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Accession Number:
ADD014571
Title:
Eddy Current Method for Measuring Electrical Resistivity and Device for Providing Accurate Phase Detection.
Descriptive Note:
Patent, Filed 9 Jan 89, patented 1 May 90,
Corporate Author:
DEPARTMENT OF THE NAVY WASHINGTON DC
Report Date:
1990-05-01
Pagination or Media Count:
13.0
Abstract:
This invention relates to a method and devices for measuring the resistivity of materials. In particular, the methods measure resistivity in carbon fiber reinforced composites as well as any materials with a relative magnetic permeability of 1. The measurement may be made with access restricted to a single side of the material under test. The present invention relates to the field of nondestructive inspection of materials. In particular, this invention involves methods and a device of eddy current inspection for estimating the electrical resistivity of materials. While the method applies to all materials with a relative magnetic permeability of 1, it is particularly useful when the test material falls in one or more of three categories 1 the resistivity falls within a range for which there are no calibration standards 2 only one surface of the test material is accessible and 3 the resistivity is frequency dependent and must be determined over a particular range of frequencies. Keywords Patents, PAT-CL-320-236. JES
Distribution Statement:
APPROVED FOR PUBLIC RELEASE