High frequency eddy current probe with planar, spiral-like coil

Details High frequency eddy current probe with planar, spiral-like coil High frequency eddy current probe with planar, spiral-like coil

1985-11-20

1987-11-10

Strecker, Gerard R.

Electricity: measuring and testing

Magnetic

With means to create magnetic field to test material

324262, 336206, G01N 2790, G01R 3312

Patent

active

047060204

ABSTRACT:
An eddy current probe, excitable at frequencies equal to or greater 7 mhz., includes a substantially planar, spiral-like, unilaminar coil mounted on an insulative substrate. A protective layer covers the coil and is adopted to present only a minimal mechanical barrier between the coil and a region of material under test. The coil is a continuous run of copper having an effective diameter no greater than 2 mils. The coil, substrate and protective layer are a printed circuit board. A method of detecting flaws is also disclosed.

REFERENCES:
patent: 3449662 (1969-10-01), Wood
patent: 4042876 (1977-08-01), Visioli
patent: 4107605 (1978-08-01), Hudgell
patent: 4310821 (1982-01-01), Frances
Bahr et al, Novel Eddy Current Probe Development Air Force Wright Aeronautical Laboratories Report, AFWAL-TR-31-4159, Dec. 1981, Abstract and pp. 1-3 and 29.

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