CN106291508A - A kind of near infrared band is suitable for coherent wind laser radar relay optical system - Google Patents
A kind of near infrared band is suitable for coherent wind laser radar relay optical system Download PDFInfo
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- CN106291508A CN106291508A CN201610589106.9A CN201610589106A CN106291508A CN 106291508 A CN106291508 A CN 106291508A CN 201610589106 A CN201610589106 A CN 201610589106A CN 106291508 A CN106291508 A CN 106291508A
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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 suitable for coherent wind laser radar relay optical system, including the first single-mode polarization maintaining fiber, first optical fiber collimator, oneth λ/2 wave plate, first polarization beam splitter prism, first beam expanding lens, 2nd λ/2 wave plate, second polarization beam splitter prism, oneth λ/4 wave plate, 3rd λ/2 wave plate, second optical fiber collimator, second beam expanding lens, 4th λ/2 wave plate, 3rd optical fiber collimator, second single-mode polarization maintaining fiber, 3rd single-mode polarization maintaining fiber, first adjustable optic fibre attenuator, second adjustable optic fibre attenuator, 4th single-mode polarization maintaining fiber is to the 11st single-mode polarization maintaining fiber, oneth 2X2 fiber optic splitter, 2nd 2X2 fiber optic splitter.Native system can be the relay functions that 2.0 mu m coherent anemometry laser radars provide Laser emission and reception, and to local reference laser signal attenuation scalable, versatility is strong with technology transplant, stable performance, is prone to Project Realization.
Description
Technical field
The present invention relates to a kind of near infrared band and be suitable for coherent wind laser radar relay optical system, can be near-infrared
Wave band coherent wind laser radar provides the relay function of Laser emission and reception, and adjustable to local laser signal decay
Joint.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 by the head that whole world high accuracy is measured with high-resolution atmospheric wind
Select laser remote sensing instrument, can be widely applied to the extreme weather early warning such as substandard surface layers wind field, turbulent flow, cyclone, locally thunderstorm with
Fields of measurement.
In traditional coherent wind laser radar system, in addition to optical antenna with optical scanning mechanism, other point is
System all uses modularity or optical fiber transmission path as the integrated package of system.Wherein modularity refers mainly to laser assembly, sound
Light modulation element, photoelectric sensor assembly etc., 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 the compactest, integrated level is higher.But which exists laser
The drawbacks such as polarization state modulation difficulty is big, system laser transmits and heterodyne efficiency is low, Wind Sounding Capability is limited.
The technical solution of the present invention is: a kind of near infrared band is suitable for coherent wind laser radar relay optical system
System, including the first single-mode polarization maintaining fiber, the first optical fiber collimator, λ/2 wave plate, the first polarization beam splitter prism, first expands
Mirror, the 2nd λ/2 wave plate, the second polarization beam splitter prism, λ/4 wave plate, the 3rd λ/2 wave plate, the second optical fiber collimator, the second expansion
Shu Jing, the 4th λ/2 wave plate, the 3rd optical fiber collimator, the second single-mode polarization maintaining fiber, the 3rd 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 protect polarisation
Fibre, the 7th single-mode polarization maintaining fiber, a 2X2 fiber optic splitter, the 2nd 2X2 fiber optic splitter, 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；
The pulsed laser signal sent by outside laser transmitting system transmits through the first single-mode polarization maintaining fiber, enters 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
Crossing λ/2 wave plate, be divided into two-way after being transferred to the first polarization beam splitter prism, wherein a road is that the first polarization beam splitter prism is saturating
The laser signal penetrated, is transferred to after the first beam expanding lens expands, and through the 2nd λ/2 wave plate, then it is inclined to be transferred to the second polarization beam apparatus
Shake beam splitter prism, is launched by optical antenna after λ/4 wave plate, forms the first output signal, the first output signal
For coherent wind laser radar pulse signal, for colliding with the aerosol of distribution in air, there is Mie scattering, produce
Include wind speed Doppler frequency shift laser echo signal；Another road is the laser signal of the first polarization beam splitter prism reflection, passes through
3rd λ/2 wave plate, 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, is used for and continuous local oscillator laser signal generation signal
Interfere, produce follow-up reference intermediate-freuqncy signal；
The continuous laser signal sent by outside laser transmitting system is divided into two with splitting ratio for 90:10 by fiber optic splitter
Bundle, the respectively second input signal and the 3rd input signal；Wherein the continuous laser of 90% is sent into the second single-mode polarization maintaining fiber,
Again after the first adjustable optic fibre attenuator, enter the 4th single-mode polarization maintaining fiber, the outfan of the 4th single-mode polarization maintaining fiber together with
After the outfan of the 6th single-mode polarization maintaining fiber together enters a 2X2 fiber optic splitter, respectively by the 8th single-mode polarization maintaining fiber and
9th single-mode polarization maintaining fiber output two paths of signals, this two paths of signals is as the reference intermediate frequency in follow-up balanced type Photodetection system
Light input signal；The continuous laser of 10% delivers to the 3rd single-mode polarization maintaining fiber, then after the second adjustable optic fibre attenuator decay,
Enter the 5th single-mode polarization maintaining fiber；
By optical antenna receive containing wind speed Doppler frequency shift laser echo signal through λ/4 wave plate, pass through
Second polarization beam splitter prism is transmitted to inverted second beam expanding lens, carries out spot diameter by entering the laser beam injecting the second beam expanding lens
Contracting bundle, contracting Shu Houjing crosses the 4th λ/2 wave plate and is transferred to the 3rd optical fiber collimator, is then coupled into the 7th single mode fiber collimator；
The outfan of the 7th single mode fiber collimator enters together with outfan entrance the 2nd 2X2 fiber optic splitter of the 5th single-mode polarization maintaining fiber
Row closes bundle, is exported by the tenth single-mode polarization maintaining fiber and the 11st single-mode polarization maintaining fiber respectively, and this two paths of signals is as follow-up balance
The intermediate frequency light input signal that wind speed in formula Photodetection system extracts.
Being exchanged by the placement location of the first beam expanding lens, the 2nd λ/2 wave plate, other element keeps constant.
Being exchanged in second beam expanding lens, the 4th wave plate position, λ/2, other element keeps constant.
First beam expanding lens, the 2nd λ/2 wave plate placement location are exchanged, simultaneously by the second beam expanding lens, the 4th λ/2 wave plate
Position is exchanged, and other element keeps constant.
The present invention compared with prior art provides the benefit that:
(1) present invention proposes this laser relay optical system scheme, and the program can be suitably used for the relevant survey of near infrared band
In wind laser radar system, versatility is strong with technology transplant；
(2) present invention uses polarizing beam splitter mirror, λ/2, λ/4, polarization beam splitter prism, beam expanding lens integrated with elements such as beam-shrinked mirrors
Relay optical system, coherent detection during heterodyne efficiency is greatly improved, reduce laser firing signals loss；
(3) present invention places polarization beam splitter prism in laser firing pulses signal propagation path, it is achieved laser signal
Separating, after this signal and continuous local oscillator laser signal carry out heterodyne beat, the current intermediate frequency signal formed is follow-up intermediate frequency wind
Field signal gathers and processes.
Accompanying drawing explanation
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.
Detailed description of the invention
Below in conjunction with the accompanying drawings the detailed description of the invention of the present invention is further described in detail.
A kind of near infrared band is suitable for coherent wind laser radar relay optical system, including the first single-mode polarization maintaining fiber 1,
First optical fiber collimator the 2, the oneth λ/2 wave plate the 3, first polarization beam splitter prism the 4, first beam expanding lens the 5, the 2nd λ/2 wave plate 6, second
Polarization beam splitter prism the 7, the oneth λ/4 wave plate the 8, the 3rd λ/2 wave plate the 9, second optical fiber collimator the 10, second beam expanding lens the 11, the 4th λ/2
Wave plate the 12, the 3rd optical fiber collimator the 13, second single-mode polarization maintaining fiber the 14, the 3rd single-mode polarization maintaining fiber the 15, first adjustable optic fibre declines
Subtract device the 16, second adjustable optic fibre attenuator the 17, the 4th single-mode polarization maintaining fiber the 18, the 5th single-mode polarization maintaining fiber the 19, the 6th single mode to protect
Polarisation fibre the 20, the 7th single-mode polarization maintaining fiber the 21, the oneth 2X2 fiber optic splitter the 22, the 2nd 2X2 fiber optic splitter the 23, the 8th single mode
Polarization maintaining optical fibre the 24, the 9th single-mode polarization maintaining fiber the 25, the tenth single-mode polarization maintaining fiber the 26, the 11st single-mode polarization maintaining fiber 27.
The the first input pulse laser signal sent by laser transmitting system transmits through the first single-mode polarization maintaining fiber 1, enters
Entering 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, through λ/2 wave plate 3, is divided into two-way after being transferred to the first polarization beam splitter prism 4, and wherein a road is that the first polarization divides
The laser signal of beam prism 4 transmission, is transferred to after the first beam expanding lens 5 expands, and through the 2nd λ/2 wave plate 6, then it is inclined to be transferred to second
Shake beam splitter polarization beam splitter prism 7, is launched by optical antenna after λ/4 wave plate 8, forms the first output signal,
First output signal is coherent wind laser radar pulse signal, and the purposes of this signal is to carry out with the aerosol of distribution in air
, there is Mie scattering in collision, produces and include wind speed Doppler frequency shift laser echo signal；Another road is the first polarization beam splitting rib
The laser signal of mirror 4 reflection, through the 3rd λ/2 wave plate 9, and is coupled into the 6th single mode guarantor's polarisation by the second optical fiber collimator 10
Fine 20, form the second output signal, the second output signal is coherent wind laser radar reference local oscillator pulsed laser signal, this letter
Number purposes be and continuous local oscillator laser signal generation signal interference to produce follow-up reference intermediate-freuqncy signal.
The continuous laser signal sent by laser transmitting system is divided into two bundles with splitting ratio for 90:10 by fiber optic splitter,
It is respectively the second input signal and the 3rd input signal；Wherein the continuous laser of 90% enters the second single-mode polarization maintaining fiber 14, warp
After crossing the first adjustable optic fibre attenuator 16, entering the 4th single-mode polarization maintaining fiber 18, the outfan of the 4th single-mode polarization maintaining fiber 18 is even
Enter after the first optical-fiber bundling/beam splitter 22 carries out with the outfan of the 6th single-mode polarization maintaining fiber 20, protected by the 8th single mode respectively
Polarisation fine 24 and the 9th single-mode polarization maintaining fiber 25 export two paths of signals, and this two paths of signals is as in coherent wind laser radar system
Reference intermediate frequency light input signal in balanced type Photodetection system；The continuous laser of 10% enters the 3rd single-mode polarization maintaining fiber
15, then after the second adjustable optic fibre attenuator 17 decay, enter the 5th single-mode polarization maintaining fiber 19.
By optical antenna receive containing wind speed Doppler frequency shift laser echo signal through λ/4 wave plate 8, pass through
It is to be entered by the laser beam entering to inject this element that second polarization beam splitter prism 7 is transmitted to inverted second its function of beam expanding lens 11
Row spot diameter contracting bundle, contracting Shu Houjing crosses the 4th λ/2 wave plate 12 and is transferred to the 3rd optical fiber collimator 13, is then coupled into the 7th single
Mode fiber collimator 21, this signal is the 4th input signal；The outfan of the 7th single mode fiber collimator 21 is together with the 5th single mode
The outfan of polarization maintaining optical fibre 19 enters the 2nd 2X2 fiber optic splitter 23 to carry out closing bundle, respectively by the tenth single-mode polarization maintaining fiber 26 He
11st single-mode polarization maintaining fiber 27 exports, and forms this two paths of signals as balanced type light electrical resistivity survey in coherent wind laser radar system
The intermediate frequency light input signal that wind speed in examining system extracts.
Embodiment two: present embodiment is as in figure 2 it is shown, the first input pulse laser sent by laser transmitting system is believed
Number transmitting through the first single-mode polarization maintaining fiber 1, enter the first optical fiber collimator 2 and carry out beam-expanding collimation, propagation medium is via optical fiber
Space is transformed into free space；Laser after beam-expanding collimation is through λ/2 wave plate 3, after being transferred to the first polarization beam splitter prism 4
Being divided into two-way, wherein a road is the laser signal of the first polarization beam splitter prism 4 transmission, is transferred to the 2nd λ/2 wave plate 6, passes through
After first beam expanding lens 5 expands, then it is transferred to the second polarization beam apparatus polarization beam splitter prism 7, by light after λ/4 wave plate 8
Antenna is launched, and forms the first output signal, and the first output signal is coherent wind laser radar pulse signal, this signal
Purposes be with air in distribution aerosol collide, occur Mie scattering, produce include wind speed Doppler frequency shift swash
Optical echo signal；Another road is the laser signal of the first polarization beam splitter prism 4 reflection, through the 3rd λ/2 wave plate 9, 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 for relevant
Wind laser radar reference local oscillator pulsed laser signal, the purposes of this signal is and continuous local oscillator laser signal generation signal interference,
Produce follow-up reference intermediate-freuqncy signal.
The continuous laser signal sent by laser transmitting system is divided into two bundles with splitting ratio for 90:10 by fiber optic splitter,
It is respectively the second input signal and the 3rd input signal；Wherein the continuous laser of 90% enters the second single-mode polarization maintaining fiber 14, warp
After crossing the first adjustable optic fibre attenuator 16, entering the 4th single-mode polarization maintaining fiber 18, the outfan of the 4th single-mode polarization maintaining fiber 18 is even
Enter after the first optical-fiber bundling/beam splitter 22 carries out with the outfan of the 6th single-mode polarization maintaining fiber 20, protected by the 8th single mode respectively
Polarisation fine 24 and the 9th single-mode polarization maintaining fiber 25 export two paths of signals, and this two paths of signals is as in coherent wind laser radar system
Reference intermediate frequency light input signal in balanced type Photodetection system；The continuous laser of 10% enters the 3rd single-mode polarization maintaining fiber
15, then after the second adjustable optic fibre attenuator 17 decay, enter the 5th single-mode polarization maintaining fiber 19.
By optical antenna receive containing wind speed Doppler frequency shift laser echo signal through λ/4 wave plate 8, pass through
It is to be entered by the laser beam entering to inject this element that second polarization beam splitter prism 7 is transmitted to inverted second its function of beam expanding lens 11
Row spot diameter contracting bundle, contracting Shu Houjing crosses the 4th λ/2 wave plate 12 and is transferred to the 3rd optical fiber collimator 13, is then coupled into the 7th single
Mode fiber collimator 21, this signal is the 4th input signal；The outfan of the 7th single mode fiber collimator 21 is together with the 5th single mode
The outfan of polarization maintaining optical fibre 19 enters the 2nd 2X2 fiber optic splitter 23 to carry out closing bundle, respectively by the tenth single-mode polarization maintaining fiber 26 He
11st single-mode polarization maintaining fiber 27 exports, and forms this two paths of signals as balanced type light electrical resistivity survey in coherent wind laser radar system
The intermediate frequency light input signal that wind speed in examining system extracts.
Embodiment three: present embodiment is as it is shown on figure 3, the first input pulse laser sent by laser transmitting system is believed
Number transmitting through the first single-mode polarization maintaining fiber 1, enter the first optical fiber collimator 2 and carry out beam-expanding collimation, propagation medium is via optical fiber
Space is transformed into free space；Laser after beam-expanding collimation is through λ/2 wave plate 3, after being transferred to the first polarization beam splitter prism 4
Being divided into two-way, wherein a road is the laser signal of the first polarization beam splitter prism 4 transmission, is transferred to after the first beam expanding lens 5 expands,
Through the 2nd λ/2 wave plate 6, then it is transferred to the second polarization beam apparatus polarization beam splitter prism 7, by optics after λ/4 wave plate 8
Antenna is launched, and forms the first output signal, and the first output signal is coherent wind laser radar pulse signal, this signal
Purposes is to collide with the aerosol of distribution in air, Mie scattering occurs, produces and include wind speed Doppler frequency shift laser
Echo-signal；Another road is the laser signal of the first polarization beam splitter prism 4 reflection, through the 3rd λ/2 wave plate 9, 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 this signal is and continuous local oscillator laser signal generation signal interference, produces
Raw follow-up reference intermediate-freuqncy signal.
The continuous laser signal sent by laser transmitting system is divided into two bundles with splitting ratio for 90:10 by fiber optic splitter,
It is respectively the second input signal and the 3rd input signal；Wherein the continuous laser of 90% enters the second single-mode polarization maintaining fiber 14, warp
After crossing the first adjustable optic fibre attenuator 16, entering the 4th single-mode polarization maintaining fiber 18, the outfan of the 4th single-mode polarization maintaining fiber 18 is even
Enter after the first optical-fiber bundling/beam splitter 22 carries out with the outfan of the 6th single-mode polarization maintaining fiber 20, protected by the 8th single mode respectively
Polarisation fine 24 and the 9th single-mode polarization maintaining fiber 25 export two paths of signals, and this two paths of signals is as in coherent wind laser radar system
Reference intermediate frequency light input signal in balanced type Photodetection system；The continuous laser of 10% enters the 3rd single-mode polarization maintaining fiber
15, then after the second adjustable optic fibre attenuator 17 decay, enter the 5th single-mode polarization maintaining fiber 19.
By optical antenna receive containing wind speed Doppler frequency shift laser echo signal through λ/4 wave plate 8, pass through
Second polarization beam splitter prism 7 is transmitted to the 4th λ/2 wave plate 12, then carries out inverted second beam expanding lens 11, its function be by
Enter to inject the laser beam of this element and carry out spot diameter contracting bundle, the beam transmission after contracting bundle to the 3rd optical fiber collimator 13,
Then being coupled into the 7th single mode fiber collimator 21, this signal is the 4th input signal；7th single mode fiber collimator 21 defeated
Go out to hold the outfan together with the 5th single-mode polarization maintaining fiber 19 to enter the 2nd 2X2 fiber optic splitter 23 to carry out closing bundle, respectively by the tenth
Single-mode polarization maintaining fiber the 26 and the 11st single-mode polarization maintaining fiber 27 exports, and forms this two paths of signals as coherent wind laser radar system
The intermediate frequency light input signal that in system, the wind speed in balanced type Photodetection system extracts.
Embodiment four: as shown in Figure 4, present embodiment is as in figure 2 it is shown, sent by laser transmitting system for present embodiment
The first input pulse laser signal transmit through the first single-mode polarization maintaining fiber 1, enter the first optical fiber collimator 2 and carry out expanding standard
Directly, propagation medium is transformed into free space via optical fiber space；Laser after beam-expanding collimation, through λ/2 wave plate 3, is transferred to
Being divided into two-way after first polarization beam splitter prism 4, wherein a road is the laser signal of the first polarization beam splitter prism 4 transmission, transmission
To the 2nd λ/2 wave plate 6, after the first beam expanding lens 5 expands, then it is transferred to the second polarization beam apparatus polarization beam splitter prism 7, passes through
Being launched by optical antenna after oneth λ/4 wave plate 8, form the first output signal, the first output signal is coherent wind laser
Radar pulse signal, the purposes of this signal is to collide with the aerosol of distribution in air, and Mie scattering occurs, and generation comprises
There is wind speed Doppler frequency shift laser echo signal；Another road is the laser signal of the first polarization beam splitter prism 4 reflection, through the 3rd
λ/2 wave plate 9, 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 this signal is to believe with continuous local oscillator laser
Number occur signal interference, produce follow-up reference intermediate-freuqncy signal.
The continuous laser signal sent by laser transmitting system is divided into two bundles with splitting ratio for 90:10 by fiber optic splitter,
It is respectively the second input signal and the 3rd input signal；Wherein the continuous laser of 90% enters the second single-mode polarization maintaining fiber 14, warp
After crossing the first adjustable optic fibre attenuator 16, entering the 4th single-mode polarization maintaining fiber 18, the outfan of the 4th single-mode polarization maintaining fiber 18 is even
Enter after the first optical-fiber bundling/beam splitter 22 carries out with the outfan of the 6th single-mode polarization maintaining fiber 20, protected by the 8th single mode respectively
Polarisation fine 24 and the 9th single-mode polarization maintaining fiber 25 export two paths of signals, and this two paths of signals is as in coherent wind laser radar system
Reference intermediate frequency light input signal in balanced type Photodetection system；The continuous laser of 10% enters the 3rd single-mode polarization maintaining fiber
15, then after the second adjustable optic fibre attenuator 17 decay, enter the 5th single-mode polarization maintaining fiber 19.
By optical antenna receive containing wind speed Doppler frequency shift laser echo signal through λ/4 wave plate 8, pass through
Second polarization beam splitter prism 7 is transmitted to the 4th λ/2 wave plate 12, then carries out inverted second beam expanding lens 11, its function be by
Enter to inject the laser beam of this element and carry out spot diameter contracting bundle, the beam transmission after contracting bundle to the 3rd optical fiber collimator 13,
Then being coupled into the 7th single mode fiber collimator 21, this signal is the 4th input signal；7th single mode fiber collimator 21 defeated
Go out to hold the outfan together with the 5th single-mode polarization maintaining fiber 19 to enter the 2nd 2X2 fiber optic splitter 23 to carry out closing bundle, respectively by the tenth
Single-mode polarization maintaining fiber the 26 and the 11st single-mode polarization maintaining fiber 27 exports, and forms this two paths of signals as coherent wind laser radar system
The intermediate frequency light input signal that in system, the wind speed in balanced type Photodetection system extracts.
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 near infrared band is suitable for coherent wind laser radar relay optical system, it is characterised in that: include the first single mode
Polarization maintaining optical fibre (1), the first optical fiber collimator (2), λ/2 wave plate (3), the first polarization beam splitter prism (4), the first beam expanding lens
(5), the 2nd λ/2 wave plate (6), the second polarization beam splitter prism (7), λ/4 wave plate (8), the 3rd λ/2 wave plate (9), the second optical fiber
Collimator (10), the second beam expanding lens (11), the 4th λ/2 wave plate (12), the 3rd optical fiber collimator (13), the second single-mode polarization maintaining fiber
(14), the 3rd 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), a 2X2 fiber optic splitter (22), the 2nd 2X2 fiber optic splitter (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)；
The pulsed laser signal sent by outside laser transmitting system transmits through the first single-mode polarization maintaining fiber (1), enters 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
Through λ/2 wave plate (3), being divided into two-way after being transferred to the first polarization beam splitter prism (4), wherein a road is that the first polarization divides
The laser signal of beam prism (4) transmission, is transferred to after the first beam expanding lens (5) expands, through the 2nd λ/2 wave plate (6), then be transferred to
Second polarization beam apparatus polarization beam splitter prism (7), is launched by optical antenna after λ/4 wave plate (8), forms first
Output signal, the first output signal is coherent wind laser radar pulse signal, for carrying out with the aerosol of distribution in air
, there is Mie scattering in collision, produces and include wind speed Doppler frequency shift laser echo signal；Another road is the first polarization beam splitting rib
The laser signal that mirror (4) reflects, through the 3rd λ/2 wave plate (9), 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, is used for and continuous local oscillator laser signal generation signal interference, produces follow-up reference intermediate-freuqncy signal；
The continuous laser signal sent by outside laser transmitting system is divided into two bundles with splitting ratio for 90:10 by fiber optic splitter,
It is respectively the second input signal and the 3rd input signal；Wherein the continuous laser of 90% is sent into the second single-mode polarization maintaining fiber
(14), then after the first adjustable optic fibre attenuator (16), the 4th single-mode polarization maintaining fiber (18), the 4th single-mode polarization maintaining fiber are entered
(18) after outfan together enters a 2X2 fiber optic splitter (22) together with the outfan of the 6th single-mode polarization maintaining fiber (20),
Being exported two paths of signals by the 8th single-mode polarization maintaining fiber (24) and the 9th single-mode polarization maintaining fiber (25) respectively, this two paths of signals is as rear
Reference intermediate frequency light input signal in continuous balanced type Photodetection system；The continuous laser of 10% delivers to the 3rd single-mode polarization maintaining fiber
(15), then after the second adjustable optic fibre attenuator (17) decay, the 5th single-mode polarization maintaining fiber (19) is entered；
By optical antenna receive containing wind speed Doppler frequency shift laser echo signal through λ/4 wave plate (8), by
Two polarization beam splitter prisms (7) are transmitted to inverted second beam expanding lens (11), are entered by the laser beam entering to inject the second beam expanding lens (11)
Row spot diameter contracting bundle, contracting Shu Houjing crosses the 4th λ/2 wave plate (12) and is transferred to the 3rd optical fiber collimator (13), is then coupled into the
Seven single mode fiber collimators (21)；The outfan of the 7th single mode fiber collimator (21) is together with the 5th single-mode polarization maintaining fiber (19)
Outfan enters the 2nd 2X2 fiber optic splitter (23) and carries out closing bundle, single by the tenth single-mode polarization maintaining fiber (26) and the 11st respectively
Mould polarization maintaining optical fibre (27) exports, and the intermediate frequency light that this two paths of signals extracts as the wind speed in follow-up balanced type Photodetection system is defeated
Enter signal.
A kind of near infrared band the most according to claim 1 is suitable for coherent wind laser radar relay optical system, and it is special
Levying and be: exchanged by the placement location of the first beam expanding lens (5), the 2nd λ/2 wave plate (6), other element keeps constant.
A kind of near infrared band the most according to claim 1 is suitable for coherent wind laser radar relay optical system, and it is special
Levying and be: exchanged in the second beam expanding lens (11), the 4th λ/2 wave plate (12) position, other element keeps constant.
A kind of near infrared band the most according to claim 1 is suitable for coherent wind laser radar relay optical system, and it is special
Levy and be: the first beam expanding lens (5), the 2nd λ/2 wave plate (6) placement location are exchanged, simultaneously by the second beam expanding lens (11),
Four λ/2 wave plate (12) positions are exchanged, and other element keeps constant.
Priority Applications (1)
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| CN107045130A (en) * | 2017-03-07 | 2017-08-15 | 北京理工大学 | A kind of Portable type full-automatic micropulse anemometry laser radar system |
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| CN106291508B (en) | 2018-07-03 |
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