CN1740817A - Stimulated Brillouin scattering laser radar underwater hidden substance detecting system and method - Google Patents
Stimulated Brillouin scattering laser radar underwater hidden substance detecting system and method Download PDFInfo
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- CN1740817A CN1740817A CN 200510010357 CN200510010357A CN1740817A CN 1740817 A CN1740817 A CN 1740817A CN 200510010357 CN200510010357 CN 200510010357 CN 200510010357 A CN200510010357 A CN 200510010357A CN 1740817 A CN1740817 A CN 1740817A
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Abstract
The present invention provides an underwater invisible body detection system based on SBS laser radar and its detection method for detecting underwater invisible body bearing and depth. Its structure includes beam-expanding system formed from pulse laser, concave lens and convex lens, isolation system composed of Polaroid and 1/4 wave plate, variable focal transmitting system and receiving system formed from concave lens and convex lens and signal detection and processing system composed of two detectors and oscilloscope.
Description
Technical field
The present invention relates to a kind of based on stimulated Brillouin scattering laser radar underwater hidden substance detecting system and method.
Background technology
At present, stealth technology all is to study on links such as target material character, surface configuration, surface coating, in the hope of weakening of the reflection of signals such as incident electromagnetic wave, light wave and sound wave to greatest extent, make echoed signal less than ambient noise signal, thereby reach stealthy purpose on the surface.Anti-stealth technololgy then mainly concentrates on how to improve detection sensitivity and signals such as the useful faint electromagnetic wave of extraction, light wave, sound wave from ground unrest.In addition, the existence of target is judged in the disappearance that a kind of new anti-stealth technololgy is based on signal, consults magazine " Applied Physics B " (Germany) 2004 the 8th phases " Detecting submergedobjects by Brillouin scattering ".This method is to utilize the disappearance of brillouin scattering signal in the water to judge the existence of object in the water, but since brillouin scattering signal a little less than, detection range is not far, and use comparatively complicated edge detection system to survey, the inconvenience that operates, therefore, practicality is relatively poor.
Summary of the invention
The objective of the invention is to propose a kind of based on the stimulated Brillouin scattering laser radar underwater hidden substance Detection Techniques, its principle is to utilize the disappearance of stimulated Brillouin scattering signal to judge the orientation of immersed body, and transmits and mistiming of echoed signal is calculated the distance of object.Improved existing anti-stealth technololgy, and had the advantage that detection range is dark, detection accuracy is high, collection emission, be received in one and simplified device.
System of the present invention formation comprises pulsed laser (1), beam splitting chip (2), concavees lens (3), convex lens (4), polaroid (5), quarter wave plate (6), concavees lens (7), convex lens (8), convex lens (9), convex lens (10), detector 1 (11), detector 2 (12), oscillograph (13) composition.Concavees lens (3) and convex lens (4) are formed elementary beam-expanding system.Polaroid (5) and quarter wave plate (6) are formed shielding system and are used to extract the light that stimulated Brillouin scattering reflects.Concavees lens (7) and convex lens (8) are formed the zoom emission coefficient, are used to converge exploring laser light.Simultaneously, because stimulated Brillouin scattering has the phase conjugation characteristic, the light that reflects will return along former road, so concavees lens (7) and convex lens (8) are also as receiving system.Convex lens (9), convex lens (10) arrive optical convergence on detector 1 (11) and the detector 2 (12).Detector 1 (11) and detector 2 (12) are surveyed laser before the emission and the stimulated Brillouin scattering light that reflects.Detector 1 (11) analyzed by oscillograph (13) and detector 2 (12) is surveyed the mistiming of launching preceding laser and the stimulated Brillouin scattering light that reflects, and therefore just can calculate the position of hidden substance.
Principle of work of the present invention:
Stimulated Brillouin scattering is a kind of optical non-linear effect, when the optical power density in the medium surpasses the stimulated Brillouin scattering threshold value, stimulated Brillouin scattering will take place.At this moment, most of pumping light will be transferred to the back on the stimulated Brillouin scattering light of transmission.And stimulated Brillouin scattering has the phase conjugation characteristic, and stimulated Brillouin scattering light will return along former road.The principle of the invention is to utilize the disappearance of stimulated Brillouin scattering signal to judge the orientation of immersed body, and transmits and mistiming of echoed signal is calculated the distance of object.Detection method of the present invention is finished by following steps: one, the light of pulsed laser (1) output is told sub-fraction by beam splitting chip (2) and is converged on the detector 1 (11) by convex lens (9); Two, several times are restrainted in the beam-expanding system expansion is made up of concavees lens (3) and convex lens (4) of the part of the light transmission beam splitting chip (2) of pulsed laser (1) output; Three, polaroid (5) and quarter wave plate (6) are formed shielding system and are used to extract the light that stimulated Brillouin scattering reflects.The signal extraction principle is: twice of emitted laser and stimulated Brillouin scattering light revolve by the quarter wave plate polarization state and turn 90 degrees, and just become reflection by original transmission when stimulated Brillouin scattering light arrives polaroid once more; Four, concavees lens (7) and convex lens (8) are to form the zoom emission coefficient, and by changing the distance between concavees lens and the convex lens, focus can be by zero to the scanning of infinite distant place; Five, when before the focus during no hidden substance, at the focus place stimulated Brillouin scattering will take place, stimulated Brillouin scattering light is owing to have the phase conjugation characteristic and will return along former road.At this moment, concavees lens (7) and convex lens (8) are as receiving system, and polaroid (5) and quarter wave plate (6) are formed shielding system and extracted the light that stimulated Brillouin scattering reflects, and convex lens (10) arrive optical convergence on the detector 2 (12); Six, when the focus scanning of the zoom system, pancreatic system that concavees lens (7) and convex lens (8) are formed is after the hidden substance, stimulated Brillouin scattering will can not take place, and detector (12) will be surveyed less than stimulated Brillouin scattering light; Seven, note the detection waveform of stimulated Brillouin scattering disappearance eve detector 1 (11) and detector 2 (12) simultaneously, detector 1 (11) analyzed by oscillograph (13) and detector 2 (12) is surveyed the mistiming of launching preceding laser and the stimulated Brillouin scattering light that reflects, and therefore just can calculate the position of immersed body.Wherein, pulsed laser (1), beam splitting chip (2), concavees lens (3), convex lens (4), polaroid (5), quarter wave plate (6), concavees lens (7), convex lens are followed successively by the light signal transmission between (8), be followed successively by the light signal transmission between beam splitting chip (2), convex lens (9), the detector 1 (11), between detector 1 (11), the oscillograph (13) is electrical signal transfer, be followed successively by the light signal transmission between polaroid (5), convex lens (10), the detector 2 (12), detector 2 (12), oscillograph are followed successively by electrical signal transfer between (13).
The present invention has the advantage that detection range is dark, detection accuracy is high, collection emission, is received in one and has simplified device, can the widespread use Yu Haiyang, the detection of immersed bodies such as lake, rivers.
Description of drawings
Fig. 1 is based on stimulated Brillouin scattering laser radar underwater hidden substance detecting system one-piece construction synoptic diagram
Embodiment
Present embodiment is with reference to accompanying drawing 1, and it is made up of injection locking Nd:YAG pulsed laser (1), beam splitting chip (2), concavees lens (3), convex lens (4), multilayer dielectric film polaroid (5), quarter wave plate (6), concavees lens (7), convex lens (8), convex lens (9), convex lens (10), PIN photodetector 1 (11), PIN photodetector 2 (12), oscillograph (13).Injection locking Nd:YAG laser instrument (1) output wavelength is that 532nm, pulsewidth are the pulse laser of 5-20ns.Concavees lens (3) and convex lens (4) are formed elementary beam-expanding system, and expanding beam ratio is 3 ~ 5 times.Multilayer dielectric film polaroid (5) and quarter wave plate (6) are formed shielding system and are used to extract the light that stimulated Brillouin scattering reflects.Concavees lens (7) and convex lens (8) are that focal distance ratio is 1: 20 ~ 1: 25 a zoom emission coefficient, are used to converge exploring laser light.Simultaneously, because stimulated Brillouin scattering has the phase conjugation characteristic, the light that reflects will return along former road, so concavees lens (7) and convex lens (8) are also as receiving system.Convex lens (9), convex lens (10) arrive optical convergence on PIN photodetector 1 (11) and the PIN photodetector 2 (12).PIN photodetector 1 (11) and PIN photodetector 2 (12) are surveyed laser before the emission and the stimulated Brillouin scattering light that reflects.PIN photodetector 1 (11) analyzed by oscillograph (13) and PIN photodetector 2 (12) is surveyed the mistiming of launching preceding laser and the stimulated Brillouin scattering light that reflects, and therefore just can calculate the position of hidden substance.
The present invention has the advantage that detection range is dark, detection accuracy is high, collection emission, is received in one and has simplified device, can the widespread use Yu Haiyang, the detection of immersed bodies such as lake, rivers.
Claims (2)
1. stimulated Brillouin scattering laser radar underwater hidden substance detecting system and method is characterized in that this system comprises pulsed laser (1), beam splitting chip (2), concavees lens (3), convex lens (4), polaroid (5), quarter wave plate (6), concavees lens (7), convex lens (8), convex lens (9), convex lens (10), detector (11), detector (12), oscillograph (13); Wherein, pulsed laser (1), beam splitting chip (2), concavees lens (3), convex lens (4), polaroid (5), quarter wave plate (6), concavees lens (7), convex lens are followed successively by the light signal transmission between (8), be followed successively by the light signal transmission between beam splitting chip (2), convex lens (9), the detector 1 (11), between detector 1 (11), the oscillograph (13) is electrical signal transfer, be followed successively by the light signal transmission between polaroid (5), convex lens (10), the detector 2 (12), detector 2 (12), oscillograph are followed successively by electrical signal transfer between (13).
2. stimulated Brillouin scattering laser radar underwater hidden substance detecting system according to claim 1 and method is characterized in that its detection method is: one, the light of pulsed laser (1) output is told sub-fraction by beam splitting chip (2) and is converged on the detector 1 (11) by convex lens (9); Two, several times are restrainted in the beam-expanding system expansion is made up of concavees lens (3) and convex lens (4) of the part of the light transmission beam splitting chip (2) of pulsed laser (1) output; Three, polaroid (5) and quarter wave plate (6) are formed shielding system and are used to extract the light that stimulated Brillouin scattering reflects.The signal extraction principle is: twice of emitted laser and stimulated Brillouin scattering light revolve by the quarter wave plate polarization state and turn 90 degrees, and just become reflection by original transmission when stimulated Brillouin scattering light arrives polaroid once more; Four, concavees lens (7) and convex lens (8) are to form the zoom emission coefficient, and by changing the distance between concavees lens and the convex lens, focus can be by zero to the scanning of infinite distant place; Five, when before the focus during no hidden substance, at the focus place stimulated Brillouin scattering will take place, stimulated Brillouin scattering light is owing to have the phase conjugation characteristic and will return along former road.At this moment, concavees lens (7) and convex lens (8) are as receiving system, and polaroid (5) and quarter wave plate (6) are formed shielding system and extracted the light that stimulated Brillouin scattering reflects, and convex lens (10) arrive optical convergence on the detector 2 (12); Six, when the focus scanning of the zoom system, pancreatic system that concavees lens (7) and convex lens (8) are formed is after the hidden substance, stimulated Brillouin scattering will can not take place, and detector (12) will be surveyed less than stimulated Brillouin scattering light; Seven, note the detection waveform of stimulated Brillouin scattering disappearance eve detector 1 (11) and detector 2 (12) simultaneously, detector 1 (11) analyzed by oscillograph (13) and detector 2 (12) is surveyed the mistiming of launching preceding laser and the stimulated Brillouin scattering light that reflects, and therefore just can calculate the position of immersed body.
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101086527B (en) * | 2007-07-11 | 2010-08-25 | 浙江大学 | Method for probing incident laser direction and signal detection device |
| CN102053073A (en) * | 2010-11-10 | 2011-05-11 | 南昌航空大学 | Method and device for measuring nitrogen brillouin scattering signal |
| CN102213763A (en) * | 2011-04-11 | 2011-10-12 | 哈尔滨工业大学 | Coherent Doppler wind measuring laser radar ranging system and method based on mode-locked laser |
| CN102243307A (en) * | 2011-04-13 | 2011-11-16 | 南昌航空大学 | Underwater detection automatic scanning system of SBS (Stimulated Brillouin Scattering) laser radar |
| CN102338875A (en) * | 2010-07-16 | 2012-02-01 | 李少勤 | Multi-spectral scanning foresight anti-collision laser radar device and application thereof |
| CN102347587A (en) * | 2010-08-02 | 2012-02-08 | 南昌航空大学 | Stimulated Brillouin scattering generation method |
| CN102347586A (en) * | 2010-08-02 | 2012-02-08 | 南昌航空大学 | Method for generating stimulated Brillouin scattering by solid laser amplifier |
| CN103954968A (en) * | 2014-04-18 | 2014-07-30 | 宁波镭基光电技术有限公司 | System and method for laser radar monitoring in early-stage fire warning |
| EP3153879A1 (en) * | 2015-10-07 | 2017-04-12 | Topcon Corporation | Electro-optical distance measuring instrument |
| CN106569224A (en) * | 2016-10-31 | 2017-04-19 | 长春理工大学 | Scanning-type laser radar optical system |
| CN109073777A (en) * | 2018-07-25 | 2018-12-21 | 合刃科技（深圳）有限公司 | A kind of hidden substance detecting system and method |
| CN109143202A (en) * | 2018-09-21 | 2019-01-04 | 南昌航空大学 | A kind of stimulated Brillouin scattering laser radar system and device under simulation oceanic turbulence |
| CN110702209A (en) * | 2019-10-18 | 2020-01-17 | 南昌航空大学 | Device and method for measuring stimulated Brillouin scattering process based on cavity optomechanics system |
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| CN108008372B (en) * | 2017-12-12 | 2021-10-22 | 北京航天计量测试技术研究所 | Focusing type laser ranging receiving optical system |
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| DE4206499C2 (en) * | 1992-03-02 | 1994-03-10 | Haeusler Gerd | Distance measuring method and device |
| CN1292878A (en) * | 1998-03-10 | 2001-04-25 | 西门子公司 | Optical sensor system for detecting position of object |
| FR2867619B1 (en) * | 2004-03-12 | 2006-06-23 | Thales Sa | FREQUENCY OFFSET DEVICE IN A PULSED LASER SOURCE OPTICAL PATH |
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| CN101086527B (en) * | 2007-07-11 | 2010-08-25 | 浙江大学 | Method for probing incident laser direction and signal detection device |
| CN102338875B (en) * | 2010-07-16 | 2013-12-04 | 李少勤 | Multi-spectral scanning foresight anti-collision laser radar device and application thereof |
| CN102338875A (en) * | 2010-07-16 | 2012-02-01 | 李少勤 | Multi-spectral scanning foresight anti-collision laser radar device and application thereof |
| CN102347587A (en) * | 2010-08-02 | 2012-02-08 | 南昌航空大学 | Stimulated Brillouin scattering generation method |
| CN102347586A (en) * | 2010-08-02 | 2012-02-08 | 南昌航空大学 | Method for generating stimulated Brillouin scattering by solid laser amplifier |
| CN102347586B (en) * | 2010-08-02 | 2013-01-09 | 南昌航空大学 | Method for generating stimulated Brillouin scattering by solid laser amplifier |
| CN102053073A (en) * | 2010-11-10 | 2011-05-11 | 南昌航空大学 | Method and device for measuring nitrogen brillouin scattering signal |
| CN102213763A (en) * | 2011-04-11 | 2011-10-12 | 哈尔滨工业大学 | Coherent Doppler wind measuring laser radar ranging system and method based on mode-locked laser |
| CN102243307A (en) * | 2011-04-13 | 2011-11-16 | 南昌航空大学 | Underwater detection automatic scanning system of SBS (Stimulated Brillouin Scattering) laser radar |
| CN103954968A (en) * | 2014-04-18 | 2014-07-30 | 宁波镭基光电技术有限公司 | System and method for laser radar monitoring in early-stage fire warning |
| EP3153879A1 (en) * | 2015-10-07 | 2017-04-12 | Topcon Corporation | Electro-optical distance measuring instrument |
| US10422861B2 (en) | 2015-10-07 | 2019-09-24 | Topcon Corporation | Electro-optical distance measuring instrument |
| CN106569224A (en) * | 2016-10-31 | 2017-04-19 | 长春理工大学 | Scanning-type laser radar optical system |
| CN106569224B (en) * | 2016-10-31 | 2019-04-26 | 长春理工大学 | A kind of sweep type laser radar optical system |
| CN109073777A (en) * | 2018-07-25 | 2018-12-21 | 合刃科技（深圳）有限公司 | A kind of hidden substance detecting system and method |
| CN109143202A (en) * | 2018-09-21 | 2019-01-04 | 南昌航空大学 | A kind of stimulated Brillouin scattering laser radar system and device under simulation oceanic turbulence |
| CN109143202B (en) * | 2018-09-21 | 2022-08-26 | 南昌航空大学 | Stimulated Brillouin scattering laser radar system device under simulated ocean turbulence |
| CN110702209A (en) * | 2019-10-18 | 2020-01-17 | 南昌航空大学 | Device and method for measuring stimulated Brillouin scattering process based on cavity optomechanics system |
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