Ronchi光栅Talbot效应长焦距测量的准确度极限研究

The Precision Limit Analysis of Long Focal Length Testing Based on Talbot Effect of Ronchi Grating

针对基于Ronchi光栅Talbot效应的长焦距测量方法 ,分析了利用傅里叶变换求取莫尔条纹角度的准确度限制 ,提出了通过傅里叶变换的多次迭代逼近来提高角度计量准确度 ,从而提高长焦距测量准确度的方法 。

Based on the long focal length testing method which applies the Talbot effect of Ronchi grating,the precision limit resulted from the cross angle of Moire fringes obtained by Fourier transform is analyzed. A method is presented to improve the precision of angle testing,which is carried out by multi-calculation of Fourier transform to approximate the target angle,it can greatly improve the precision of long focal length measurement. In the presentation,the precision limit is detailed analyzed.