Laser radar receiving optical system based on optical micro switch

Abstract

The invention discloses a laser radar receiving optical system based on an optical micro switch. The laser radar receiving optical system comprises an imaging optical assembly, the optical micro switch and a stray light feedback assembly. The imaging optical assembly is used for imaging scanning points in a view field range; and the optical micro switch is located in front of the focus of the imaging optical assembly and comprises a plurality of sub-switches, and each sub-switch can be switched on and switched off independently. Transmission of light in a specific view field can be realized by controlling switching on and switching off of each sub-switch on the optical micro switch. The stray light feedback assembly can obtain the positions of signal light and stray light inside and outside the field of view on the optical micro switch through the switching on and switching off information of the sub-switches on the optical micro switch and the image gray scale information of different positions of the stray light feedback assembly. Transmission of the signal light and scattering of the stray light are achieved by controlling the switching on and switching off of the sub-switches at the corresponding positions on the optical micro switches. The system is simple in structural form, can accurately recognize the positions of the signal light and stray light inside and outside the field of view, and can assist in overcoming the problem that a traditional laser radar receiving optical system is difficult to suppress stray light in the field of view.

Description

technical field [0001] The invention belongs to the technical field of laser radar receiving optical systems, in particular to a laser radar receiving optical system based on an optical micro switch. Background technique [0002] During the planetary landing process, the probe needs to accurately identify the three-dimensional terrain of the planetary surface, so as to accurately navigate and avoid obstacles. In order to provide a larger maneuvering range for the detector, the obstacle avoidance sensor needs to have a longer working distance and a stronger ability to suppress stray light. [0003] The receiving optical system of the obstacle avoidance sensor focuses the scattered laser array scanning point energy on the chip. The receiving optical system must have super strong stray light suppression ability to meet the long-distance terrain recognition of the obstacle avoidance sensor. [0004] The traditional laser radar receiving optical system often uses a hood to supp...

AI Technical Summary

Problems solved by technology

The hood can only suppress the stray light outside the field of view, and has no effect on the stray light in the field of view; the filter has a certain effect on suppressing the stray light in the field of view and the signal light in different spectrum bands, but the filter The chip cannot suppress the stray light in the same spectrum as the signal

In addition, because the optical system has a certain field of view, the bandwidth of the filter cannot be made very narrow, so the stray light within the bandwidth cannot be effectively suppressed

[0005] Therefore, the above traditional methods cannot achieve effective suppression of stray light inside and outside the field of view.

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