Tunable-microlens-based multipoint diffraction strain sensor

Hui Zhu; Anand Asundi

doi:10.1117/12.851663

14 April 2010 Tunable-microlens-based multipoint diffraction strain sensor

Hui Zhu, Anand Asundi

Proceedings Volume 7522, Fourth International Conference on Experimental Mechanics; 75220M (2010) https://doi.org/10.1117/12.851663
Event: Fourth International Conference on Experimental Mechanics, 2009, Singapore, Singapore

Abstract

Multipoint Diffraction Strain Sensor (MDSS) is a novel and promising strain sensing system to acquire whole field strain information with high accuracy without the need for numerical differentiation. Compared to traditional optical diffraction strain sensors, the main advantage of MDSS is the use of micro-lens array to get whole field information. Both tilt and in-plane strain can be acquired separately by using two symmetric incident laser beams. However, it is costly and troublesome to fabricate, adjust or replace lens arrays for different applications. A practical way to solve this problem is to use a liquid crystal lens as spatial light modulator which displays Diffractive Optical Element (DOE) based lens array. This liquid crystal lens is software controlled capable to display any user designed DOE pattern. The sensitivity and field of interrogation is thus tuneable by changing focal length of lens arrays. Moreover arbitrary size or shape of lens arrays can be designed to measure certain part of the specimen in most interest. Experimental results with different lens arrays are demonstrated for uniform rotations.

Citation Download Citation

Hui Zhu and Anand Asundi "Tunable-microlens-based multipoint diffraction strain sensor", Proc. SPIE 7522, Fourth International Conference on Experimental Mechanics, 75220M (14 April 2010); https://doi.org/10.1117/12.851663

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