CN104914448A - Range resolution active atmospheric turbulence laser radar system based on differential image motion method - Google Patents
Range resolution active atmospheric turbulence laser radar system based on differential image motion method Download PDFInfo
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- CN104914448A CN104914448A CN201510334024.5A CN201510334024A CN104914448A CN 104914448 A CN104914448 A CN 104914448A CN 201510334024 A CN201510334024 A CN 201510334024A CN 104914448 A CN104914448 A CN 104914448A
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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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Abstract
The invention discloses a range resolution active atmospheric turbulence laser radar system based on a differential image motion method, which comprises a laser focusing emission system and an optical receiving system, wherein the laser focusing emission system comprises a laser, an emission reflector group, a beam-spreading emission system and a scanning plane mirror, laser emitted by the laser sequentially passes through the emission reflector group and the beam-spreading emission system and then enters the scanning plane mirror, and the scanning plane mirror transmits signals to the air; and the optical receiving system comprises an off-axis receiving system, a calibration system and an ICCD camera, reflection signals of the signals transmitted by the scanning plane mirror to the air are reflected to the scanning plane mirror, received by the off-axis receiving system, processed by the calibration system and then received by the camera. According to the system disclosed by the invention, the optical path is simplified, and the optical efficiency is high.
Description
Technical field
The present invention relates to laser remote sensing, atmospheric exploration, photodetection field, particularly relate to a kind of Range resolution based on the Differential Image method of movement initiatively atmospheric turbulence laser radar system.
Background technology
Traditional atmospheric turbulence monitoring equipment is generally Differential Image motion detector (DIMM), and DIMM system, by the passive detection to natural star imaging, is measured the integrating effect of the turbulent flow on whole air path, do not had Range resolution characteristic.And adopt in the atmospheric turbulence laser radar technique of the Differential Image method of movement (DIM), the lamp used in measuring method before use laser guide star (LGS) instead of.By the aperture time of the focal position and enhancement mode CCD (ICCD) that initiatively change laser, the atmospheric turbulence effect obtaining differing heights position can be measured.
Georgia Institute of Technology (GTRI) research group is only had to carry out systematic research according to the step of theoretical analysis, simplation verification, system development to DIM laser radar technique at present.
The optical system of the DIM laser radar of GTRI development is mainly divided into emission coefficient and receiving system two parts.Emission coefficient by pulsed laser, 4 turn to level crossing, beam expander, plane of scanning motion catoptron to form.During system works, light beam is imported beam expander through two steering reflection mirrors by 355nm laser beam after pulsed laser injection, then the laser after expanding is reflexed on a large plane mirror by two steering reflection mirrors, by this large plane mirror, laser reflection is entered in air, laser beam is focused at the height and position set; Receiving system by receiving primary mirror, receive secondary mirror, four receive sub-pupil, glass voussoir, plane of scanning motion catoptrons form.Backscatter signal in air is entered reception primary mirror by large plane mirror reflection, and light signal is converged to reception secondary mirror by primary mirror, and the light that secondary mirror reflects is divided into four bundles and enters the sub-pupil of different receptions by glass voussoir.Receive in this system and launch a shared block scan planar transmit mirror, but the angle of pitch of this planar transmit mirror can not regulate automatically, needs the orientation according to measuring to carry out manual adjustment to it before measuring.
But said system expands angle because beam expander also can not regulate automatically, and the height that laser converges to measuring position must set before measuring, so the rapid scanning that can not carry out differing heights position in whole measuring route is measured; And in emission coefficient, have employed level Four reflection, require very high to the degree of regulation of light path, improve adjustment difficulty; In addition, due to the loss that there is energy of catoptron, have impact on optical efficiency.
Summary of the invention
The object of this invention is to provide a kind of Range resolution based on the Differential Image method of movement initiatively atmospheric turbulence laser radar system, simplify light path, and there is higher optical efficiency.
The object of the invention is to be achieved through the following technical solutions:
Based on a Range resolution initiatively atmospheric turbulence laser radar system for the Differential Image method of movement, it is characterized in that, comprising: Laser Focusing emission coefficient and optical receiving system; Wherein:
Described Laser Focusing emission coefficient comprises: laser instrument, launch catoptron group, expand emission coefficient and plane of scanning motion catoptron; The laser that described laser instrument is launched injects plane of scanning motion catoptron, by plane of scanning motion mirror to air-launched signal through launching catoptron group and expanding emission coefficient successively;
Described optical receiving system comprises: from axle receiving system, calibration system and ICCD camera; Plane of scanning motion mirror by described from the receipts system acceptance that is coupling, is received by camera via after calibration system process after being reflected back plane of scanning motion mirror to the reflected signal of air-launched signal.
Described transmitting catoptron group comprises: first and second plane mirror; The described emission coefficient that expands comprises: launch secondary mirror and launch primary mirror;
The laser that described laser instrument is launched injects transmitting secondary mirror successively after first and second plane mirror, by launching secondary mirror, laser reflection is extremely launched the parallel beam that primary mirror light forms certain angle of divergence.
Described Laser Focusing emission coefficient also comprises: the first electric platforms;
The described transmitting secondary mirror expanded in emission coefficient is fixed on described first electric platforms, by described first electric platforms controlling to expand in emission coefficient the distance of launching secondary mirror and launching between primary mirror.
Describedly to comprise from axle receiving system: first and second receives primary mirror, first and second receives secondary mirror, first and second plane deviation mirror and Amici prism;
After described plane of scanning motion mirror is reflected back plane of scanning motion mirror to the reflected signal of air-launched signal, is received primary mirror by first and second and receive; First receives primary mirror injects Amici prism through the first reception secondary mirror and the first plane deviation mirror successively by the optical information received; Second receives primary mirror injects Amici prism through the second reception secondary mirror and the second plane deviation mirror successively by the optical information received.
Described optical receiving system also comprises: the second electric platforms;
Described ICCD camera is fixed on described second electric platforms, by described second electric platforms carrying out the spacing between control ICCD camera and calibration system.
As seen from the above technical solution provided by the invention, in native system, emission coefficient adopts secondary reflex, and optical path adjusting is very simple, and has higher optical efficiency; Meanwhile, the angle launch, received and beam-expanding system can regulate automatically, and automatically can focus the laser beam to assigned address, solution must not carry out the problem of rapid scanning measurement to whole measuring route.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme of the embodiment of the present invention, below the accompanying drawing used required in describing embodiment is briefly described, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawings can also be obtained according to these accompanying drawings.
The block diagram of a kind of active of the Range resolution based on Differential Image method of movement atmospheric turbulence laser radar system that Fig. 1 provides for the embodiment of the present invention;
The structural representation of a kind of active of the Range resolution based on Differential Image method of movement atmospheric turbulence laser radar system that Fig. 2 provides for the embodiment of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on embodiments of the invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to protection scope of the present invention.
The block diagram of a kind of active of the Range resolution based on Differential Image method of movement atmospheric turbulence laser radar system that Fig. 1 provides for the embodiment of the present invention.As shown in Figure 1, this system mainly comprises: Laser Focusing emission coefficient and optical receiving system; Wherein:
Described Laser Focusing emission coefficient comprises: laser instrument, launch catoptron group, expand emission coefficient and plane of scanning motion catoptron; The laser that described laser instrument is launched injects plane of scanning motion catoptron, by plane of scanning motion mirror to air-launched signal through launching catoptron group and expanding emission coefficient successively;
Described optical receiving system comprises: from axle receiving system, calibration system and ICCD camera; Plane of scanning motion mirror by described from the receipts system acceptance that is coupling, is received by camera via after calibration system process after being reflected back plane of scanning motion mirror to the reflected signal of air-launched signal.
For the ease of understanding, refinement is carried out to the parts in Fig. 1 below, and composition graphs 2 is described further.
The system that the embodiment of the present invention provides adopts 3 channels designs, and namely a laser emission channel and two are from axle receiving cable.As shown in Figure 2, described transmitting catoptron group comprises: first and second plane mirror (1 in Fig. 2 and 2); The described emission coefficient that expands comprises: launch secondary mirror 3 and launch primary mirror 4; Describedly to comprise from axle receiving system: first and second receives primary mirror (6 in Fig. 2 and 7), first and second receives secondary mirror (8 in Fig. 2 and 9), first and second plane deviation mirror (10 in Fig. 2 and 11) and Amici prism 12.
Described Laser Focusing emission coefficient adopts reflective Cassegrain's structure, the laser that described laser instrument (532nm ND:YAG laser) is launched is injected successively and is launched secondary mirror 3 after first and second plane mirror, by launching secondary mirror 3, laser reflection is extremely launched the parallel beam that primary mirror 4 light forms certain angle of divergence, transmitted to aerial different directions by plane of scanning motion mirror 5 again, light signal, through atmospheric scattering, is reflected back plane of scanning motion mirror 5.
Exemplary, above-mentioned parts can adopt following parameter: laser optical spot diameter is Ф 9mm, model can be adopted to be Powerlite DLS 9050 laser instrument of Continuum company, can provide the pulse laser of the 532nm of 50Hz, single pulse energy >=600mJ, pulse width 4 ~ 8ns; First and second plane mirror is the level crossing of Ф 40mm, and level crossing regulates the two-dimension adjustment microscope base adopting Beijing North light century optical instrument company limited, model TP203; Launch secondary mirror 3 for effective aperture be the convex paraboloid mirror of Ф 9mm, launch primary mirror 4 for effective aperture be the concave paraboloid mirror of Ф 250mm, central through hole Ф 10mm, namely the Entry pupil diameters of light signal is Ф 9mm, outgoing bore is Ф 250mm, expand multiplying power and be about 27.5 times, between primary and secondary mirror, nominal spacing is 530mm, and the spacing of the two regulates the convergence realizing different distance to launch by the first electric platforms, and the focal beam spot of different distance reaches minimum simultaneously.Plane of scanning motion catoptron 5 adopts one piece of anistree plane mirror, length 580mm, width 400mm, thick 40mm, and by 42 driving stepper motor, one group of Worm Wheel System, the upset realizing level crossing regulates; Exemplary, worm gear design parameter is: ratio of gear: 200, number of threads z1:1, worm gear number of teeth z2:200, operating center distance a:225.5mm, reference diameter of worm d1:51mm, reference circle of wormwheel diameter d 2:400mm, normal module mn:1.998mm.
After described plane of scanning motion mirror is reflected back plane of scanning motion mirror to the reflected signal of air-launched signal, is received primary mirror by first and second and receive; First receives primary mirror 6 injects Amici prism 12 through the first reception secondary mirror 8 and the first plane deviation mirror 10 successively by the optical information received; Second receives primary mirror 7 injects Amici prism 12 through the second reception secondary mirror 9 and the second plane deviation mirror 11 successively by the optical information received; By Amici prism 12, light signal is injected collimation and the beam splitting that calibration system (collimating system) carries out light signal, finally on the different region of ICCD camera, form two pictures.
Exemplary, above-mentioned parts can adopt following parameter: be the designing requirement such as Ф 100mm, main system focal length 4000mm, visual field ± 0.5mrad according to receiving system effective aperture, first and second receives primary mirror and all adopts off axis paraboloid mirror, secondary mirror adopts from the bi-curved optical texture form of crown of roll, and it is 140 that primary mirror measures from axle.Corresponding from axle amount from axle amount and off axis paraboloid mirror Y-direction 140 of section Y-direction 140 in the coordinate of telescopic system setting, reception secondary mirror chooses Y-direction 18 from axle amount, and bore is 20mm.Y field 0 °, ± three visual fields such as 0.0286 ° are chosen in system visual field, and operation wavelength is 532mm.ICCD camera model is the PI-MAX4:1024i of Princeton Instruments company, and image planes have 1024X1024 pixel, and analog to digital conversion speed can reach 32MHz/16-bit, the image providing 56 frames 512 × 512 per second.
In addition, in the embodiment of the present invention, described Laser Focusing emission coefficient also comprises: the first electric platforms; The described transmitting secondary mirror expanded in emission coefficient is fixed on described first electric platforms, by described first electric platforms controlling to expand in emission coefficient the distance of launching secondary mirror and launching between primary mirror, realizes the convergence of laser beam in space different distance.
Described optical receiving system also comprises: the second electric platforms; Described ICCD camera is fixed on described second electric platforms, by described second electric platforms carrying out the spacing between control ICCD camera and calibration system, it can be made to carry out imaging to the measuring position of different distance.
Compared with prior art, main tool has the following advantages the solution of the present invention:
1) Laser emission, can automatically the regulating of receiving system, can carry out the measurement of rapid scanning to whole measuring route differing heights
The secondary mirror of a, laser beam expanding emission coefficient has automatically controlled regulatory function to realize the focal beam spot of the different transmitting range of emission coefficient.
B, plane of scanning motion mirror have automatically controlled scan function, and transmitting and receiving system pitch range are 30 ° ~ 90 °, are convenient to regulate the direction measured.
C, optical receiving system are adjustable, and ICCD is fixed on electronic control translation stage, can be moved forward and backward by programmed control, to realize corresponding different measuring distance automatic focusings.
2) simplify laser beam emitting light path, the laser that laser instrument is launched, through secondary reflex, expands and directly enters air through plane surface sweeping mirror afterwards.Decrease energy ezpenditure, reduce optical path adjusting difficulty.
3) support platform top panel adopts normalized optical platform, and support platform bottom surface has the supporting leg of four adjustable levels, and has the deflecting roller that can realize movement among a small circle, and support platform has boom hoisting simultaneously, is convenient to integral lifting and carrying.
4) laser instrument and emitting-receiving system seal by thermal insulation board, ensure internal temperature stability to the full extent.
5) under off working state, plane of scanning motion mirror can be concealed in pressurized capsule, to keep the cleaning of the attractive in appearance of instrument outward appearance and optical module.
The above; be only the present invention's preferably embodiment, but protection scope of the present invention is not limited thereto, is anyly familiar with those skilled in the art in the technical scope that the present invention discloses; the change that can expect easily or replacement, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain of claims.
Claims (5)
1., based on a Range resolution initiatively atmospheric turbulence laser radar system for the Differential Image method of movement, it is characterized in that, comprising: Laser Focusing emission coefficient and optical receiving system; Wherein:
Described Laser Focusing emission coefficient comprises: laser instrument, launch catoptron group, expand emission coefficient and plane of scanning motion catoptron; The laser that described laser instrument is launched injects plane of scanning motion catoptron, by plane of scanning motion mirror to air-launched signal through launching catoptron group and expanding emission coefficient successively;
Described optical receiving system comprises: from axle receiving system, calibration system and ICCD camera; Plane of scanning motion mirror by described from the receipts system acceptance that is coupling, is received by camera via after calibration system process after being reflected back plane of scanning motion mirror to the reflected signal of air-launched signal.
2. system according to claim 1, is characterized in that,
Described transmitting catoptron group comprises: first and second plane mirror; The described emission coefficient that expands comprises: launch secondary mirror and launch primary mirror;
The laser that described laser instrument is launched injects transmitting secondary mirror successively after first and second plane mirror, by launching secondary mirror, laser reflection is extremely launched the parallel beam that primary mirror light forms certain angle of divergence.
3. system according to claim 1 and 2, is characterized in that, described Laser Focusing emission coefficient also comprises: the first electric platforms;
The described transmitting secondary mirror expanded in emission coefficient is fixed on described first electric platforms, by described first electric platforms controlling to expand in emission coefficient the distance of launching secondary mirror and launching between primary mirror.
4. system according to claim 1, is characterized in that, describedly comprises from axle receiving system: first and second receives primary mirror, first and second receives secondary mirror, first and second plane deviation mirror and Amici prism;
After described plane of scanning motion mirror is reflected back plane of scanning motion mirror to the reflected signal of air-launched signal, is received primary mirror by first and second and receive; First receives primary mirror injects Amici prism through the first reception secondary mirror and the first plane deviation mirror successively by the optical information received; Second receives primary mirror injects Amici prism through the second reception secondary mirror and the second plane deviation mirror successively by the optical information received.
5. the system according to claim 1 or 4, is characterized in that, described optical receiving system also comprises: the second electric platforms;
Described ICCD camera is fixed on described second electric platforms, by described second electric platforms carrying out the spacing between control ICCD camera and calibration system.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105158230A (en) * | 2015-09-08 | 2015-12-16 | 中国科学院合肥物质科学研究院 | Device for measuring polluting gases in atmospheric boundary layer based on CCD (Charge Coupled Device) imaging laser radar |
| CN114660616A (en) * | 2016-12-31 | 2022-06-24 | 图达通智能美国有限公司 | 2D scanning high precision LiDAR using a combination of rotating concave mirrors and beam steering devices |
| US11808888B2 (en) | 2018-02-23 | 2023-11-07 | Innovusion, Inc. | Multi-wavelength pulse steering in LiDAR systems |
| US11988773B2 (en) | 2018-02-23 | 2024-05-21 | Innovusion, Inc. | 2-dimensional steering system for lidar systems |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105158230A (en) * | 2015-09-08 | 2015-12-16 | 中国科学院合肥物质科学研究院 | Device for measuring polluting gases in atmospheric boundary layer based on CCD (Charge Coupled Device) imaging laser radar |
| CN114660616A (en) * | 2016-12-31 | 2022-06-24 | 图达通智能美国有限公司 | 2D scanning high precision LiDAR using a combination of rotating concave mirrors and beam steering devices |
| CN114660616B (en) * | 2016-12-31 | 2023-04-11 | 图达通智能美国有限公司 | 2D scanning high precision LiDAR using a combination of rotating concave mirrors and beam steering devices |
| US11782132B2 (en) | 2016-12-31 | 2023-10-10 | Innovusion, Inc. | 2D scanning high precision LiDAR using combination of rotating concave mirror and beam steering devices |
| US11782131B2 (en) | 2016-12-31 | 2023-10-10 | Innovusion, Inc. | 2D scanning high precision LiDAR using combination of rotating concave mirror and beam steering devices |
| US11899134B2 (en) | 2016-12-31 | 2024-02-13 | Innovusion, Inc. | 2D scanning high precision lidar using combination of rotating concave mirror and beam steering devices |
| US11977183B2 (en) | 2016-12-31 | 2024-05-07 | Seyond, Inc. | 2D scanning high precision LiDAR using combination of rotating concave mirror and beam steering devices |
| US11808888B2 (en) | 2018-02-23 | 2023-11-07 | Innovusion, Inc. | Multi-wavelength pulse steering in LiDAR systems |
| US11988773B2 (en) | 2018-02-23 | 2024-05-21 | Innovusion, Inc. | 2-dimensional steering system for lidar systems |
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