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Proceedings Paper

Numerical study of crack detection based on microwave-induced heating and thermography
Author(s): Qiong Z. Jackson; Thomas H. Jackson; Aydin Ungan; Ramana M. Pidaparti; Razi Nalim
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Paper Abstract

This paper reports on a new methodology for detecting surface cracks in metallic structures by combining a microwave resonant cavity with infrared imaging. The underlying principle is based on crack induced disruptions of microwave wall currents creating localized concentrations of microwave energy. These regions of concentrated energy may, in turn, produce a localized heating in a thin layer of dielectric material placed adjacent to the surface being inspected. Detection of local hot spots via infrared imaging may then be used to infer the presence of a crack or other discontinuity in the surface. This study utilized a numerical simulation of electromagnetic fields within the resonant cavity and the resulting dielectric heating. The objective of the numerical study was to gain insight into fundamental electromagnetic and thermophysical processes on which this NDT scheme was based. The transient 3D Maxwell's equations were solved numerically using the method of Finite Difference-Time Domain to determine electromagnetic field distributions. The energy equation was then solved in order to determine thermal energy deposition and temperature fields in the dielectric layer. The sample numerical simulations indicate that combining microwave heating with thermographic imaging could lead to a viable non- destructive testing instrument for crack detection.

Paper Details

Date Published: 24 July 2001
PDF: 7 pages
Proc. SPIE 4335, Advanced Nondestructive Evaluation for Structural and Biological Health Monitoring, (24 July 2001); doi: 10.1117/12.434194
Show Author Affiliations
Qiong Z. Jackson, Indy Aero Craft Inc. (United States)
Thomas H. Jackson, Indy Aero Craft Inc. (United States)
Aydin Ungan, Indiana Univ.-Purdue Univ./Indianapolis (United States)
Ramana M. Pidaparti, Indiana Univ.-Purdue Univ./Indianapolis (United States)
Razi Nalim, Indiana Univ.-Purdue Univ./Indianapolis (United States)

Published in SPIE Proceedings Vol. 4335:
Advanced Nondestructive Evaluation for Structural and Biological Health Monitoring
Tribikram Kundu, Editor(s)

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