Measurement of long focal length based on talbot effect of ronchi grating

被引：0
|
作者：
Hou, CL [1 ]
Bai, J [1 ]
Hou, XY [1 ]
Yang, GG [1 ]
机构：
[1] Zhejiang Univ, State Key Lab Opt Instrument, Micro Syst Ctr Res & Dev, Hangzhou 310027, Zhejiang, Peoples R China
来源：
PROCEEDINGS OF THE SECOND INTERNATIONAL SYMPOSIUM ON INSTRUMENTATION SCIENCE AND TECHNOLOGY, VOL 2 | 2002年
关键词：
Ronchi grating; Talbot effect; moir stripe; focal length measurement;
D O I：
暂无
中图分类号：
O65 [分析化学];
学科分类号：
070302 ; 081704 ;
摘要：
Long focal length measurement is accomplished by obtaining the angle of moire stripe formed by Talbot effect of Ronchi grating. When the Ronchi grating was illuminated by spherical wave (plane wave pass through a lens), the period of the image, which has a relationship with the focal length of the lens, will change. When put another Ronchi grating was put at the place of the Talbot image,. a moire stripe formed and the angle of the moire stripe has a relationship with the focal length. So the focal length can be measured by calculating the angle of the moire stripe. The formula of calculating the long focal, length from the angle of moire stripe has been developed. Error analysis demonstrates that this method can be applied to the real-time testing with high accuracy.
引用
收藏
页码：349 / 353
页数：5
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