CN103033818A - Anti-cloud-disturbance laser detection device - Google Patents
Anti-cloud-disturbance laser detection device Download PDFInfo
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- CN103033818A CN103033818A CN2012105692847A CN201210569284A CN103033818A CN 103033818 A CN103033818 A CN 103033818A CN 2012105692847 A CN2012105692847 A CN 2012105692847A CN 201210569284 A CN201210569284 A CN 201210569284A CN 103033818 A CN103033818 A CN 103033818A
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Abstract
The invention discloses an anti-cloud-disturbance laser detection device and relates to the technical field of laser detection device. The anti-cloud-disturbance device comprises an emitting unit, a receiving unit and a timing pulse generator. The emitting unit comprises a horizontally polarized pulse laser generator, a vertically polarized pulse laser generator, and an emitting optical system. The receiving unit comprises a receiving optical system, a vertically polarized optical filter, a light sensor, a receiving amplifying passageway, a peak-value detector circuit and a threshold comparator. The anti-cloud-disturbance laser detection device is capable of reducing cloud disturbance. When cloud disturbance occurs, no signal is output. When cloud disturbance disappears, target triggering signal is output, so that detection accuracy is increased.
Description
Technical field
The present invention relates to the Laser Detecting Set technical field, relate in particular to a kind of anti-cloud and mist and disturb Laser Detecting Set.
Background technology
Because laser is in infrared frequency range, cloud and mist can produce than strong scattering and decay laser signal.So in the cloud and mist environment, infrared light forms Multiple Scattering between cloud and mist water particulate, Laser Detecting Set receives the undesired signal that had both existed the cloud and mist Multiple Scattering to form in the echoed signal; There is again the target echo signal that causes amplitude to reduce because of the cloud and mist scatter attenuation.For realizing the environmental suitability of Laser Detecting Set, will take necessary anti-cloud and mist perturbation technique.
Cloud and mist is different with made Target light reflex characteristic.Because water in the cloud and mist exists with graininess, when polarizing light irradiation produces reflex time to cloud and mist, can form the variation of polarized light polarization characteristic, i.e. there is serious " depolarized " phenomenon in cloud and mist reflection; And the made Target surface is regular surfaces to the infrared light wavelength, does not substantially have " depolarized " phenomenon.Utilize cloud and mist different to the polarized light reflection characteristic with made Target, can consist of effective anti-cloud and mist EVAC (Evacuation Network Computer Model).
Summary of the invention
Technical matters to be solved by this invention provides a kind of anti-cloud and mist and disturbs Laser Detecting Set, and described device can reduce the interference of cloud and mist, has improved the accuracy of surveying.
For solving the problems of the technologies described above, the technical solution used in the present invention is: a kind of anti-cloud and mist disturbs Laser Detecting Set, it is characterized in that, comprising:
Sequence timer, the sequential that is used for control horizontal polarization pulse laser generator, vertical polarization pulse laser generator, peak detector and threshold compataror, for generation of the transponder pulse burst that comprises at least two specified time intervals, adjust front and back pulse height relation by changing the sequences of pulsed signals time interval;
Transmitter unit:
The horizontal polarization pulse laser generator is according to the continuous emission level polarized pulses of specified time interval signal;
The vertical polarization pulse laser generator is launched the vertical polarization pulse signal continuously according to specified time interval;
Optical transmitting system, the horizontal and vertical polarized pulses signal that is used for producing forms the particular transmission beam shape according to application characteristic;
Receiving element:
Receiving optics is used for receiving transmitting of the interior object reflection of certain spatial areas;
Polarizing filter is used for filtering, and level or vertical polarization pulse signal amplitude are decayed, and corresponding horizontal or vertical polarized pulses signal is undamped;
Photo-detector is used for light pulse signal is converted to electric impulse signal;
Receive amplification channel, be used for and be transferred to peak detector and threshold compataror after the electric impulse signal amplification processing;
Peak detector be used for to realize that the amplitude detection of electric impulse signal keeps, and its output is as the thresholding input of threshold compataror, with peak-detector circuit retention time sequence the preceding pulse amplitude be used for comparison threshold as follow-up signal;
Threshold compataror is used for relatively horizontal polarization pulse signal and the vertical polarization pulse signal of specified time interval, and whether selects the export target trigger pip according to actual value.
Preferably: described polarizing filter is horizontal polarization optical filter or vertical polarization optical filter.
The beneficial effect that adopts technique scheme to produce is: described device utilizes cloud and mist different to the polarized light reflection characteristic with made Target, the design transmitter unit successively sends horizontal polarization light signal and vertical polarization light signal continuously according to specified time interval, then vertical polarization optical filter or horizontal polarization optical filter are adopted in the receiving element optical design, vertical polarization optical filter Reduction Level polarized light signal, and orthogonal polarized light signal lossless consumption is passed through, horizontal polarization optical filter decay vertical polarization light signal passes through and the horizontal polarization light signal is lossless.When using the vertical polarization optical filter, at first send the horizontal polarization light signal, right hand sends the vertical polarization light signal, when the usage level polarizing filter, at first sends the vertical polarization light signal, and right hand sends the horizontal polarization light signal.Receiving element with described device uses the vertical polarization optical filter as example, and when without cloud and mist, made Target reflected light polarization state is constant, after the filtering of vertical polarization optical filter, first light pulse signal amplitude fading, second light pulse signal is undamped, and the front and back signal amplitude difference is very large.When having cloud and mist, depolarization appears in the cloud and mist reflected light signal, no matter is emitted as horizontal polarization light or orthogonal polarized light, and reflected light all approaches without polarized light; After the filtering of vertical polarization optical filter, two pulse amplitudes approach, and are judged to be cloud and mist and disturb non-output signal; When first light pulse amplitude during far below second light pulse amplitude, be judged to be echo signal, threshold compataror export target trigger pip.Therefore, described device can reduce the interference of cloud and mist, when having cloud and mist to disturb, and non-output signal, when disturbing without cloud and mist, the export target trigger pip has improved the accuracy of surveying.
Description of drawings
The present invention is further detailed explanation below in conjunction with the drawings and specific embodiments.
Fig. 1 is theory diagram of the present invention;
Fig. 2 is the horizontal polarization of the present invention sequential synoptic diagram that transmits;
Fig. 3 is the vertical polarization of the present invention sequential synoptic diagram that transmits;
Fig. 4 is that reception signal of the present invention is without the sequential synoptic diagram of cloud and mist echo;
Fig. 5 is the sequential synoptic diagram of reception signal driftlessness echo of the present invention;
Fig. 6 is the sequential synoptic diagram of threshold compataror input signal of the present invention;
Fig. 7 is the sequential synoptic diagram of threshold compataror output signal of the present invention.
Embodiment
As shown in Figure 1, take polarizing filter as the vertical polarization optical filter as example.A kind of anti-cloud and mist disturbs Laser Detecting Set, comprises transmitter unit, receiving element and sequence timer.Sequence timer, the sequential that is used for control horizontal polarization pulse laser generator, vertical polarization pulse laser generator, peak detector and threshold compataror, thereby realize the sequential control to described device complete machine, also can be used for producing the transponder pulse burst that comprises at least two specified time intervals, adjust front and back pulse height relation by changing the sequences of pulsed signals time interval.
Transmitter unit comprises horizontal polarization pulse laser generator, vertical polarization pulse laser generator and optical transmitting system; The horizontal polarization pulse laser generator is according to control sequential emission level polarized pulses signal; The vertical polarization pulse laser generator is according to control sequential emission vertical polarization pulse signal; Optical transmitting system, the horizontal and vertical polarized pulses light signal that is used for producing forms the particular transmission beam shape according to application characteristic.
Receiving element comprises receiving optics, vertical polarization optical filter, photo-detector, reception amplification channel, peak-detector circuit and threshold compataror.Receiving optics is used for receiving transmitting of the interior object reflection of certain spatial areas; The vertical polarization optical filter is used for filtering, and horizontal polarization pulse signal amplitude is decayed, and the vertical polarization pulse signal is undamped; Photo-detector is used for light pulse signal is converted to electric impulse signal; Receive amplification channel, be used for and be transferred to peak detector and threshold compataror after the electric impulse signal amplification processing; Peak detector be used for to realize that the amplitude detection of electric impulse signal keeps, and peak-detector circuit retention time sequence the preceding pulse amplitude is used for comparison threshold as follow-up signal; Threshold compataror, be used for relatively before and after pulse amplitude, and whether select the export target trigger pip according to actual value.
Be depicted as sequential logic figure of the present invention such as Fig. 2-7, described device utilizes cloud and mist different to the polarized light reflection characteristic with made Target, the design transmitter unit successively sends horizontal polarization light signal and vertical polarization light signal continuously according to specified time interval, then the vertical polarization optical filter is adopted in the receiving element optical design, vertical polarization optical filter Reduction Level polarized light signal, and orthogonal polarized light signal lossless consumption is passed through.When without cloud and mist, made Target reflected light polarization state is constant, after the filtering of vertical polarization optical filter, and first light pulse signal amplitude fading, second light pulse signal is undamped, and the front and back signal amplitude difference is very large.
When polarizing filter for when the horizontal polarization optical filter, only need adapt aspect the principle launch first the vertical polarization signal after the emission level polarization signal can realize the function of described device; The pulse interval that described device can be taked to change the sequence timer transmission carries out front and back pulse height relation adjustment.
When having cloud and mist, depolarization appears in the cloud and mist reflected light signal, no matter is emitted as horizontal polarization light or orthogonal polarized light, and reflected light all approaches without polarized light; After the filtering of vertical polarization optical filter, two pulse amplitudes approach, and are judged to be cloud and mist and disturb non-output signal; When first light pulse amplitude during far below second light pulse amplitude, be judged to be echo signal, threshold compataror export target trigger pip.Therefore, described device can reduce the interference of cloud and mist, when having cloud and mist to disturb, and non-output signal, when disturbing without cloud and mist, the export target trigger pip has improved the accuracy of surveying.
Used specific case herein principle of the present invention and embodiment thereof are set forth, the explanation of above embodiment is just with helping understand method of the present invention and core concept thereof.Should be pointed out that for the person of ordinary skill of the art, can also carry out some improvement and modification to the present invention under the prerequisite that does not break away from the principle of the invention, these improvement and modification also fall in the protection domain of claim of the present invention.
Claims (2)
1. an anti-cloud and mist disturbs Laser Detecting Set, it is characterized in that, comprising:
Sequence timer, the sequential that is used for control horizontal polarization pulse laser generator, vertical polarization pulse laser generator, peak detector and threshold compataror, for generation of the transponder pulse burst that comprises at least two specified time intervals, adjust front and back pulse height relation by changing the sequences of pulsed signals time interval;
Transmitter unit:
The horizontal polarization pulse laser generator is according to the continuous emission level polarized pulses of specified time interval signal;
The vertical polarization pulse laser generator is launched the vertical polarization pulse signal continuously according to specified time interval;
Optical transmitting system, the horizontal and vertical polarized pulses signal that is used for producing forms the particular transmission beam shape according to application characteristic;
Receiving element:
Receiving optics is used for receiving transmitting of the interior object reflection of certain spatial areas;
Polarizing filter is used for filtering, and level or vertical polarization pulse signal amplitude are decayed, and corresponding horizontal or vertical polarized pulses signal is undamped;
Photo-detector is used for light pulse signal is converted to electric impulse signal;
Receive amplification channel, be used for and be transferred to peak detector and threshold compataror after the electric impulse signal amplification processing;
Peak detector be used for to realize that the amplitude detection of electric impulse signal keeps, and its output is as the thresholding input of threshold compataror, with peak-detector circuit retention time sequence the preceding pulse amplitude be used for comparison threshold as follow-up signal;
Threshold compataror is used for relatively horizontal polarization pulse signal and the vertical polarization pulse signal of specified time interval, and whether selects the export target trigger pip according to actual value.
2. a kind of anti-cloud and mist according to claim 1 disturbs Laser Detecting Set, it is characterized in that described polarizing filter is horizontal polarization optical filter or vertical polarization optical filter.
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| CN2012105692847A CN103033818A (en) | 2012-12-25 | 2012-12-25 | Anti-cloud-disturbance laser detection device |
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| CN2012105692847A CN103033818A (en) | 2012-12-25 | 2012-12-25 | Anti-cloud-disturbance laser detection device |
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| CN103033818A true CN103033818A (en) | 2013-04-10 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107064834A (en) * | 2017-05-05 | 2017-08-18 | 北京航空航天大学 | A kind of wideband electromagnetic imaging surface signal acquiring system switched based on light path |
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| US4004237A (en) * | 1970-05-01 | 1977-01-18 | Harris Corporation | System for communication and navigation |
| US6594000B2 (en) * | 2001-01-25 | 2003-07-15 | Science And Technology Corporation | Automatic gain control system for use with multiple wavelength signal detector |
| US20060007422A1 (en) * | 2004-07-06 | 2006-01-12 | Jerry Dimsdale | System and method for determining range in 3D imaging systems |
| WO2009133414A1 (en) * | 2008-05-02 | 2009-11-05 | Marko Borosak | Pulsed-laser beam detector with improved sun and temperature compensation |
| CN102707331A (en) * | 2012-06-08 | 2012-10-03 | 北京理工大学 | Receiving and transmitting integrated sub-nanosecond pulse laser detection system based on polarization |
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2012
- 2012-12-25 CN CN2012105692847A patent/CN103033818A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4004237A (en) * | 1970-05-01 | 1977-01-18 | Harris Corporation | System for communication and navigation |
| US6594000B2 (en) * | 2001-01-25 | 2003-07-15 | Science And Technology Corporation | Automatic gain control system for use with multiple wavelength signal detector |
| US20060007422A1 (en) * | 2004-07-06 | 2006-01-12 | Jerry Dimsdale | System and method for determining range in 3D imaging systems |
| WO2009133414A1 (en) * | 2008-05-02 | 2009-11-05 | Marko Borosak | Pulsed-laser beam detector with improved sun and temperature compensation |
| CN102707331A (en) * | 2012-06-08 | 2012-10-03 | 北京理工大学 | Receiving and transmitting integrated sub-nanosecond pulse laser detection system based on polarization |
Non-Patent Citations (1)
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| 赵继芝等: "大气云层分布的偏振激光后向散射研究", 《应用光学》, vol. 32, no. 5, 30 September 2011 (2011-09-30), pages 1037 - 1043 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107064834A (en) * | 2017-05-05 | 2017-08-18 | 北京航空航天大学 | A kind of wideband electromagnetic imaging surface signal acquiring system switched based on light path |
| CN107064834B (en) * | 2017-05-05 | 2020-03-10 | 北京航空航天大学 | Broadband electromagnetic imaging surface signal acquisition system based on light path switching |
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Application publication date: 20130410 |