Friday, 23 September 2011

SIGNAL MODELING IN THE FAR-INFRARED REGION FOR NONDESTRUCTIVE EVALUATION APPLICATIONS



AIP Conf. Proc. -- June 23, 2011 -- Volume 1335, pp. 581-588
REVIEW OF PROGRESS IN QUANTITATIVE NONDESTRUCTIVE EVALUATION: Volume 30A; Volume 30B; doi:10.1063/1.3591903

Issue Date: 23 June 2011
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ABSTRACT
Chien-Ping Chiou, David K. Hsu, Dan Barnard, Kwang-Hee Im, and R. Bruce Thompson
Center for Nondestructive Evaluation, Iowa State University, Ames, Iowa 50011
Terahertz radiation (a.k.a. T-ray) has emerged as a powerful inspection technique in recent years. It extends into the lower region of far-infrared in the electromagnetic spectrum, and has been proven very effective in many NDE applications. T-ray is particularly useful insome areas where accessibility is difficult or even not possible for other conventional NDE methods. Here we report a modeling effort of T-ray signal in one such application: the detection of “hidden delamination”, a special situation that a delamination was shadowed by another. This special case was experimentally simulated by two parallel saw-cuts in glass composites. In this paper, we also explore the feasibility of combing T-ray and Fourier transform infrared spectroscopy using a unified least-squares scheme for material characterization. ©2011 American Institute of Physics
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