#### Location

La Jolla, CA

#### Start Date

1-1-1983 12:00 AM

#### Description

Calculations of the change in probe impedance produced by a flaw in or beneath the surface of a conducting material are necessary for the analysis of eddy-current flaw-detection systems. However, probe sensititivy alone does not completely determine the flaw-detection capability of such a system; the effect of noise and clutter in the system must also be considered. The objective of this work is to develop a statistical detection model for an eddy-current system, and to use this model to calculate probability of detection as a function of probability of false rejection (false alarm) for the purpose of determining the optimality of a particular system. The target flaw chosen for these calculations is a 0.015-in.-long, 0.007-in.-deep surface crack in a bolt hold in a turbine disk made of material such as IN-100, which has a conductivity of about 106 mho/m.

#### Book Title

Review of Progress in Quantitative Nondestructive Evaluation

#### Volume

2A

#### Chapter

Section 4: Probablity of Detectionâ€”Eddy Currents

#### Pages

225-244

#### DOI

10.1007/978-1-4613-3706-5_13

#### Copyright Owner

Springer-Verlag US

#### Copyright Date

January 1983

#### Language

en

#### File Format

application/pdf

Analysis and Design of Eddy-Current Measurement Systems

La Jolla, CA

Calculations of the change in probe impedance produced by a flaw in or beneath the surface of a conducting material are necessary for the analysis of eddy-current flaw-detection systems. However, probe sensititivy alone does not completely determine the flaw-detection capability of such a system; the effect of noise and clutter in the system must also be considered. The objective of this work is to develop a statistical detection model for an eddy-current system, and to use this model to calculate probability of detection as a function of probability of false rejection (false alarm) for the purpose of determining the optimality of a particular system. The target flaw chosen for these calculations is a 0.015-in.-long, 0.007-in.-deep surface crack in a bolt hold in a turbine disk made of material such as IN-100, which has a conductivity of about 106 mho/m.