Method and apparatus for making spatially correlated eddy curren

Details Method and apparatus for making spatially correlated eddy curren Method and apparatus for making spatially correlated eddy curren

1990-03-05

1992-12-29

Snow, Walter E.

Electricity: measuring and testing

Magnetic

With compensation for test variable

324238, G01N 2772, G01R 3312

Patent

active

051754983

ABSTRACT:
Apparatus for measuring flaws in an object, such as a tube, having both an erratic motion, e.g. a back and forth oscillation, and a net axial motion has an idler wheel engaging the tube, and a digital rotary shaft encoder attached to the wheel. A POP circuit is coupled to the encoder. A pair of coils disposed around the object make up the active elements in an eddy current bridge. An ADC is coupled to both the bridge and POP circuit and corrects the signal from the bridge for motion complications. A method for doing same comprises sensing only the net motion of the object, detecting flaws in the object, providing an erratic motion complicated flaw signal, and correcting the flaw signal for the erratic motion.

REFERENCES:
patent: 2882488 (1959-04-01), Price et al.
patent: 3328681 (1967-06-01), Wood
patent: 4909091 (1990-04-01), Ellmann et al.

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