Novel microwave method for detection of finite surface cracks in metals

Chin-Yung Yeh; Reza Zoughi

doi:10.1117/12.186707

14 September 1994 Novel microwave method for detection of finite surface cracks in metals

Chin-Yung Yeh, Reza Zoughi

Proceedings Volume 2275, Advanced Microwave and Millimeter-Wave Detectors; (1994) https://doi.org/10.1117/12.186707
Event: SPIE's 1994 International Symposium on Optics, Imaging, and Instrumentation, 1994, San Diego, CA, United States

Abstract

An electromagnetic model for finite surface crack detection is presented. An open-ended waveguide sensor is used to scan a cracked metal surface. The crack is modelled as a large waveguide feeding a smaller one. The characteristics of the standing wave set up in the waveguide is altered when the waveguide is terminated by an imperfect short circuit load (crack surface). This is due to the generation of higher order modes as a result of the presence of the crack. Strategic probing of the standing wave properties is used to indicate the presence of a crack. A Fourier boundary matching technique is used to satisfy the boundary conditions at the waveguide aperture and the crack boundaries. The behavior of crack characteristic signals as a function of crack size and location within the sensor aperture is also studied. A finite fatigue crack is finally detected at 38 GHz to demonstrate the practical feasibility of this technique.

Citation Download Citation

Chin-Yung Yeh and Reza Zoughi "Novel microwave method for detection of finite surface cracks in metals", Proc. SPIE 2275, Advanced Microwave and Millimeter-Wave Detectors, (14 September 1994); https://doi.org/10.1117/12.186707

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