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Proceedings Paper

Defocus measuring the focal length of microlens array by grating prismatic interference
Author(s): Xianchang Zhu; Xuedong Cao; Shibin Wu; Fan Wu
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Paper Abstract

Microlens-arrays have been used in many fields; it's difficult to measure the focal length by traditional method. This paper introduces a new technique for the focal length measurement. Place the grating close-by the focal point and make the +1 order and 0 order rays diffracted from the grating interfering, from the number of interference stripe we can get the grating defocus, ulterior finish the focal length testing. In this paper, we enumerate the expression between the defocusing and the interference stripe number. At the same time, we make an experiment to prove the feasibility. The experiment result shows that this technique has a higher testing accuracy and efficiency as opposed to traditional method.

Paper Details

Date Published: 9 November 2010
PDF: 8 pages
Proc. SPIE 7849, Optical Design and Testing IV, 78491D (9 November 2010); doi: 10.1117/12.868326
Show Author Affiliations
Xianchang Zhu, Institute of Optics and Electronics (China)
Xuedong Cao, Institute of Optics and Electronics (China)
Shibin Wu, Institute of Optics and Electronics (China)
Fan Wu, Institute of Optics and Electronics (China)

Published in SPIE Proceedings Vol. 7849:
Optical Design and Testing IV
Yongtian Wang; Julie Bentley; Chunlei Du; Kimio Tatsuno; Hendrik P. Urbach, Editor(s)

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