RESEARCH ON THE MOIRÉ FRINGES FORMED BY CIRCULAR GRATING AND LINEAR GRATING
Chen Xiaoyu, Su Jinbo, Cao Xiangqun, Lin Bin, Yuan Bo
Abstract:
The features of moiré fringe, which is generated by overlapping a circular grating and a linear grating, were studied by ordinal number equation in this paper. Given that the pitch of circular grating is a and that of linear grating is p, the figures of moiré fringe formed by them are hyperbola, parabola and ellipse when a > p, a = p and a < p, respectively. As the pitches of these two gratings are close to each other, magnification of moiré fringe is over 100, which is useful for the measurement of a small displacement. However, the shape of moiré fringe will no longer be distinguishable at the same time. Besides, the larger the fill factor is, the lower the visibility of moiré fringe is. The recommended range of grating parameters was also given to attain to an ideal observation result in the paper.
Keywords:
moiré fringe, circular grating, linear grating, pitch
Download:
IMEKO-TC2-2010-17.doc
DOI:
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Event details
IMEKO TC:
TC2
Event name:
TC2 Symposium 2010
Title:
19th Symposium on Photonic Measurements
Place:
Hangzhou, CHINA
Time:
11 September 2010 - 13 September 2010
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