一种新的圆光栅偏心参数自标定方法  

New self-calibration method of circular grating eccentric parameters

作　　者：冯超鹏 祝连庆[1,2] 潘志康[1,2] 郭阳宽[1,2] 

机构地区：[1]北京信息科技大学光电测试技术北京市重点实验室,北京100101 [2]北京信息科技大学光电信息与仪器北京市工程研究中心,北京100101

出　　处：《仪器仪表学报》2016年第11期2459-2464,共6页Chinese Journal of Scientific Instrument

基　　金：国家自然科学基金(51075038;51375057);国家重大科学仪器设备开发专项(2013YQ22089304);长江学者和创新团队发展计划(IRT1212)项目资助

摘　　要：圆光栅安装偏心误差对圆光栅编码器的角度测量精度有较大影响,对偏心误差进行补偿可以有效提高测量结果的精度。为了对圆光栅的安装偏心参数进行辨识,建立了双读数头的偏心误差模型,推导出了基于双读数头的圆光栅偏心参数的自标定公式。通过实验利用对径安装的两个读数头对圆光栅的偏心参数进行自标定,求解出了相关的偏心参数,并使用正十二面棱体搭建的实验装置,对自标定参数的补偿效果进行了验证。实验结果表明,用双读数头自标定公式标定出的偏心参数对单读数头的测量结果进行偏心误差补偿后,圆光栅的平均误差从补偿前的0.046 4°减小到了0.003 7°。The installation eccentric error of circular grating has great impact on the angle measurement accuracy of circular grating encoder. And the accuracy of the measurement results of the circular grating encoder can be effectively improved by compensating the eccentric error. To identify the installation eccentric error parameters of circular grating,an eccentric error model with two photoelectric detectors is established and the self-calibration formula of the eccentric parameters based on two photoelectric detectors is deduced. The eccentric parameters were self-calibrated in experiments using the two photoelectric detectors installed diametrically,the related eccentric parameters were solved,and an experiment device with dodecahedron was used to verify the compensation effect of the self-calibration parameters. The experiment result shows that after compensating the eccentric error measured with single photoelectric detector using the eccentric parameters calibrated with the self-calibration formula of two photoelectric detectors the average error of the circular grating is decreased from 0. 064 6° to 0. 003 7°.

关 键 词：圆光栅角度编码器 偏心误差 自标定 双读数头 

分 类 号：TH712[机械工程—测试计量技术及仪器]