Electricity: measuring and testing – Magnetic – With means to create magnetic field to test material
Patent
1989-11-06
1991-04-09
Snow, Walter E.
Electricity: measuring and testing
Magnetic
With means to create magnetic field to test material
324237, 324238, G01R 3312, G01N 2782
Patent
active
050068008
ABSTRACT:
A phase-difference eddy current imaging system has a bridge circuit including a pair of coils with one or both coils disposed proximate an object that may contain one or more flaws. An oscillator is coupled to the bridge circuit and also to a pair of phase detectors that are coupled to the coils. A differential amplifier is coupled to the phase detectors for providing a comparison signal. A method for eddy current imaging using phase difference detection comprises providing relative movement between an object and at least one of a pair of coils, measuring the phase of the effective reactance in each of the coils, comparing the measured values, and formatting the compared values as a function of spatial position.
REFERENCES:
patent: 4594549 (1986-06-01), Smith et al.
patent: 4823082 (1989-07-01), Nasu et al.
K. H. Hendengren et al., "Use of Imaging Techniques For Eddy Current NDE", From Review of Progress in Quantitative Nondestructive Evaluation, vol. 7A, Plenum Pub. Corp., May 1988, pp. 357-365.
Hedengren Kristina H. V.
Hurley Donna C.
Young John D.
Davis Jr. James C.
General Electric Company
Glaubensklee Marilyn
Snow Walter E.
Webb II Paul R.
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