CN105785397B - A kind of high spectral resolution atmospheric laser radar based on virtual image phased array - Google Patents
A kind of high spectral resolution atmospheric laser radar based on virtual image phased array Download PDFInfo
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- CN105785397B CN105785397B CN201610314491.6A CN201610314491A CN105785397B CN 105785397 B CN105785397 B CN 105785397B CN 201610314491 A CN201610314491 A CN 201610314491A CN 105785397 B CN105785397 B CN 105785397B
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- virtual image
- phased array
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
- G01S17/88—Lidar systems specially adapted for specific applications
- G01S17/95—Lidar systems specially adapted for specific applications for meteorological use
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A90/00—Technologies having an indirect contribution to adaptation to climate change
- Y02A90/10—Information and communication technologies [ICT] supporting adaptation to climate change, e.g. for weather forecasting or climate simulation
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Electromagnetism (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
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- Optical Radar Systems And Details Thereof (AREA)
Abstract
High spectral resolution atmospheric laser radar based on virtual image phased array by narrow linewidth laser, laser frequency stabilizing system, optical emission system, optical receiving system, is constituted based on virtual image phased array narrow band optical filter, multichannel photoelectric detecting system, Data collection and precessing system.It is made of virtual image phased array and diffraction grating based on virtual image phased array narrow band optical filter, output is the spectral interference striped of two-dimensional space arrangement, can be directly separated atmospheric aerosol Mie scattering and atmospheric molecule Rayleigh scattering.High spectral resolution atmospheric laser radar based on virtual image phased array virtual image phased array can directly measure atmospheric aerosol Mie scattering and atmospheric molecule Rayleigh scattering, and obtain the optical parameter of high-precision atmospheric aerosol and molecule.
Description
Technical field
The present invention relates to a kind of high spectral resolution atmospheric laser radars based on virtual image phased array, more specifically belong to
In a kind of using virtual image phased array as the high spectral resolution atmospheric laser radar of narrow band optical filter.
Background technology
High spectral resolution atmospheric laser radar can be directly separated atmospheric aerosol scattering using narrow band optical filter
It is scattered with atmospheric molecule, does not have to assume Lidar Ratios, to obtain the optical parameter of high-precision atmospheric aerosol and molecule.Mesh
The narrow band optical filter that preceding high spectral resolution atmospheric laser radar uses includes Fabry-Perot（Fabry–Pérot）It is dry
Interferometer, molecule（Atom）Filter etc..
Invention content
The object of the present invention is to provide a kind of high spectral resolution atmospheric laser radars based on virtual image phased array, wherein
Virtual image phased array coordinates diffraction grating as narrow band optical filter.
Virtual image phased array is optical dispersion device, can be the spectral interference of space arrangement by the linear light source dispersion of input
Striped.The spectrum that virtual image phased array exports is coupled in matched diffraction grating, then diffraction grating output is two-dimentional empty
Between the spectral interference striped that arranges, each spectral interference striped corresponds to an optical filter.
The present invention includes narrow linewidth laser, laser frequency stabilizing system, optical emission system, optical receiving system, is based on void
As phased array narrow band optical filter, multichannel photoelectric detecting system, Data collection and precessing system, which is characterized in that will
The output wavelength of narrow linewidth laser is locked in using laser frequency stabilizing system based on virtual image phased array narrow band optical filter
In one interference fringe.Using optical emission system by the laser Vertical Launch to air of frequency stabilization, then optics is utilized to receive
Systematic vertical receives air backscattering, and is coupled into based in virtual image phased array narrow band optical filter；Optical maser wavelength pair
The interference fringe answered can filter out the aerosol rice in the air backscattering of part（Mie）Scattering and molecule Rayleigh（Rayleigh）
Scattering；The interference fringe of optical maser wavelength both sides can filter out the Rayleigh scattering in the atmospheric echo of part respectively.Utilize multichannel light
The Mie scattering signal and Rayleigh scattering that filter out are converted into electric signal by electrical resistivity survey examining system, and import Data collection and precessing system.
Because of the wind speed very little in SEQUENCING VERTICAL direction, scattered signal Doppler frequency caused by vertical velocity is ignored in the present invention
The influence of shifting.Because the air Mie scattering and Rayleigh scattering model of laser are accurate it is found that using virtual image phased array is based on
The Mie scattering signal and multichannel Rayleigh scattering signal that narrow band optical filter filters out, can be finally inversed by air Mie scattering and Rayleigh dissipates
Intensity is penetrated, and then exports the optical parameter of corresponding atmospheric aerosol and molecule.
Used laser is characterized in that its caused air Mie scattering line width is less than and is based on virtual image phased array narrow band light
Learn the spectral width of an interference fringe of filter.It uses and is characterized in based on virtual image phased array narrow band optical filter
Twice of its Free Spectral Range is less than air Rayleigh scattering light spectral width.
Description of the drawings
The invention will be further described with reference to the accompanying drawings and examples.
Fig. 1, it is of the invention based on virtual image phased array narrow band optical filter structure chart
Fig. 2, the high spectral resolution atmospheric laser radar structure chart of the invention based on virtual image phased array
Fig. 3, the spectral interference striped and air Rayleigh of the invention based on virtual image phased array narrow band optical filter and
Mie scattering spectrum
Fig. 4, the air Mie scattering of the invention filtered out based on virtual image phased array narrow band optical filter and Rayleigh scattering
Signal
In figure：1. incident directional light, 2. cylindrical mirrors, 3. virtual image phased arrays, 4. auxiliary optical lens, 5. diffraction lights
Grid（By taking flat reflective grating as an example）, the spectral interference striped of the two-dimensional space arrangement at 6. diffraction grating image planes, 7.
Narrow linewidth laser, 8. laser frequency stabilizing systems, 9. optical emission systems, 10. optical receiving systems, 11. are based on virtual image phase
Bit array narrow band optical filter, 12. multichannel photoelectric detecting systems, 13. Data collection and precessing systems, 14. based on void
As the output spectrum interference fringe of phased array narrow band optical filter, the optical maser wavelength keyed end of 15. laser frequency stabilizing systems,
16. the air Mie scattering without Doppler frequency shift, the 17. air Rayleigh scatterings without Doppler frequency shift, 18. air Mie scattering lines
It is wide（Full width at half maximum）, the spectral width of 19. interference fringes based on virtual image phased array Optical Frequency Discriminator（Half Gao Quan
It is wide）, 20. Free Spectral Ranges based on virtual image phased array Optical Frequency Discriminator interference fringe, 21. air Rayleigh scattering line widths
（Full width at half maximum）, 22. λLThe air Mie scattering that place filters out, 23. λLThe air Rayleigh scattering that place filters out, 24. λL-1What place filtered out
Air Rayleigh scattering, 25. λL-2The air Rayleigh scattering that place filters out, 26. λL+1The air Rayleigh scattering that place filters out, 27. λL+2
The air Rayleigh scattering that place filters out.
Specific implementation mode
The object of the present invention is to provide a kind of high spectral resolution atmospheric laser radars based on virtual image phased array, with solution
Certainly the technical issues of related field.
The present invention's is as shown in Figure 1 based on virtual image phased array optical filter.Directional light（1）Through cylindrical lens（2）It is poly-
It is defocused to be incident on virtual image phased array（3）In.Virtual image phased array（3）Output pass through auxiliary optical lens（4）After be coupled to
Matched diffraction grating（5）In.According to actual conditions, auxiliary optical lens（4）It can also be not added with.Diffraction grating（5）Can be
Transmission-type is either reflective to can also be concave grating or plane grating.In the focal plane of diffraction grating（6）Place obtains two-dimentional sky
Between the spectral interference striped that arranges, wherein virtual image phased array existsyDirection has spectrum angle dispersion, diffraction grating to existxThere is light in direction
Spectral corner dispersion.
The high spectral resolution atmospheric laser radar based on virtual image phased array of the present invention is as shown in Figure 2.Narrow linewidth swashs
Light device（7）As light source, and utilize laser frequency stabilizing system（8）Optical maser wavelength is locked.Laser after frequency locking passes through optical emitting
System（9）Vertically into air.Utilize optical receiving system（10）Vertical reception air backscattering signal, and imported into and be based on
Virtual image phased array narrow band optical filter（11）In.Utilize multichannel photoelectric detecting system（12）Detection needed for based on the virtual image
Phased array narrow band optical filter（11）Output, and import Data collection and precessing system（13）.
In Fig. 3（14）It is the spectral interference striped exported based on virtual image phased array narrow band optical filter.If laser
Wavelength locking is in figure 3（15）Place corresponds to and is based on virtual image phased array narrow band optical filter central wavelength lambdaLInterference
Striped.Because of the wind speed very little in SEQUENCING VERTICAL direction, ignore scattered signal Doppler frequency shift caused by vertical velocity in the present invention
Influence, it is believed that Doppler frequency shift is zero in air backscattering signal.Air Mie scattering without Doppler frequency shift（16）And nothing
The air rice Rayleigh of Doppler frequency shift（17）Centre wavelength also exist（15）Place.The present invention claims air Mie scattering line widths（18）It is small
In the spectral width of an interference fringe based on virtual image phased array narrow band optical filter（19）, while being based on virtual image phase
The Free Spectral Range of array narrow band optical filter interference fringe（20）Twice be less than air Rayleigh scattering light spectral width
（21）.
Central wavelength lambda in Fig. 4LInterference fringe can filter out part air Mie scattering（22）With air Rayleigh scattering
(23)；Central wavelength lambdaL-2、λL-1、λL+1、λL+2Interference fringe can filter out respectively part air Rayleigh scattering (24), (25),
(26)、(27)。
Because the theoretical model based on virtual image phased array narrow band optical filter interference fringe is accurate it is found that laser simultaneously
Air Mie scattering and the theoretical model of Rayleigh scattering it is also accurate it is found that so air Rayleigh scattering (23) in Fig. 4, (24), (25),
(26), the mutual proportionate relationship of (27) can accurately calculate, and then can calculate air Mie scattering and air Rayleigh scattering
Intensity.
In short, the high spectral resolution atmospheric laser radar based on virtual image phased array can directly measure air in Fig. 2
Aerosol scattering and atmospheric molecule scattering strength, and obtain the optical parameter of high-precision atmospheric aerosol and molecule.
Claims (4)
1. a kind of high spectral resolution atmospheric laser radar based on virtual image phased array, it is characterised in that：By narrow-linewidth laser
Device, optical emission system, optical receiving system, is based on virtual image phased array narrow band optical filter, is mostly logical laser frequency stabilizing system
Road photoelectric detecting system, Data collection and precessing system are constituted；Wherein the output wavelength of narrow linewidth laser utilizes laser frequency stabilization
System lock, will be steady by optical emission system in an interference fringe based on virtual image phased array narrow band optical filter
In the laser Vertical Launch to air of frequency, optical receiving system vertical reception air backscattering is then utilized, and be coupled into base
In virtual image phased array narrow band optical filter；The corresponding interference fringe of laser frequency locking can filter out part air backscattering
In aerosol Mie scattering and molecule Rayleigh scattering；The interference fringe of optical maser wavelength both sides can filter out part atmospheric echo respectively
In Rayleigh scattering；The Mie scattering signal and Rayleigh scattering that filter out are converted into electric signal using multichannel photoelectric detecting system,
And import Data collection and precessing system.
2. a kind of high spectral resolution atmospheric laser radar based on virtual image phased array as described in claim 1, characteristic
It is, is made of virtual image phased array and diffraction grating based on virtual image phased array narrow band optical filter, is based on virtual image phase
The output of array narrow band optical filter is the spectral interference striped of two-dimensional space arrangement.
3. a kind of high spectral resolution atmospheric laser radar based on virtual image phased array as described in claim 1, characteristic
It is, twice of the Free Spectral Range based on virtual image phased array narrow band optical filter is less than air Rayleigh scattering light spectrum width
Degree.
4. a kind of high spectral resolution atmospheric laser radar based on virtual image phased array as described in claim 1, characteristic
It is, air Mie scattering line width caused by narrow linewidth laser is less than one based on virtual image phased array narrow band optical filter
The spectral width of interference fringe.
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| CN105785397B true CN105785397B (en) | 2018-08-17 |
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| CN112505711B (en) * | 2020-11-24 | 2023-03-31 | 中国科学院光电技术研究所 | Device for performing laser radar spectrum filtering by using reflective volume Bragg grating |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1641377A (en) * | 2004-01-06 | 2005-07-20 | 中国海洋大学 | Incoherent laser windfinding method and laser radar |
| CN101710178A (en) * | 2009-12-04 | 2010-05-19 | 中国海洋大学 | Real-time calibration high spectral resolution lidar device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US7974534B2 (en) * | 2006-08-11 | 2011-07-05 | Purdue Research Foundation | Wideband microwave and millimeter wave filters using photonic spectral filtering |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1641377A (en) * | 2004-01-06 | 2005-07-20 | 中国海洋大学 | Incoherent laser windfinding method and laser radar |
| CN101710178A (en) * | 2009-12-04 | 2010-05-19 | 中国海洋大学 | Real-time calibration high spectral resolution lidar device |
Non-Patent Citations (3)
| Title |
|---|
| THE ATMOSPHERIC DYNAMICS MISSION FOR GLOBAL WIND FIELD MEASUREMENT;AD STOFFELEN et al.;《Bulletin of the American Meteorological Society》;20050131;全文 * |
| 虚像相位阵列的二维成像原理及其应用;沈笑笑 等;《光电技术应用》;20120831;第27卷(第4期);59页第1-3段；60页第1段 * |
| 车载测风激光雷达风廓线同步观测实验;刘秉义 等;《量子电子学报》;20130131;第30卷(第1期);全文 * |
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