Rotating prism device for coarse and fine two-stage scanning

Abstract

The invention relates to a coarse and fine scanning rotating prism device, which comprises a prism and an inner and outer prism frame assembly, a worm and gear movement mechanism, a rotary motor, a yaw motor and a rotating half shaft assembly, an anti-backlash motor and an anti-backlash gear assembly, a rotary encoder assembly, a deflection encoder assembly, a rectangular frame and a base, wherein the rotary motor drives the prism and the inner and outer prism frame assembly through the worm and gear mechanism to realize full circumferential rotation, and the yaw motor is directly coupled with the rectangular frame to realize the yaw movement of the prism and the inner and outer prism frame assembly; and the whole device is arranged on the base. The prism is driven by the worm and gear mechanism to realize the full circumferential large-range rotation, and the coarse scanning requirements of dynamic beams are met; and a rotary movement mechanism and a yaw movement mechanism are nested to be combined, so that the integration of coarse and fine scanning functions is skillfully realized in a single set of devices, and the problems that the dispersal spatial structure is brought by a coarse and fine scanning separation design and the coarse and fine error term of the system is difficult to separate and traceably amend are avoided.

Description

technical field [0001] The invention relates to an optical transmission system, in particular to a rotating prism device for realizing rough and fine two-stage scanning. Background technique [0002] Refractive prism scanning mechanism has a wide range of uses in dynamic optical tracking, which can accurately realize the alignment of optical paths, tracking of measured objects, compensation and correction of beam pointing errors, etc. [0003] (1) The application and structural composition of the rotating prism scanning device are given in the following prior art. [0004] The prior art (Xiaodong Tao, etc., "Active optical system for variable view imaging of micro objects with emphasis on kinematic analysis", Applied Optics, 2008, 47(22):4121-4132, etc. series of articles) uses a rotating double prism Realize variable field of view imaging scanning of micro-objects; prior technology (Mario Tirabassi, etc., "Scanning LDV using wedge prisms", Optics and Lasers in Engineerin...

AI Technical Summary

Problems solved by technology

In fact, when designing the nested mechanism of prism rotation and yaw, the error transmission of the two-stage motion should be reduced as much as possible. On the basis of the rotation motion, the system adopts the implicated yaw method of three modules, and the More mechanical errors will accumulate, which will affect the accuracy of prism scanning

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