A compact ultrashort pulse laser remote ranging system and its ranging method

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...

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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