Electricity: measuring and testing – Magnetic – With means to create magnetic field to test material
Patent
1978-12-26
1981-09-15
Strecker, Gerard R.
Electricity: measuring and testing
Magnetic
With means to create magnetic field to test material
324234, 331 65, 331 96, 331107DP, 331117D, G01N 2782, G01R 3312, G01N 2202
Patent
active
042900174
ABSTRACT:
An apparatus for characterizing a surface anomaly in an electrically conductive sample includes an oscillator with an amplifier for supplying gain to the oscillator, a feedback loop linking the input and output of the amplifier, a two port ferromagnetic resonator connected within the loop to modulate the level and frequency of oscillation of the oscillator in response to eddy currents induced in the surface of the sample by the resonator, a variable attenuator connected within the loop to adjust the power level of the oscillator, and an adjustable phase shifter connected within the loop for changing the total phase shift of the loop. A sensing circuit is operably connected to the output of the amplifier to monitor the resonance parameters of the oscillator.
REFERENCES:
patent: 2415789 (1947-02-01), Farrow
patent: 3495166 (1970-02-01), Lorenzi et al.
patent: 3909746 (1975-09-01), Abraham et al.
patent: 3931571 (1976-01-01), Hacking et al.
Auld et al, "Methods for the Detection and Characterization of Surface in Materials", pp. 267-270, Special Report APRA/AFML Contract F33615-74-65180, 7/1/76-6/30/77.
B. Auld "Theory of Ferromagnetic Resonance Probes for Surface Cracks in Metals", G. L. Report No. 2839 Jul. 1978, Stanford Univ., Stanford Calif.
Deinken John J.
Hamann H. Fredrick
Malin Craig O.
Rockwell International Corporation
Snow Walter E.
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