Please use this identifier to cite or link to this item: https://doi.org/10.1117/1.3359470
Title: Direct measurement of curvature and twist using two-channel double-aperture digital shearography
Authors: Bhaduri, B. 
Tay, C.J. 
Quan, C. 
Keywords: curvature
digital shearography
fast Fourier transform
filtering
speckle
twist
Issue Date: 2010
Source: Bhaduri, B.,Tay, C.J.,Quan, C. (2010). Direct measurement of curvature and twist using two-channel double-aperture digital shearography. Optical Engineering 49 (3) : -. ScholarBank@NUS Repository. https://doi.org/10.1117/1.3359470
Abstract: A direct method of determining second-order derivatives of displacement (curvature and twist) using two-channel double-aperture digital shearography is presented. Spatial carrier fringes are incorporated inside the speckle using a double-aperture mask in a two-channel experimental setup. Two sets of slope phase maps are generated that are either shifted in the x direction for curvature measurement or in the y direction for twist measurement. Experimental results are presented to verify the validity of the proposed method. © 2010 Society of Photo-Optical Instrumentation Engineers.
Source Title: Optical Engineering
URI: http://scholarbank.nus.edu.sg/handle/10635/59961
ISSN: 00913286
DOI: 10.1117/1.3359470
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