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15. Eddy-current measurements of thickness of high-temperature coatings

Author

Dodd, C. V, Mcilwain, M. C, and Deeds, W. E

Subjects
Instrumentation And Photography
Abstract

The eddy-current technique was applied to measuring the thickness of a fused silicide coating on a refractory alloy slab. Phase and magnitude of the test signal were measured at four places in 13 different samples, and thickness of coating was computed on the basis of each of these quantities. These results were then compared with those obtained by conventional metallographic methods. Phase-based measurements were most reliable, and the maximum error between the metallographically determined thickness and the thickness as determined by the least squares fit to the phase measurements was less than 0.01 mm (about 1%). Photomicrography of a typical sample shows that a large source of error resides in the fact that two regions - an outer rough region and an inner uniform region - of the coating layer exist rather than the single region upon which the calculations were based.

Published
1973

32. Design and construction of eddy-current coolant-channel spacing probes

Author

Dodd, C. V. and Dodd, C. V.

Abstract

We have determined this item to be in the public domain according to US copyright law through information in the bibliographic record and/or US copyright renewal records. The digital version is available for all educational uses worldwide. Please contact HathiTrust staff at hathitrust-help@umich.edu with any questions about this item., Geometry--Ability testing., (OCoLC)464646510., Sdr-gwlaocn464646510., Http://hdl.handle.net/2027/mdp.39015077315474.

Published
1964

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