Assembly Error Analysis of Laser Tracking Steering Prisms with Sub-microradian Order Accuracy

doi:10.3901/JME.2016.10.009

Abstract

Abstract: Focusing on the issue of the sub-microradian order tracking accuracy of cascade tilting prisms, the analysis method of the assembly error of spatial orthogonal optical system is proposed. Based on the vector form Snell’s law for ray tracing, a normalized mathematical model of the prism assembly error is established, the influence of different error factors on beam tracking field is analyzed, and the quantitative analysis for the beam pointing error is carried out. For prism Π₁, if the inclination angle relative to y axis is greater than 0.08″, the error of vertical angle ρ_V for emergent light emergent light reaches 0.21 μrad, if the inclination angle relative to x axis is greater than 0.2″, the error of horizontal angle ρ_H for emergent light emergent light reaches 0.5 μrad. For prism Π₂, if the inclination angle relative to z axis is greater than 0.2″,the error of horizontal angle ρ_H for emergent light reaches 0.22 μrad, but the bearing assembly errors has little influence on the beam pointing errors. The study results has a great theoretical significance on the development of high-accuracy optical system.

Key words: assembly errors, laser tracking, optical device, sub-microradian order

CLC Number:

TH74

LI Anhu, ZUO Qiyou, BIAN Yongming, LIU Hongzhan, LIU Liren. Assembly Error Analysis of Laser Tracking Steering Prisms with Sub-microradian Order Accuracy[J]. Journal of Mechanical Engineering, 2016, 52(10): 9-16.

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