Cascaded acousto-optic wide-field laser 3D imaging system based on full waveform sampling

Abstract

The invention discloses a LFOV (large field of view) type cascade acousto-optic laser three-dimensional imaging system based on full waveform sampling. The laser three-dimensional imaging system comprises a laser source module, a cascade acousto-optic scanning, transmitting and receiving optical module, a multi-channel high-speed laser detection module, a general control module, a host computer and a power module. Through waveform sampling, analysis and processing of laser echo signals, echo information reflected by laser echo signals of a target is extracted, compared with a traditional threshold discrimination extraction method, the extraction method for the laser echo signals of the target is more intelligent, the capacity of the system for resisting ambient interference such as haze, dust, camouflage net shielding and the like is improved, and the application range of the laser three-dimensional imaging system is expanded. Compared with traditional mechanical scanning, an adopted cascade acousto-optic scanning device has the advantages that the deflection speed is high, mechanical vibration is avoided, a drive control mode is flexible and the like, the resolution of the laser three-dimensional imaging system in a pitching direction is flexibly adjusted, and detection for targets with difference distances and different resolutions can be realized.

Description

technical field [0001] The invention relates to the technical field of laser three-dimensional imaging, in particular to a cascaded acousto-optic large-field laser three-dimensional imaging system based on full waveform sampling. Background technique [0002] Laser three-dimensional imaging technology can perceive the three-dimensional information of the surrounding environment in real time. It has the advantages of fast imaging speed, certain operating distance and imaging range, and high measurement accuracy. It can simultaneously obtain information such as the distance, orientation, and relative movement speed of the target. Widely used in driving, machine vision and other fields. The existing unmanned and machine vision laser 3D imaging technology is mostly applied to the multi-line scanning laser radar based on the time-of-flight measurement principle, which has weak anti-environmental interference ability and short action distance. In the pitch direction, its angular r...

AI Technical Summary

Problems solved by technology

The existing unmanned and machine vision laser 3D imaging technology is mostly applied to the multi-line scanning lidar based on the time-of-flight measurement principle, which has weak anti-environmental interference ability and short action distance. In the pitch direction, its angular resolution is fixed , resulting in low resolution of long-distance targets, which is not conducive to obstacle detection and recognition, which greatly limits the application of this technology, and at the same time, it also brings safety hazards to unmanned vehicles

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