Temporal wavelet analysis for deformation and velocity measurement in speckle interferometry

Yu Fu; Cho Jui Tay; Chenggen Quan; L. J. Chen

doi:10.1117/1.1801472

1 November 2004 Temporal wavelet analysis for deformation and velocity measurement in speckle interferometry

Yu Fu, Cho Jui Tay, Chenggen Quan, L. J. Chen

Author Affiliations +

Optical Engineering, Vol. 43, Issue 11, (November 2004). https://doi.org/10.1117/1.1801472

Abstract

When a continuously deforming object is measured by electronic speckle pattern interferometry (ESPI), the speckle pattern recorded on a camera sensor changes constantly. These time-dependent speckle patterns would provide the deformation history of the object. Various objects are applied with both linearly and nonlinearly varying loads and speckle patterns are captured using a high-speed CCD camera. The temporal intensity variation of each pixel on the recorded images is analyzed by a robust mathematical tool—Morlet wavelet transform instead of conventional Fourier transform. The transient velocity and displacement of each point can be retrieved without the necessity of the temporal or spatial phase unwrapping process. The displacements obtained are compared with those from a temporal Fourier transform, and the results show that the wavelet transform minimizes the influence of noise and provides better results for a linearly varying load. System error in the wavelet analysis for nonlinear load is also discussed.

©(2004) Society of Photo-Optical Instrumentation Engineers (SPIE)

Citation Download Citation

Yu Fu, Cho Jui Tay, Chenggen Quan, and L. J. Chen "Temporal wavelet analysis for deformation and velocity measurement in speckle interferometry," Optical Engineering 43(11), (1 November 2004). https://doi.org/10.1117/1.1801472

Published: 1 November 2004

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available