| Microwave Nondestructive Evaluation of Disbonds Under Anechoic Tiles |
JUL 96 |
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| Authors:
R. J. Ditchburn; A. Amiet; S. K. Burke; DEFENCE SCIENCE AND TECHNOLOGY ORGANIZATION CANBERRA (AUSTRALIA)
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 | An experimental and theoretical study of a microwave nondestructive inspection technique to detect the presence of and evaluate the thickness of disbonds between anechoic tiles and the hull of the COLLINS class submarine is presented. The magnitude and phase of a reflected microwave signal in the absence and presence of a disbond is measured as a function of disbond thickness and frequency for (i) a layer of anechoic tile material ... |
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| eddy-current inspection of cracks in a multilayer conductor |
01 JAN 90 |
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| Authors:
S. K. Burke
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| the purpose of this paper is to present a model for eddy-current nondestructive inspection (ndi) of cracks in the simplest multilayer structure, that of two parallel conducting plates separated by an insulating gap. the model is based on a recent study of the interaction between induced currents and a through-crack in a plate and assumes that the cracked plate is thin. there are two distinct parts to this work: first, ... |
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| EDDY CURRENT DETECTION OF SHORT CRACKS IN SHEETS |
89 |
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| Authors:
S. K. Burke; L. R. F. Rose
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| eddy-current ndi of through-thickness cracks in plates is characterized by a number of competing length scales. in the case of a thin plate, i.e. plate thickness h << skin-depth delta, there are three important length parameters: the crack length 2c, the average coil radius r(-) (or some other measure of probe size) and the intrinsic length scale for induction in thin plates, b-1 = delta2/h. in this paper we consider ... |
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| A BENCHMARK PROBLEM FOR COMPUTATION OF DELTA Z IN EDDY-CURRENT NONDESTRUCTIVE EVALUATION (NDE) |
JUN 88 |
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| Authors:
S. K. Burke
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| experimental results are presented for the change in coil impedance of delta z when a circular air-cored coil carrying an alternating current of fixed frequency is scanned across a rectangular slot in an aluminum alloy plate. it is proposed that these measurements be used as a benchmark test to verify theoretical calculations of probe response in eddy-current nde. (author). |
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| EDDY CURRENT INDUCTION BY A COIL NEAR A CONDUCTING EDGE IN 2D |
AUG 86 |
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| Authors:
S. K. Burke
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| the induction of eddy currents in a conducting 90 degree edge by a two-dimensional coil is considered in this paper. first, the impedance of a two- dimensional coil in the vicinity of a conducting quarter-space is calculated numerically using a dual boundary-integral-equation (bie) method and the results compared with experiment. the behaviour of the induced currents (vector potential) in the vicinity of the edge is then examined using the numerical ... |
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