【作者】 孙琛； 沈亦兵； 白剑； 侯西云； 杨国光；

【Author】 Sun Chen Shen Yibing Bai Jian Hou Xiyun Yang Guoguang (State Key laboratory of Optical Instrument,Zhejiang University,Hangzhou 310027)

【机构】 浙江大学现代光学仪器国家重点实验室；

【摘要】 针对基于Ronchi光栅Talbot效应的长焦距测量方法,分析了利用傅立叶变换求取莫尔条纹角度的精度限制,提出了通过傅立叶变换的多次迭代逼近来提高角度计量精度,从而提高长焦距测量精度的方法。并在此基础上分析了这种方法的精度极限。更多还原

【Abstract】 Based on the long focal length testing method which applies the Talbot effect of Ronchi grating,theprecision limit resulted from the cross angle of Moire fringes obtained by Fourier transform is analyzed. Amethod is presented to improve the precision of angle testing,which is carried out by multi-calculation of Fouriertransform to approximate the target angle,this can greatly improve the precision of long focal length measurement.In the presentation,the precision limit was detailed analyzed.更多还原