SEDL / STP / STP223-EB / STP41993S



Reduction of Probe-Spacing Effect in Pulsed Eddy Current Testing

Waidelich, Donald L.
Argonne National Laboratory, Lemont,Ill.


Pages: 10    Published: Jan 1958


Download this paper for $25 PDF (248K)          View License Agreement
        Click here to download the complete source publication for $109 PDF (13M)


Source: STP223-EB


Abstract

In using pulsed eddy currents to determine the thickness of cladding, it was found that the output wave as observed on the screen of a cathode-ray oscilloscope had several unusual points. These points were stationary as the probe-to-metal spacing varied, but moved vertically as the cladding thickness changed. Tests on a clad plate seemed to indicate that the points could be used to determine cladding thickness with little interference from changes in the probe-to-metal spacing. One such method involves the use of small photocells placed in front of the oscilloscope screen with the output of the photocells connected to a recorder. The initial tests with such a system are presented in this paper.


Paper ID: STP41993S
Committee/Subcommittee: E07.07
DOI: 10.1520/STP41993S
CrossRef ASTM International is a member of CrossRef.