CN108983417A - A kind of optical filter, Doppler anemometry laser radar and Wind field measurement method - Google Patents
A kind of optical filter, Doppler anemometry laser radar and Wind field measurement method Download PDFInfo
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
- G01S17/88—Lidar systems specially adapted for specific applications
- G01S17/95—Lidar systems specially adapted for specific applications for meteorological use
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
- G01S7/481—Constructional features, e.g. arrangements of optical elements
- G01S7/4816—Constructional features, e.g. arrangements of optical elements of receivers alone
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/20—Filters
- G02B5/28—Interference filters
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/20—Filters
- G02B5/28—Interference filters
- G02B5/284—Interference filters of etalon type comprising a resonant cavity other than a thin solid film, e.g. gas, air, solid plates
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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
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- Optical Radar Systems And Details Thereof (AREA)
Abstract
The invention discloses a kind of optical filter, Doppler anemometry laser radar and Wind field measurement method, which includes: interferometric filter, the first F-P etalon and the 2nd F-P etalon of same optical axis setting；The bandwidth of the first F-P etalon and the bandwidth of the 2nd F-P etalon are respectively less than the bandwidth of the interferometric filter, and the bandwidth of the first F-P etalon and the bandwidth of the 2nd F-P etalon are unequal.As it can be seen that the optical filter tool is there are two F-P etalon, the optical filter that two F-P etalon combination interferometric filters are formed has lesser bandwidth, it is filtered out for Direct-Detection Doppler Wind Lidar daylight observation bias light, bias light on daytime can effectively be inhibited, stable structure is had excellent performance.
Description
Technical field
The present invention relates to optical element technology fields, more specifically, being related to a kind of optical filter, Doppler anemometry laser thunder
It reaches and Wind field measurement method.
Background technique
Wind speed and direction is one of most important parameter in atmospheric dynamics research, and the direct detection based on molecular scattering
Doppler anemometry laser radar has original advantage in Middle and upper atmosphere wind field observation field: spatial and temporal resolution is high, detection accuracy
Height, investigative range is wide, can provide dimensional wind information etc., therefore the most attention by countries in the world.Doppler anemometry laser
Radar can provide the ability of dimensional wind information, in climatic study and weather with its high-resolution, high-precision, big investigative range
Forecast aspect has important application, and causes the concern that the world is multinational, and put into a large amount of human and material resources and studied.It presses
Different according to Doppler frequency detection mode, Doppler anemometry laser radar technology can be divided into coherent detection technology and non-coherent detection
(direct detection) technology.Coherent detection technology is to carry out beat frequency using aerosol backscatter signal and transmitting laser local oscillator come anti-
Doppler frequency is drilled, suitable for detecting the atmospheric wind that wind speed is less big, is closer；Incoherent technique is that atmosphere gas is molten
The variation of the frequency of glue or molecule backscatter signal be converted into the variation of relative intensity or the movement of interference fringe how general carry out inverting
Frequency is strangled, the former is referred to as marginal technology, and the latter is known as fringe technique.Incoherent technique is mainly used for high-altitude or larger
The measurement of wind speed.
Currently, most Direct-Detection Doppler Wind Lidar systems are only limitted to night-time observation.This is because
During daylight observation, the intensity of ambient noise (mainly sunlight) is very high, causes detection signal-to-noise ratio very low, to affect
Measurement height and precision.Realize the daylight observation of Direct-Detection Doppler Wind Lidar, it is necessary to develop background on daytime
Xanthophyll cycle technology.Common practice is to increase spike interference filter in the receiving light path of laser radar, to limit background
Light enters optical receiver.Currently, the bandwidth for being able to produce the interferometric filter that central wavelength is 355nm both at home and abroad mostly exists
The bandwidth of 1nm or more, the optical filter of minority customization can reach 0.15nm, the bandwidth of existing common optical filter and the band of laser
Width about 0.084pm is compared with Doppler's frequency discriminator working width 2.14pm, and wide 50-100 times or so, therefore do not still meet reality
Border needs.
Summary of the invention
To solve the above-mentioned problems, technical solution of the present invention provide a kind of optical filter, Doppler anemometry laser radar with
And Wind field measurement method, the optical filter have lesser bandwidth, it, can when the optical filter is used for Doppler anemometry laser radar
Effectively to overcome the problems, such as that daytime ambient noise signal is too strong, measurement accuracy is improved.
To achieve the goals above, the invention provides the following technical scheme:
A kind of optical filter, the optical filter include:
With interferometric filter, the first F-P etalon and the 2nd F-P etalon of optical axis setting；
The bandwidth of the first F-P etalon and the bandwidth of the 2nd F-P etalon are respectively less than the interferometric filter
Bandwidth；
The bandwidth of the first F-P etalon and the bandwidth of the 2nd F-P etalon are unequal.
Preferably, in above-mentioned optical filter, the bandwidth of the interferometric filter is less than 0.5nm.
Preferably, in above-mentioned optical filter, the center operating wavelength of the interferometric filter is 354.7nm, and bandwidth is
0.15nm, peak transmittance are greater than 70%.
Preferably, in above-mentioned optical filter, the interferometric filter, the first F-P etalon and the 2nd F-P
Etalon is successively arranged in a first direction；
Wherein, the first direction is parallel to the optical axis, and is the incident direction of light, the first F-P etalon
Band be wider than the bandwidth of the 2nd F-P etalon.
Preferably, in above-mentioned optical filter, the central wavelength of the first F-P etalon and the 2nd F-P etalon
Central wavelength it is identical as the central wavelength of the interferometric filter.
Preferably, in above-mentioned optical filter, the spacing of freely composing of the first F-P etalon is 120pm-170pm, including
Endpoint value；Its bandwidth is 6pm-10pm, including endpoint value；Its effective fineness is 16-20, including endpoint value；Its broadness of tuning
For 4pm-10pm, including endpoint value；
The spacing of freely composing of the 2nd F-P etalon is 10pm-50pm, including endpoint value；Its bandwidth is 1pm-3pm,
Including endpoint value；Its effective fineness is 14-18, including endpoint value；Its broadness of tuning is 4pm-10pm, including endpoint value.
Preferably, in above-mentioned optical filter, the spacing of freely composing of the first F-P etalon is 150pm, and bandwidth is
8.39pm, the effective fineness 18, broadness of tuning 4pm-10pm；
The spacing of freely composing of the 2nd F-P etalon is 33.58pm, bandwidth 2.1pm, the effective fineness 16, tune
Humorous width is 4pm-10pm.
Preferably, in above-mentioned optical filter, which is characterized in that the first F-P etalon and the 2nd F-P etalon
It is the structure of whole solid state with the air gap；
The first F-P etalon and the 2nd F-P etalon all have two substrates being oppositely arranged in parallel, and two
There is the air gap between the substrate being oppositely arranged；
The substrate is the glass of zero thermal expansion；
The chamber of the first F-P etalon is long long fixed with the chamber of the 2nd F-P etalon.
Preferably, in above-mentioned optical filter, the bandwidth of the optical filter is less than 2pm, and cut-off depth is greater than 7.
The present invention also provides a kind of Doppler anemometry laser radar, the Doppler anemometry laser radar includes:
Laser transmitting system, the laser transmitting system is for emitting detection laser；
Laser receiver system, the laser receiver system are used to obtain the detection laser returning by atmospheric backscatter
The clawback signal after being filtered, is converted to electric signal by wave signal；
The data processing equipment is used to be based on the electric signal measurement atmospheric wind；
Wherein, the laser receiver system includes filter described in any of the above embodiments, is filtered by the filter
Light.
The present invention also provides a kind of Wind field measurement method, the Wind field measurement method includes:
Emit detection laser by laser transmitting system；
The echo-signal that the detection laser passes through atmospheric backscatter is obtained by laser receiver system；
It is filtered by the optical receiver system to the echo-signal；
The echo-signal after optical filtering is converted into electric signal by the optical receiver system；
Data processing is carried out to the electric signal by data processing equipment, to measure atmospheric wind；
Wherein, the laser receiver system includes such as described in any item filters of claim 1-8, passes through the filtering
Device filters.
As can be seen from the above description, the optical filter that technical solution of the present invention provides includes: the interference filter of same optical axis setting
Piece, the first F-P etalon and the 2nd F-P etalon；The bandwidth of the first F-P etalon and the 2nd F-P etalon
Bandwidth be respectively less than the bandwidth of the interferometric filter, and the bandwidth of the first F-P etalon and the 2nd F-P etalon
Bandwidth it is unequal.As it can be seen that the optical filter tool is there are two F-P etalon, two F-P etalon combination interferometric filters are formed
Optical filter there is lesser bandwidth, filtered out for Direct-Detection Doppler Wind Lidar daylight observation bias light, can be with
Effectively inhibit bias light on daytime, stable structure is had excellent performance.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
The embodiment of invention for those of ordinary skill in the art without creative efforts, can also basis
The attached drawing of offer obtains other attached drawings.
Fig. 1 is a kind of structural schematic diagram of optical filter provided in an embodiment of the present invention；
Fig. 2 is a kind of transmittance curve schematic diagram of interferometric filter provided in an embodiment of the present invention；
Fig. 3 is a kind of transmittance curve schematic diagram of Broadband Solid-state F-P etalon provided in an embodiment of the present invention；
Fig. 4 is a kind of transmittance curve schematic diagram of narrowband solid-state F-P etalon provided in an embodiment of the present invention；
Fig. 5 is after a kind of Broadband Solid-state F-P etalon provided in an embodiment of the present invention is combined with narrowband solid-state F-P etalon
Transmittance curve schematic diagram；
Fig. 6 is a kind of transmittance curve schematic diagram of optical filter provided in an embodiment of the present invention；
Fig. 7 is a kind of structural schematic diagram of Doppler anemometry laser radar provided in an embodiment of the present invention；
Fig. 8 is a kind of flow diagram of Wind field measurement method provided in an embodiment of the present invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Combine super spike interference filter to bias light on daytime using single F-P etalon (Fabry-Perot etalon)
The technology inhibited was also once used in a small number of laser radar systems, as Fe (iron) Boltzmann laser radar to temperature into
Row detection.
F-P etalon is made of two blocks of parallel glass plates or quartz plate, after incident light vertical irradiation to etalon,
It is reflected repeatedly between the two plate faces, forms the interference circle of multiple beam, the optical interference of specific wavelength enhances to form bright fringes,
The optical interference cancellation of other wavelength forms dark fringe.Relationship between F-P etalon transmitance and wavelength has cyclophysis.This
The use of kind cyclophysis combination interferometric filter, can filter out the most sun on daytime bias lights.Due to swashing for the type
Optical radar only does energy detection, and the laser light source used requires nothing more than output also as single longitudinal mode, and of less demanding to laser linewidth, because
This this method relative efficiency.But for frequency detecting to be realized, laser linewidth usually only has how general less than hundred megahertzs
For strangling anemometry laser radar, the bandwidth for the optical filter that this technology is formed just is difficult to meet the requirements.
To solve the above-mentioned problems, super narrow-band-filter is combined using double F-P etalons the embodiment of the invention provides a kind of
The optical filter of piece, the optical filter can by effective clear aperatures of the double F-P etalons of comprehensive design, freely compose spacing, bandwidth
With the parameters such as the effective fineness, the magnitude of the bandwidth reduction of optical filter to micromicron can be swashed to realize Doppler anemometry
The daylight observation of optical radar.
In order to make the foregoing objectives, features and advantages of the present invention clearer and more comprehensible, with reference to the accompanying drawing and specific real
Applying mode, the present invention is described in further detail.
With reference to Fig. 1, Fig. 1 is a kind of structural schematic diagram of optical filter provided in an embodiment of the present invention, and the optical filter can be with
For Direct-Detection Doppler Wind Lidar.The optical filter includes: interferometric filter 11, the first F- of same optical axis setting
P etalon 12 and the 2nd F-P etalon 13.
The bandwidth of the first F-P etalon 12 and the bandwidth of the 2nd F-P etalon 13 are respectively less than the interference and filter
The bandwidth of mating plate 11；The bandwidth of the first F-P etalon 12 and the bandwidth of the 2nd F-P etalon 13 are unequal.
Optionally, the bandwidth of the interferometric filter 11 is less than 0.5nm.Specifically, the center of the interferometric filter 11
Operation wavelength is 354.7nm, and bandwidth 0.15nm, peak transmittance is greater than 70%.
In mode shown in Fig. 1, the interferometric filter 11, the first F-P etalon 12 and the 2nd F-P mark
Quasi- tool 13 is successively arranged in a first direction；Wherein, the first direction is parallel to the optical axis, and is the incident direction of light
The band of (as shown by the arrows in Figure 1), the first F-P etalon 12 is wider than the bandwidth of the 2nd F-P etalon 13.Three
Distributing order can be any, be not limited to mode shown in Fig. 1, can be three arbitrary arrangement combination.
The central wavelength of the central wavelength of the first F-P etalon 12 and the 2nd F-P etalon 13 with it is described
The central wavelength of interferometric filter 11 is identical.
The spacing of freely composing of the first F-P etalon 12 is 120pm-170pm, including endpoint value；Its bandwidth is 6pm-
10pm, including endpoint value；Its effective fineness is 16-20, including endpoint value；Its broadness of tuning is 4pm-10pm, including endpoint
Value；The spacing of freely composing of the 2nd F-P etalon 13 is 10pm-50pm, including endpoint value；Its bandwidth is 1pm-3pm, including
Endpoint value；Its effective fineness is 14-18, including endpoint value；Its broadness of tuning is 4pm-10pm, including endpoint value.Specifically,
The spacing of freely composing of the first F-P etalon 12 is 150pm, and bandwidth 8.39pm, the effective fineness 18, broadness of tuning is
4pm-10pm；The 2nd F-P etalon 13 freely compose spacing be 33.58pm, bandwidth 2.1pm, the effective fineness 16,
Broadness of tuning is 4pm-10pm.
The first F-P etalon 12 and the 2nd F-P etalon 13 are the structure of whole solid state with the air gap；
The first F-P etalon 12 all has two substrates being oppositely arranged in parallel with the 2nd F-P etalon 13, and two opposite
There is the air gap between the substrate of setting；The substrate is the glass of zero thermal expansion；The chamber of the first F-P etalon 12
It is long long fixed with the chamber of the 2nd F-P etalon 13.
Optical filter provided in an embodiment of the present invention is a kind of ultra-narrow band pass filter based on double F-P etalons, can be made
Bandwidth of operation is less than 2pm, and cut-off depth is greater than 7, by effective clear aperature of the double F-P etalons of comprehensive design, freely compose between
Away from the parameters such as, bandwidth and the effective fineness, the daylight observation of Direct-Detection Doppler Wind Lidar is realized.The present invention is real
The structure that the example technical solution uses two solid air gap F-P etalon combination interferometric filters is applied, combination forms ultra-narrow
The optical filter of bandwidth, to solve to carry on the back daytime when Direct-Detection Doppler Wind Lidar centering upper atmosphere wind is observed
The too strong problem of scape noise.
It is illustrated below with reference to the effect of specific data parameters optical filter described in the embodiment of the present application.
Optical filter described in the embodiment of the present invention is by a broadband F-P etalon and a narrowband F-P etalon and one
Interferometric filter composition, is combined with interferometric filter by two F-P etalons, can balance big inhibition range and ultra-narrow
Both bandwidth (bandwidth is less than 0.1nm), thus to (height above sea level 2km-60km) atmospheric wind daylight observation mistake on the middle and senior level
Ambient noise in journey is preferably inhibited.
For the first F-P etalon 12 with the 2nd F-P etalon 13, one is the solid-state F-P standard of wide bandwidth
Tool, another one are the solid-state F-P etalon of narrow bandwidth.The band for setting the first F-P etalon 12 is wider than the 2nd F-P etalon 13
Bandwidth, at this point, the first F-P etalon 12 be broadband F-P etalon, the 2nd F-P etalon 13 be narrowband F-P etalon.Tool
Body, two F-P etalons are solid-state F-P etalon.
When the optical filter is used for Doppler anemometry laser radar, by the launch wavelength tune of the laser in laser radar
Section is extremely consistent with the central wavelength of interferometric filter, after atmospheric backscatter light is received by telescope, brought into optical receiver
Carry out frequency detecting.The effect of interferometric filter includes: tentatively to be filtered out to sun bias light in optical filter, through the optical filtering
The light of device is the quasi-monochromatic light that center wavelength is 354.7nm；And inhibit two F-P etalons in non-selected FSR (between freely composing
Away from) band logical.
With reference to Fig. 2, Fig. 2 is a kind of transmittance curve schematic diagram of interferometric filter provided in an embodiment of the present invention, this hair
The center operating wavelength of the interferometric filter used in optical filter described in bright embodiment is 354.7nm, bandwidth 0.15nm, peak value
Transmitance is greater than 70%.In Fig. 2, horizontal axis is wavelength, and unit nm, the longitudinal axis is transmitance.
With reference to Fig. 3, Fig. 3 is a kind of transmittance curve signal of Broadband Solid-state F-P etalon provided in an embodiment of the present invention
Figure, for Broadband Solid-state F-P etalon, freely composing spacing is 150pm, and bandwidth 8.39pm, the effective fineness is 18 or close
Approximately equal to 18.Broadband Solid-state F-P etalon uses air-gap structure of whole solid state, and chamber is long to be fixed, and two parallel plates material is zero
Expanded glass, temperature coefficient is extremely low, has good spectrum stability.Meanwhile it is humorous by angle adjustment, 4pm- may be implemented
The broadness of tuning of 10pm, to be exactly matched with laser wavelength.Doppler anemometry laser radar at work, the Broadband Solid-state
The main function of F-P etalon is further suppressed to observation background light on daytime, and one free spectrum width of frequency discriminator is only allowed
Molecular scattering light in range enters optical receiver.In Fig. 3, horizontal axis is wavelength, and unit nm, the longitudinal axis is transmitance.
With reference to Fig. 4, Fig. 4 is a kind of transmittance curve signal of narrowband solid-state F-P etalon provided in an embodiment of the present invention
Figure, for the narrowband solid-state F-P etalon, freely composing spacing is 33.58pm, and bandwidth 2.1pm, the effective fineness is 16 or close
Approximately equal to 16.Similar with above-mentioned Broadband Solid-state F-P standard, narrowband solid-state F-P etalon equally uses all solid state knot of air-gap
Structure, chamber is long to be fixed, and two parallel plates material is zero expansion glass, and temperature coefficient is extremely low, has good spectrum stability.Have
The humorous function of angle adjustment, may be implemented the broadness of tuning of 4pm-10pm, can match with laser wavelength.Doppler anemometry swashs
The main function of the optical radar narrowband solid-state F-P etalon at work is the bandwidth for compressing entire optical filter, to realize back
Scape light further suppresses, and reduces ambient noise.In Fig. 4, horizontal axis is wavelength, and unit nm, the longitudinal axis is transmitance.
As can be seen from figs. 3 and 4 there is the identical wave crest of multiple peak values for two F-P etalons, there is big inhibition
Range.
With reference to Fig. 5, Fig. 5 is a kind of Broadband Solid-state F-P etalon provided in an embodiment of the present invention and narrowband solid-state F-P standard
Transmittance curve schematic diagram after tool combination, two F-P etalon combinations can be greatly decreased number of peaks, reduce bandwidth, therefore
It can be very good to balance big inhibition range and ultra-narrow bandwidth the two characterisitic parameters.In Fig. 5, horizontal axis is wavelength, unit nm,
The longitudinal axis is transmitance.
With reference to Fig. 6, Fig. 6 is a kind of transmittance curve schematic diagram of optical filter provided in an embodiment of the present invention, can by Fig. 6
See, only one peak value of optical filter described in the embodiment of the present invention, realizes wide freely compose between spacing and narrow ultra-narrow bandwidth the two
Balance.In Fig. 6, horizontal axis is wavelength, and unit nm, the longitudinal axis is transmitance.
Optical filter described in the embodiment of the present invention be a kind of super narrowband light filter based on double F-P etalons, in order to guarantee compared with
Good filter effect, can be preferable to provide interferometric filter 11, broadband F-P etalon and narrowband F-P etalon by such as Fig. 1 institute
Show tandem with optical axis combine place, and need to by the center wavelength tuning of broadband F-P etalon and narrowband F-P etalon to
The central wavelength of interferometric filter 11 is consistent, and combination is formed, and optical filter described in the embodiment of the present invention can make optical filter
Comprehensive bandwidth is less than 2pm, and cut-off depth OD is greater than 7, greatly improves Direct-Detection Doppler Wind Lidar Sky Background During Daytime
The ambient noise rejection ability of survey.
Compared with prior art, advantage has optical filter described in the embodiment of the present invention:
The existing simple background using interferometric filter is changed in Direct-Detection Doppler Wind Lidar field
Xanthophyll cycle technology, interferometric filter is combined to be formed by technical solution described in the embodiment of the present invention with two F-P etalons to be had
The optical filter of ultra-narrow bandwidth, so that in interferometric filter bandwidth, broadband and the F-P etalon of narrowband two and interferometric filter group
Only one peak value of the transmittance curve of the optical filter of synthesis realizes and wide freely compose spacing and ultra-narrow bandwidth putting down therebetween
Weighing apparatus；
The bandwidth of optical filter described in the embodiment of the present invention has reached pm magnitude, and cut-off depth OD is more than 7, to press down well
The ambient noise during daylight observation has been made, detection signal-to-noise ratio is improved, can effectively promote direct detection Doppler anemometry
Detection height and precision of the laser radar in daylight observation；
Optical filter described in the embodiment of the present invention uses all solid state F-P etalon of air-gap, and compact-sized, temperature drift coefficient is small,
Tuning range is big, and spectrum property is stablized；
Optical filter described in the embodiment of the present invention is for realizing Direct-Detection Doppler Wind Lidar Middle and upper atmosphere wind
Field round-the-clock continuous observation has very great meaning.It compares and only uses single F-P etalon, because of processing technology reason,
Ultra-narrow bandwidth and wider spacing of freely composing not can be implemented simultaneously, and two in optical filter described in the embodiment of the present invention F-P standard
Tool, which is combined, thoroughly to be solved this problem in that, ultra-narrow bandwidth and the wider balance freely composed between spacing are realized.
The optical filter based on the above embodiment, another embodiment of the present invention additionally provide a kind of Doppler anemometry laser thunder
It reaches, as shown in fig. 7, Fig. 7 is a kind of structural schematic diagram of Doppler anemometry laser radar provided in an embodiment of the present invention, it is described more
General Le anemometry laser radar includes: laser transmitting system 2, and the laser transmitting system 2 is for emitting detection laser；Laser pick-off
System 100, the laser receiver system 100 are used to obtain the echo-signal that the detection laser passes through atmospheric backscatter, into
After row filters, the clawback signal is converted into electric signal, sends data processing equipment 6；The data processing equipment 6 is used for base
In the electric signal measurement atmospheric wind.Wherein, the filter is filter described in above-described embodiment.
The laser receiver system 100 includes filter 4, is filtered by the filter 4.Filter 4 is above-mentioned
Filter described in embodiment.
Optionally, the laser receiver system 100 further includes telescope 3 and photomultiplier tube 5.The telescope 3 is used
In obtaining the echo-signal, the filter 4 is sent by the echo-signal.The setting of optical filter 4 is looked in the distance described
The light-emitting window of mirror 3, the echo-signal for being emitted to the telescope 3 filter.The photomultiplier tube 5 is for obtaining
The echo-signal to filter by the optical filter 4 is taken, the echo-signal is converted into electric signal, sends data processing equipment 6.
The laser receiver system 100 can use the reception system of traditional Direct-Detection Doppler Wind Lidar,
Also there is optical receiver and frequency discriminator and telescope etc., be with existing reception system difference using the embodiment of the present application
The optical filter 4.
The Doppler anemometry laser radar is Direct-Detection Doppler Wind Lidar.The Doppler anemometry laser
Radar has laser 1, and the laser is emitted as light supply apparatus, the laser transmitting system 2 based on the laser 1
Laser generates detection laser.The laser that the laser 1 is emitted also passes through with the laser that the laser transmitting system 2 is emitted to be coupled
After device coupling, it is sent to the processing unit 6 by a lens, the processing unit 6 is converted to the laser after the coupling
Electric signal carries out data processing to the electric signal, in order to control laser 1 and laser transmitting system 2.
When the Doppler anemometry laser radar works, the laser that laser 1 emits forms echo through atmospheric backscatter
Signal, echo-signal are received by the optical telescope 3 in laser receiver system 100, and echo-signal is collimated to first pass through interference
Optical filter filters out most of sun bias light, but since the bandwidth of interferometric filter is too wide, still there is about 50 freedom of frequency discriminator
The bias light for composing spacing bandwidth penetrates interferometric filter.Enter broadband F-P etalon progress background through the light of interferometric filter
Light further filters out, and only about 1, the frequency discriminator bias light for freely composing spacing bandwidth penetrates in entire molecular scattering spectrum at this time, so
Enter narrowband F-P etalon afterwards, the bandwidth of ambient noise is further restricted to 2.1pm by narrowband F-P etalon, with frequency discriminator
Bandwidth of operation is suitable, and so far, the process that entire bias light filters out is completed.
Doppler anemometry laser radar described in the embodiment of the present invention, can be better using optical filter described in above-described embodiment
Wiping out background noise, can effectively inhibit bias light on daytime, and stable structure is had excellent performance.
The optical filter and Doppler anemometry based on the above embodiment, another embodiment of the present invention additionally provide a kind of wind
Field measurement method, the Wind field measurement method is as shown in figure 8, Fig. 8 is a kind of Wind field measurement method provided in an embodiment of the present invention
Flow diagram, the Wind field measurement method include:
Step S11: detection laser is emitted by laser transmitting system.
Step S12: the echo-signal that the detection laser passes through atmospheric backscatter is obtained by laser receiver system.
Step S13: it is filtered by the optical receiver system to the echo-signal.
Wherein, it is filtered using filter described in above-described embodiment.
Step S14: the echo-signal after optical filtering is converted to by electric signal by the optical receiver system.
Step S15: data processing is carried out to the electric signal by data processing equipment, to measure atmospheric wind.
Can use above-mentioned is that Doppler anemometry laser radar described in example executes the Wind field measurement method, can be better
Wiping out background noise, can effectively inhibit bias light on daytime, and measurement result is accurate.
Each embodiment in this specification is described in a progressive manner, the highlights of each of the examples are with other
The difference of embodiment, the same or similar parts in each embodiment may refer to each other.For laser disclosed in embodiment
For radar and Wind field measurement method, since it is corresponded to the methods disclosed in the examples, so be described relatively simple, it is related
Place illustrates referring to the corresponding part of optical filter.
The foregoing description of the disclosed embodiments enables those skilled in the art to implement or use the present invention.
Various modifications to these embodiments will be readily apparent to those skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, of the invention
It is not intended to be limited to the embodiments shown herein, and is to fit to and the principles and novel features disclosed herein phase one
The widest scope of cause.
Claims (10)
1. a kind of optical filter, which is characterized in that the optical filter includes:
With interferometric filter, the first F-P etalon and the 2nd F-P etalon of optical axis setting；
The bandwidth of the first F-P etalon and the bandwidth of the 2nd F-P etalon are respectively less than the band of the interferometric filter
It is wide；
The bandwidth of the first F-P etalon and the bandwidth of the 2nd F-P etalon are unequal.
2. optical filter according to claim 1, which is characterized in that the bandwidth of the interferometric filter is less than 0.5nm.
3. optical filter according to claim 2, which is characterized in that the center operating wavelength of the interferometric filter is
354.7nm, bandwidth 0.15nm, peak transmittance are greater than 70%.
4. optical filter according to claim 1, which is characterized in that the interferometric filter, the first F-P etalon with
And the 2nd F-P etalon is successively arranged in a first direction；
Wherein, the first direction is parallel to the optical axis, and is the incident direction of light, the band of the first F-P etalon
It is wider than the bandwidth of the 2nd F-P etalon.
5. optical filter according to claim 1, which is characterized in that the central wavelength of the first F-P etalon with it is described
The central wavelength of 2nd F-P etalon is identical as the central wavelength of the interferometric filter.
6. optical filter according to claim 1, which is characterized in that the spacing of freely composing of the first F-P etalon is
120pm-170pm, including endpoint value；Its bandwidth is 6pm-10pm, including endpoint value；Its effective fineness is 16-20, including end
Point value；Its broadness of tuning is 4pm-10pm, including endpoint value；
The spacing of freely composing of the 2nd F-P etalon is 10pm-50pm, including endpoint value；Its bandwidth is 1pm-3pm, including
Endpoint value；Its effective fineness is 14-18, including endpoint value；Its broadness of tuning is 4pm-10pm, including endpoint value.
7. optical filter according to claim 6, which is characterized in that the spacing of freely composing of the first F-P etalon is
150pm, bandwidth 8.39pm, the effective fineness 18, broadness of tuning 4pm-10pm, including endpoint value；
The spacing of freely composing of the 2nd F-P etalon is 33.58pm, bandwidth 2.1pm, the effective fineness 16, tuning width
Degree is 4pm-10pm, including endpoint value.
8. optical filter according to claim 1-7, which is characterized in that the first F-P etalon and described the
Two F-P etalons are the structure of whole solid state with the air gap；
The first F-P etalon and the 2nd F-P etalon all have two substrates being oppositely arranged in parallel, and two opposite
There is the air gap between the substrate of setting；
The substrate is the glass of zero thermal expansion；
The chamber of the first F-P etalon is long long fixed with the chamber of the 2nd F-P etalon.
9. a kind of Doppler anemometry laser radar, which is characterized in that the Doppler anemometry laser radar includes:
Laser transmitting system, the laser transmitting system is for emitting detection laser；
Laser receiver system, the laser receiver system are used to obtain the detection laser and believe by the echo of atmospheric backscatter
Number, after being filtered, the clawback signal is converted into electric signal；
The data processing equipment is used to be based on the electric signal measurement atmospheric wind；
Wherein, the laser receiver system include such as the described in any item filters of claim 1-8, by the filter into
Row filters.
10. a kind of Wind field measurement method, which is characterized in that the Wind field measurement method includes:
Emit detection laser by laser transmitting system；
The echo-signal that the detection laser passes through atmospheric backscatter is obtained by laser receiver system；
It is filtered by the optical receiver system to the echo-signal；
The echo-signal after optical filtering is converted into electric signal by the optical receiver system；
Data processing is carried out to the electric signal by data processing equipment, to measure atmospheric wind；
Wherein, the laser receiver system include such as the described in any item filters of claim 1-8, by the filter into
Row filters.
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1880969A (en) * | 2006-04-18 | 2006-12-20 | 中国科学院安徽光学精密机械研究所 | Structure of Doppler wind lidar based on F-P standard utensil and detection method thereof |
| CN101493550A (en) * | 2007-10-26 | 2009-07-29 | 阿维尼克斯公司 | Continuous tuning for optical dispersion compensation synthesizers using cascaded etalons |
| CN101533159A (en) * | 2009-04-09 | 2009-09-16 | 浙江大学 | Third level Fabry-Perot cavity type tunable ray filter system |
| CN102279391A (en) * | 2011-06-21 | 2011-12-14 | 中国科学技术大学 | Doppler wind-measuring laser radar system |
| CN102288973A (en) * | 2011-06-28 | 2011-12-21 | 华中科技大学 | Multi-meteorological-parameter synchronous measuring method based on spectrum characteristic signals and laser radar |
| US20140340514A1 (en) * | 2013-05-14 | 2014-11-20 | Compagnie Industrielle Des Lasers Cilas | Fast optical shuttering system |
| CN106772750A (en) * | 2016-12-21 | 2017-05-31 | 中国科学技术大学 | For the ultra-narrow band pass filter of Middle and upper atmosphere wind field on daytime observation |
-
2018
- 2018-05-25 CN CN201810512975.0A patent/CN108983417A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1880969A (en) * | 2006-04-18 | 2006-12-20 | 中国科学院安徽光学精密机械研究所 | Structure of Doppler wind lidar based on F-P standard utensil and detection method thereof |
| CN101493550A (en) * | 2007-10-26 | 2009-07-29 | 阿维尼克斯公司 | Continuous tuning for optical dispersion compensation synthesizers using cascaded etalons |
| CN101533159A (en) * | 2009-04-09 | 2009-09-16 | 浙江大学 | Third level Fabry-Perot cavity type tunable ray filter system |
| CN102279391A (en) * | 2011-06-21 | 2011-12-14 | 中国科学技术大学 | Doppler wind-measuring laser radar system |
| CN102288973A (en) * | 2011-06-28 | 2011-12-21 | 华中科技大学 | Multi-meteorological-parameter synchronous measuring method based on spectrum characteristic signals and laser radar |
| US20140340514A1 (en) * | 2013-05-14 | 2014-11-20 | Compagnie Industrielle Des Lasers Cilas | Fast optical shuttering system |
| CN106772750A (en) * | 2016-12-21 | 2017-05-31 | 中国科学技术大学 | For the ultra-narrow band pass filter of Middle and upper atmosphere wind field on daytime observation |
Non-Patent Citations (1)
| Title |
|---|
| 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》 * |
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