Apparatus for measuring parallelism of laser rangefinder sighting and receiving axes based on liquid crystal modulation

Abstract

The invention relates to a device for measuring parallelism of sight axis and reception axis of a laser range finder based on liquid crystal modulation, which belongs to the technical field of optical precision measurement. The device comprises an off-axis parabolic mirror, a liquid crystal spatial light modulator, an integrating sphere, a visible light source, an optical fiber A, a laser delay module, an optical fiber B and a coupler, wherein the liquid crystal spatial light modulator is disposed on the focal plane of the off-axis parabolic mirror; the liquid crystal spatial light modulator, the integrating sphere, the optical fiber A, the laser delay module, the optical fiber B and the coupler are sequentially disposed behind the focal plane, and the coupler is connected with a laser emitter; and the visible light source is connected with the integrating sphere. The detection device uses the liquid crystal to perform electro-optical modulation to generate surface target for optoelectronic scanning. The invention can be used for rapid detection of the parallelism of sight axis and reception axis of the laser range finder in both indoor and outdoor environments; and has the advantages of high measurement success ratio, high precision and portability.

Description

technical field [0001] The invention is a liquid crystal modulation-based laser rangefinder aiming and receiving axis parallelism measuring device, which can be used for rapid detection of the parallelism between the aiming axis and receiving axis of a laser rangefinder in indoor and outdoor environments, and belongs to optical precision measurement technology field. technical background [0002] The pulse laser range finder has high measurement accuracy, long working distance and strong anti-interference ability, and has been widely used in various fields. For laser range finders, its main performance parameters are divergence angle, energy, pulse width, emission frequency (for repetition frequency lasers), accurate measurement rate, false alarm rate, angular resolution, distance resolution and three-axis (aiming optical axis , Emitting optical axis, receiving optical axis) parallelism, etc. Among them, performance indicators such as divergence angle, energy, and pulse wi...

AI Technical Summary

Problems solved by technology

However, since this method uses a point target for two-dimensional scanning, and the corresponding point of the receiving axis of the measured rangefinder on the focal plane is also very small, it is difficult for the two to coincide, so the measurement process is more complicated

And because the device uses electromechanical scanning, the accuracy of mechanical parts is difficult to guarantee in a vibrating environment

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