Eddy current probe having body of high permeability supporting d

Details Eddy current probe having body of high permeability supporting d Eddy current probe having body of high permeability supporting d

1993-09-24

1995-03-21

Strecker, Gerard R.

Electricity: measuring and testing

Magnetic

With means to create magnetic field to test material

324232, 324235, 324262, G01N 2790

Patent

active

053999681

ABSTRACT:
An eddy current probe for detection of cracks in multi-layered structures. The probe includes a body of a material having high permeability and is shaped to include a central core and an additional wall. A central core drive coil is wound around the central core of the body and a plurality of sense coils are located in an array in association with the additional wall. An outer drive coil is wound about the outside of the additional wall. The central core drive coil is excited with a first alternating current high frequency signal producing eddy currents primarily in the top of the layered structure. These eddy currents are sensed with the sense coil array and analyzed for structural defects in the top surface of the layered structure. The central core coil is excited with a second alternating current signal of a lower frequency than the first signal producing eddy currents in deeper layers of the structure. Such eddy currents are sensed by the sense coils and the signals so sensed are stored. The outer drive coil is excited with a low frequency signal and the sense coils operated to detect eddy currents in deeper layers of the structure. The signal from excitation of the outer drive coil is scaled with respect to the signal from the central core drive coil for separating signal indicative of defects from that indicative of differences in the structure of the underlying components of the layered structure. The probe may be circular or linear.

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U.S. Department of Commerce, National Bureau of Standards, Washington, D.C. 20234.

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