Laser dot matrix device for obstacle avoidance of lunar rover

Abstract

The invention discloses a laser dot matrix device for the obstacle avoidance of a lunar rover. The laser dot matrix device consists of lasers, a power circuit, a calibrator, a Dammann grating, a reflector and a prism group, wherein the calibrator, the grating, the reflector and the prism group form an optical probe part; the prism group consists of nine trapezoidal direction regulation prisms; and the lasers are driven by the power circuit with a constant current source. The lasers transmit laser to the calibrator on the optical probe part for calibration through optical fibers, the calibrated laser is split into nine paths of light beams by the Dammann grating, the nine paths of light beams are steered by the reflector, the nine paths of steered light beams are refracted by the nine corresponding trapezoidal direction regulation prisms, emergent directions are changed and a laser dot matrix is formed finally. By the laser dot matrix device, the bottleneck problems of relatively larger volume, relatively heavier weight, interval and energy non-uniformity and the like of a conventional grating system or a conventional prism group system are solved; and diffraction efficiency is over 72.5 percent.

Description

technical field [0001] The invention relates to a laser dot array device, in particular to a laser dot array device for lunar vehicle obstacle avoidance, and belongs to the field of lunar vehicle design. Background technique [0002] The laser dot matrix device is used in the CE-3 patrol device, and the emitted laser forms a projection dot matrix on the lunar surface to provide a feature mark for the front obstacle avoidance camera and serve the navigation task of the GNC sub-system of the patrol device. [0003] The laser dot matrix device is composed of a drive circuit box and a grating assembly, specifically including 2 LDs and drive circuits, 2 collimators, 2 mirrors, 2 grating lenses and 2 miniaturized prism groups. LD, electronic circuit and fiber reel are placed in the line box, the grating assembly is connected to the side wall of the line box, the fiber outlet protrudes from the side wall, the laser beam enters the grating after being reflected by the collimator and...

AI Technical Summary

Problems solved by technology

[0008] Among them, scheme (1) requires three LDs, two beam splitters, and seventeen collimators; scheme (2) requires the use of a 500mw 974nm laser, which is currently difficult to purchase; scheme (3) is less efficient (area ratio ) is 17%, and it is difficult to purchase high-power devices. This scheme is difficult to realize unless the light spots are arranged in a circle; scheme (4) there are too many prism glued surfaces, and the mechanical resistance is poor

The common disadvantages of the above solutions are: large volume, heavy weight, high power consumption

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