CN1329742C - Laser radar control method based on image intensifier - Google Patents
Laser radar control method based on image intensifier Download PDFInfo
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- CN1329742C CN1329742C CNB2004100648237A CN200410064823A CN1329742C CN 1329742 C CN1329742 C CN 1329742C CN B2004100648237 A CNB2004100648237 A CN B2004100648237A CN 200410064823 A CN200410064823 A CN 200410064823A CN 1329742 C CN1329742 C CN 1329742C
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- image intensifier
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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
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- 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 present invention discloses a laser radar control method based on an image intensifier. An image intensifier is adopted as a detector, and a laser echo image is obtained and is used for inverting atmosphere information. A CCD camera coupled with the image intensifier collects video signals. After the video signals are synchronously separated and processed, a laser device is triggered to emit light. A photo diode detects light outlet time and triggers a delayer. A time delayed signal generates a pulse signal by a pulse width generator, which triggers the image intensifier to work. The laser radar control method based on an image intensifier can be suitable for controlling a plurality of laser radars which adopt image sensors having the opening time control function. The control precision is higher, and the present invention has practical value.
Description
Technical field
The present invention relates to optical environment monitoring and person in electronics, specifically is a kind of laser radar control method based on image intensifier.
Background technology
Laser radar is an important means of measuring atmospheric parameter, in order to obtain the atmospheric information of differing heights, need survey the return laser beam of different distance, the conventional laser radar is based on photomultiplier or photon counter as detector, therefore control system is as long as detect the bright dipping time, the appropriate time (not requiring accurate especially) of delaying time is again opened multiplier tube or photon counter, can obtain information needed.But the getable information of this radar can not be satisfied the demand fully.
Summary of the invention
In order to solve the problem that such scheme occurs, take accurate delay, utilize the speed and the product of time of Laser Transmission to obtain desired distance, adopt the open the door product of the time and the light velocity of accurate image intensifier to obtain desired light beam length, by a series of accurate control delay times and opening the door the time, atmosphere is carried out some differential profile observations,, obtain the profile information of atmosphere again by analysis to data.In order to achieve the above object, the delay time and the time precision that opens the door will reach 10 nanosecond orders (the corresponding distance or the precision of gas column length are 1.5 meters) at least.Image intensifier must add the CCD camera, so there is stationary problem, promptly image can not appear at the blanking moment of CCD camera, otherwise can not get image, so the whole system operation sequential must be accepted the control of CCD synchronizing signal.
Technical scheme of the present invention is as follows:
Laser radar control method based on image intensifier is characterized in that:
Image intensifier is placed on receiving telescope focus place, by the relay lens coupling scheme image intensifier and CCD camera are coupled, the vision signal that the CCD device is gathered and exported, be divided into two-way: the one tunnel gives computer acquisition, one tunnel input sync separator carries out separated in synchronization, output parity field synchronizing signal, export narrow pulse signal after this parity field synchronizing signal input monostable circuit, export buffering signals behind this narrow pulse signal input buffer, buffering signals is sent into the external trigger of laser instrument, and laser instrument is triggered bright dipping; Export at laser instrument, detect quarter light time by PIN photodiode, export out light signal, go out the light signal emitter follower input and cushion, the outputting standard Transistor-Transistor Logic level triggers programmable delayer, trigger pulse width generator able to programme by programmable delayer output trigger pip, pulse width generator able to programme produces pulse signal, and after this pulse signal inputed to the power drive part, output drive signal triggered image intensifier work.
Sync separator is chip used to be LM1881; But laser instrument is the YAG pulsed laser of external trigger, repetition frequency 25Hz; Monostable circuit is chip used to be 74ls123; PIN photodiode is the high-speed silicon PIN photodiode.
Output narrow pulse signal pulsewidth is the 9-11 microsecond after the monostable circuit.
Effect of the present invention
Can be competent at most controls of adopting the laser radar of the image sensor that has the time control of opening the door based on the laser radar control method of image intensifier, control accuracy is higher, has practical value.
Description of drawings
Fig. 1 is a control method functional-block diagram of the present invention.
Fig. 2 is a control system block scheme of the present invention.
Fig. 3 is a timing sequencer block diagram of the present invention.
Fig. 4 is single chip part circuit theory diagrams of the present invention.
Fig. 5 is a time-delay partial circuit schematic diagram of the present invention.
Embodiment
Referring to Fig. 1-5, image intensifier is placed on receiving telescope focus place, by the relay lens coupling scheme image intensifier and CCD camera are coupled, the vision signal that the CCD device is gathered and exported, be divided into two-way: the one tunnel gives computer acquisition, one tunnel input sync separator LM1881 carries out separated in synchronization, output parity field synchronizing signal, output pulse width is a 9-11 microsecond narrow pulse signal behind this parity field synchronizing signal input monostable circuit 74ls123, export buffering signals behind this narrow pulse signal input buffer, buffering signals is sent into the external trigger of laser instrument, and laser instrument is triggered bright dipping; But laser instrument is the YAG pulsed laser of external trigger, repetition frequency 25Hz; Export at laser instrument, detect quarter light time by the high-speed silicon PIN photodiode, export out light signal, go out the light signal emitter follower input and cushion, the outputting standard Transistor-Transistor Logic level triggers programmable delayer, trigger pulse width generator able to programme by programmable delayer output trigger pip, pulse width generator able to programme produces pulse signal, and after this pulse signal inputed to the power drive part, output drive signal triggered image intensifier work.
Image intensifier directly is connected with receiving telescope by cylinder, makes the photosurface of image intensifier be in the image intensifier focal plane and gets final product.The relaying light path comprises two catoptron and diverging systems of adjusting beam direction.Laser beam is directly incident on the telescope secondary mirror through a diverging system.Diverging system can be that negative lens also can be a positive lens.
Computing machine and single-chip microcomputer carry out data communication by the parallel port, and the instruction that single-chip microcomputer transmits computing machine is converted into the drive signal of each topworks, and latch is with the preset end of data latching in presettable counter.By as far as closely or in the scanning process from the near to the remote, computing machine sends data to single-chip microcomputer by penetrating fixed data in advance, handles the pulse signal that the back forms stepper motor through single-chip microcomputer, offers stepper motor driver at system's focal length, the control machine operation of focusing.
Transmit and receive the cassette astronomical telescope that telescope is bore 350mm.Image intensifier is the high speed gate image intensifier of the loose company in Japanese shore, and model is C7609.The CCD camera is selected common high resolving power black-white CCD for use.Single-chip microcomputer adopts the PIC16C74 of microchip company, latch adopts 3 74LS373, the basic counter unit of forming chronotron and pulse producer adopts 2 74F163 and 5 74ls191 high speed presettable counters altogether, counting clock 100MHz, and time precision reaches 5nS.Reference time delay is 0.5 μ S-200 μ S, and the pulse-width regulated scope is 100nS-10 μ S time-delay and pulse width generator (timing sequencer).
Claims (3)
1, based on the laser radar control method of image intensifier, it is characterized in that:
Image intensifier is placed on receiving telescope focus place, by the relay lens coupling scheme image intensifier and CCD camera are coupled, the vision signal that the CCD camera is gathered and exported, be divided into two-way: the one tunnel gives computer acquisition, one tunnel input sync separator carries out separated in synchronization, output parity field synchronizing signal, export narrow pulse signal after this parity field synchronizing signal input monostable circuit, export buffering signals behind this narrow pulse signal input buffer, buffering signals is sent into the external trigger of laser instrument, and laser instrument is triggered bright dipping; Export at laser instrument, detect quarter light time by PIN photodiode, export out light signal, go out the light signal emitter follower input and cushion, the outputting standard Transistor-Transistor Logic level triggers programmable delayer, trigger pulse width generator able to programme by programmable delayer output trigger pip, pulse width generator able to programme produces pulse signal, and after this pulse signal inputed to the power drive part, output drive signal triggered image intensifier work.
2, the laser radar control method based on image intensifier according to claim 1 is characterized in that image intensifier adopts high speed gate image intensifier; Sync separator is chip used to be LM1881; But laser instrument is the YAG pulsed laser of external trigger, repetition frequency 25Hz; Monostable circuit is chip used to be 741s123; PIN photodiode is the high-speed silicon PIN photodiode.
3, the laser radar control method based on image intensifier according to claim 1 is characterized in that the video field sync signal is exported the narrow pulse signal pulsewidth after monostable circuit be the 9-11 microsecond.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CNB2004100648237A CN1329742C (en) | 2004-09-30 | 2004-09-30 | Laser radar control method based on image intensifier |
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2004100648237A CN1329742C (en) | 2004-09-30 | 2004-09-30 | Laser radar control method based on image intensifier |
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| CN1619333A CN1619333A (en) | 2005-05-25 |
| CN1329742C true CN1329742C (en) | 2007-08-01 |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100443920C (en) * | 2006-06-29 | 2008-12-17 | 哈尔滨工业大学 | Gain modulation type pulse imaging laser radar system |
| CN100462737C (en) * | 2006-06-29 | 2009-02-18 | 哈尔滨工业大学 | Distance gate type laser 3D imaging radar system |
| CN103135102A (en) * | 2013-02-02 | 2013-06-05 | 中国科学院安徽光学精密机械研究所 | Laser radar system with function of inhibiting low-altitude strong echo signals |
| CN104931974A (en) * | 2015-06-15 | 2015-09-23 | 中国科学院上海光学精密机械研究所 | Light source modulation and demodulation-based ICMOS high-speed 3D imaging laser radar |
| CN106527262A (en) * | 2016-11-04 | 2017-03-22 | 合肥天讯亿达光电技术有限公司 | Single wavelength laser radar monitoring system |
| CN109932729A (en) * | 2019-04-19 | 2019-06-25 | 北京瑞特森传感科技有限公司 | Face battle array laser radar |
| CN113702005A (en) * | 2021-08-31 | 2021-11-26 | 中国科学院合肥物质科学研究院 | Synchronous signal measuring device of Q-switched laser |
| CN114895288B (en) * | 2022-05-10 | 2022-11-15 | 哈尔滨方聚科技发展有限公司 | Laser echo generation system for three-dimensional scene |
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