Location

La Jolla, CA

Start Date

1-1-1991 12:00 AM

Description

This paper discusses the application of a numerical analysis technique to study eddy-current transducers. Probe design and operating parameters are determined by the constraints of excitation current and the material being tested Because the depth of penetration of the induced eddy-current is related to the excitation frequency as well as the permeability and conductivity of the specimen, the operating frequency may be selected for a certain depth of resolution. However, subsurface field depth is also a function of relative probe size and lift-off. Although there are no known closed form solutions relating probe size and lift-off to penetration, approximate analytical relationships have been developed by Mottl[3].

Book Title

Review of Progress in Quantitative Nondestructive Evaluation

Volume

10B

Chapter

Chapter 7: Characterization of Materials

Section

Non-Linear Acoustic Properties

Pages

1937-1944

DOI

10.1007/978-1-4615-3742-7_104

Language

en

File Format

application/pdf

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Jan 1st, 12:00 AM

A Parametric Finite Element Study of a Generic Crack Sizing Problem

La Jolla, CA

This paper discusses the application of a numerical analysis technique to study eddy-current transducers. Probe design and operating parameters are determined by the constraints of excitation current and the material being tested Because the depth of penetration of the induced eddy-current is related to the excitation frequency as well as the permeability and conductivity of the specimen, the operating frequency may be selected for a certain depth of resolution. However, subsurface field depth is also a function of relative probe size and lift-off. Although there are no known closed form solutions relating probe size and lift-off to penetration, approximate analytical relationships have been developed by Mottl[3].