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dc.contributor.authorWaidelich, Donald L.eng
dc.date.issued1955eng
dc.description"July 1,1955."eng
dc.description"Reprinted from the Proceedings of the NATIONAL ELECTRONICS CONFERENCE, Vol. 10, February 1955."eng
dc.description.abstract"The nondestructive measurement of the thickness of one metal coated or clad upon another metal as a base has been studied for the past twenty years or more. If one of the metals is magnetic, the problem is relatively simple. If the clad and base metals are both nonmagnetic, the measurement problem is more difficult, particularly if both metals have nearly equal electrical conductivities. The phase measurement of sinusoidal eddy currents has been tried with some success although there is difficulty with low sensitivity and the presence of harmonic frequencies. The use of pulsed eddy currents in the manner of echo sounding appeared to have promise and was tried. A brief theoretical treatment indicated that the necessary pulse length depended upon the thickness of the coating. For thickness of the order of ten mils of coating, pulse lengths of approximately one microsecond were found satisfactory. A thyratron was used to pulse the magnetic probe, while a balancing circuit was employed almost to eliminate the echo from the air-to-metal surface so the echo from the metal-to-metal boundary could be detected. Several different forms of the balancing circuit were tested. Comparison of thicknesses measured using the pulsed probe is made with those measured optically."--Page 1.eng
dc.format.extent8 pages ; illustrationseng
dc.identifier.urihttps://hdl.handle.net/10355/63284
dc.languageEnglisheng
dc.publisherUniversity of Missourieng
dc.relation.ispartofcollectionUniversity of Missouri-Columbia. University of Missouri general publications. University of Missouri bulletin. Engineering reprint serieseng
dc.relation.ispartofseriesUniversity of Missouri bulletin ; volume 56, number 24eng
dc.relation.ispartofseriesUniversity of Missouri bulletin. Engineering reprint series ; no. 16eng
dc.subject.FASTEddy currents (Electric)eng
dc.subject.FASTMetal coating -- Measurementeng
dc.titleCoating thickness measurements using pulsed eddy currentseng
dc.typeBookeng


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