高定位精度转台检测系统调整误差补偿

Compensation for adjustment error in high positioning accuracy turntable measuring system

某用于实验室激光通信实验的转台要求具有±1.5″的定位精度,为了对该高定位精度转台实施检测,搭建了由24面棱体、定心装置、0.2″二维光电自准直仪和支架组成的高精度测角系统,对该测角系统进行了准直误差理论分析。结果表明:多面棱体偏心对定位精度的测量结果影响很小,一般可以忽略,但自准直仪的调整误差对高定位精度的测量影响很大。为了消除该系统误差,在理论分析的基础上,提出了一种基于角度标定的调整误差补偿的方法并进行了实验验证。通过精细调整减小调整误差方法测得转台定位精度σ为0.936″,而采用新补偿调整误差方法测得定位精度σ″为0.922″,σ″相对σ的相对误差为-1.496%,且满足转台定位精度要求。实验结果证明了本文方法的快速性和可靠性。

A turntable to be used in laser communication laboratory experiments needs positioning accuracy of ±1. 5″. In order to check the technical requirements, a high accuracy angle measurement system, composed of regular polygon error, centering device, 0. 2″ two-dimensional optoelectronic autocollimation and supporting, was set up. The collimation error of the system was theoretically analyzed, which shows that the off-center between the regular polygon mirror and the turntable contributes little impact on the positioning accuracy of the measurement results, which generally can be ignored. However, the adjustment error of the autocollimation has great influence on the measurement system. In order to eliminate the system error, on the basis of theoretical analysis, a new method based on data processing to compensate the adjustment error was proposed and verified by contrast experiments. Results show that a positioning accuracyσ=0. 936″, was obtained by timing experiential fine adjustment, while the positioning accuracy σ = 0. 922″ was obtained by the proposed new method. The relative error between σ″ and σ is -1. 496%, which satisfies the technical requirement. Contrast experiments also demonstrate that the proposed method is convenient and reliable.