Compact ultra short pulse laser remote ranging system and ranging method thereof

A technology of ultra-short pulse laser and ranging system, which is applied in radio wave measurement system, measuring device, electromagnetic wave re-radiation, etc. It can solve the requirements of high output energy of laser, reduce the measurement accuracy of ranging system, and the energy consumption demand of laser light source Large problems, to achieve the effect of avoiding different circuit delay times, low cost, and narrow pulse width

Inactive Publication Date: 2015-08-26
LASER FUSION RES CENT CHINA ACAD OF ENG PHYSICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this design only needs a large-aperture lens, a photodetector is added to the sampling of the main wave signal, and the main wave signal and the echo signal need to pass through different photodetector systems, and there must be a circuit delay The discrepancy can severely impact signal processing, reducing the measurement accuracy of ranging systems
[0007] In the existing long-range laser ranging system for ground objects, the laser light source used is generally a laser output with a nanosecond pulse width, and its measurement accuracy is difficult to improve due to the limitation of the laser pulse width; at the same time, for ultra-long-distance laser measurement The output pulse laser needs to have a very high peak power, which makes the output energy of the laser very high, which makes the energy consumption of the laser light source very large, and the system is complex and bulky.

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  • Compact ultra short pulse laser remote ranging system and ranging method thereof
  • Compact ultra short pulse laser remote ranging system and ranging method thereof

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Effect test

Embodiment 1

[0046] like figure 1As shown, a compact ultra-short pulse laser long-distance ranging system, including laser light source 1, beam expander module 1 2, beam expander module 2 3, beam splitter 4, transmitting and receiving module 5, reflector 6, filter module 7 , a focusing lens 8 and a photodetector 9; the beam expander module one 2 includes small lenses one 21 and two small lenses 22 arranged parallel to the optical axis; the second beam expander module includes large lenses arranged parallel to the optical axis Lens one 31 and large lens two 32; the laser light source 1, small lens two 22, small lens one 21, large lens two 32, large lens one 31 and transmitting and receiving module 5 are arranged on the same optical axis in sequence, and the The first small lens 21 and the second large lens 32 are confocally placed, and the first large lens 31 is placed confocally with the transmitting and receiving module 5; the beam splitter 4 is arranged on the first large lens 31 and the...

Embodiment 2

[0065] The same parts of this embodiment and Embodiment 1 will not be repeated, and the different parts are:

[0066] The laser pulse width output by the laser light source 1 is 0.1ps, the output laser frequency is 10KHz, the peak power is 0.1MW, and the single pulse energy is 9mJ; the output laser power is high, so the beam transmission distance is long, so the measurement distance of the whole system is long ; At the same time, the pulsed laser pulse width output by the laser light source 1 is narrow, so that the time resolution is high, so the measurement accuracy of the whole system is high.

[0067] Described small lens one 21 and described small lens two 22 parameters are identical, are small aperture lens, and its diameter is 2mm; Described large lens one 31 and described large lens two 32 parameters are identical, are large aperture lens, and its diameter is 2mm 10 mm; the diameter D of the off-axis parabolic mirror is 100 mm, and the deviation angle θ is 5°; the diame...

Embodiment 3

[0070] The same parts of this embodiment and Embodiment 1 will not be repeated, and the different parts are:

[0071] The laser pulse width output by the laser light source 1 is 100 ps, ​​and the peak power is 100 MW; the output laser power is high, so the beam transmission distance is long, so the measurement distance of the whole system is long; meanwhile, the pulse laser pulse width output by the laser light source 1 is narrow, Therefore, the time resolution is high, so the measurement accuracy of the whole system is high.

[0072] The small lens one 21 and the small lens two 22 have a diameter of 20 mm; the large lens one 31 and the large lens two 32 have a diameter of 200 mm; the off-axis parabolic mirror diameter D is 2000 mm, and the deviation angle θ is 80°; the diameter of the focusing lens 8 is 200 mm; the photodetector 9 is a single-photon detector; the reflection rate of the mirror 6 after coating is 0.5%. The reflectivity of the reflector 6 is adjusted by plating...

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Abstract

The invention discloses a compact ultra short pulse laser remote ranging system and a ranging method thereof. The system comprises a laser source, a first beam expanding module, a second beam expanding module, a beam splitter, a transmitting and receiving module, a reflector, a filter module, a focusing lens, and a photodetector, wherein the laser source is an ultra short pulse laser transmitting laser beams, and the width of the outputted laser pulse is picosecond to subpicosecond. The system whose transmitting light path and receiving light path are coaxial is adopted, one reflector is adopted to complete sampling of main wave pulse signals; through changing coating reflectivity of the reflector, the size of an incident main wave signal is adjusted, and over strong main wave pulse signals can be prevented from damaging the photodetector; and the laser ranging system is long in ranging, high in ranging precision, simple and compact in structure, and low in cost.

Description

technical field [0001] The invention relates to the technical field of pulse laser ranging, in particular to a compact ultrashort pulse laser remote ranging system and a ranging method thereof. Background technique [0002] Pulse laser ranging refers to a measurement technology that uses pulsed laser beams fired at the ranging target to measure the distance of the target. The laser ranging system generally includes: a laser light source, a laser emitting system, a laser echo receiving system, and a signal detection processing and control system. [0003] The laser light source emits a pulsed laser beam. After passing through the laser emitting system, most of the laser beam is emitted to the direction of the ranging target. After the emitted laser beam is reflected by the ranging target, it returns a relatively weak echo laser beam. The echo laser beam The photodetector of the receiving optical system is received as an echo pulse signal; a small part of the laser beam is sa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S17/08G01S7/481
CPCG01S7/4812G01S17/08
Inventor 朱启华邓颖康民强王方李富全张永亮许党朋王少奇郑建刚张雄军胡东霞粟敬钦郑奎兴郑万国
Owner LASER FUSION RES CENT CHINA ACAD OF ENG PHYSICS
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