Angle measurement error and compensation for decentration rotation of circular gratings  

作　　者：陈希军 王振桓 曾庆双 

机构地区：[1]Space Control and Inertial Technology Research Center,Harbin Institute of Technology

出　　处：《Journal of Harbin Institute of Technology(New Series)》2010年第4期536-539,共4页哈尔滨工业大学学报（英文版）

基　　金：Sponsored by the Eleventh Five-year Plan Defense Pre-research Fund ( Grant No 51309040201)

摘　　要：As the geometric center of circular grating does not coincide with the rotation center,the angle measurement error of circular grating is analyzed. Based on the moire fringe equations in decentration condition,the mathematical model of angle measurement error is derived. It is concluded that the decentration between the centre of circular grating and the center of revolving shaft leads to the first-harmonic error of angle measurement. The correctness of the result is proved by experimental data. The method of error compensation is presented,and the angle measurement accuracy of the circular grating is effectively improved by the error compensation.As the geometric center of circular grating does not coincide with the rotation center, the angle measurement error of circular grating is analyzed. Based on the moire fringe equations in decentration condition, the mathematical model of angle measurement error is derived. It is concluded that the deeentration between the centre of circular grating and the center of revolving shaft leads to the first-harmonic error of angle measurement. The correctness of the result is proved by experimental data. The method of error compensation is presented, and the angle measurement accuracy of the circular grating is effectively improved by the error compensation.

关 键 词：circular grating DECENTRATION moire fringe first-harmonic error 

分 类 号：V241[航空宇航科学与技术—飞行器设计]