CN105785388A - Virtually imaged phased array-based water body Brillouin scattering and elastic scattering lidar - Google Patents
Virtually imaged phased array-based water body Brillouin scattering and elastic scattering lidar Download PDFInfo
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- CN105785388A CN105785388A CN201610314481.2A CN201610314481A CN105785388A CN 105785388 A CN105785388 A CN 105785388A CN 201610314481 A CN201610314481 A CN 201610314481A CN 105785388 A CN105785388 A CN 105785388A
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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
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- Optical Radar Systems And Details Thereof (AREA)
Abstract
The invention relates to a virtually imaged phased array-based water body Brillouin scattering and elastic scattering lidar. The virtually imaged phased array-based water body brillouin scattering and elastic scattering lidar is composed of a narrow linewidth laser, a laser frequency stabilization system, an optical transmitting system, an optical receiving system, a virtually imaged phased array-based narrow-band optical filter, a multichannel photoelectric detection system and a data acquisition and processing system. The virtually imaged phased array-based narrow-band optical filter is composed of a virtually imaged phased array and a diffraction grating; the output of the virtually imaged phased array-based narrow-band optical filter is spectra interference fringes in two-dimensional spatial arrangement; and the virtually imaged phased array-based narrow-band optical filter can directly separate Mie scattering in water, Rayleigh scattering of water body molecules and water body Brillouin scattering of a water body. The virtually imaged phased array-based water body Brillouin scattering and elastic scattering lidar can be utilized to directly measure the elastic scattering and Brillouin scattering of the water body and obtain corresponding high-accuracy parameters.
Description
Technical field
The present invention relates to a kind of water body Brillouin (Brillouin) scattering based on virtual image phased array and elastic scattering laser radar, more specifically belong to a kind of laser radar measuring water Brillouin scattering and elastic scattering being narrow band optical filter with virtual image phased array.
Background technology
When after laser light incident to water body, while causing elastic scattering, the Brillouin scattering of water body can be caused.The elastic scattering of water body mainly includes rice (Mie) scattering etc. of particle in Rayleigh (Rayleigh) scattering of water body, water.The wavelength of elastic scattering is identical with incident illumination optical maser wavelength.The Rayleigh scattering live width of water body is about 1GHz, and in water, the Mie scattering live width of granule is basic identical with laser linewidth.The Brillouin scattering of water body is that incident illumination produces with phonon interaction in water.In temperature 0 ~ 40 DEG C, salinity 35 ‰ (seawater salinity) scope, the Brillouin scattering of water body is within the scope of ± 6.5GHz ~ ± 8.5GHz, and spectrum width is within the scope of 0.4GHz ~ 2GHz.
In measuring the laser radar of water Brillouin scattering and elastic scattering, it is necessary to isolate elastic scattering and the Brillouin scattering of water body, generally have following several ways at present:
1. adopt Fabry-P é rot interferometer, as adopted scan mode and using single photomultiplier tube as photodetector.This mode can be measured and obtain very fine elastic scattering and Brillouin scattering, but the time of measurement is long, is not suitable for laser radar.
2. adopt boundary filter, such as Fabry-P é rot etalon, atom or molecular filter device etc..This mode is suitable for laser radar, but can not measure elastic scattering and Brillouin scattering simultaneously, and requires that the wavelength of laser strictly mates with the characteristic of wave filter.
Summary of the invention
It is an object of the invention to provide a kind of measurement water Brillouin scattering based on virtual image phased array and elastic scattering laser radar, wherein virtual image phased array coordinates diffraction grating as narrow band optical filter.
Virtual image phased array is optical dispersion device, it is possible to be steric spectral interference striped by the line source dispersion of input.Be coupled in the diffraction grating of coupling by the spectrum that virtual image phased array exports, then what diffraction grating exported is the spectral interference striped of two-dimensional space arrangement, the corresponding optical filter of each spectral interference striped.
The present invention include narrow linewidth laser, laser frequency stabilizing system, optical emission system, optical receiving system, based on virtual image phased array narrow band optical filter, multichannel Photodetection system, Data collection and precessing system, it is characterized in that, the output wavelength of narrow linewidth laser utilizes laser frequency stabilizing system be locked in based in an interference fringe of virtual image phased array narrow band optical filter.Optical emission system is utilized in the Laser emission of frequency stabilization to tested water body, will then to utilize optical receiving system to receive water body echo, and be coupled into based in virtual image phased array narrow band optical filter.Adopted based on virtual image phased array narrow band optical filter be characterized by its Free Spectral Range less than Mie scattering spectral width in water.
In the output image plane based on virtual image phased array narrow band optical filter, place multichannel Photodetection system, the Mie scattering signal leached, Rayleigh scattering, Brillouin scattering are converted to the signal of telecommunication, and import Data collection and precessing system.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the invention will be further described.
Fig. 1, the present invention based on virtual image phased array narrow band optical filter structure chart
Fig. 2, the water Brillouin scattering based on virtual image phased array of the present invention and elastic scattering laser radar structure chart
Fig. 3, Mie scattering, water body Rayleigh scattering, water Brillouin scattering spectrum in the spectral interference striped based on virtual image phased array narrow band optical filter of the present invention and water
Fig. 4, Mie scattering, water body Rayleigh scattering, water Brillouin scattering spectrum in the water leached based on virtual image phased array narrow band optical filter of the present invention
nullIn figure: 1. the directional light of incidence，2. cylindrical mirror，3. virtual image phased array，4. auxiliary optical lens，5. diffraction grating (for flat reflective grating)，6. the spectral interference striped of the two-dimensional space arrangement at diffraction grating image plane place，7. narrow linewidth laser，8. laser frequency stabilizing system，9. optical emission system，10. optical receiving system，11. based on virtual image phased array narrow band optical filter，12. multichannel photodetection and converting system，13. Data collection and precessing system，14. the output spectrum interference fringe based on virtual image phased array narrow band optical filter，15. the optical maser wavelength keyed end of laser frequency stabilizing system，16. the Rayleigh scattering of water body，17. the Mie scattering in water，18. the Brillouin scattering (Stokes of water body，Stokes)，19. the Brillouin scattering (antiStokes of water body，Anti-Stokes)，20. the Free Spectral Range based on virtual image phased array Optical Frequency Discriminator interference fringe，21.λLMie scattering and water body Rayleigh scattering signal in the water that place leaches, the water body Stokes brillouin scattering signal that 22. leach, the water body anti-Stokes brillouin scattering signal that 23. leach.
Detailed description of the invention
It is an object of the invention to provide a kind of water Brillouin scattering based on virtual image phased array and elastic scattering laser radar, to solve the technical problem of association area.
The present invention based on virtual image phased array optical filter as shown in Figure 1.Directional light (1) incides in virtual image phased array (3) after cylindrical lens (2) focuses on.The output of virtual image phased array (3) is coupled in the diffraction grating (5) of coupling after auxiliary optical lens (4).According to practical situation, auxiliary optical lens (4) can also be not added with.Diffraction grating (5) can be transmission-type or reflective, it is possible to be concave grating or plane grating.Obtain the spectral interference striped of two-dimensional space arrangement at focal plane (6) place of diffraction grating, wherein virtual image phased array has spectral modeling dispersion in y direction, and diffraction grating has spectral modeling dispersion in x direction.
The water Brillouin scattering based on virtual image phased array of the present invention and elastic scattering laser radar are as shown in Figure 2.Narrow linewidth laser (7) is as light source, and utilizes laser frequency stabilization (8) system optical maser wavelength to be locked.Laser after frequency locking is entered in tested water body by optical emission system (9).Utilize optical receiving system (10) to receive water body backscattering signal, and import to based in virtual image phased array narrow band optical filter (11).Utilize the output based on virtual image phased array narrow band optical filter (11) that multichannel Photodetection system (12) detection is required, and import Data collection and precessing system (13).
In Fig. 3, (14) are based on the spectral interference striped of virtual image phased array narrow band optical filter output.Optical maser wavelength locking (15) place in figure 3, corresponding to based on virtual image phased array narrow band optical filter central wavelength lambdaLInterference fringe.In water body Rayleigh scattering (16) and water, the centre wavelength of the Mie scattering (17) of granule is also at (15) place.The Stokes Brillouin scattering of water body and anti-Stokes Brillouin scattering lay respectively at (15) two lateral extents and are about 7.5GHz place.
Application claims based on virtual image phased array narrow band optical filter output interference fringe Free Spectral Range less than Mie scattering spectral width in water.
Central wavelength lambda in Fig. 4LNeighbouring interference fringe can leach Mie scattering and water body Rayleigh scattering (21) in part water；Also can leach Stokes Brillouin scattering (22) and anti-Stokes Brillouin scattering (23) simultaneously.
Because the theoretical model based on virtual image phased array narrow band optical filter interference fringe is accurately known, simultaneously Mie scattering in water, water body Rayleigh scattering, water Brillouin scattering theoretical model also accurately it can be seen that so the parameter of Mie scattering in water, water body Rayleigh scattering, water Brillouin scattering can be accurately calculated respectively according to Fig. 4 (21), (22) and (23).
In a word, Fig. 2 can directly measure based on the water Brillouin scattering of virtual image phased array and elastic scattering laser radar elastic scattering scattering and the Brillouin scattering of water body, and obtain corresponding High Accuracy Parameter.
Claims (3)
1. the water Brillouin scattering based on virtual image phased array and elastic scattering laser radar, it is characterised in that: by narrow linewidth laser, laser frequency stabilizing system, optical emission system, optical receiving system, constitute based on virtual image phased array narrow band optical filter, multichannel Photodetection system, Data collection and precessing system；The output wavelength of narrow linewidth laser wherein utilize laser frequency stabilizing system be locked in based in an interference fringe of virtual image phased array narrow band optical filter；Optical emission system is utilized in the Laser emission of frequency stabilization to tested water body, will then to utilize optical receiving system to receive water body echo, and be coupled into based in virtual image phased array narrow band optical filter；In the output image plane based on virtual image phased array narrow band optical filter, place multichannel Photodetection system, rice (Mie) scattered signal leached, Rayleigh (Rayleigh) scattering, Brillouin scattering (Brillouin) are converted to the signal of telecommunication, and import Data collection and precessing system.
2. the characteristic based on virtual image phased array narrow band optical filter described in claim 1 is in that it is made up of virtual image phased array and diffraction grating, it is output as the spectral interference striped of two-dimensional space arrangement, it is possible to be directly separating in water Mie scattering, water body molecule Rayleigh scattering and water Brillouin scattering.
3. described in claim 1 based on virtual image phased array narrow band optical filter be characterized by its Free Spectral Range less than Mie scattering spectral width in water.
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Cited By (2)
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| CN111142121A (en) * | 2019-12-20 | 2020-05-12 | 自然资源部第二海洋研究所 | Brillouin scattering temperature measurement laser radar system based on two-stage virtual image phase array |
| CN112731341A (en) * | 2020-11-20 | 2021-04-30 | 自然资源部第二海洋研究所 | Dual-wavelength high spectral resolution laser radar system based on two-stage virtual image phase array |
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Cited By (3)
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| CN111142121A (en) * | 2019-12-20 | 2020-05-12 | 自然资源部第二海洋研究所 | Brillouin scattering temperature measurement laser radar system based on two-stage virtual image phase array |
| CN112731341A (en) * | 2020-11-20 | 2021-04-30 | 自然资源部第二海洋研究所 | Dual-wavelength high spectral resolution laser radar system based on two-stage virtual image phase array |
| CN112731341B (en) * | 2020-11-20 | 2022-06-10 | 自然资源部第二海洋研究所 | Dual-wavelength high spectral resolution laser radar system based on two-stage virtual image phase array |
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