A fast and high-precision solution method for rotating biprism based on symmetrical error fitting

A high-precision, double prism technology, applied in the direction of instruments, adaptive control, control/adjustment systems, etc., can solve problems such as low calculation efficiency and complex algorithms, and achieve simple algorithm structure, simplified calculation process, and controllable accuracy strong effect

Active Publication Date: 2022-08-02
INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI
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Problems solved by technology

However, when quickly scanning and tracking the target, forward and reverse calculations are required at the same time. The algorithms in the current literature are complex and the calculation efficiency is low.

Method used

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  • A fast and high-precision solution method for rotating biprism based on symmetrical error fitting
  • A fast and high-precision solution method for rotating biprism based on symmetrical error fitting
  • A fast and high-precision solution method for rotating biprism based on symmetrical error fitting

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Embodiment Construction

[0046] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0047] The following takes the spiral scanning trajectory as an example (refer to the patent of Li Jinying et al.: CN109884791A) to describe in detail the design solving process and effect of the present invention:

[0048] like figure 1 shown, the beam After 4 refractions by two prisms, it points to the target point (Θ t , Φ t ), given the rotation angle of the biprism (θ 1 , θ 2 ), the double-prism control beam deflection process can be simulated by formulas (3)-(5). Since the optical path is reversible, the azimuth Θ pointed by the beam t and the pitch angle Φ t The rotation angle (θ) of the biprism can be reversely solved 1 , θ 2 ). The algorithm of the invention can quickly calculate the rotation angle of the biprism meeting the high precision requirement from the target azimuth and pitch angle.

[0049] like figure 2 As s...

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Abstract

The invention discloses a fast and high-precision solution method for a rotating biprism based on symmetrical error fitting. A first-order approximation method and a vector optics iterative optimization method are respectively used to obtain two sets of beam deflection azimuth and pitch angle curves. Based on the azimuth and elevation curve obtained by the vector optics iterative optimization method, the error correction of the model calculated by the first-order approximation method is carried out. Based on the revised high-precision solution model, the high-precision prism rotation angle is quickly solved by the combination of the bisection method and the two-step method. The algorithm is based on the optimization method of error fitting. After the prism parameters are determined, it is only necessary to adjust the fitted input prism angle and the fitted output azimuth or pitch angle error and perform error fitting correction again. Quickly get high-precision prism rotation angle. The method has a simple structure, avoids a large number of iterative processes used in the traditional accurate solution, greatly simplifies the calculation process, and improves the speed of the solution.

Description

technical field [0001] The invention belongs to the field of optoelectronic system tracking control, and in particular relates to a fast and high-precision solution method for a rotating biprism based on symmetrical error fitting, which is mainly used for quickly solving a dual-prism that meets high-precision requirements during fast beam scanning and tracking control. The prism rotation angle further improves the real-time performance of the scanning and tracking platform. Background technique [0002] Large-scale, fast and high-precision scanning is a key technology in the fields of photoelectric detection, lidar, etc. At present, it is difficult for traditional scanning methods to take into account these indicators. The rotating biprism can be rotated independently by the two prisms coaxially to realize the beam of light. Large-angle deflection control has the characteristics of compact structure, high rigidity and rapid response. Regarding the calculation methods betwee...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05B13/04
CPCG05B13/042
Inventor 李锦英秦聪明夏华阳彭关龙袁良柱温飘张清明陈科
Owner INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI
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