A new phase shifting shadow moiré method for out-of-plane displacement measurement

Fujun Yang; Wei Sun; Chengjun Gu; Xiaoyuan He

doi:10.1117/12.621670

12 April 2005 A new phase shifting shadow moire method for out-of-plane displacement measurement

Fujun Yang, Wei Sun, Chengjun Gu, Xiaoyuan He

Proceedings Volume 5852, Third International Conference on Experimental Mechanics and Third Conference of the Asian Committee on Experimental Mechanics; (2005) https://doi.org/10.1117/12.621670
Event: Third International Conference on Experimental Mechanics and Third Conference of the Asian Committee on Experimental Mechanics, 2004, -, Singapore

Abstract

It is well known that the introduction of a phase-shifting procedure may give a better resolution in optical techniques. This paper presents a new digital shadow moire method with phase-shifting based on liquid crystal display (LCD) projector. The first one of four computer-generated phase-shifting fringe patterns is projected on the surface of testing object while all fringe patterns are sequentially projected on a planar plate for generating phase-shifting moire fringes, which are formed by the projected phase-shifting fringe patterns subtracting with the deformed fringe pattern in sequence. This new method provides many advantages in performing topography and out-of-plane displacement measurement. First, the spatial line period and phase step is readily adjusted to suit the measurement precision. Second, the measuring speed is relatively fast and suit for dynamic testing because the digital phase shifting is no time-consuming comparing with other phase-shifting techniques. The experimental performance on out-of-plane displacement measurement of a cantilever beam well demonstrates the validity of the new method.

Citation Download Citation

Fujun Yang, Wei Sun, Chengjun Gu, and Xiaoyuan He "A new phase shifting shadow moire method for out-of-plane displacement measurement", Proc. SPIE 5852, Third International Conference on Experimental Mechanics and Third Conference of the Asian Committee on Experimental Mechanics, (12 April 2005); https://doi.org/10.1117/12.621670

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