (6), transmitting-receiving telescope (7), relay optical module
(8), optical filter (9), first wave length polarization beam apparatus (10), FP frequency discriminator (11), the first direct detection optical unit (12),
Two direct detection optical units (13), the first direct detection pick-up probe (14), the second direct detection pick-up probe (15),
Second wave length, which receives, is directed toward control module (16), coherent detection optical unit (17), coherent detection pick-up probe (18) and upper
Position machine data processor (19)；
The dual laser (1) includes output first wave length pulse laser delivery outlet, the output of second wave length pulse laser
Mouthful and second wave length continuous laser delivery outlet, the second wave length continuous laser for second wave length pulse laser provide seed light and
Local oscillator light is provided for coherent detection pick-up probe (18), the first wave length pulse laser of the dual laser (1) is defeated
Outlet is directed toward control module (2) through first wave length and is connected with the input terminal that first wave length expands transmitter-telescope (3), the first wave
Length expands laser of the transmitter-telescope (3) to atmospheric sounding spatial emission first wave length pulse laser, as direct detection；
The second wave length pulse laser delivery outlet of the dual laser (1) is through second wave length beam expanding lens (4), second wave length
Optical switch (5), spectrum module (6) are connected with the input terminal of transmitting-receiving telescope (7), and the transmitting-receiving telescope (7) is to detection
Airspace emits second wave length pulse laser, the laser as coherent detection；
The second wave length continuous laser delivery outlet of the dual laser (1) and the coherent detection pick-up probe
(18) the 2nd input terminal is connected, and provides local oscillator light for the coherent detection pick-up probe (18)；
The transmitting-receiving telescope (7) receives the first wave length echo-signal and the second wave of atmospheric molecule scattering and aerosol scattering
Incident echo-signal light is divided into the by the long echo signal input spectrum module (6), the spectrum module (6)
One wavelength echo-signal light and second wave length echo-signal light, the first wave length echo-signal light successively pass through the relaying
Optical module (8), optical filter (9) enter the first wave length polarization beam apparatus (10), the first wave length polarization beam apparatus
(10) first wave length echo-signal light is divided into orthogonal polarized light and horizontal polarization light, after described frequency discriminator (11) frequency discrimination,
The orthogonal polarized light and horizontal polarization light inputs first detection optical unit (12) and the second detection optics respectively
Unit (13), later respectively by the first direct detection pick-up probe (14) and the second direct detection pick-up probe
(15) it receives, the output end of the first direct detection pick-up probe (14) and the second direct detection pick-up probe (15)
The 2nd input of control module (2) is directed toward with the 1st input terminal of the host computer data processor (19), first wave length respectively
End is connected；
It is successively the coherent detection transmit-receive switch module (5), relevant spy along the second wave length echo-signal light direction
It surveys and is directed toward control module (16), coherent detection optical unit (17) and the input of coherent detection pick-up probe (18) the 1st
End is connected, and the 2nd output end of the coherent detection pick-up probe (18) and the coherent detection are directed toward control module
(16) the 2nd input terminal is connected, the 1st output end of the coherent detection pick-up probe (18) and the host computer data
The 2nd input terminal of processor (19) is connected.
2. mixing according to claim 1 detects Doppler lidar wind velocity measurement system, which is characterized in that described
Dual laser (1) generates the laser of two kinds of wavelength of first wave length and second wave length simultaneously, and first wave length laser is the second wave
Long laser freuqency doubling light.
3. special using the measurement method of mixing detection Doppler lidar wind velocity measurement system described in as claimed in claim 1 or 22
Sign is that this method includes the following steps:
1) after the atmospheric wind distribution Doppler lidar system starting described in, the first of the dual laser (1)
The first wave length pulse laser of wavelength pulsed laser delivery outlet output is directed toward control module (2) through first wave length, first wave length expands
Laser of the beam transmitter-telescope (3) to atmospheric sounding spatial emission first wave length pulse laser, as direct detection；
2) the second wave length pulse laser of the second wave length pulse laser delivery outlet output of the dual laser (1) described in is through the
Two wavelength beam expanding lens (4), second wave length optical switch (5), spectrum module (6) and transmitting-receiving telescope (7), the transmitting-receiving are looked in the distance
Laser of the mirror (7) to atmospheric sounding spatial emission second wave length pulse laser, as coherent detection；The dual laser
(1) second wave length continuous laser delivery outlet is connected with the 2nd input terminal of the coherent detection pick-up probe (18), for institute
The coherent detection pick-up probe (18) stated provides local oscillator light；
3) the transmitting-receiving telescope (7) described in receives the first wave length echo-signal and second of atmospheric molecule scattering and aerosol scattering
Incident echo-signal light is divided by the wavelength echo-signal input spectrum module (6), the spectrum module (6)
First wave length echo-signal light and second wave length echo-signal light, the first wave length echo-signal light successively pass through in described
Enter the first wave length polarization beam apparatus (10), the first wave length polarization beam apparatus after optical module (8), optical filter (9)
(10) first wave length echo-signal light is divided into orthogonal polarized light and horizontal polarization light, after described frequency discriminator (11) frequency discrimination,
The orthogonal polarized light and horizontal polarization light inputs first detection optical unit (12) and the second detection optics respectively
Unit (13), later respectively by the first direct detection pick-up probe (14) and the second direct detection pick-up probe
(15) it receives, the first direct detection pick-up probe (14) and second direct detection pick-up probe (15) received letter
On the one hand breath inputs the host computer data processor (19), be finally inversed by after host computer data processor (19) data processing
Direct atmospheric wind information；
4) the second wave length echo-signal light described in successively passes through the coherent detection transmit-receive switch module (5), coherent detection refers to
It is defeated to control module (16), coherent detection optical unit (17) and the 1st input terminal of coherent detection pick-up probe (18)
Enter the coherent detection pick-up probe (18), it is defeated with the 2nd input terminal from the coherent detection pick-up probe (18)
The second wave length continuous laser entered forms coherent detection and receives, host computer data processor described in the coherent detection information input
(19) the atmospheric wind information of coherent detection is finally inversed by after data processing；
5) the first direct detection pick-up probe (14) and second direct detection pick-up probe (15) received information described in
The input first wave length is directed toward control module (2) to adjust the optical axis that the first wave length expands transmitter-telescope (3)
It is directed toward；The received second wave length echo-signal light of coherent detection pick-up probe (18) is directed toward by second wave length and is controlled
The optical axis that module (16) adjusts the coherent detection optical unit (17) is directed toward, and ensure that direct detection optical path and coherent detection
Receive and dispatch the coaxiality of optical path；
6) host computer data processor (19) described in is by the direct atmospheric wind information and the coherent detection
Atmospheric wind obtains high-precision, the atmospheric wind information of wide-measuring range after information merging and Data Fusion.
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| CN112764056A (en) * | 2020-12-24 | 2021-05-07 | 北京遥测技术研究所 | Composite detection laser wind-measuring radar with high-low altitude remote detection capability |
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