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A novel microwave method for detection of long surface cracks in metals

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2 Author(s)
Chin-Yung Yeh ; Dept. of Electr. Eng., Colorado State Univ., Fort Collins, CO, USA ; Reza Zoughi

A novel microwave technique for detecting long surface cracks in metals is described. This technique utilizes an open-ended waveguide to probe the surface of a metal. In the absence of a crack the metal surface is seen as a relatively good short-circuit load. However, in the presence of a crack higher order modes are generated which in turn change the reflection properties at the waveguide aperture. This change brings about a perturbation in the standing wave characteristics which is then probed by a diode detector. The experimental and theoretical foundations of this technique are given, along with several examples. It is shown that cracks a fraction of a millimeter in width are easily detected at around 20 GHz or lower. Smaller cracks can be detected at higher microwave frequencies

Published in:

IEEE Transactions on Instrumentation and Measurement  (Volume:43 ,  Issue: 5 )