CN204705715U - A kind of compact ultra-short pulse laser long-distance ranging system - Google Patents
A kind of compact ultra-short pulse laser long-distance ranging system Download PDFInfo
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- CN204705715U CN204705715U CN201520365428.6U CN201520365428U CN204705715U CN 204705715 U CN204705715 U CN 204705715U CN 201520365428 U CN201520365428 U CN 201520365428U CN 204705715 U CN204705715 U CN 204705715U
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Abstract
The utility model discloses a kind of compact ultra-short pulse laser long-distance ranging system, comprise LASER Light Source, expand module one, expand module two, beam splitter, transmitting and receiving module, catoptron, filtration module, condenser lens, photodetector, described LASER Light Source is ultrashort pulse laser, Emission Lasers light beam, its output laser pulse width is psec ~ subpicosecond; The utility model adopts launches light path and the coaxial system of receiving light path, adopts one piece of catoptron namely to complete the sampling of main wave pulse signal; The size being adjusted incident main ripple signal by the coated reflection rate changing catoptron prevented strong main wave pulse signal to the damage of photodetector; The ranging of this laser distance measuring system is far away, measuring accuracy is high; System architecture is simply compact, cost is low.
Description
Technical field
The utility model relates to pulsed laser ranging technical field, is specifically related to a kind of compact ultra-short pulse laser long-distance ranging system.
Background technology
Pulsed laser ranging refers to a kind of measuring technique utilizing the pulse laser beam of directive measuring distance of target to carry out measurement target distance.Laser distance measuring system generally comprises: LASER Light Source, laser transmitting system, return laser beam receiving system and input PIAPACS.
LASER Light Source emission pulse laser bundle, through laser transmitting system, overwhelming majority laser beam is transmitted to measuring distance of target direction, Emission Lasers bundle is after the reflection of measuring distance of target, return comparatively faint echo laser beam, this echo laser beam through receiving optics photoelectric detector as echo pulse signal; Wherein very little a part of laser beam is sampled, is then converged to photodetector as main wave pulse signal.Finally, by the comparative analysis of echo pulse signal and main wave pulse signal, measured distance is drawn in conjunction with range equation.
In existing remote laser range measurement system, Laser emission and receiving optics have two kinds of design proposals:
A kind of design being transmitting light path and being separated with receiving light path, comprise two heavy caliber eyeglasses and a photodetector, heavy caliber eyeglass is used for launching, another heavy caliber eyeglass is used for receiving, and wherein the sampling of main ripple signal is inserted transmitting and receiving light path respectively by two panels facet reflection mirror and realized.This design proposal needs two heavy caliber eyeglasses, and whole system is comparatively complicated, and is difficult to make miniaturization;
Another kind launches light path and the same shaft design of receiving light path, comprises a heavy caliber eyeglass and two photodetectors, realize the transmitting and receiving of laser beam with a heavy caliber eyeglass simultaneously; Its main ripple signal is then by inserting a beam splitter in transmitting light path, is separated tiny segment light beam and enters second photodetector, thus as main ripple signal.Although this design proposal only needs a heavy caliber eyeglass, but the sampling of its main ripple signal adds a photodetector, and its main ripple signal and echoed signal need through different photoelectric sensor systems, the circuit delay difference certainly existed can cause signal transacting and have a strong impact on, thus reduces the measuring accuracy of range measurement system.
In existing ground object target remote laser range measurement system, the LASER Light Source used is generally nanosecond pulse width Laser output, and its measuring accuracy is difficult to improve owing to being subject to the restriction of laser pulse width; Meanwhile, overlength distance laser ranging is then needed to export pulse laser there is very high peak power, thus make the output energy requirement of laser instrument high especially, make LASER Light Source energy requirements very large and system complex, volume are comparatively huge.
Utility model content
For above-mentioned problems of the prior art, the utility model provides that a kind of ranging is far away, measuring accuracy is high, system is simple, the ultra-short pulse laser long-distance ranging system of compact conformation.
For achieving the above object, the utility model provides following technical scheme:
A compact ultra-short pulse laser long-distance ranging system, comprises LASER Light Source, expands module one, expands module two, beam splitter, transmitting and receiving module, catoptron, filtration module, condenser lens and photodetector;
Described expand module one comprise parallel and with optical axis arrangement lenslet one and lenslet two;
Described expand module two comprise parallel and with optical axis arrangement large lens one and large lens two;
Described LASER Light Source, lenslet two, lenslet one, large lens two, large lens one and transmitting and receiving module are sequentially arranged on same optical axis, described lenslet one and the confocal placement of described large lens two, described large lens one and the confocal placement of described transmitting and receiving module;
Described beam splitter is located between described large lens one and large lens two, and is that 45° angle is placed with the optical axis of described large lens two;
The side of described beam splitter is located at by described catoptron, and with the parallel placement of optical axis of described large lens two;
Described filtration module is located at the another side of described beam splitter, and places with described mirror parallel;
Described condenser lens is parallel with described filtration module and place with optical axis;
The focal position of described condenser lens is located at by described photodetector.
Further, described LASER Light Source is ultrashort pulse laser, and the laser pulse width that described ultrashort pulse laser exports is 0.1 ~ 100ps, and peak power is 0.1-100MW.
Further, module one is expanded described in and described module two surface that expands all is coated with film to the laser high permeability that described LASER Light Source exports.
Further, described lenslet one and described lenslet two diameter are 2 ~ 20mm.
Further, described large lens one and described large lens two diameter are 10 ~ 200mm.
Further, described beam splitter is semi-transparent semi-reflecting lens.
Further, described transmitting and receiving module is throw face mirror from axle, and bore is 100 ~ 2000mm, and surface is coated with the film to the laser high reflectance that described LASER Light Source exports, and fleet angle is 5 ° ~ 80 °.
Further, described condenser lens surface is coated with the film to the laser high permeability that described LASER Light Source exports, and diameter is 10 ~ 200mm.
The beneficial effects of the utility model are as follows:
1, adopt and launch light path and the coaxial system of receiving light path, the ingenious position relationship that beam splitter and catoptron are set, can complete the sampling of main ripple signal by means of only increase catoptron, whole system only needs a photodetector can complete the detection of echoed signal and main ripple signal simultaneously;
2, owing to only adopting a photodetector in whole system, thus realize system compact simple while, avoid and adopt circuit delay time of causing of multiple photodetector different, thus improve the accuracy of whole system range measurement;
3, adopt ultrashort pulse laser as LASER Light Source, Output of laser light beam is picosecond magnitude pulse laser, and output power is high, thus beam Propagation distance, the therefore far measuring distance of whole system;
4, the pulse laser pulse width of LASER Light Source output is narrow, thus time identification is high, and therefore the measuring accuracy of whole system is high;
5, the reflectivity of catoptron is adjusted by the different film of plating, thus the size of the main ripple signal inciding photodetector is adjusted according to the difference of the laser intensity of LASER Light Source output, strong main ripple signal therefore can be prevented the damage of photodetector;
6, whole system is simple and compact for structure, cost is low.
Accompanying drawing explanation
Fig. 1 is one-piece construction schematic diagram of the present utility model;
Fig. 2 is the plane figure of transmitting and receiving module of the present utility model.
In figure, 1-LASER Light Source; 2-expand module one; 21-lenslet one; 22-lenslet two; 3-expand module two; 31-large lens one; 32-large lens two; 4-beam splitter; 5-transmitting and receiving module; 6-catoptron; 7-filtration module; 8-condenser lens; 9-photodetector.
Embodiment
The technical solution of the utility model is understood better in order to make those skilled in the art; below in conjunction with accompanying drawing of the present utility model; clear, complete description is carried out to the technical solution of the utility model; based on the embodiment in the application; other roughly the same embodiment that those of ordinary skill in the art obtain under the prerequisite not making creative work, all should belong to the scope of the application's protection.
Embodiment one:
As shown in Figure 1, a kind of compact ultra-short pulse laser long-distance ranging system, comprises LASER Light Source 1, expands module 1, expands module 23, beam splitter 4, transmitting and receiving module 5, catoptron 6, filtration module 7, condenser lens 8 and photodetector 9; Described expand module 1 comprise parallel and with optical axis arrangement lenslet 1 and lenslet 2 22; Described expand module two comprise parallel and with optical axis arrangement large lens 1 and large lens 2 32; Described LASER Light Source 1, lenslet 2 22, lenslet 1, large lens 2 32, large lens 1 and transmitting and receiving module 5 are sequentially arranged on same optical axis, described lenslet 1 and the confocal placement of described large lens 2 32, described large lens 1 and the confocal placement of described transmitting and receiving module 5; Described beam splitter 4 is located between described large lens 1 and large lens 2 32, and is that 45° angle is placed with the optical axis of described large lens 2 32; The side of described beam splitter 4 is located at by described catoptron 6, and with the parallel placement of optical axis of described large lens 2 32; Described filtration module 7 is located at the another side of described beam splitter 4, and with the parallel placement of described catoptron 6; Described condenser lens 8 is parallel with described filtration module 7 and place with optical axis; The focal position of described condenser lens 8 is located at by described photodetector 9.Whole system is simple and compact for structure, cost is low.The utility model adopts launches light path and the coaxial system of receiving light path, the ingenious position relationship that beam splitter 4 and catoptron 6 are set, merely add the sampling that a catoptron 6 can complete main ripple signal, whole system only needs a photodetector 9 can complete the detection of echoed signal and main ripple signal simultaneously.Owing to only adopting a photodetector 9 in whole system, thus realize system compact simple while, avoid and adopt circuit delay time of causing of multiple photodetector 9 different, thus improve the accuracy of whole system range measurement.
Described LASER Light Source 1 is ultrashort pulse laser, and the laser pulse width of output is 10ps, and wavelength is 1064nm, and frequency is 1KHz, and peak power is 1MW, and single pulse energy is 10mJ.Adopt ultrashort pulse laser as LASER Light Source 1, Output of laser power is high, thus beam Propagation distance, therefore the far measuring distance of whole system, meanwhile, the pulse laser pulse width that LASER Light Source 1 exports is narrow, thus time identification is high, therefore the measuring accuracy of whole system is high.
Describedly expand module 1 and described module 23 surface that expands all is coated with film to the laser high permeability that described LASER Light Source 1 exports, transmitance >99.9%; Described lenslet 1 is identical with described lenslet 2 22 parameter, and be small-bore lens, its diameter is 5mm; Described large lens 1 are identical with described large lens 2 32 parameter, and be Large Aperture Lenses, its diameter is 50mm.
Described beam splitter 4 is semi-transparent semi-reflecting lens, and for the laser beam of 45° angle incidence, the light beam transmission of 50%, the light beam of other 50% reflects away from perpendicular to incident direction.
As shown in Figure 2, described transmitting and receiving module 5 is throw face mirror from axle, bore D is 500mm, described bore D is the maximum gauge of light beam light beam after transmitting and receiving module 5 expands, the film that mirror surface, face is coated with the laser high reverse--bias to LASER Light Source 1 output is thrown from axle, when there being directional light incident, light beam is departed from former direction θ angle reflection and is converged to the focal position of throwing face mirror from axle, and fleet angle θ is 30 °;
It is the film of R that described catoptron 6 surface is coated with the laser reflectivity exported LASER Light Source 1, and reflectivity R is 5%;
Described filtration module 7 is narrow band pass filter, the light beam transmission of the laser wavelength only allowing LASER Light Source 1 to export, and the light beam of its all band is stopped, to avoid all the other interference light beams by photoelectric detector;
Described condenser lens 8 surface is coated with the film to the laser high permeability that LASER Light Source 1 exports, and diameter is 60mm;
Described photodetector 9 is avalanche photodide.
The method that the utility model utilizes ultra-short pulse laser long-distance ranging system to carry out finding range comprises the steps:
(1) LASER Light Source 1 Output of laser light beam, laser beam has certain angle of divergence, and single pulse energy is W, and successively after expanding module 1 and large lens 2 32, the bore of described laser beam expands, and completes and expands for the first time, obtains just expanding light beam;
It is (2) described that just expanding light beam incides beam splitter 4, be divided into folded light beam and transmitted light beam, because described beam splitter 4 is semi-transparent semi-reflecting lens, so the single pulse energy of folded light beam is 0.5W, the single pulse energy of transmitted light beam is 0.5W, folded light beam incides catoptron 6 and is reflected, reflectivity due to catoptron 6 is R, therefore the light beam single pulse energy after reflecting from catoptron 6 is 0.5W × R, folded light beam incides beam splitter 4 again, reflected beam part is through after beam splitter 4, the single pulse energy of light beam becomes 0.25W × R, then module 7 and condenser lens 8 after filtering successively, finally incide photodetector 9, obtain main ripple signal,
(3) transmitted light beam that obtains of step (2) is successively after excessive lens 2 32 and transmitting and receiving module 5, and beam size expands again, completes second time and expands, and obtains parallel expanding light beam again;
(4) expand light beam described in be again passed to measuring distance of target at a distance and be reflected back, be launched receiver module 5 and collect and assemble, after excessive lens 1, obtain parallel Returning beam;
(5) described Returning beam incides beam splitter 4, and part Returning beam is reflected onto filtration module 7, then successively through condenser lens 8 and photodetector 9, obtains echoed signal;
(6), after collecting main ripple signal and echoed signal, by contrasting the mistiming of two pulse signals, range measurement is drawn.Due to the multiple reflections of light beam between beam splitter 4 and catoptron 6, photodetector 9 may receive multiple undesired signal, and the single pulse energy of undesired signal is starkly lower than main ripple signal, can judge main ripple signal and undesired signal accordingly.
After the present embodiment catoptron 6 plated film, reflectivity is 5%, and therefore the single pulse energy of described main ripple signal is about 1.25% of the laser beam single pulse energy that LASER Light Source 1 exports.The reflectivity of catoptron 6 is adjusted by the different film of plating, thus the size of the main ripple signal inciding photodetector 9 is adjusted according to the difference of the laser intensity of LASER Light Source 1 output, strong main ripple signal therefore can be prevented the damage of photodetector 9.
Utilize the present embodiment to carry out actual ground telemeasurement, actual range is 958.9 meters, and the result that native system records is 956.1 meters, and accuracy is up to 99.7%.
Embodiment two:
The part that the present embodiment is identical with embodiment one repeats no more, and different parts is:
The laser pulse width that described LASER Light Source 1 exports is 0.1ps, and Output of laser frequency is 10KHz, and peak power is 0.1MW, and single pulse energy is 9mJ; Output of laser power is high, thus beam Propagation distance, the therefore far measuring distance of whole system; Meanwhile, the pulse laser pulse width that LASER Light Source 1 exports is narrow, thus time identification is high, and therefore the measuring accuracy of whole system is high.
Described lenslet 1 is identical with described lenslet 2 22 parameter, and be small-bore lens, its diameter is 2mm; Described large lens 1 are identical with described large lens 2 32 parameter, and be Large Aperture Lenses, its diameter is 10mm; It is described that to throw face aperture of mirror D from axle be 100mm, fleet angle θ be 5 °; Described condenser lens 8 diameter is 10mm; Reflectivity after catoptron 6 plated film is 1%.The reflectivity of catoptron 6 is adjusted by the different film of plating, thus the size of the main ripple signal inciding photodetector 9 is adjusted according to the difference of the laser intensity of LASER Light Source 1 output, strong main ripple signal therefore can be prevented the damage of photodetector 9.
Utilize the present embodiment to carry out actual ground telemeasurement, actual range is 958.9 meters, and the result that native system records is 955.0 meters, and accuracy is up to 99.59%
Embodiment three:
The part that the present embodiment is identical with embodiment one repeats no more, and different parts is:
The laser pulse width that described LASER Light Source 1 exports is 100ps, and peak power is 100MW; Output of laser power is high, thus beam Propagation distance, the therefore far measuring distance of whole system; Meanwhile, the pulse laser pulse width that LASER Light Source 1 exports is narrow, thus time identification is high, and therefore the measuring accuracy of whole system is high.
Described lenslet 1 and described lenslet 2 22 diameter are 20mm; Described large lens 1 and described large lens 2 32 diameter are 200mm; It is described that to throw face aperture of mirror D from axle be 2000mm, fleet angle θ be 80 °; Described condenser lens 8 diameter is 200mm; Described photodetector 9 is single-photon detector; Catoptron 6 plated film back reflection rate is 0.5%.The reflectivity of catoptron 6 is adjusted by the different film of plating, thus the size of the main ripple signal inciding photodetector 9 is adjusted according to the difference of the laser intensity of LASER Light Source 1 output, strong main ripple signal therefore can be prevented the damage of photodetector 9.
Utilize the present embodiment to carry out actual ground telemeasurement, actual range is 958.9 meters, and the result that native system records is 954.3 meters, and accuracy is up to 99.52%.
In addition, be to be understood that, although this instructions is described according to embodiment, but not each embodiment only comprises an independently technical scheme, this narrating mode of instructions is only for clarity sake, those skilled in the art should by instructions integrally, and the technical scheme in each embodiment also through appropriately combined, can form other embodiments that it will be appreciated by those skilled in the art that.
Claims (8)
1. a compact ultra-short pulse laser long-distance ranging system, is characterized in that, comprise LASER Light Source, expands module one, expands module two, beam splitter, transmitting and receiving module, catoptron, filtration module, condenser lens and photodetector;
Described expand module one comprise parallel and with optical axis arrangement lenslet one and lenslet two;
Described expand module two comprise parallel and with optical axis arrangement large lens one and large lens two;
Described LASER Light Source, lenslet two, lenslet one, large lens two, large lens one and transmitting and receiving module are sequentially arranged on same optical axis, described lenslet one and the confocal placement of described large lens two, described large lens one and the confocal placement of described transmitting and receiving module;
Described beam splitter is located between described large lens one and large lens two, and is that 45° angle is placed with the optical axis of described large lens two;
The side of described beam splitter is located at by described catoptron, and with the parallel placement of optical axis of described large lens two;
Described filtration module is located at the another side of described beam splitter, and places with described mirror parallel;
Described condenser lens is parallel with described filtration module and place with optical axis;
The focal position of described condenser lens is located at by described photodetector.
2. a kind of compact ultra-short pulse laser long-distance ranging system according to claim 1, it is characterized in that, described LASER Light Source is ultrashort pulse laser, and the laser pulse width that described ultrashort pulse laser exports is 0.1 ~ 100ps, and peak power is 0.1-100MW.
3. a kind of compact ultra-short pulse laser long-distance ranging system according to claim 1, is characterized in that, described in expand module one and described module two surface that expands all is coated with film to the laser high permeability that described LASER Light Source exports.
4. a kind of compact ultra-short pulse laser long-distance ranging system according to claim 3, it is characterized in that, described lenslet one and described lenslet two diameter are 2 ~ 20mm.
5. a kind of compact ultra-short pulse laser long-distance ranging system according to claim 4, it is characterized in that, described large lens one and described large lens two diameter are 10 ~ 200mm.
6. a kind of compact ultra-short pulse laser long-distance ranging system according to claim 5, it is characterized in that, described beam splitter is semi-transparent semi-reflecting lens.
7. a kind of compact ultra-short pulse laser long-distance ranging system according to claim 6, it is characterized in that, described transmitting and receiving module is throw face mirror from axle, and bore is 100 ~ 2000mm, surface is coated with the film to the laser high reflectance that described LASER Light Source exports, and fleet angle is 5 ° ~ 80 °.
8. a kind of compact ultra-short pulse laser long-distance ranging system according to claim 7, is characterized in that, described condenser lens surface is coated with the film to the laser high permeability that described LASER Light Source exports, and diameter is 10 ~ 200mm.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104865576A (en) * | 2015-06-01 | 2015-08-26 | 中国工程物理研究院激光聚变研究中心 | Compact ultra short pulse laser remote ranging system and ranging method thereof |
| CN107015237A (en) * | 2017-06-12 | 2017-08-04 | 深圳市镭神智能***有限公司 | A kind of sounding optical system |
| CN108427108A (en) * | 2017-12-14 | 2018-08-21 | 北京遥测技术研究所 | A kind of coaxial integrated ray machine of transmitting-receiving for laser ranging system |
| CN110082772A (en) * | 2019-05-05 | 2019-08-02 | 中国科学院国家天文台长春人造卫星观测站 | A kind of signal echo rate satellite laser range-measurement system controllable in real time, method and device |
| CN113687379A (en) * | 2021-07-20 | 2021-11-23 | 国网内蒙古东部电力有限公司 | System for reducing stray light interference of background of receiving light path and interference reduction method thereof |
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2015
- 2015-06-01 CN CN201520365428.6U patent/CN204705715U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104865576A (en) * | 2015-06-01 | 2015-08-26 | 中国工程物理研究院激光聚变研究中心 | Compact ultra short pulse laser remote ranging system and ranging method thereof |
| CN107015237A (en) * | 2017-06-12 | 2017-08-04 | 深圳市镭神智能***有限公司 | A kind of sounding optical system |
| CN108427108A (en) * | 2017-12-14 | 2018-08-21 | 北京遥测技术研究所 | A kind of coaxial integrated ray machine of transmitting-receiving for laser ranging system |
| CN110082772A (en) * | 2019-05-05 | 2019-08-02 | 中国科学院国家天文台长春人造卫星观测站 | A kind of signal echo rate satellite laser range-measurement system controllable in real time, method and device |
| CN110082772B (en) * | 2019-05-05 | 2024-05-17 | 中国科学院国家天文台长春人造卫星观测站 | Satellite laser ranging system, method and device with real-time controllable signal echo rate |
| CN113687379A (en) * | 2021-07-20 | 2021-11-23 | 国网内蒙古东部电力有限公司 | System for reducing stray light interference of background of receiving light path and interference reduction method thereof |
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