CN109959944A - Anemometry laser radar based on wide spectrum light source - Google Patents
Anemometry laser radar based on wide spectrum light source Download PDFInfo
- Publication number
- CN109959944A CN109959944A CN201910256086.7A CN201910256086A CN109959944A CN 109959944 A CN109959944 A CN 109959944A CN 201910256086 A CN201910256086 A CN 201910256086A CN 109959944 A CN109959944 A CN 109959944A
- Authority
- CN
- China
- Prior art keywords
- laser
- filter
- signal
- unit
- seed laser
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- 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
-
- 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
-
- 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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
- G01S7/481—Constructional features, e.g. arrangements of optical elements
- G01S7/4814—Constructional features, e.g. arrangements of optical elements of transmitters alone
-
- 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
- G01S7/4816—Constructional features, e.g. arrangements of optical elements of receivers alone
-
- 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
- G01S7/4818—Constructional features, e.g. arrangements of optical elements using optical fibres
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Computer Networks & Wireless Communication (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Electromagnetism (AREA)
- Multimedia (AREA)
- Aviation & Aerospace Engineering (AREA)
- Optical Radar Systems And Details Thereof (AREA)
Abstract
The invention discloses a kind of anemometry laser radars based on wide spectrum light source.The invention is gated using photoswitch, makes to emit laser and Received Signal shares a filter, realize the direct detection Doppler lidar for wind measurement based on wide spectrum light source.The invention proposes to move to the frequency for emitting laser on the edge of filter using frequency shifter.When Doppler frequency shift occurs for Received Signal, Received Signal will be caused through the Strength Changes of transmission signal and reflection signal on filter, an enhancing, one reduces, and atmosphere wind speed passes through this Strength Changes information extraction.Since transmitting laser and Received Signal pass through filter in the millisecond even time of musec order, the present invention has following advantage, firstly, the anemometry laser radar is insensitive to the frequency drift of laser and filter；Secondly, being not required to using narrow-linewidth single frequency laser, shoot laser power is can be improved in wide spectrum light source, reduces laser cost；Finally, simplifying optical path without necessarily referring to laser.
Description
Technical field
The present invention relates to laser radar fields more particularly to a kind of direct detection based on wide spectrum light source to survey wind laser thunder
It reaches.
Background technique
In atmosphere wind speed remote sensing, anemometry laser radar is answered extensively due to having the characteristics that high-precision, high-spatial and temporal resolution
For fields such as the detection of atmosphere Wind outline, wind shear early warning, aircraft wake detection, wind power generation, aerospace and military affairs.
Anemometry laser radar can be divided into two class of direct detection and coherent detection.Currently, the survey wind laser thunder of both mechanism
The light source reached is all made of the laser for requiring harsh narrow linewidth.Coherent laser radar improves relevant length by using narrow linewidth
Degree, to improve relevant efficiency, spectrum is wider, and the efficiency that is concerned with is poorer.And in direct detection Doppler lidar for wind measurement, by using
Narrow-linewidth laser is locked on the sharp edge of filter, and faint Doppler frequency shift will cause the big variation through intensity,
To extract wind speed information, laser spectrum is narrower, and detectivity is higher.In practical applications, due to laser and filter it
Between drift, need laser frequency to be locked on filter using reference light.This just brings following problem, first
First, when ambient temperature and big pressure change, laser and the big frequency drift of filter will be caused, this aspect increases lock
Fixed difficulty, also proposes better requirement to the stability of system, and still further aspect introduces systematic error；Secondly, in light
In fibre laser, line width is narrower, and stimulated Brillouin scattering effect is stronger, to limit the output power of laser, increases
The cost of laser.
Summary of the invention
On the one hand the disclosure provides a kind of anemometry laser radar based on wide spectrum light source, comprising: seed laser pulse produces
Raw unit, for generating seed laser pulse；Filter unit, including filter, the filter are used to swash the seed of generation
Light pulse is filtered；Laser frequency displacement and amplifying unit, for receiving via the filtering seed after the filtering unit filters
Laser pulse, and frequency displacement and amplification are carried out to the seed laser pulse that filtered；Laser emission and receiving unit, for receiving
Via the laser of the laser frequency displacement and amplifying unit frequency displacement and amplified frequency displacement and amplification, and by the frequency displacement and put
Big Laser emission is into atmosphere；The Laser emission and receiving unit are also used to receive the frequency displacement and amplification seed laser
The Received Signal generated after pulse and atmospheric interaction；Wherein, received via the Laser emission and receiving unit
After the Received Signal is via the filter filtering, transmission signal and reflection signal, the two signals pair are respectively obtained
Atmosphere Doppler frequency shift is sensitive, and the Strength Changes by measuring the transmission signal and reflection signal can inverting acquisition atmosphere wind speed
Information.
Optionally, the above-mentioned anemometry laser radar based on wide spectrum light source, further includes: echo-signal probe unit, for visiting
Survey the transmission signal and the reflection signal；Signal sampling and processing unit is visited for acquiring by echo-signal probe unit
The transmission signal and the reflection signal measured, and the Strength Changes of the transmission signal and the reflection signal are measured,
Inverting obtains atmosphere wind speed information.
Optionally, the above-mentioned anemometry laser radar based on wide spectrum light source, wherein the filter unit further include: first
Photoswitch and the second photoswitch make the seed laser by the gated fashion of first photoswitch and second photoswitch
The filter is passed through in pulse and the Received Signal timesharing, wherein first photoswitch and the seed laser arteries and veins
Punching generates unit connection, second photoswitch and the laser frequency displacement and amplifying unit and the echo-signal probe unit
Connection.
Optionally, the above-mentioned anemometry laser radar based on wide spectrum light source, wherein the seed laser pulse is by described the
After first optical channel of one photoswitch, it is incident on the filter, the filter is filtered the seed laser pulse,
Seed laser pulse, first light for having filtered seed laser pulse and being incident on second photoswitch have been filtered described in obtaining
Channel, and then it is input to laser frequency displacement and amplifying unit.
Optionally, above-mentioned filter unit further include: circulator, the circulator and the Laser emission and receiving unit with
And echo-signal probe unit connection, wherein institute is passed through by the Laser emission and the received Received Signal of receiving unit
After stating circulator, enter the filter by the second optical channel of first photoswitch, after the filter filtering,
Respectively obtain transmission signal and reflection signal；The transmission signal enters after the second optical channel of second photoswitch
The echo-signal probe unit；The reflection signal after the second optical channel of first photoswitch, the circulator,
Into the echo-signal probe unit.
Optionally, it includes: seed laser that above-mentioned seed laser pulse, which generates unit, for generating seed laser；Pulse
Generator is connect with the seed laser, for receiving the seed laser, and is generated pulse based on the seed laser and is swashed
Light；First filter is connect with the impulse generator, and is filtered to form the seed laser arteries and veins to the pulse laser
Punching.
Optionally, above-mentioned filter includes second filter and third filter, the second filter and the third
Filter connection.
Optionally, above-mentioned laser frequency displacement and amplifying unit include: laser frequency shifter, connect, are used for the filter unit
The filtering seed laser pulse from the filter unit is received, and frequency displacement is carried out to the seed laser pulse that filtered；
Time delay optical fiber is connect with the laser frequency shifter, for receiving the frequency displacement seed laser pulse from laser frequency shifter, and it is right
Frequency displacement seed laser pulse is delayed, so that the Received Signal be made to divide in the time domain with the seed laser pulse
It opens；Fiber amplifier is connect with the time delay optical fiber and the Laser emission and receiving unit, for receiving from delay light
Fine delay seed laser pulse, and the seed laser pulse that has been delayed is amplified to obtain the frequency displacement and amplification seed
Laser pulse, and will the frequency displacement and the amplification seed laser pulse input Laser emission and receiving unit.
Optionally, above-mentioned Signal sampling and processing unit includes: capture card, is visited for acquiring by echo-signal probe unit
The transmission signal and the reflection signal measured；Processor, the transmission signal that measurement is acquired by the capture card and
The Strength Changes of the reflection signal, inverting obtain atmosphere wind speed information.
Optionally, above-mentioned Laser emission and receiving unit include: transmitter-telescope, for will from the laser frequency displacement and
The frequency displacement of amplifying unit and amplification seed laser pulse emit into atmosphere；Receiving telescope, it is next arrogant for receiving
The Received Signal of gas, and the Received Signal is inputted into the filter unit.
The direct detection Doppler lidar for wind measurement that the disclosure proposes reaches echo-signal by the way of photoswitch gating
Seed laser pulse has been locked in half eminence of filter, to realize atmosphere by laser frequency shifter frequency displacement by wide spectrum light source
The detection of wind field.The anemometry laser radar that the disclosure proposes has system stability high, without necessarily referring to light, trembles to laser frequency
Move insensitive, the high-power feature of wide range laser emitting.
Detailed description of the invention
It, below will be to required use in embodiment description in order to illustrate more clearly of the technical solution of the embodiment of the present disclosure
Attached drawing be briefly described, it should be apparent that, the accompanying drawings in the following description is only embodiment of the disclosure, for this field
Those of ordinary skill for, without creative efforts, can also be obtained according to these attached drawings other accompanying drawings.
In order to which the disclosure and its advantage is more fully understood, referring now to being described below in conjunction with attached drawing, in which:
Fig. 1 diagrammatically illustrates the light path schematic diagram of the laser radar according to the embodiment of the present disclosure；
Fig. 2 diagrammatically illustrates the working timing figure of the laser radar according to the embodiment of the present disclosure；And
Fig. 3, which is diagrammatically illustrated, surveys wind schematic illustration according to the direct detection of the laser radar of the embodiment of the present disclosure.
Specific embodiment
Hereinafter, will be described with reference to the accompanying drawings embodiment of the disclosure.However, it should be understood that these descriptions are only exemplary
, and it is not intended to limit the scope of the present disclosure.In addition, in the following description, descriptions of well-known structures and technologies are omitted, with
Avoid unnecessarily obscuring the concept of the disclosure.
Term as used herein is not intended to limit the disclosure just for the sake of description specific embodiment.It uses herein
The terms "include", "comprise" etc. show the presence of the feature, step, operation and/or component, but it is not excluded that in the presence of
Or add other one or more features, step, operation or component.
There are all terms (including technical and scientific term) as used herein those skilled in the art to be generally understood
Meaning, unless otherwise defined.It should be noted that term used herein should be interpreted that with consistent with the context of this specification
Meaning, without that should be explained with idealization or excessively mechanical mode.
It, in general should be according to this using statement as " at least one in A, B and C etc. " is similar to
Field technical staff is generally understood the meaning of the statement to make an explanation (for example, " system at least one in A, B and C "
Should include but is not limited to individually with A, individually with B, individually with C, with A and B, with A and C, have B and C, and/or
System etc. with A, B, C).Using statement as " at least one in A, B or C etc. " is similar to, generally come
Saying be generally understood the meaning of the statement according to those skilled in the art to make an explanation (for example, " having in A, B or C at least
One system " should include but is not limited to individually with A, individually with B, individually with C, with A and B, have A and C, have
B and C, and/or the system with A, B, C etc.).
Below with reference to the attached drawing in the embodiment of the present disclosure, the technical solution in the embodiment of the present disclosure is carried out clear, complete
Ground description, it is clear that the described embodiment is only a part of the embodiment of the present invention, instead of all the embodiments.Based on this hair
Bright embodiment, every other implementation obtained by those of ordinary skill in the art without making creative efforts
Example, belongs to the protection scope of the disclosure.
Fig. 1 diagrammatically illustrates the light path schematic diagram of the laser radar according to the embodiment of the present disclosure.
As shown in Figure 1, the laser radar of the embodiment of the present disclosure, especially a kind of direct detection based on wide spectrum light source surveys wind
Laser radar, including seed laser pulse generate unit 10, filter unit 20, laser frequency displacement and amplifying unit 30, Laser emission
With receiving unit 40, echo-signal probe unit 50 and Signal sampling and processing unit 60.
According to the embodiment of the present disclosure, seed laser pulse generates unit 10 for generating seed laser pulse.Alternatively, seed
Laser pulse generates unit 10 and is also possible to that other lasers of wide range laser pulse can be generated.
According to the embodiment of the present disclosure, seed laser pulse generates unit 10 for example including seed laser 11, pulse generation
Device 12 and first filter 13.Wherein, seed laser 11 swashs for example including continuous wide range seed laser for generating seed
Light.Impulse generator 12 is connect with seed laser 11, for receiving seed laser, and is generated pulse based on seed laser and is swashed
Light.First filter 13 is connect with impulse generator 12, and is filtered to form seed laser pulse to pulse laser, the seed
Laser pulse is incident to filter unit 20.
Specifically, seed laser 11 first passes around impulse generator 12 and forms pulsed light, then through first filter 13
Spectrum of the interception for detection.The central wavelength of preferred laser is 1.5 microns.
According to the embodiment of the present disclosure, filter unit 20 includes filter 21, and filter 21 is used for the seed laser to generation
Pulse is filtered.
According to the embodiment of the present disclosure, filter unit 20 further include: the first photoswitch 24 and the second photoswitch 25 pass through first
The gated fashion of photoswitch 24 and the second photoswitch 25 makes seed laser pulse and Received Signal timesharing through wave filter 21,
Wherein, the first photoswitch 24 generates unit 10 with seed laser pulse and connect, and the second photoswitch 25 and laser frequency displacement and amplification are single
Member 30 and echo-signal probe unit 50 connect.
According to the embodiment of the present disclosure, seed laser pulse is incident on filter after the first optical channel of the first photoswitch 24
Wave device 21, filter 21 are filtered seed laser pulse, have been filtered seed laser pulse, have filtered seed laser arteries and veins
The first optical channel for being mapped to the second photoswitch 25 is poured, and then is input to laser frequency displacement and amplifying unit 30.
In the embodiments of the present disclosure, filter 21 includes second filter 22 and third filter 23, second filter 22
It is connected with third filter 23.
Specifically, first optical channel (for example, first photoswitch 24 of the seed laser pulse for example through the first photoswitch 24
The channel 1-2) after, into second filter 22, using the first optical channel (example of third filter 23 and the second photoswitch 25
The for example channel 1-2 of the second photoswitch 25).Wherein, the first photoswitch 24 and the second photoswitch 25 are for gating seed laser arteries and veins
Punching and Received Signal.Second filter 22 filters out sun background and sky for being filtered to atmospheric echo information
Background radiation.Third filter 23, which is used to be used as, filters out seed laser pulse, and as the edge filter of atmospheric wind detection
Device.
According to the embodiment of the present disclosure, laser frequency displacement and amplifying unit 30 are filtered via filter unit 20 for receiving
Laser, and frequency displacement and amplification are carried out to laser has been filtered.Wherein, laser frequency displacement and amplifying unit 30 include: laser frequency shifter 31,
Time delay optical fiber 32, fiber amplifier 33.
Wherein, laser frequency shifter 31 is connect with filter unit 20, for receiving the filtering laser from filter unit 20,
And frequency displacement is carried out to laser has been filtered.Time delay optical fiber 32 is connect with laser frequency shifter 31, comes from laser frequency shifter 31 for receiving
Frequency shift laser, and be delayed to frequency shift laser, to make the Received Signal and the seed laser pulse
It separates in the time domain.Fiber amplifier 33 is connect with time delay optical fiber 32 and Laser emission and receiving unit 40, is come for receiving
From the delay laser of time delay optical fiber 32, and to the laser that has been delayed amplify to obtain frequency displacement and amplification laser, and by frequency
It moves and the laser of amplification inputs Laser emission and receiving unit 40.
Wherein, after first passing through laser frequency shifter 31 by the laser that filter unit 20 is emitted, then successively pass through time delay optical fiber 32
Delay and light amplification are carried out with fiber amplifier 33.Laser frequency shifter 31 is used for will move from laser that filter unit 20 is emitted
To half eminence of 23 transmittance curve of third filter.Time delay optical fiber 32 is for existing shoot laser pulse and Received Signal
It is separated in time domain.
According to the embodiment of the present disclosure, Laser emission and receiving unit 40 are for receiving via laser frequency displacement and amplifying unit 30
Frequency displacement and amplified frequency displacement and amplification laser, and by the Laser emission of frequency displacement and amplification into atmosphere, Laser emission and
Receiving unit 40 is also used to receive the Received Signal generated after the laser and atmospheric interaction of frequency displacement and amplification.
Wherein, after being filtered via Laser emission and the received Received Signal of receiving unit 40 via filter 21, point
Transmission signal and reflection signal are not obtained, the two signals are sensitive to atmosphere Doppler frequency shift, by measurement transmission signal and instead
The Strength Changes for penetrating signal can inverting acquisition atmosphere wind speed information.
Specifically, Laser emission and receiving unit 40 include: transmitter-telescope 41 and receiving telescope 42.Transmitter-telescope
41 frequency displacement and amplification Laser emission for self-excitation in future optical frequency shift and amplifying unit 30 is into atmosphere.Receiving telescope 42 is used
In receiving the Received Signal from atmosphere, and by Received Signal input filter unit 20.
According to the embodiment of the present disclosure, Laser emission and receiving unit 40 are by the emitted telescope 41 of amplified laser pulse
It is emitted in atmosphere, the Received Signal that laser pulse is generated with atmospheric interaction is received by receiving telescope 42.Such as Fig. 1
Shown, it may be transmitting-receiving that it is preferred embodiment that Laser emission and Received Signal, which are received as transmitting-receiving separate structure,
Coaxial configuration, transmitting and reception share a telescope.
According to the embodiment of the present disclosure, filter unit 20 further include: circulator 26, circulator 26 and Laser emission and reception are single
Member 40 and echo-signal probe unit 50 connect.
Wherein, by Laser emission and the received Received Signal of receiving unit 40 after circulator 26, by first
Second optical channel of photoswitch 24 enters filter 21, after filtering via filter 21, respectively obtains transmission signal and reflection letter
Number, transmission signal, into echo-signal probe unit 50, reflects signal and passes through after the second optical channel of the second photoswitch 25
After second optical channel of the first photoswitch 24, circulator 26, into echo-signal probe unit 50.
For example, Received Signal is after circulator 26, the second optical channel (for example, the first light through the first photoswitch 24
The channel 3-2 of switch 24) enter second filter 22 and third filter 23 afterwards, wherein transmission signal is through the second photoswitch 25
Second optical channel (for example, channel 1-4 of the second photoswitch 25) enters echo-signal probe unit 50.And Received Signal
Reflection signal through third filter 23, the second optical channel successively through second filter 22 and the first photoswitch 24 is (for example,
The channel 2-3 of first photoswitch 24) enter echo-signal probe unit 50 afterwards.
According to the embodiment of the present disclosure, echo-signal probe unit 50 is for detecting transmission signal and reflection signal.
Wherein, echo-signal probe unit Unit 50 is single-photon detector comprising but it is not limited to superconducting nano-wire list
Photon detector, frequency upooaversion single-photon detector and InGaAs (indium gallium arsenic) single-photon detector.
It specifically, may include refrigeration when echo-signal probe unit 50 is superconducting nano-wire single-photon detector
Preparation and superconduction chip 51, electric impulse signal amplifying unit 52 and electric impulse signal discriminator unit 53.Wherein, refrigerated medium is standby and super
Chip 51 is led for single photon signal to be switched to electric impulse signal, electric impulse signal amplifying unit 52 be used for electric impulse signal into
Row amplification, electric impulse signal discriminator unit 53 are used to screen the electric impulse signal more than certain threshold value.
According to the embodiment of the present disclosure, Signal sampling and processing unit 60 is visited for acquiring by echo-signal probe unit 50
The transmission signal and reflection signal measured, and measure transmission signal and reflect the Strength Changes of signal, inverting obtains atmosphere wind speed
Information.
Specifically, Signal sampling and processing unit 60 includes: capture card 61 and processor 62.Capture card 61 for acquire by
The transmission signal and reflection signal that echo-signal probe unit 50 detects.Processor 62 (such as computer) is for measuring by adopting
The signal strength of transmission signal and reflection signal that truck 61 acquires, inverting obtain atmosphere wind speed information.
Fig. 2 diagrammatically illustrates the working timing figure of the laser radar according to the embodiment of the present disclosure.
As shown in Fig. 2, the gating of seed laser pulse and Received Signal is by the first photoswitch 24 and the second photoswitch
25 complete, that is, are incident on atmosphere in the channel 1-2 in the channel 1-2 and the second photoswitch 25 of the pulse laser line through the first photoswitch 24
In, then by adjusting the level of the electric signal of input optical switch, so that the channel 1-2 of the first photoswitch 24 and the second light are opened
The channel 1-2 for closing 25 is closed, and then opens the channel 3-2 of the first photoswitch 24 and the channel 1-4 of the second photoswitch 25, is completed big
The filtering of gas echo-signal.Seed laser pulse frequency is moved to the half of 23 transmittance curve of third filter by laser frequency shifter 31
Eminence.By signal acquisition, transmission signal and reflection signal of the Received Signal through third filter 23 are obtained respectively, is such as schemed
Shown in 2.
Fig. 3, which is diagrammatically illustrated, surveys wind schematic illustration according to the direct detection of the laser radar of the embodiment of the present disclosure.
It is shown in Figure 3, since transmitting laser and echo-signal share a filter, Fabry Perot interferometer
(FPI) spectrum and laser spectrum have same line style, since the line style of Fabry Perot interferometer is lorentzian curve, two
The convolution of Lorentzian is still lorentzian curve, and width is the sum of two Lorentzian width.Therefore Received Signal
Convolution with Fabry Perot interferometer is still lorentzian curve, but width increases one times, and Received Signal is through method
Shown in transmission spectrum and reflectance spectrum such as Fig. 3 (b) of Fabry-Perot interferometer.By using laser frequency shifter (AOM) to transmitting laser
Frequency carries out frequency displacement, such as by half eminence of laser frequency lock curve shown in Fig. 3 (b).
The nucleus module of the disclosure is filter module 20, the side gated by the first photoswitch 24 and the second photoswitch 25
Formula, to realize transmitting laser and Received Signal by same filter 21, to realize wide spectrum light source.It is big in order to extract
The detection of atmospheric wind is realized in the frequency displacement of gas echo-signal, emits laser through 31 frequency displacement of laser frequency shifter to the side of filter 21
Edge, when the frequency of echo-signal changes, by cause Received Signal through on filter 21 transmission signal and reflection
Signal strength changes, an enhancing, another reduction, and atmosphere wind speed information is extracted by this strength information.
The invention discloses a kind of direct detection Doppler lidar for wind measurement based on wide spectrum light source.The invention is opened using two light
The mode for closing gating makes to emit laser and Received Signal shares a filter, realizes the direct spy based on wide spectrum light source
Survey anemometry laser radar.The invention is to improve the sensitivity for surveying wind, proposes to move to filtering for laser frequency is emitted using frequency shifter
On the edge of device.When Received Signal emits Doppler frequency shift, Received Signal will be caused through the transmission on filter
Signal and reflected signal strength change, an enhancing, another reduction, and atmosphere wind speed information passes through this Strength Changes
Information extraction.Since transmitting laser and Received Signal pass through filter in the millisecond even time of musec order,
The present invention has following advantage, firstly, the direct detection Doppler lidar for wind measurement is unwise to the frequency drift of laser and filter
Sense；Secondly, being not required to using narrow-linewidth single frequency laser, transmitting laser power is can be improved in wide spectrum light source, reduces laser cost；Most
Afterwards, without necessarily referring to laser, optical path is simplified.
A kind of direct detection Doppler lidar for wind measurement based on wide spectrum light source that the disclosure proposes has the following beneficial effects:
(1) disclosure uses wide range laser, reduces requirement of the laser radar to laser narrow linewidth, wide range laser can
Laser emitting power is improved, the cost of laser is reduced.
(2) disclosure proposes that transmitting laser and Received Signal share the scheme of a filter, passes through laser frequency displacement
Device will emit half eminence of laser lock-on spectrum after Fabry Perot interferometer and Received Signal convolution, due to transmitting
Laser and Received Signal pass through Fabry Perot interferometer, the method in this time scale within the time of musec order
Fabry-Perot interferometer drift amount is negligible, reduces direct detection Doppler lidar for wind measurement to Fabry Perot interferometer
The requirement of stability.
(3) disclosure proposes that transmitting laser and Received Signal share the scheme of a filter, due to emitting laser
Position relative to Fabry Perot interferometer can be controlled by laser frequency shifter, and therefore, this eliminates traditional direct detection and surveys
The reference light of wind laser radar, simplifies optical path.
It will be understood by those skilled in the art that the feature recorded in each embodiment and/or claim of the disclosure can
To carry out multiple combinations or/or combination, even if such combination or combination are not expressly recited in the disclosure.Particularly, exist
In the case where not departing from disclosure spirit or teaching, the feature recorded in each embodiment and/or claim of the disclosure can
To carry out multiple combinations and/or combination.All these combinations and/or combination each fall within the scope of the present disclosure.
Although the disclosure, art technology has shown and described referring to the certain exemplary embodiments of the disclosure
Personnel it should be understood that in the case where the spirit and scope of the present disclosure limited without departing substantially from the following claims and their equivalents,
A variety of changes in form and details can be carried out to the disclosure.Therefore, the scope of the present disclosure should not necessarily be limited by above-described embodiment,
But should be not only determined by appended claims, also it is defined by the equivalent of appended claims.
Claims (10)
1. a kind of anemometry laser radar based on wide spectrum light source, comprising:
Seed laser pulse generates unit (10), for generating seed laser pulse；
Filter unit (20), including filter (21), the filter (21) is for filtering the seed laser pulse of generation
Wave；
Laser frequency displacement and amplifying unit (30) have filtered seed laser via the filter unit (20) is filtered for receiving
Pulse, and frequency displacement and amplification are carried out to the seed laser pulse that filtered；
Laser emission and receiving unit (40), for receiving via after the laser frequency displacement and amplifying unit (30) frequency displacement and amplification
Frequency displacement and amplification seed laser pulse, and by the frequency displacement and amplification seed laser pulse emit into atmosphere；Institute
It states Laser emission and receiving unit (40) is also used to receive the frequency displacement and amplification seed laser pulse and atmospheric interaction
The Received Signal formed afterwards；
Wherein, via the Laser emission and the received Received Signal of receiving unit (40) via the filter
(21) after filtering, transmission signal and reflection signal are respectively obtained, the two signals are sensitive to atmosphere Doppler frequency shift, pass through measurement
The Strength Changes of the transmission signal and reflection signal can inverting acquisition atmosphere wind speed information.
2. the anemometry laser radar according to claim 1 based on wide spectrum light source, further includes:
Echo-signal probe unit (50), for detecting the transmission signal and the reflection signal；
Signal sampling and processing unit (60), for acquiring the transmission signal detected by echo-signal probe unit (50)
With the reflection signal, and measure the transmission signal and it is described reflection signal Strength Changes, inverting obtain atmosphere wind speed letter
Breath.
3. the anemometry laser radar according to claim 2 based on wide spectrum light source, wherein the filter unit (20) is also wrapped
It includes:
First photoswitch (24) and the second photoswitch (25) pass through first photoswitch (24) and second photoswitch (25)
Gated fashion make the seed laser pulse and the Received Signal timesharing by the filter (21),
Wherein, first photoswitch (24) generates unit (10) with the seed laser pulse and connect, second photoswitch
(25) it is connect with the laser frequency displacement and amplifying unit (30) and the echo-signal probe unit (50).
4. the anemometry laser radar according to claim 3 based on wide spectrum light source, wherein the seed laser pulse passes through
It after first optical channel of first photoswitch (24), is incident on the filter (21), the filter (21) is to described kind
Sub- laser pulse is filtered, obtain it is described filtered seed laser pulse, the seed laser pulse that filtered is incident on institute
The first optical channel of the second photoswitch (25) is stated, and then is input to laser frequency displacement and amplifying unit (30).
5. the anemometry laser radar according to claim 4 based on wide spectrum light source, in which:
The filter unit (20) further include: circulator (26), the circulator (26) and the Laser emission and receiving unit
(40) and echo-signal probe unit (50) connects,
Wherein, by the Laser emission and receiving unit (40) received Received Signal after the circulator (26),
Enter the filter (21) by the second optical channel of first photoswitch (24), is filtered via the filter (21)
Afterwards, transmission signal and reflection signal are respectively obtained；The transmission signal passes through the second optical channel of second photoswitch (25)
Afterwards, into the echo-signal probe unit (50)；The reflection signal is logical by the second light of first photoswitch (24)
After road, the circulator (26), into the echo-signal probe unit (50).
6. the anemometry laser radar according to claim 1 based on wide spectrum light source, wherein the seed laser pulse unit
(10) include:
Seed laser (11), for generating seed laser；
Impulse generator (12) is connect with the seed laser (11), for receiving the seed laser, and is based on described kind
Sub- laser generates pulse laser；
First filter (13) is connect with the impulse generator (12), and the pulse laser is filtered to be formed it is described
Seed laser pulse.
7. the anemometry laser radar according to claim 1 based on wide spectrum light source, wherein the filter (21) includes the
Two filters (22) and third filter (23), the second filter (22) and the third filter (23) connection.
8. the anemometry laser radar according to claim 1 based on wide spectrum light source, wherein the laser frequency displacement and amplification are single
First (30) include:
Laser frequency shifter (31) is connect with the filter unit (20), for receiving the filter from the filter unit (20)
Wave seed laser pulse, and frequency displacement is carried out to the seed laser pulse that filtered；
Time delay optical fiber (32) is connect with the laser frequency shifter (31), for receiving the frequency displacement from laser frequency shifter (31)
Seed laser pulse, and be delayed to frequency displacement seed laser pulse, to make the Received Signal and the seed
Laser pulse separates in the time domain；
Fiber amplifier (33) connect with the time delay optical fiber (32) and the Laser emission and receiving unit (40), is used for
The delay seed laser pulse for coming from time delay optical fiber (32) is received, and the seed laser pulse that has been delayed is amplified to obtain institute
State frequency displacement and amplification seed laser pulse, and will the frequency displacement and amplification seed laser pulse input the Laser emission and
Receiving unit (40).
9. the anemometry laser radar according to claim 2 based on wide spectrum light source, wherein the Signal sampling and processing list
First (60) include:
Capture card (61), for acquiring the transmission signal and reflection letter that are detected by echo-signal probe unit (50)
Number；
The intensity of processor (62), the transmission signal and the reflection signal that measurement is acquired by the capture card (61) becomes
Change, inverting obtains atmosphere wind speed information.
10. the anemometry laser radar according to claim 1 based on wide spectrum light source, wherein the Laser emission and reception
Unit (40) includes:
Transmitter-telescope (41), for from the laser frequency displacement and the frequency displacement of amplifying unit (30) and seed will to be amplified
Laser pulse emission is into atmosphere；
Receiving telescope (42), for receiving the Received Signal from atmosphere, and the Received Signal is defeated
Enter the filter unit (20).
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910256086.7A CN109959944B (en) | 2019-03-29 | 2019-03-29 | Wind lidar based on wide-spectrum light source |
| PCT/CN2019/099781 WO2020199447A1 (en) | 2019-03-29 | 2019-08-08 | Broad-spectrum light source-based wind measurement lidar |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910256086.7A CN109959944B (en) | 2019-03-29 | 2019-03-29 | Wind lidar based on wide-spectrum light source |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109959944A true CN109959944A (en) | 2019-07-02 |
| CN109959944B CN109959944B (en) | 2023-06-16 |
Family
ID=67025421
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910256086.7A Active CN109959944B (en) | 2019-03-29 | 2019-03-29 | Wind lidar based on wide-spectrum light source |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN109959944B (en) |
| WO (1) | WO2020199447A1 (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110764104A (en) * | 2019-11-07 | 2020-02-07 | 浙江缔科新技术发展有限公司 | Light quantum laser sighting telescope with wind measuring function |
| CN111257851A (en) * | 2020-04-03 | 2020-06-09 | 厦门大学 | Spectrum measurement method based on wide-spectrum light source and spectrum scanning laser radar |
| WO2020199447A1 (en) * | 2019-03-29 | 2020-10-08 | 中国科学技术大学 | Broad-spectrum light source-based wind measurement lidar |
| CN113281725A (en) * | 2021-05-13 | 2021-08-20 | 中国科学技术大学 | Laser radar optical transceiving system and feedback adjusting method thereof |
| CN115015966A (en) * | 2022-08-04 | 2022-09-06 | 南京信息工程大学 | Gas detection laser radar based on wide-spectrum light source |
| CN115453574A (en) * | 2022-10-27 | 2022-12-09 | 南京信息工程大学 | Multifunctional laser radar for atmospheric multi-parameter detection |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117031500B (en) * | 2023-05-11 | 2024-02-13 | 珠海光恒科技有限公司 | Light source system and method for long-distance all-fiber laser Doppler wind-finding radar |
| CN117214918B (en) * | 2023-11-09 | 2024-03-29 | 中国科学技术大学 | Rayleigh Doppler temperature measurement wind measurement laser radar |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002131022A (en) * | 2000-10-23 | 2002-05-09 | Oki Electric Ind Co Ltd | Optical fiber sensing system and measuring method for wavelength of laser light |
| CN101603856A (en) * | 2009-07-16 | 2009-12-16 | 上海华魏光纤传感技术有限公司 | A kind of long-distance distributed optical fiber vibration sensing system and method |
| CN105137451A (en) * | 2015-08-26 | 2015-12-09 | 中国科学技术大学 | All-fiber wind measurement laser radar based on 1 mu m-2 mu m gas molecular absorption line |
| CN105628065A (en) * | 2015-12-22 | 2016-06-01 | 南京工程学院 | Fiber grating signal demodulation device and demodulation method |
| CN106019313A (en) * | 2016-08-05 | 2016-10-12 | 中国科学技术大学 | Single-pixel detection wind measuring lidar based on polarization double edges |
| CN106054209A (en) * | 2016-05-19 | 2016-10-26 | 中国科学技术大学 | Atmospheric detection laser radar based on superconducting single-photon detector |
| CN106443640A (en) * | 2016-09-27 | 2017-02-22 | 中国科学技术大学 | Time division fixed frequency shift technique-based FPI (Fabry-Perot interferometer) frequency calibration method |
| CN107102322A (en) * | 2017-05-02 | 2017-08-29 | 哈尔滨工业大学 | Microwave laser radar integral system |
| CN108761487A (en) * | 2018-07-13 | 2018-11-06 | 中国电子科技集团公司第二十六研究所 | A kind of big bandwidth laser windfinding radar system |
| US20190018115A1 (en) * | 2017-07-12 | 2019-01-17 | Airbus Defence and Space GmbH | Lidar arrangement and lidar method |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4932378B2 (en) * | 2006-08-08 | 2012-05-16 | 三菱電機株式会社 | Coherent rider device |
| CN101710178B (en) * | 2009-12-04 | 2012-10-10 | 中国海洋大学 | Real-time calibration high spectral resolution lidar device |
| CN101825710A (en) * | 2009-12-24 | 2010-09-08 | 哈尔滨工业大学 | 2 mu m all-fiber coherent laser Doppler wind finding radar system |
| CN105093238B (en) * | 2015-09-07 | 2018-07-17 | 国耀量子雷达科技有限公司 | The Transflective dual edge anemometry laser radar that single-chamber F-P interferometer simple detectors are realized |
| CN105866795B (en) * | 2016-05-19 | 2018-08-03 | 中国科学技术大学 | The Larger Dynamic Wind measurement laser radar of F-P interferometers is scanned based on all -fiber |
| CN106886031B (en) * | 2017-02-27 | 2019-07-26 | 南京红露麟激光雷达科技有限公司 | Rayleigh Doppler anemometry laser radar based on wide range gating coherent detection |
| CN109143263B (en) * | 2018-07-05 | 2022-11-01 | 夏和娣 | Mixed type wind measurement laser radar |
| CN109959944B (en) * | 2019-03-29 | 2023-06-16 | 中国科学技术大学 | Wind lidar based on wide-spectrum light source |
-
2019
- 2019-03-29 CN CN201910256086.7A patent/CN109959944B/en active Active
- 2019-08-08 WO PCT/CN2019/099781 patent/WO2020199447A1/en active Application Filing
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002131022A (en) * | 2000-10-23 | 2002-05-09 | Oki Electric Ind Co Ltd | Optical fiber sensing system and measuring method for wavelength of laser light |
| CN101603856A (en) * | 2009-07-16 | 2009-12-16 | 上海华魏光纤传感技术有限公司 | A kind of long-distance distributed optical fiber vibration sensing system and method |
| CN105137451A (en) * | 2015-08-26 | 2015-12-09 | 中国科学技术大学 | All-fiber wind measurement laser radar based on 1 mu m-2 mu m gas molecular absorption line |
| CN105628065A (en) * | 2015-12-22 | 2016-06-01 | 南京工程学院 | Fiber grating signal demodulation device and demodulation method |
| CN106054209A (en) * | 2016-05-19 | 2016-10-26 | 中国科学技术大学 | Atmospheric detection laser radar based on superconducting single-photon detector |
| CN106019313A (en) * | 2016-08-05 | 2016-10-12 | 中国科学技术大学 | Single-pixel detection wind measuring lidar based on polarization double edges |
| CN106443640A (en) * | 2016-09-27 | 2017-02-22 | 中国科学技术大学 | Time division fixed frequency shift technique-based FPI (Fabry-Perot interferometer) frequency calibration method |
| CN107102322A (en) * | 2017-05-02 | 2017-08-29 | 哈尔滨工业大学 | Microwave laser radar integral system |
| US20190018115A1 (en) * | 2017-07-12 | 2019-01-17 | Airbus Defence and Space GmbH | Lidar arrangement and lidar method |
| CN108761487A (en) * | 2018-07-13 | 2018-11-06 | 中国电子科技集团公司第二十六研究所 | A kind of big bandwidth laser windfinding radar system |
Non-Patent Citations (2)
| Title |
|---|
| 上官明佳: "1.5μm单光子探测器在激光遥感中的应用", 《中国博士学位论文全文数据库信息科技辑》 * |
| 张楠楠等: "相干光路的直接探测多普勒激光雷达设计", 《中国激光》 * |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020199447A1 (en) * | 2019-03-29 | 2020-10-08 | 中国科学技术大学 | Broad-spectrum light source-based wind measurement lidar |
| CN110764104A (en) * | 2019-11-07 | 2020-02-07 | 浙江缔科新技术发展有限公司 | Light quantum laser sighting telescope with wind measuring function |
| CN110764104B (en) * | 2019-11-07 | 2023-05-12 | 浙江缔科新技术发展有限公司 | Light quantum laser sighting telescope with wind measuring function |
| CN111257851A (en) * | 2020-04-03 | 2020-06-09 | 厦门大学 | Spectrum measurement method based on wide-spectrum light source and spectrum scanning laser radar |
| CN113281725A (en) * | 2021-05-13 | 2021-08-20 | 中国科学技术大学 | Laser radar optical transceiving system and feedback adjusting method thereof |
| CN115015966A (en) * | 2022-08-04 | 2022-09-06 | 南京信息工程大学 | Gas detection laser radar based on wide-spectrum light source |
| CN115015966B (en) * | 2022-08-04 | 2022-10-28 | 南京信息工程大学 | Gas detection laser radar based on wide-spectrum light source |
| CN115453574A (en) * | 2022-10-27 | 2022-12-09 | 南京信息工程大学 | Multifunctional laser radar for atmospheric multi-parameter detection |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109959944B (en) | 2023-06-16 |
| WO2020199447A1 (en) | 2020-10-08 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109959944A (en) | Anemometry laser radar based on wide spectrum light source | |
| CN106054209B (en) | The Atmospheric Survey laser radar of based superconductive single-photon detector | |
| EP3067713B1 (en) | Ladar systems with dynamic receiver filters | |
| US5847817A (en) | Method for extending range and sensitivity of a fiber optic micro-doppler ladar system and apparatus therefor | |
| US5847816A (en) | Fiber optic micro-doppler ladar system and operating method therefor | |
| CN105408764B (en) | Coaxially directly detect LIDAR system | |
| CN105866795B (en) | The Larger Dynamic Wind measurement laser radar of F-P interferometers is scanned based on all -fiber | |
| CN106019313B (en) | Single pixel based on polarization dual edge detects anemometry laser radar | |
| CN110082778B (en) | Coherent wind lidar based on single photon detection | |
| CN106940444B (en) | Coherent Doppler wind-observation laser radar based on microwave differential gain | |
| US7312855B1 (en) | Combined coherent and incoherent imaging LADAR | |
| US6388739B1 (en) | Self-referencing microdoppler ladar receiver and associated detection method | |
| CN109725320A (en) | A kind of laser radar | |
| CN111665486B (en) | Laser radar system | |
| CN108375774A (en) | A kind of single photon image detecting laser radar of no-raster | |
| CN110749872A (en) | Coherent differential absorption laser radar and method for detecting gas concentration | |
| CN105334519B (en) | More atmospheric parameters based on triple channel F-P etalons while detected with high accuracy laser radar system | |
| CN100495070C (en) | Microwave windfinding laser radar apparatus | |
| CN106226783B (en) | Atmospheric particulates optical parameter measurement system based on laser radar | |
| EP2414863A1 (en) | Generation and detection of frequency entangled photons | |
| CN110441792A (en) | The Rayleigh lidar system and dependent correction method of wind thermometric are surveyed simultaneously | |
| CN109975790A (en) | A kind of reception device of multi-wavelength laser radar | |
| CN110161280A (en) | Mixing detection Doppler lidar wind velocity measurement system and its measurement method | |
| CN110456383A (en) | A kind of molecular scattering coherent lidar system | |
| CN102662165A (en) | Active-passive composite array type photoelectric detection device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |