Focal length measurement based on the wavefront difference method by a Fizeau interferometer

被引：16
|
作者：
Yang, Zhongming [1 ]
Gao, Zhishan [1 ]
Dou, Jiantai [1 ]
Wang, Xinxing [1 ]
机构：
[1] Nanjing Univ Sci & Technol, Sch Elect Engn & Photoelect Technol, Nanjing 210094, Jiangsu, Peoples R China
来源：
APPLIED OPTICS | 2014年 / 53卷 / 25期
基金：
中国国家自然科学基金;
关键词：
SHEARING INTERFEROMETRY; OPTICAL-SYSTEMS;
D O I：
10.1364/AO.53.005598
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
A method for measuring the focal length of the lens by a Fizeau interferometer is proposed. Based on the Gaussian imaging equation and the longitudinal displacements of the object point and image point, a precise formula for focal length calculation is deduced. The longitudinal displacement of the object points is determined by the wavefront difference method with a subnanometer resolution. An experimental system for focal length measurements is set up to verify the principle. The sources of uncertainty in measurement are discussed. Both the positive and negative lens experimental results indicate that the measurement accuracy is less than 0.16% under normal experimental environment. (C) 2014 Optical Society of America
引用
收藏
页码：5598 / 5605
页数：8
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