Full-aperture long focal-length measurement based on divergent beam

5th International Conference on Advances in Optoelectronics and Micro/Nano-optics

Luo, Jia^1 ; Bai, Jian^1 ; Wang, Kaiwei^1

State Key Laboratory of Modem Optical Instrumentation, Zhejiang University, Hangzhou

310027, China^1

关键词: Collimated beams;    Divergent beams;    Full apertures;    High-accuracy;    Large diameter;    Long focal length measurements;    Ronchi grating;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/680/1/012012/pdf
DOI  :  10.1088/1742-6596/680/1/012012

来源: IOP

【 摘 要 】

A new method for long focal-length measurements is proposed. In this method, we employ divergent beam and two Ronchi gratings of different periods, as the alternative to collimated beams and two identical gratings in traditional method, to realize achieve higher accuracy. Moreover, with divergent beam, the full-aperture measurement is easily realized when detect large diameter lens. The experiments demonstrated the proposed method features high accuracy and repeatability.