CN109143202B - Stimulated Brillouin scattering laser radar system device under simulated ocean turbulence - Google Patents
Stimulated Brillouin scattering laser radar system device under simulated ocean turbulence Download PDFInfo
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- CN109143202B CN109143202B CN201811105711.XA CN201811105711A CN109143202B CN 109143202 B CN109143202 B CN 109143202B CN 201811105711 A CN201811105711 A CN 201811105711A CN 109143202 B CN109143202 B CN 109143202B
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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
- G01S7/483—Details of pulse systems
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M10/00—Hydrodynamic testing; Arrangements in or on ship-testing tanks or water tunnels
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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
- G01S7/497—Means for monitoring or calibrating
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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
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- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
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Abstract
The invention discloses a stimulated Brillouin scattering laser radar system device for simulating ocean turbulence, which comprises a seed injection type solid pulse laser, a beam polarization system, a focusing system, a turbulence generation system, a collimation system, an F-P etalon, an ICCD and a computer. The stimulated Brillouin scattering radar system is combined with the turbulence generation system, so that the influence of ocean turbulence on the stimulated Brillouin scattering laser radar is explored, and the method has important significance for better application of stimulated Brillouin scattering to deep sea detection.
Description
Technical Field
The invention relates to an optical simulation detection system, in particular to a stimulated Brillouin scattering laser radar system device for simulating ocean turbulence.
Background
Turbulence is an unstable, complex flow state of a fluid, also referred to as turbulence. In the prior art, when a simulated detection experiment is carried out, a large number of parameters of a water body are considered, such as the influence of ocean environment parameters such as temperature, salinity and viscosity number on a detection signal, and the ocean turbulence effect is hardly considered when the ocean detection experiment is carried out because the ocean turbulence effect is difficult to control. The ocean turbulence is high-frequency random motion which is ubiquitous in the ocean, and the simulation of the ocean turbulence motion and the application of the simulation to an underwater target detection experiment have important significance for target detection under the ocean turbulence effect. The turbulence has obvious influence on the movement speed and salinity characteristics of seawater and the dissolved state in water, the influence of the turbulence movement on the aspect of stimulated Brillouin scattering laser radar is researched, an ocean simulation model can be better established, and more accurate target detection in the ocean is facilitated.
Disclosure of Invention
The invention aims to solve the problems that: provides a stimulated Brillouin scattering laser radar system device for simulating ocean turbulence, which combines a stimulated Brillouin scattering radar system and a turbulence generation system to explore the influence of the ocean turbulence on the stimulated Brillouin scattering laser radar,
the technical scheme provided by the invention for solving the problems is as follows: a stimulated Brillouin scattering laser radar system device under simulated ocean turbulence comprises a seed injection type solid pulse laser, a beam polarization system, a focusing system, a turbulence generation system, a collimation system, an F-P etalon, an ICCD and a computer;
the seed injection type solid pulse laser emits laser beams, the laser beams are emitted into a beam polarization system, and the beam polarization system is used for changing vertical polarized light emitted from the seed injection type solid pulse laser into horizontal polarized light and then changing the polarization state by 45 degrees;
the focusing system is used for focusing the laser beam emitted from the light beam polarization system to form stimulated Brillouin scattering, and the laser beam is focused into the turbulence generation system, the turbulence generation system can generate a turbulence effect, and the turbulence effect can influence the stimulated Brillouin scattering;
the light beam polarization system can also change the polarization state of the stimulated Brillouin scattering reflected from the turbulent flow system to enter the collimation system;
the collimation system has the function of converting scattered light into horizontal light and can convert scattered light beams emitted from the light beam polarization system into horizontal light beams; the F-P etalon is used for splitting the horizontal light beam, the ICCD is used for receiving the horizontal light beam split by the F-P etalon, and the computer is used for receiving and displaying a spectrogram transmitted by the ICCD.
Preferably, the light beam polarization system includes a glan prism, a λ/2 wave plate and a quartz wafer, which are sequentially arranged, the glan prism is highly transparent to the horizontally polarized light, and highly reflective to the vertically polarized light, the vertical polarized light is deflected by 90 ° in the propagation direction after passing through the glan prism, the λ/2 wave plate can change the vertically polarized light into the horizontally polarized light, and the quartz wafer can change the polarization state of the laser beam by 45 °.
Preferably, the focusing system comprises a first concave lens and a first convex lens which are arranged in sequence according to the direction of the light beam emitted by the light beam polarization system.
Preferably, the turbulence generating system comprises a 100-meter long water pool, a submersible axial-flow pump and a plurality of porous aluminum plates, wherein the plurality of porous aluminum plates are vertically arranged in the 100-meter long water pool, and the submersible axial-flow pump is arranged in the 100-meter long water pool.
Preferably, the collimating system comprises a second concave lens, a second convex lens, a third convex lens and a pinhole filter which are sequentially arranged according to the direction of the scattered light emitted by the beam polarizing system.
Preferably, the focal length of the second convex lens is smaller than the distance from the second concave lens to the second convex lens.
Preferably, a pulse delay generator DG535 is also included, said pulse delay generator DG535 being used to control the timing of said seed-injected solid state pulse laser and ICCD.
Compared with the prior art, the invention has the advantages that: the deep sea turbulence effect can be simulated, the target detection is carried out under the simulated deep sea turbulence effect, and the method is more approximate to the real marine environment, so that the detection technology of the laser radar in the sea is higher in practicability.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.
FIG. 1 is a block diagram of the overall system of the present invention;
the attached drawings are marked as follows: : 1. the device comprises a seed injection type solid pulse laser, 2, a Glan prism, 3, a lambda/2 wave plate, 4, a quartz wafer, 5, a focusing system, 6 and 100 meters of long water tanks, 7, a multilayer aluminum plate, 8, a submersible axial flow pump, 9, a collimation system, 10, an F-P etalon, 11, an ICCD, 12, pulse delay generators DG535 and 13, a computer, 14, a first concave lens, 15, a first convex lens, 16, a pinhole filter, 17, a third convex lens, 18, a second convex lens, 19 and a second concave lens.
Detailed Description
The following detailed description of the embodiments of the present invention will be provided with reference to the accompanying drawings and examples, so that how to implement the embodiments of the present invention by using technical means to solve the technical problems and achieve the technical effects can be fully understood and implemented.
The embodiment of the invention is shown in fig. 1, and the stimulated brillouin scattering lidar system device for simulating ocean turbulence comprises a seed injection type solid pulse laser 1, a beam polarization system, a focusing system 5, a turbulence generation system, a collimation system 9, an F-P etalon 10, an ICCD11 and a computer 13; the seed injection type solid pulse laser 1 emits laser beams, the laser beams are emitted into a beam polarization system, and the beam polarization system is used for changing vertical polarized light emitted from the seed injection type solid pulse laser 1 into horizontal polarized light and then changing the polarization state by 45 degrees; the focusing system 5 is used for focusing the laser beam emitted from the beam polarization system to form stimulated Brillouin scattering, and focusing the laser beam into the turbulence generation system, wherein the turbulence generation system can generate a turbulence effect, and the turbulence effect can influence the stimulated Brillouin scattering; the light beam polarization system can also change the polarization state of the stimulated Brillouin scattering reflected from the turbulent flow system, so that the stimulated Brillouin scattering enters the collimation system; the collimating system 9 has the function of converting scattered light into horizontal light, and can convert scattered light beams emitted from the light beam polarizing system into horizontal light beams; the F-P etalon 10 is used to split the horizontal beam, the ICCD11 is used to receive the horizontal beam split by the F-P etalon 10, and the computer is used to receive and display the spectrum transmitted through the ICCD 11.
The light beam polarization system comprises a Glan prism 2, a lambda/2 wave plate 3 and a quartz wafer 4 which are sequentially arranged, the Glan prism 2 is highly transparent to horizontal polarized light, and highly reflective to vertical polarized light, the vertical polarized light is deflected by 90 degrees in the transmission direction after passing through the Glan prism 2, the lambda/2 wave plate 3 can change the vertical polarized light into the horizontal polarized light, and the quartz wafer 4 can change the polarization state of a laser beam by 45 degrees.
The focusing system 5 comprises a concave lens 14 and a convex lens 15 which are arranged in sequence according to the direction of the light beam emitted by the light beam polarization system.
The turbulence generation system comprises a 100-meter long water pool 6, a submersible axial-flow pump 8 and a plurality of porous aluminum plates 7, wherein the porous aluminum plates 7 are vertically arranged in the 100-meter long water pool 6, and the submersible axial-flow pump 8 is arranged in the 100-meter long water pool 6; the submersible axial-flow pump can run underwater, generates wave flow, can be started quickly, can convey liquid at the maximum temperature of 40 ℃, and can realize remote control and automatic control. The porous aluminum plate can more uniformly disperse the generated wave flow, thereby sufficiently disturbing the fluid; put into polylith porous aluminum plate in 100 meters pond, put into dive axial-flow pump at the aluminum plate opposite side, the combination has constituted a simple torrent and has produced the system, when dive axial-flow pump during operation, produces the wave flow, and these wave flows behind polylith porous aluminum plate, and the velocity of flow of wave flow is accelerated, reaches certain reynolds number after, and the flow state is extremely unstable, and after the flow continues the increase, just can produce the torrent.
The collimating system 9 includes a second concave lens 19, a second convex lens 18, a third convex lens 17, and a pinhole filter 16, which are sequentially arranged according to the direction of the scattered light emitted by the beam polarizing system.
And the focal length of the second convex lens 18 is smaller than the distance from the second concave lens 19 to the second convex lens 18.
Also included is pulse delay generator DG53512, which pulse delay generator DG53512 is used to control the timing of seed-injected solid state pulse laser 1 and ICCD 11.
The specific working process of the invention is as follows: the specific process is that a 532nm laser beam is emitted by a seed injection type solid pulse laser, after passing through a Glan prism, the laser beam deflects by 90 degrees, the deflected laser passes through a lambda/2 wave plate and is converted from vertical polarized light into horizontal polarized light, the horizontal polarized light enters a focusing system through a quartz wafer, a turbulence generation system consisting of a porous multilayer aluminum plate and a submersible axial-flow pump exists in a 100-meter water pool and can generate a turbulence effect, stimulated Brillouin scattering generated in water by the laser beam passing through the focusing system can be influenced by the turbulence effect, then a stimulated Brillouin scattering signal in the turbulence system can propagate along the reverse direction of the incident direction, passes through the quartz wafer and the lambda/2 wave plate, passes through the Glan prism, enters a collimating system, is subjected to F-P etalon light splitting and then is recorded by ICCD, and a spectrogram is displayed on a computer, the timing of the seed-injected solid-state pulse laser and the ICCD is precisely controlled by pulse delay generator DG 535.
The invention has the beneficial effects that: the deep sea turbulence effect can be simulated, the target detection is carried out under the simulated deep sea turbulence effect, and the method is more approximate to the real marine environment, so that the detection technology of the laser radar in the sea is higher in practicability.
The foregoing is illustrative of the preferred embodiments of the present invention only and is not to be construed as limiting the claims. The present invention is not limited to the above embodiments, and the specific structure thereof is allowed to vary. All changes which come within the scope of the invention as defined by the independent claims are intended to be embraced therein.
Claims (7)
1. The utility model provides a stimulated brillouin scattering laser radar system device under simulation ocean torrent which characterized in that: the device comprises a seed injection type solid pulse laser, a beam polarization system, a focusing system, a turbulence generation system, a collimation system, an F-P etalon, an ICCD and a computer;
the seed injection type solid pulse laser emits laser beams, the laser beams are emitted into a beam polarization system, and the beam polarization system is used for changing vertical polarized light emitted from the seed injection type solid pulse laser into horizontal polarized light and then changing the polarization state by 45 degrees;
the focusing system is used for focusing the laser beam emitted from the light beam polarization system to form stimulated Brillouin scattering, and the laser beam is focused into the turbulence generation system, the turbulence generation system can generate a turbulence effect, and the turbulence effect can influence the stimulated Brillouin scattering;
the light beam polarization system can also change the polarization state of the stimulated Brillouin scattering reflected from the turbulent flow system to enter the collimation system;
the collimation system has the function of converting scattered light into horizontal light and can convert scattered light beams emitted from the light beam polarization system into horizontal light beams; the F-P etalon is used for splitting the horizontal light beam, the ICCD is used for receiving the horizontal light beam split by the F-P etalon, and the computer is used for receiving and displaying a spectrogram transmitted by the ICCD.
2. The stimulated brillouin scattering lidar system device for simulating ocean turbulence according to claim 1, wherein: the light beam polarization system comprises a Glan prism, a lambda/2 wave plate and a quartz wafer which are sequentially arranged, the Glan prism is highly transparent to horizontal polarized light and highly reflective to vertical polarized light, the vertical polarized light is deflected by 90 degrees in the transmission direction after passing through the Glan prism, the lambda/2 wave plate can change the vertical polarized light into the horizontal polarized light, and the quartz wafer can change the polarization state of a laser beam by 45 degrees.
3. The stimulated brillouin scattering lidar system device for simulating ocean turbulence according to claim 1, wherein: the focusing system comprises a first concave lens and a first convex lens which are sequentially arranged according to the direction of the light beam emitted by the light beam polarizing system.
4. The stimulated brillouin scattering lidar system device for simulating ocean turbulence according to claim 1, wherein: the turbulence generation system comprises a 100-meter long water pool, a submersible axial-flow pump and a plurality of porous aluminum plates, wherein the porous aluminum plates are vertically arranged in the 100-meter long water pool, and the submersible axial-flow pump is arranged in the 100-meter long water pool.
5. The stimulated brillouin scattering lidar system device for simulating ocean turbulence according to claim 1, wherein: the collimation system comprises a second concave lens, a second convex lens, a third convex lens and a pinhole filter which are sequentially arranged according to the direction of scattered light emitted by the light beam polarization system.
6. The stimulated brillouin scattering lidar system device for simulating ocean turbulence according to claim 5, wherein: and the focal length of the second convex lens is smaller than the distance from the second concave lens to the second convex lens.
7. The stimulated brillouin scattering lidar system device for simulating ocean turbulence according to claim 1, wherein: also included is pulse delay generator DG535, which pulse delay generator DG535 is used to control the timing of the seed-injected solid state pulse laser and ICCD.
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| CN110161486B (en) * | 2019-07-03 | 2023-09-01 | 南昌航空大学 | Device for testing laser radar lens performance |
| CN110672566A (en) * | 2019-10-18 | 2020-01-10 | 南昌航空大学 | Method for detecting stimulated Brillouin scattering acoustic photonic crystal structure in water |
| CN110673157B (en) * | 2019-11-07 | 2021-07-16 | 自然资源部第二海洋研究所 | High spectral resolution laser radar system for detecting ocean optical parameters |
| CN111142121B (en) * | 2019-12-20 | 2022-04-08 | 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 |
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