Eddy current test probe with circumferential Segments and method

Details Eddy current test probe with circumferential Segments and method Eddy current test probe with circumferential Segments and method

1982-04-08

1985-01-22

Strecker, Gerard R.

Electricity: measuring and testing

Magnetic

With means to create magnetic field to test material

324207, G01N 2790, G01R 3312

Patent

active

044954662

ABSTRACT:
An instrument having a multi-segmented cup core of a high permeability material with a center post. The outer wall of the cup contains equidistant holes and slots through which a plurality of individual windings are constructed to form a circular array of pick-up coils. A primary winding or search coil is constructed around the center post. Excitation of the search coil induces eddy currents in adjacent multi-layered bolt hole regions which in turn produce a voltage in each of the pick-up coils. As a crack in the material under test will cause an abnormal distribution of eddy currents, a comparison of the voltage measurements of the specimen under test with those of a reference sample will detect the presence of a crack and its corresponding orientation.

REFERENCES:
patent: 1893074 (1933-01-01), Drake
patent: 2467306 (1949-04-01), Habig
patent: 3109139 (1963-10-01), Branker
patent: 3166710 (1965-01-01), Schmidt
patent: 3193784 (1965-07-01), Lautzenhiser
patent: 3197693 (1965-07-01), Libby
patent: 3359495 (1967-12-01), McMaster et al.
patent: 3449664 (1969-06-01), Smith
patent: 3535625 (1970-10-01), Pratt
patent: 4095181 (1978-06-01), Harris et al.
patent: 4204159 (1980-05-01), Sarian et al.
"Improved Low Frequency Eddy Current Inspection for Cracks Under Installed Fasteners", Tech. Report AFWAL-TR-80-4150; Available from NTIS.

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