Measurement of the defect size by shearography or other interferometric techniques

Fabrice R. Michel; Yvon L. Renotte; Serge Habraken

doi:10.1117/1.OE.51.3.033602

6 April 2012 Measurement of the defect size by shearography or other interferometric techniques

Fabrice R. Michel, Yvon L. Renotte, Serge Habraken

Author Affiliations +

Optical Engineering, Vol. 51, Issue 3, 033602 (April 2012). https://doi.org/10.1117/1.OE.51.3.033602

Abstract

Shearography is an interferometric technique suitable for detecting defects because they yield singular fringes and high phase values in wrapped and unwrapped phasemaps, respectively. We propose a methodology that leads to the defect size from unwrapped phasemap by extracting the size of the high phase values area. The area size is evaluated, thanks to a wavelet transform algorithm that enables the location of its borders. The performances of the methodology and of the algorithm have been tested by applying them on a defect where the size is known. An error less than 1.5% root mean square was reached. Our approach is independent of the shearing amount and of the phase profile, and it can be extended for other interferometric techniques.

Citation Download Citation

Fabrice R. Michel, Yvon L. Renotte, and Serge Habraken "Measurement of the defect size by shearography or other interferometric techniques," Optical Engineering 51(3), 033602 (6 April 2012). https://doi.org/10.1117/1.OE.51.3.033602

Published: 6 April 2012

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