Location

Santa Cruz, CA

Start Date

1-1-1984 12:00 AM

Description

The objective of this task is to evaluate and characterize a new type of eddy-current probe that is based on ferrite tape-head technology. Preliminary tests were conducted last year at 100 kHz using modified, commercially available floppy-disk tape heads and subassemblies. Some customized probes also were constructed for SRI by a tape-head manufacturer. These customized probes were made of ferrite material available at the manufacturer’s facility; however, this material subsequently was found to be too lossy for the eddy-current application. Nevertheless, test results obtained using the floppy-disk tape-head probes proved to be very promising from the standpoint of sensitivity, lift-off discrimination, and the ability of this type of probe to detect cracks inside and at the edges of holes.

Book Title

Review of Progress in Quantitative Nondestructive Evaluation

Volume

3A

Chapter

Chapter 3: Eddy Currents

Section

Probes

Pages

663-674

DOI

10.1007/978-1-4684-1194-2_63

Language

en

File Format

application/pdf

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Jan 1st, 12:00 AM

Evaluation of An Eddy-Current Tape-Head Probe

Santa Cruz, CA

The objective of this task is to evaluate and characterize a new type of eddy-current probe that is based on ferrite tape-head technology. Preliminary tests were conducted last year at 100 kHz using modified, commercially available floppy-disk tape heads and subassemblies. Some customized probes also were constructed for SRI by a tape-head manufacturer. These customized probes were made of ferrite material available at the manufacturer’s facility; however, this material subsequently was found to be too lossy for the eddy-current application. Nevertheless, test results obtained using the floppy-disk tape-head probes proved to be very promising from the standpoint of sensitivity, lift-off discrimination, and the ability of this type of probe to detect cracks inside and at the edges of holes.