Location

Williamsburg, VA

Start Date

1-1-1986 12:00 AM

Description

The a.c. field measurement technique makes use of the skin effect in which on a.c. field applied to a metal is confined to a thin layer at the surface. The surface electric field is then investigated using a voltage-difference probe. A change in the voltage gradient along the surface is interpreted as being due to a change in the path length along a field line between the probe contacts, thus indicating the presence of a crack. The technique has been described previously [1,2], and the development of this work to cover line contacts and sub-surface flaws is described elsewhere in these proceedings [3].

Book Title

Review of Progress in Quantitative Nondestructive Evaluation

Volume

5A

Chapter

Chapter 1: Conventional Methodologies

Section

Eddy Currents

Pages

207-214

DOI

10.1007/978-1-4615-7763-8_22

Language

en

File Format

application/pdf

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Jan 1st, 12:00 AM

An Assessment of Factors that Influence the Skin Depth in A.C.F.M. Crack Sizing

Williamsburg, VA

The a.c. field measurement technique makes use of the skin effect in which on a.c. field applied to a metal is confined to a thin layer at the surface. The surface electric field is then investigated using a voltage-difference probe. A change in the voltage gradient along the surface is interpreted as being due to a change in the path length along a field line between the probe contacts, thus indicating the presence of a crack. The technique has been described previously [1,2], and the development of this work to cover line contacts and sub-surface flaws is described elsewhere in these proceedings [3].