title: Measurement of curvature and twist of a deformed object using digital holography.
abstract: Measurement of curvature and twist is an important aspect in the study of object deformation. In recent years, several methods have been proposed to determine curvature and twist of a deformed object using digital shearography. Here we propose a novel method to determine the curvature and twist of a deformed object using digital holography and a complex phasor. A sine/cosine transformation method and two-dimensional short time Fourier transform are proposed subsequently to process the wrapped phase maps. It is shown that high-quality phase maps corresponding to curvature and twist can be obtained. An experiment is conducted to demonstrate the validity of the proposed method.
authors.affiliation: Department of Mechanical Engineering, National University of Singapore, Singapore.
authors.forename: Wen
authors.initials: W
authors.lastname: Chen
authors.forename: Chenggen
authors.initials: C
authors.lastname: Quan
authors.forename: Cho
authors.initials: C
authors.lastname: Jui Tay