Uni-axial measurement of three-dimensional surface profile by liquid crystal digital shifter

Yukitoshi Otani; Fumio Kobayashi; Yasuhiro Mizutani; Shuugo Watanabe; Manabu Harada; Toru Yoshizawa

doi:10.1117/12.861561

2 August 2010 Uni-axial measurement of three-dimensional surface profile by liquid crystal digital shifter

Yukitoshi Otani, Fumio Kobayashi, Yasuhiro Mizutani, Shuugo Watanabe, Manabu Harada, Toru Yoshizawa

Proceedings Volume 7790, Interferometry XV: Techniques and Analysis; 77900A (2010) https://doi.org/10.1117/12.861561
Event: SPIE Optical Engineering + Applications, 2010, San Diego, California, United States

Abstract

A uni-axial measurement of three dimensional surface profiles by a liquid crystal digital shifter is proposed using a telecentric optical system. Height information is captured by measuring the contrast in the projected pattern. A shadow less measurement of the object's area is archived by using a uni-axial system. The magnification of the object image captured by a CCD camera is made constant by changing the focus distance. The liquid crystal digital shifter is a powerful tool to make arbitrary intensity and frequency distribution. Surface profiles of mechanical parts were measured to demonstrate this method.

Citation Download Citation

Yukitoshi Otani, Fumio Kobayashi, Yasuhiro Mizutani, Shuugo Watanabe, Manabu Harada, and Toru Yoshizawa "Uni-axial measurement of three-dimensional surface profile by liquid crystal digital shifter", Proc. SPIE 7790, Interferometry XV: Techniques and Analysis, 77900A (2 August 2010); https://doi.org/10.1117/12.861561

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