CAJ | 학술논문

根据望远镜测角系统的精度需求，分析了影响拼接式编码器测角精度的误差源，以及多读数头测角消差原理，确定了采用相位相差90°的4读数头的测角方式。在某望远镜方位轴系转台进行了逆时针和顺时针方向的测角试验，通过对测角数据进行谐波分析并补偿后，得到两组实验测角误差RMS分别为0．34″、0．38″。实验表明，相位相差90°的均布4读数头的测角方式消除了由轴系误差、编码器安装位置误差和钢带安装盘部分圆度误差对测角精度的影响，实现了亚角秒级测角的目的。研究结果可用于大口径望远镜设计阶段的误差分析与分配、预估测角精度，为降低设计和加工误差提供参考。
근거망원경측각계통적정도수구，분석료영향병접식편마기측각정도적오차원，이급다독수두측각소차원리，학정료채용상위상차90°적4독수두적측각방식。재모망원경방위축계전태진행료역시침화순시침방향적측각시험，통과대측각수거진행해파분석병보상후，득도량조실험측각오차RMS분별위0．34″、0．38″。실험표명，상위상차90°적균포4독수두적측각방식소제료유축계오차、편마기안장위치오차화강대안장반부분원도오차대측각정도적영향，실현료아각초급측각적목적。연구결과가용우대구경망원경설계계단적오차분석여분배、예고측각정도，위강저설계화가공오차제공삼고。
According to the accuracy specifications of telescope goniometry, error sources of sacle tape grating encoder and the angle measuring principle of multi reading head are analyzed.A 4-reading heads angle meas-urement program which have 90°phase difference, have been developed.And we make counterclockwise and clockwise angle measuring experiments on an azimuth turntable of telescope through harmonic processing and error compensation, and two sets of experiments measuring angle error RMS values of 0.42″and 0.41″are ob-tained.Experiment results show that the effect of shafting errors, processing error of installation position and partly roundness error for installation torus on the angular measurement accuracy is eliminated by harmonic processing and phase difference method, and high precision angle measurement with sub-arc-second-accuary is achieved.The research results are useful for analyzing and distributing errors, forecasting angle measuring ac-curacy and reducing design and machining errors in the design of large aperture telescopes.