Determination of curvature and twist of deformed object by digital holographic interferometry

C. Quan; W. Chen; C. J. Tay

doi:10.1117/12.839256

25 August 2009 Determination of curvature and twist of deformed object by digital holographic interferometry

C. Quan, W. Chen, C. J. Tay

Proceedings Volume 7375, ICEM 2008: International Conference on Experimental Mechanics 2008; 73753H (2009) https://doi.org/10.1117/12.839256
Event: International Conference on Experimental Mechanics 2008 and Seventh Asian Conference on Experimental Mechanics, 2008, Nanjing, China

Abstract

This paper describes a feasibility study of digital holographic interferometry for the measurement of curvature and twist of a deformed object. Measurement of curvature and twist is an important aspect in experimental mechanics. Numerous methods have been proposed to determine the curvature and twist by using digital shearography. We proposed a novel method to determine curvature and twist based on digital holography (DH) and complex phasor (CP). In the conventional methods, phase difference between the first and second states is obtained directly by digital phase subtraction (DPS) and Fourier transform is then employed to extract phase maps. In this study, CP method is proposed to improve the quality of phase maps corresponding to second-order derivatives. Subsequently, sine/cosine transformation and short time Fourier transform (STFT) are employed to process the wrapped phase maps. An experiment is conducted on a clamped circular plate under a point load at centre. The experimental results show that the proposed method is valid and able to obtain high quality phase maps corresponding to curvature and twist of a deformed object.

Citation Download Citation

C. Quan, W. Chen, and C. J. Tay "Determination of curvature and twist of deformed object by digital holographic interferometry", Proc. SPIE 7375, ICEM 2008: International Conference on Experimental Mechanics 2008, 73753H (25 August 2009); https://doi.org/10.1117/12.839256

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