CN102243307A - Underwater detection automatic scanning system of SBS (Stimulated Brillouin Scattering) laser radar - Google Patents
Underwater detection automatic scanning system of SBS (Stimulated Brillouin Scattering) laser radar Download PDFInfo
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- CN102243307A CN102243307A CN2011100926073A CN201110092607A CN102243307A CN 102243307 A CN102243307 A CN 102243307A CN 2011100926073 A CN2011100926073 A CN 2011100926073A CN 201110092607 A CN201110092607 A CN 201110092607A CN 102243307 A CN102243307 A CN 102243307A
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Abstract
The invention discloses an underwater detection automatic scanning system of an SBS (Stimulated Brillouin Scattering) laser radar. In order to be convenient for developing anti stealth detection advantages of the SBS laser radar in actual practice, the underwater detection automatic scanning system can be arranged on the bottom of a ship, is used for completing automatic scanning underwater, solves the problems of complex manual experiment and difficulty in holding detection precision, and eliminates water surface reflection influence of light, brought from water surface incidence in the experiment. A detection method is mainly characterized in that: the whole light path and an electric control platform are integrated in a closed container which comprises metal and glass, the light path direction and the focusing position of laser underwater are controlled by a controller, and laser energy and data acquisition are controlled, thus detection and scanning of the laser radar are achieved. According to the invention, operation portability and detection precision are effectively improved; and the underwater detection automatic scanning system is conveniently applied to practical underwater detection.
Description
Technical field
The invention belongs to immersed body Detection Techniques field, particularly relate to the technical field of the employing Brillouin Scattering detection of immersed body.
Background technology
The ocean laser radar system has passed through the development of several generations, the technical maturation that has been tending towards, and its relative merits are also very obvious.Traditional ocean laser radar system, the method for the immersed body of its detection all is the reflected signal in direct detection object or seabed, belongs to amplitude and surveys.Brillouin ocean laser radar system has been broken through this tradition, the means of utilizing frequency modulation to survey, the echoed signal of direct detection water body itself, by analysis to this signal, having or not of recognition object, and then determine its degree of depth, and can further obtain more information by scanning.This detection method makes that at present any stealth technology at the amplitude detection is all inoperative.Yet, laser radar system practical manifestation based on spontaneous brillouin scattering is more general, its main cause is, increased crosstalking of different depth echoed signal from the uncontrollability of signaling, make that the range resolution of surveying is relatively poor, and undressed high-energy single longitudinal mode laser directly contacts with water body, closely just may produce very strong stimulated Brillouin scattering (SBS), causes the effective propagation path under water of laser to shorten.
By careful theoretical analysis and experiment, the big laser radar system that proposes also successfully to have developed based on SBS of Beijing Normal University and Nanchang boat.This system uses the convergence light path that incident laser is converged at designated depth, because the threshold property of SBS, only SBS just can take place near convergent point, and position does not before have the SBS signal, thereby has obtained good depth resolution.On the other hand, be in the time of the firm entry of superlaser and expand the pencil attitude, its power density is not high, thereby has avoided unnecessary nonlinear effect to bring extra energy loss.
But experimental implementation is very numerous and diverse, and manual operation is difficult to reach high precision, high efficiency automatic real-time detection, and investigative range is limited, and the interference that can not effectively stop the reflection of the water surface to bring.
Summary of the invention
The present invention be directed to above-mentioned the deficiencies in the prior art, developed one and overlapped the SBS laser radar apparatus that to finish automatic detection and scanning.
This device mainly comprises: 1, catoptron 2, polaroid 3,1/4th slides 4, concavees lens 5, convex lens 6, displacement platform 7, big turntable 8, container (material is metal and glass) 9, reinforcing bar 10, fixed support 11, glass 12, catoptron
Realize surveying automatically and scanning experiment except this covering device, also have: 1, the software and hardware of pc machine 2, time sequence control device (pulse delay generator DG535) 3, YAG pulsed laser 4, signals collecting and receiving trap (the F-P etalon of seminar's development, data collecting card, enhancement mode CCD) 5, scanning monitor
The principle of work of SBS laser radar is the existence that has or not to come judgment object by the SBS signal.The present invention is integrated in the container surveying light path and scanning former device, can reach under water with convenient, is installed in the bottom of ship, comes control device by controller, in conjunction with the light source and the receiving trap of ship the inside, brings into play function of radar in addition.
The place of described device most critical is to stretch into whole device under water, and scanning accuracy requires very high, illustrate in conjunction with figure, in cuboid container, earlier catoptron, polaroid, / 4th slides are aimed at light path, live at the container internal fixation, and then fix a big turntable in the container bottom, a catoptron is fixed by turntable central authorities, and a side is slide unit fixedly, anchor lens (focal length is optional) on the slide unit, convex lens (focal length is optional) are fixed in the place ahead of concavees lens, and concavees lens and convex lens combination are by changing both relative positions, change the position of focus in water, the imaging formula of lens combination is:
f
1Be the focal length of concavees lens, f
2Be the focal length of convex lens, d
1Be the distance of two lens, d
2Be the position distance of lens combination imaging, come d by changing
1Change d
2
Big turntable can be finished the rotation of 360 degree, come the drive lens group rotation, finish 360 ° scanning, the material of container mainly is metal and glass, the effect of glass is exactly for printing opacity, below the parallel position of lens combination, surround with glass around the container, glass can not sustain the weight of big turntable and slide unit, thus must be high with the reinforcing bar welding four of rectangular parallelepiped, surround with seal glass again, guarantee printing opacity, therefore the very difficult processing of circular glass can use four flat glasss, so four of container blind areas that the higher position is scanning.
As for the accuracy requirement of scanning, mainly realize by the software and hardware of control.
Master controller needs a high performance chip of stablizing, and therefore the digital processing unit TMS320SF2812 of TI company is used in decision, is responsible for finishing the processing of external signal, the computing and the realization of the output of the drive signal of motor and The whole control algorithm
Inverse changing driving circuit is motor-driven pith, and what power driving circuit adopted is become by separation components and parts masters such as MOSFET power switch pipes
Position transducer is the core of control system feedback channel, and the position transducer of drive motor adopts the absolute light photoelectric coder, and the position transducer of small electromotor then adopts incremental optical-electricity encoder.
Designed a current detection circuit and detected the size of current of direct current survey bus in the actual moving process, and overcurrent protection function is provided
The software aspect adopts classical digital PID control algolithm, can satisfy closed-loop control, thereby precision has had assurance.
Precision index of the present invention:
Scan angle scope: 0 °～360 °;
Angular velocity (adjustable):＞5 °/s;
Horizontal range (can change): just be decided to be 3m～200m according to the focal length of lens;
Turntable rotational variations＜5 ';
Description of drawings
Fig. 1: systematic schematic diagram
Fig. 2: glass rectangular parallelepiped
Fig. 3: displacement slide unit
Fig. 4: big turntable
Embodiment
Each label among Fig. 1: 1, catoptron 2, polaroid 3,1/4th slides 4, concavees lens 5, convex lens 6, displacement platform 7, big turntable 8, container 9, reinforcing bar 10, fixed support 11, glass 12, catoptron
At first carry out experiment and prepare, present embodiment regulates light path with reference to Fig. 1, and container stretches in the water, pc machine and sequential control DG535 link, output channel link laser instrument and the ICCD of DG535.
At first do light source by the YAG pulse laser, the laser works pattern is a single longitudinal mode, and live width is about 90MHz, our usefulness be two frequency multiplication 532nm, the monopulse maximum output energy is the 1.5J/ pulse, pulse repetition rate is 10Hz, pulse width is 8ns, and live width is 0.003cm-1.In conjunction with Fig. 1, behind the YAG pulsed laser outgoing laser beam process catoptron (1), by polaroid (2), and then become circularly polarized light by 1/4th slides (3), inject again and be fixed on the catoptron on (7) (12) on the big turntable, light beam is reflected on the focusing system of concavees lens (4) and convex lens (5) composition, focusing system makes described exploring laser light bundle see through glass (11) and focuses on the given degree of depth of controller, the SBS signal beams that produces at this investigation depth place returns along former road, described SBS signal beams becomes parallel beam again by convex lens (5) and concavees lens (4) successively, and then once become orthogonal polarized light by 1/4th slides (3), this orthogonal polarized light is polarized sheet (2) and reflexes on the F-P etalon, detection is formed in this F-P etalon and ICCD sealing, handle and receive the stimulated Brillouin scattering light spectra system, and this spectrum is presented on the pc by circular, and what show on the pc machine is exactly result of detection.Controller control slide unit (6) motion, a given depth of focus, such as sending 50m, lens combination just can make light pool focus at parallel direction 50m place, because the threshold property of SBS, only SBS just can take place near convergent point, controller sends the big turntable (7) of instruction to bottom simultaneously, fixing a catoptron (12) and whole focusing above the big turntable makes up and (comprises motion slide unit (6), concavees lens (4), convex lens (5)), catoptron (12) can guarantee the light path aligning, big turntable (7) is done rotation, thereby finish 360 ° scanning, horizontal range is set at 3～200m, can come setting range by the focal length that changes concavees lens (4) and convex lens (5) as requested.
Thereby change the underwater focus of laser, controller is controlled the rotation of big turntable (7) simultaneously, changes the direction of propagation of light, makes sweep limit expand to 0～360 °.
Claims (5)
1.SBS laser radar undersea detection automatic scanning system comprises: pc machine, scanning monitor, YAG pulsed laser, F-P etalon, ICCD, catoptron (1), polaroid (2), 1/4th slides (3), concavees lens (4), convex lens (5), displacement platform (6), big turntable (7), container (8), reinforcing bar (9), fixed support (10), glass (11), catoptron (12)
Behind the YAG pulsed laser outgoing laser beam process catoptron (1), by polaroid (2), and then become circularly polarized light by 1/4th slides (3), inject again and be fixed on the catoptron on (7) (12) on the big turntable, light beam is reflected on the focusing system of concavees lens (4) and convex lens (5) composition, focusing system makes described exploring laser light bundle see through glass (11) and focuses on the given degree of depth of pc machine, the SBS signal beams that produces at this investigation depth place returns along former road, described SBS signal beams becomes parallel beam again by convex lens (5) and concavees lens (4) successively, and then once become orthogonal polarized light by 1/4th slides (3), this orthogonal polarized light is polarized sheet (2) and reflexes on the F-P etalon, detection is formed in this F-P etalon and ICCD sealing, handle and receive the stimulated Brillouin scattering light spectrum, and this spectrum is presented on the pc by circular, and what show on the pc machine is exactly result of detection.Controller control slide unit (6) motion, a given depth of focus, thus changing the underwater focus of laser, controller is controlled the rotation of big turntable (7) simultaneously, changes the direction of propagation of light, makes sweep limit expand to 0～360 °.
2. SBS laser radar undersea detection automatic scanning system as claimed in claim 1, it is characterized in that: can be based on SBS laser acquisition principle, light path and an automatically controlled closed container (8) lining that is partially integrated in, finish autoscan under water, improved the portability and the detection accuracy of operation greatly.
3. SBS laser radar undersea detection automatic scanning system as claimed in claim 1, it is characterized in that: controller chip adopts the digital processing unit TMS320SF2812 of TI company, be responsible for finishing the processing of external signal and the computing and the realization of The whole control algorithm, control algolithm adopts pid control algorithm, The whole control forms closed-loop control, and precision can satisfy the high request of detection fully.
4. SBS laser radar undersea detection automatic scanning system as claimed in claim 1, it is characterized in that: optical source wavelength is 532nm, and pulsed frequency is 10 pulses of per second, and pulsewidth is 6～10ns.
5. SBS laser radar undersea detection automatic scanning system as claimed in claim 1, its characteristic is: the Free Spectral Range of F-P etalon is 18.5～20GHz, the wide 5mm of incidence window, the incident angle of light is about 1.6 °.
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Cited By (9)
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| CN104345038A (en) * | 2014-11-20 | 2015-02-11 | 南昌航空大学 | Salt solution concentration detection method based on brillouin scattering |
| CN104568846A (en) * | 2015-01-15 | 2015-04-29 | 南昌航空大学 | Two-dimensional scan detection method for sea water halocline based on brillouin scattering |
| CN104614348A (en) * | 2015-02-04 | 2015-05-13 | 南昌航空大学 | Three-dimensional remote sensing detection method for marine water quality |
| CN104977275A (en) * | 2015-07-15 | 2015-10-14 | 南昌航空大学 | OCT imaging device in SBS ultrasonic field excitation and imaging method of OCT imaging device |
| CN105938233A (en) * | 2016-05-23 | 2016-09-14 | 湖北久之洋红外系统股份有限公司 | Infrared automatic focusing system and rapid automatic focusing method |
| CN104359839B (en) * | 2014-11-20 | 2017-01-04 | 南昌航空大学 | A kind of method for quick of waste oil |
| CN108051108A (en) * | 2017-11-30 | 2018-05-18 | 华中科技大学鄂州工业技术研究院 | A kind of seawater temp measuring system and method based on low pulse energy Gao Zhongying laser |
| CN108267727A (en) * | 2018-02-01 | 2018-07-10 | 中国工程物理研究院电子工程研究所 | A kind of underwater laser circumferential scanning detection device and system |
| CN110501689A (en) * | 2019-09-24 | 2019-11-26 | 中国工程物理研究院电子工程研究所 | A kind of underwater laser circumferential scanning beam delivery system |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104345038A (en) * | 2014-11-20 | 2015-02-11 | 南昌航空大学 | Salt solution concentration detection method based on brillouin scattering |
| CN104359839B (en) * | 2014-11-20 | 2017-01-04 | 南昌航空大学 | A kind of method for quick of waste oil |
| CN104568846B (en) * | 2015-01-15 | 2017-02-22 | 南昌航空大学 | Two-dimensional scan detection method for sea water halocline based on brillouin scattering |
| CN104568846A (en) * | 2015-01-15 | 2015-04-29 | 南昌航空大学 | Two-dimensional scan detection method for sea water halocline based on brillouin scattering |
| CN104614348A (en) * | 2015-02-04 | 2015-05-13 | 南昌航空大学 | Three-dimensional remote sensing detection method for marine water quality |
| CN104614348B (en) * | 2015-02-04 | 2017-02-22 | 南昌航空大学 | Three-dimensional remote sensing detection method for marine water quality |
| CN104977275A (en) * | 2015-07-15 | 2015-10-14 | 南昌航空大学 | OCT imaging device in SBS ultrasonic field excitation and imaging method of OCT imaging device |
| CN104977275B (en) * | 2015-07-15 | 2017-07-21 | 南昌航空大学 | A kind of OCT image device and method under the ultrasonic field excitation of SBS |
| CN105938233A (en) * | 2016-05-23 | 2016-09-14 | 湖北久之洋红外系统股份有限公司 | Infrared automatic focusing system and rapid automatic focusing method |
| CN105938233B (en) * | 2016-05-23 | 2019-10-29 | 湖北久之洋红外系统股份有限公司 | A kind of infrared autofocus system and fast automatic focusing method |
| CN108051108A (en) * | 2017-11-30 | 2018-05-18 | 华中科技大学鄂州工业技术研究院 | A kind of seawater temp measuring system and method based on low pulse energy Gao Zhongying laser |
| CN108267727A (en) * | 2018-02-01 | 2018-07-10 | 中国工程物理研究院电子工程研究所 | A kind of underwater laser circumferential scanning detection device and system |
| CN108267727B (en) * | 2018-02-01 | 2022-04-01 | 中国工程物理研究院电子工程研究所 | Underwater laser circumferential scanning detection device and system |
| CN110501689A (en) * | 2019-09-24 | 2019-11-26 | 中国工程物理研究院电子工程研究所 | A kind of underwater laser circumferential scanning beam delivery system |
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Application publication date: 20111116 |