CN106291508B - A kind of near infrared band is applicable in coherent wind laser radar relay optical system - Google Patents
A kind of near infrared band is applicable in coherent wind laser radar relay optical system Download PDFInfo
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- CN106291508B CN106291508B CN201610589106.9A CN201610589106A CN106291508B CN 106291508 B CN106291508 B CN 106291508B CN 201610589106 A CN201610589106 A CN 201610589106A CN 106291508 B CN106291508 B CN 106291508B
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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
- G01S7/4811—Constructional features, e.g. arrangements of optical elements common to transmitter and receiver
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A90/00—Technologies having an indirect contribution to adaptation to climate change
- Y02A90/10—Information and communication technologies [ICT] supporting adaptation to climate change, e.g. for weather forecasting or climate simulation
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Abstract
A kind of near infrared band is applicable in coherent wind laser radar relay optical system, including the first single-mode polarization maintaining fiber, first optical fiber collimator, the wave plate of first λ/2, first polarization beam splitter prism, first beam expanding lens, the wave plate of 2nd λ/2, second polarization beam splitter prism, the wave plate of first λ/4, the wave plate of 3rd λ/2, second optical fiber collimator, second beam expanding lens, the wave plate of 4th λ/2, third optical fiber collimator, second single-mode polarization maintaining fiber, third single-mode polarization maintaining fiber, first adjustable optic fibre attenuator, second adjustable optic fibre attenuator, 4th single-mode polarization maintaining fiber to the 11st single-mode polarization maintaining fiber, first 2X2 fiber optic splitters, 2nd 2X2 fiber optic splitters.This system can provide Laser emission and the relay function received for 2.0 mu m coherent anemometry laser radars, and it is adjustable to decay to local reference laser signal, and versatility is strong with technology transplant, and performance is stable, is easy to Project Realization.
Description
Technical field
The present invention relates to a kind of near infrared bands to be applicable in coherent wind laser radar relay optical system, can be near-infrared
Wave band coherent wind laser radar provides Laser emission and the relay function received, and it is adjustable to decay to local laser signal
Section.It can be widely applied to ground, airborne and spaceborne near infrared band coherent wind laser radar system.
Background technology
Near infrared band coherent laser windfinding radar is to carry out the head that whole world high-precision is measured with high-resolution atmospheric wind
Select laser remote sensing instrument, can be widely applied to the extreme weathers early warning such as substandard surface layers wind field, turbulent flow, cyclone, local thunderstorm with
Fields of measurement.
In traditional coherent wind laser radar system, other than optical antenna and optical scanner mechanism, other points are
System uses the integrated package of modularization or optical fiber transmission path as system.Wherein modularization refers mainly to laser assembly, sound
Light modulation element, photoelectric sensor assembly etc., and optical fiber transmission path then includes fiber optic splitter, phase delay device, fiber annular
Device etc..System above building form can make that general system set-up is most compact, integrated level higher.But which exists to laser
The drawbacks such as polarization state modulation difficulty is big, system laser transmission is low with heterodyne efficiency, Wind Sounding Capability is limited.
The present invention technical solution be：A kind of near infrared band is applicable in coherent wind laser radar relay optical system
System is expanded including the first single-mode polarization maintaining fiber, the first optical fiber collimator, the wave plate of the first λ/2, the first polarization beam splitter prism, first
The wave plate of the wave plate of the wave plate of mirror, the 2nd λ/2, the second polarization beam splitter prism, the first λ/4, the 3rd λ/2, the second optical fiber collimator, second are expanded
The wave plate of Shu Jing, the 4th λ/2, third optical fiber collimator, the second single-mode polarization maintaining fiber, third single-mode polarization maintaining fiber, the first tunable optical
Fine attenuator, the second adjustable optic fibre attenuator, the 4th single-mode polarization maintaining fiber, the 5th single-mode polarization maintaining fiber, the 6th single mode polarization-maintaining light
Fibre, the 7th single-mode polarization maintaining fiber, the first 2X2 fiber optic splitters, the 2nd 2X2 fiber optic splitters, the 8th single-mode polarization maintaining fiber, the 9th
Single-mode polarization maintaining fiber, the tenth single-mode polarization maintaining fiber, the 11st single-mode polarization maintaining fiber；
It is transmitted by the pulsed laser signal that external laser transmitting system is sent out by the first single-mode polarization maintaining fiber, into first
Optical fiber collimator carries out beam-expanding collimation, and propagation medium is transformed into free space via optical fiber space；Laser warp after beam-expanding collimation
The wave plate of the first λ/2 is crossed, is divided into two-way after being transferred to the first polarization beam splitter prism, wherein saturating for the first polarization beam splitter prism all the way
The laser signal penetrated is transferred to after the first beam expanding lens expands, and by the wave plate of the 2nd λ/2, then to be transferred to the second polarization beam apparatus inclined
Shake beam splitter prism, is launched after the wave plate of the first λ/4 by optical antenna, forms the first output signal, the first output signal
For coherent wind laser radar pulse signal, for being collided with the aerosol being distributed in air, Mie scattering occurs, generates
Include wind speed Doppler frequency shift laser echo signal；Another way is the laser signal of the first polarization beam splitter prism reflection, is passed through
The wave plate of 3rd λ/2, and be coupled into the 6th single-mode polarization maintaining fiber by the second optical fiber collimator, forms the second output signal, and second
Output signal is coherent wind laser radar reference local oscillator pulsed laser signal, for signal to occur with continuous local oscillator laser signal
Interference generates subsequent with reference to intermediate-freuqncy signal；
The continuous laser signal sent out by external laser transmitting system is by fiber optic splitter using splitting ratio as 90:10 are divided into two
Beam, respectively the second input signal and third input signal；Wherein 90% continuous laser is sent into the second single-mode polarization maintaining fiber,
After the first adjustable optic fibre attenuator, into the 4th single-mode polarization maintaining fiber, the output terminal of the 4th single-mode polarization maintaining fiber together with
After the output terminal of 6th single-mode polarization maintaining fiber enters the first 2X2 fiber optic splitters together, respectively by the 8th single-mode polarization maintaining fiber and
9th single-mode polarization maintaining fiber exports two paths of signals, this two paths of signals is as the reference intermediate frequency in follow-up balanced type photoelectric detecting system
Light input signal；10% continuous laser is sent to third single-mode polarization maintaining fiber, after decaying using the second adjustable optic fibre attenuator,
Into the 5th single-mode polarization maintaining fiber；
By optical antenna receive containing wind speed Doppler frequency shift laser echo signal by the wave plate of the first λ/4, pass through
Second polarization beam splitter prism is transmitted to inverted second beam expanding lens, by enter inject the second beam expanding lens laser beam carry out spot diameter
Shrink beam is transferred to third optical fiber collimator by the wave plate of the 4th λ/2 after shrink beam, is then coupled into the 7th single mode fiber collimator；
The output terminal of 7th single mode fiber collimator together with the 5th single-mode polarization maintaining fiber output terminal enter the 2nd 2X2 fiber optic splitters into
Row closes beam, is exported respectively by the tenth single-mode polarization maintaining fiber and the 11st single-mode polarization maintaining fiber, this two paths of signals is as follow-up balance
The intermediate frequency light input signal of wind speed extraction in formula photoelectric detecting system.
The placement location of first beam expanding lens, the wave plate of the 2nd λ/2 is exchanged, other elements remain unchanged.
Second beam expanding lens, the wave plate position of the 4th λ/2 are exchanged, other elements remain unchanged.
First beam expanding lens, the wave plate placement location of the 2nd λ/2 are exchanged, while by the second beam expanding lens, the wave plate of the 4th λ/2
Position is exchanged, and other elements remain unchanged.
Compared with the prior art, the invention has the advantages that：
(1) present invention proposes the laser relay optical system scheme, and the program can be suitably used near infrared band and be concerned with survey
In wind laser radar system, versatility is strong with technology transplant；
(2) present invention is integrated using elements such as polarizing beam splitter mirror, λ/2, λ/4, polarization beam splitter prism, beam expanding lens and beam-shrinked mirrors
Relay optical system, heterodyne efficiency during coherent detection greatly improved, reduce laser firing signals loss；
(3) present invention places polarization beam splitter prism in laser firing pulses signal propagation path, realizes laser signal
Separation, after which carries out heterodyne beat with continuous local oscillator laser signal, the current intermediate frequency signal formed is follow-up intermediate frequency wind
Field signal acquires and processing.
Description of the drawings
Fig. 1 is the system schematic of embodiment one；
Fig. 2 is the system schematic of embodiment two；
Fig. 3 is the system schematic of embodiment three；
Fig. 4 is the system schematic of embodiment four.
Specific embodiment
The specific embodiment of the present invention is further described in detail below in conjunction with the accompanying drawings.
A kind of near infrared band is applicable in coherent wind laser radar relay optical system, including the first single-mode polarization maintaining fiber 1,
The wave plate 6, second of the wave plate 3 of first optical fiber collimator 2, the first λ/2, the first polarization beam splitter prism 4, the first beam expanding lens 5, the 2nd λ/2
The wave plate 9 of the wave plate 8 of polarization beam splitter prism 7, the first λ/4, the 3rd λ/2, the second optical fiber collimator 10, the second beam expanding lens 11, the 4th λ/2
Wave plate 12, third optical fiber collimator 13, the second single-mode polarization maintaining fiber 14, third single-mode polarization maintaining fiber 15, the first adjustable optic fibre decline
Subtract device 16, the second adjustable optic fibre attenuator 17, the 4th single-mode polarization maintaining fiber 18, the 5th single-mode polarization maintaining fiber 19, the 6th single mode to protect
Polarisation fibre 20, the 7th single-mode polarization maintaining fiber 21, the first 2X2 fiber optic splitters 22, the 2nd 2X2 fiber optic splitters 23, the 8th single mode
Polarization maintaining optical fibre 24, the 9th single-mode polarization maintaining fiber 25, the tenth single-mode polarization maintaining fiber 26, the 11st single-mode polarization maintaining fiber 27.
The the first input pulse laser signal sent out by laser transmitting system is transmitted by the first single-mode polarization maintaining fiber 1, into
Enter the first optical fiber collimator 2 and carry out beam-expanding collimation, propagation medium is transformed into free space via optical fiber space；After beam-expanding collimation
Laser is divided into two-way, wherein being all the way the first polarization point by the wave plate 3 of the first λ/2 after being transferred to the first polarization beam splitter prism 4
The laser signal that beam prism 4 transmits is transferred to after the first beam expanding lens 5 expands, and by the wave plate 6 of the 2nd λ/2, then is transferred to second partially
Shake beam splitter polarization beam splitter prism 7, is launched after the wave plate 8 of the first λ/4 by optical antenna, forms the first output signal,
First output signal is coherent wind laser radar pulse signal, and the purposes of the signal is carried out with the aerosol being distributed in air
Collision, occurs Mie scattering, and generation includes wind speed Doppler frequency shift laser echo signal；Another way is the first polarization beam splitting rib
The laser signal that mirror 4 reflects by the wave plate 9 of the 3rd λ/2, and is coupled into the 6th single mode polarization-maintaining light by the second optical fiber collimator 10
Fibre 20, formed the second output signal, the second output signal be coherent wind laser radar reference local oscillator pulsed laser signal, the letter
Number purposes be with continuous local oscillator laser signal occur signal interference, generate it is subsequent refer to intermediate-freuqncy signal.
The continuous laser signal sent out by laser transmitting system is by fiber optic splitter using splitting ratio as 90:10 are divided into two beams,
Respectively the second input signal and third input signal；Wherein 90% continuous laser enters the second single-mode polarization maintaining fiber 14, warp
After crossing the first adjustable optic fibre attenuator 16, into the 4th single-mode polarization maintaining fiber 18, the output terminal of the 4th single-mode polarization maintaining fiber 18 connects
After the output terminal of same 6th single-mode polarization maintaining fiber 20 enters the progress of the first optical-fiber bundling/beam splitter 22, protected respectively by the 8th single mode
Polarisation fibre 24 and the 9th single-mode polarization maintaining fiber 25 export two paths of signals, this two paths of signals is as in coherent wind laser radar system
Reference intermediate frequency light input signal in balanced type photoelectric detecting system；10% continuous laser enters third single-mode polarization maintaining fiber
15, after decaying using the second adjustable optic fibre attenuator 17, into the 5th single-mode polarization maintaining fiber 19.
By optical antenna receive containing wind speed Doppler frequency shift laser echo signal by the wave plate 8 of the first λ/4, pass through
Second polarization beam splitter prism 7 be transmitted to inverted its function of second beam expanding lens 11 be by the incident laser beam for entering the element into
Row spot diameter shrink beam is transferred to third optical fiber collimator 13 by the wave plate 12 of the 4th λ/2 after shrink beam, it is single to be then coupled into the 7th
Mode fiber collimator 21, the signal are the 4th input signal；The output terminal of 7th single mode fiber collimator 21 is together with the 5th single mode
The output terminal of polarization maintaining optical fibre 19 carries out conjunction beam into the 2nd 2X2 fiber optic splitters 23, respectively by 26 He of the tenth single-mode polarization maintaining fiber
11st single-mode polarization maintaining fiber 27 exports, and forms this two paths of signals and is visited as balanced type photoelectricity in coherent wind laser radar system
The intermediate frequency light input signal of wind speed extraction in examining system.
Embodiment two：Present embodiment by the first input pulse laser that laser transmitting system is sent out as shown in Fig. 2, believed
Number the first single-mode polarization maintaining fiber of process 1 transmits, and carries out beam-expanding collimation into the first optical fiber collimator 2, propagation medium is via optical fiber
Space is transformed into free space；Laser after beam-expanding collimation is by the wave plate 3 of the first λ/2, after being transferred to the first polarization beam splitter prism 4
It is divided into two-way, wherein the laser signal for the transmission of the first polarization beam splitter prism 4 all the way, is transferred to the wave plate 6 of the 2nd λ/2, passes through
After first beam expanding lens 5 expands, then the second polarization beam apparatus polarization beam splitter prism 7 is transferred to, by light after the wave plate 8 of the first λ/4
Learn antenna launch, formed the first output signal, the first output signal be coherent wind laser radar pulse signal, the signal
Purposes be to be collided with the aerosol being distributed in air, Mie scattering occurs, generation includes wind speed Doppler frequency shift and swashs
Optical echo signal；Another way is the laser signal of the first polarization beam splitter prism 4 reflection, by the wave plate 9 of the 3rd λ/2, and by second
Optical fiber collimator 10 is coupled into the 6th single-mode polarization maintaining fiber 20, forms the second output signal, and the second output signal is surveyed to be relevant
Wind laser radar reference local oscillator pulsed laser signal, the purposes of the signal are that signal interference occurs with continuous local oscillator laser signal,
It generates subsequent with reference to intermediate-freuqncy signal.
The continuous laser signal sent out by laser transmitting system is by fiber optic splitter using splitting ratio as 90:10 are divided into two beams,
Respectively the second input signal and third input signal；Wherein 90% continuous laser enters the second single-mode polarization maintaining fiber 14, warp
After crossing the first adjustable optic fibre attenuator 16, into the 4th single-mode polarization maintaining fiber 18, the output terminal of the 4th single-mode polarization maintaining fiber 18 connects
After the output terminal of same 6th single-mode polarization maintaining fiber 20 enters the progress of the first optical-fiber bundling/beam splitter 22, protected respectively by the 8th single mode
Polarisation fibre 24 and the 9th single-mode polarization maintaining fiber 25 export two paths of signals, this two paths of signals is as in coherent wind laser radar system
Reference intermediate frequency light input signal in balanced type photoelectric detecting system；10% continuous laser enters third single-mode polarization maintaining fiber
15, after decaying using the second adjustable optic fibre attenuator 17, into the 5th single-mode polarization maintaining fiber 19.
By optical antenna receive containing wind speed Doppler frequency shift laser echo signal by the wave plate 8 of the first λ/4, pass through
Second polarization beam splitter prism 7 be transmitted to inverted its function of second beam expanding lens 11 be by the incident laser beam for entering the element into
Row spot diameter shrink beam is transferred to third optical fiber collimator 13 by the wave plate 12 of the 4th λ/2 after shrink beam, it is single to be then coupled into the 7th
Mode fiber collimator 21, the signal are the 4th input signal；The output terminal of 7th single mode fiber collimator 21 is together with the 5th single mode
The output terminal of polarization maintaining optical fibre 19 carries out conjunction beam into the 2nd 2X2 fiber optic splitters 23, respectively by 26 He of the tenth single-mode polarization maintaining fiber
11st single-mode polarization maintaining fiber 27 exports, and forms this two paths of signals and is visited as balanced type photoelectricity in coherent wind laser radar system
The intermediate frequency light input signal of wind speed extraction in examining system.
Embodiment three：Present embodiment by the first input pulse laser that laser transmitting system is sent out as shown in figure 3, believed
Number the first single-mode polarization maintaining fiber of process 1 transmits, and carries out beam-expanding collimation into the first optical fiber collimator 2, propagation medium is via optical fiber
Space is transformed into free space；Laser after beam-expanding collimation is by the wave plate 3 of the first λ/2, after being transferred to the first polarization beam splitter prism 4
It is divided into two-way, wherein the laser signal for the transmission of the first polarization beam splitter prism 4 all the way, is transferred to after the first beam expanding lens 5 expands,
By the wave plate 6 of the 2nd λ/2, then the second polarization beam apparatus polarization beam splitter prism 7 is transferred to, by optics after the wave plate 8 of the first λ/4
Antenna is launched, and forms the first output signal, and the first output signal is coherent wind laser radar pulse signal, the signal
Purposes is collided with the aerosol being distributed in air, and Mie scattering occurs, and generation includes wind speed Doppler frequency shift laser
Echo-signal；Another way is the laser signal of the first polarization beam splitter prism 4 reflection, by the wave plate 9 of the 3rd λ/2, and by the second light
Fine collimator 10 is coupled into the 6th single-mode polarization maintaining fiber 20, forms the second output signal, and the second output signal is coherent wind
Laser radar reference local oscillator pulsed laser signal, the purposes of the signal are that signal interference, production occurs with continuous local oscillator laser signal
It is raw subsequent with reference to intermediate-freuqncy signal.
The continuous laser signal sent out by laser transmitting system is by fiber optic splitter using splitting ratio as 90:10 are divided into two beams,
Respectively the second input signal and third input signal；Wherein 90% continuous laser enters the second single-mode polarization maintaining fiber 14, warp
After crossing the first adjustable optic fibre attenuator 16, into the 4th single-mode polarization maintaining fiber 18, the output terminal of the 4th single-mode polarization maintaining fiber 18 connects
After the output terminal of same 6th single-mode polarization maintaining fiber 20 enters the progress of the first optical-fiber bundling/beam splitter 22, protected respectively by the 8th single mode
Polarisation fibre 24 and the 9th single-mode polarization maintaining fiber 25 export two paths of signals, this two paths of signals is as in coherent wind laser radar system
Reference intermediate frequency light input signal in balanced type photoelectric detecting system；10% continuous laser enters third single-mode polarization maintaining fiber
15, after decaying using the second adjustable optic fibre attenuator 17, into the 5th single-mode polarization maintaining fiber 19.
By optical antenna receive containing wind speed Doppler frequency shift laser echo signal by the wave plate 8 of the first λ/4, pass through
Second polarization beam splitter prism 7 is transmitted to the wave plate 12 of the 4th λ/2, then carries out inverted second beam expanding lens 11, its function be by
The laser beam that incidence enters the element carries out spot diameter shrink beam, the beam transmission after shrink beam to third optical fiber collimator 13,
Then the 7th single mode fiber collimator 21 is coupled into, which is the 4th input signal；7th single mode fiber collimator 21 it is defeated
Outlet carries out conjunction beam together with the output terminal of the 5th single-mode polarization maintaining fiber 19 into the 2nd 2X2 fiber optic splitters 23, respectively by the tenth
26 and the 11st single-mode polarization maintaining fiber 27 of single-mode polarization maintaining fiber exports, and forms this two paths of signals as coherent wind laser radar system
The intermediate frequency light input signal of wind speed extraction in system in balanced type photoelectric detecting system.
Embodiment four：Present embodiment as shown in figure 4, present embodiment as shown in Fig. 2, being sent out by laser transmitting system
The first input pulse laser signal transmitted by the first single-mode polarization maintaining fiber 1, carry out expanding standard into the first optical fiber collimator 2
Directly, propagation medium is transformed into free space via optical fiber space；Laser after beam-expanding collimation is transferred to by the wave plate 3 of the first λ/2
It is divided into two-way after first polarization beam splitter prism 4, wherein the laser signal for the transmission of the first polarization beam splitter prism 4 all the way, transmission
To the wave plate 6 of the 2nd λ/2, after the first beam expanding lens 5 expands, then the second polarization beam apparatus polarization beam splitter prism 7 is transferred to, passed through
Launched after the wave plate 8 of first λ/4 by optical antenna, form the first output signal, the first output signal is coherent wind laser
Radar pulse signal, the purposes of the signal are collided with the aerosol being distributed in air, and Mie scattering occurs, and generation includes
There is wind speed Doppler frequency shift laser echo signal；Another way is the laser signal of the first polarization beam splitter prism 4 reflection, by third
The wave plate 9 of λ/2, and be coupled into the 6th single-mode polarization maintaining fiber 20 by the second optical fiber collimator 10, forms the second output signal, and second
Output signal is coherent wind laser radar reference local oscillator pulsed laser signal, and the purposes of the signal is believed with continuous local oscillator laser
Number occur signal interference, generate it is subsequent refer to intermediate-freuqncy signal.
The continuous laser signal sent out by laser transmitting system is by fiber optic splitter using splitting ratio as 90:10 are divided into two beams,
Respectively the second input signal and third input signal；Wherein 90% continuous laser enters the second single-mode polarization maintaining fiber 14, warp
After crossing the first adjustable optic fibre attenuator 16, into the 4th single-mode polarization maintaining fiber 18, the output terminal of the 4th single-mode polarization maintaining fiber 18 connects
After the output terminal of same 6th single-mode polarization maintaining fiber 20 enters the progress of the first optical-fiber bundling/beam splitter 22, protected respectively by the 8th single mode
Polarisation fibre 24 and the 9th single-mode polarization maintaining fiber 25 export two paths of signals, this two paths of signals is as in coherent wind laser radar system
Reference intermediate frequency light input signal in balanced type photoelectric detecting system；10% continuous laser enters third single-mode polarization maintaining fiber
15, after decaying using the second adjustable optic fibre attenuator 17, into the 5th single-mode polarization maintaining fiber 19.
By optical antenna receive containing wind speed Doppler frequency shift laser echo signal by the wave plate 8 of the first λ/4, pass through
Second polarization beam splitter prism 7 is transmitted to the wave plate 12 of the 4th λ/2, then carries out inverted second beam expanding lens 11, its function be by
The laser beam that incidence enters the element carries out spot diameter shrink beam, the beam transmission after shrink beam to third optical fiber collimator 13,
Then the 7th single mode fiber collimator 21 is coupled into, which is the 4th input signal；7th single mode fiber collimator 21 it is defeated
Outlet carries out conjunction beam together with the output terminal of the 5th single-mode polarization maintaining fiber 19 into the 2nd 2X2 fiber optic splitters 23, respectively by the tenth
26 and the 11st single-mode polarization maintaining fiber 27 of single-mode polarization maintaining fiber exports, and forms this two paths of signals as coherent wind laser radar system
The intermediate frequency light input signal of wind speed extraction in system in balanced type photoelectric detecting system.
The content not being described in detail in description of the invention belongs to the known technology of professional and technical personnel in the field.
Claims (4)
1. a kind of near infrared band is applicable in coherent wind laser radar relay optical system, it is characterised in that：Including the first single mode
The wave plate (3) of polarization maintaining optical fibre (1), the first optical fiber collimator (2), the first λ/2, the first polarization beam splitter prism (4), the first beam expanding lens
(5), the wave plate (9) of the wave plate (8) of the wave plate (6) of the 2nd λ/2, the second polarization beam splitter prism (7), the first λ/4, the 3rd λ/2, the second optical fiber
The wave plate (12) of collimator (10), the second beam expanding lens (11), the 4th λ/2, third optical fiber collimator (13), the second single-mode polarization maintaining fiber
(14), third single-mode polarization maintaining fiber (15), the first adjustable optic fibre attenuator (16), the second adjustable optic fibre attenuator (17), the 4th
Single-mode polarization maintaining fiber (18), the 5th single-mode polarization maintaining fiber (19), the 6th single-mode polarization maintaining fiber (20), the 7th single-mode polarization maintaining fiber
(21), the first 2X2 fiber optic splitters (22), the 2nd 2X2 fiber optic splitters (23), the 8th single-mode polarization maintaining fiber (24), the 9th list
Mould polarization maintaining optical fibre (25), the tenth single-mode polarization maintaining fiber (26), the 11st single-mode polarization maintaining fiber (27)；
It is transmitted by the pulsed laser signal that external laser transmitting system is sent out by the first single-mode polarization maintaining fiber (1), into first
Optical fiber collimator (2) carries out beam-expanding collimation, and propagation medium is transformed into free space via optical fiber space；Laser after beam-expanding collimation
By the wave plate (3) of the first λ/2, it is divided into two-way after being transferred to the first polarization beam splitter prism (4), wherein being all the way the first polarization point
The laser signal of beam prism (4) transmission is transferred to after the first beam expanding lens (5) expands, and by the wave plate (6) of the 2nd λ/2, then is transferred to
Second polarization beam apparatus polarization beam splitter prism (7) is launched after the wave plate (8) of the first λ/4 by optical antenna, forms first
Output signal, the first output signal are coherent wind laser radar pulse signal, for being carried out with the aerosol being distributed in air
Collision, occurs Mie scattering, and generation includes wind speed Doppler frequency shift laser echo signal；Another way is the first polarization beam splitting rib
The laser signal of mirror (4) reflection, by the wave plate (9) of the 3rd λ/2, and is coupled into the 6th single mode by the second optical fiber collimator (10)
Polarization maintaining optical fibre (20), forms the second output signal, and the second output signal is coherent wind laser radar reference local oscillator pulse laser
Signal for signal interference to occur with continuous local oscillator laser signal, generates subsequent with reference to intermediate-freuqncy signal；
The continuous laser signal sent out by external laser transmitting system is by fiber optic splitter using splitting ratio as 90:10 are divided into two beams,
Respectively the second input signal and third input signal；Wherein 90% continuous laser is sent into the second single-mode polarization maintaining fiber
(14), after using the first adjustable optic fibre attenuator (16), into the 4th single-mode polarization maintaining fiber (18), the 4th single-mode polarization maintaining fiber
(18) after output terminal enters the first 2X2 fiber optic splitters (22) together together with the output terminal of the 6th single-mode polarization maintaining fiber (20),
Two paths of signals is exported by the 8th single-mode polarization maintaining fiber (24) and the 9th single-mode polarization maintaining fiber (25) respectively, after this two paths of signals is used as
Reference intermediate frequency light input signal in continuous balanced type photoelectric detecting system；10% continuous laser is sent to third single-mode polarization maintaining fiber
(15), after decaying using the second adjustable optic fibre attenuator (17), into the 5th single-mode polarization maintaining fiber (19)；
By optical antenna receive containing wind speed Doppler frequency shift laser echo signal by the wave plate (8) of the first λ/4, by the
Two polarization beam splitter prisms (7) are transmitted to inverted second beam expanding lens (11), will enter to inject the laser beam of the second beam expanding lens (11) into
Row spot diameter shrink beam is transferred to third optical fiber collimator (13) by the wave plate (12) of the 4th λ/2 after shrink beam, is then coupled into
Seven single mode fiber collimators (21)；The output terminal of 7th single mode fiber collimator (21) is together with the 5th single-mode polarization maintaining fiber (19)
Output terminal carries out conjunction beam into the 2nd 2X2 fiber optic splitters (23), single by the tenth single-mode polarization maintaining fiber (26) and the 11st respectively
Mould polarization maintaining optical fibre (27) exports, this two paths of signals is defeated as the intermediate frequency light of the wind speed extraction in follow-up balanced type photoelectric detecting system
Enter signal.
2. a kind of near infrared band according to claim 1 is applicable in coherent wind laser radar relay optical system, special
Sign is：The placement location of first beam expanding lens (5), the wave plate (6) of the 2nd λ/2 is exchanged, the placement location of other elements is protected
It holds constant.
3. a kind of near infrared band according to claim 1 is applicable in coherent wind laser radar relay optical system, special
Sign is：The placement location of second beam expanding lens (11), the wave plate (12) of the 4th λ/2 is exchanged, the placement location of other elements
It remains unchanged.
4. a kind of near infrared band according to claim 1 is applicable in coherent wind laser radar relay optical system, special
Sign is：First beam expanding lens (5), wave plate (6) placement location of the 2nd λ/2 are exchanged, while by the second beam expanding lens (11),
Four λ/2 are exchanged wave plate (12) position, and the placement location of other elements remains unchanged.
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