Eddy current flaw detector using a pair of parallel resonant cir

Details Eddy current flaw detector using a pair of parallel resonant cir Eddy current flaw detector using a pair of parallel resonant cir

1975-11-14

1977-09-20

Corcoran, Robert J.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

G01R 3312

Patent

active

040500110

ABSTRACT:
When a negative resistance is connected in parallel to a parallel resonance circuit composed of coil and condenser for detecting flaws and other defects of a travelling metal material, the detecting system is capable of improving sensitivity for detecting said flaws and lowering the required degree of amplification of the following amplifier, consequently reducing influence depending upon unbalance of a bridge circuit. At the same time, the simplifying of the power source of said system may be easily realized.

REFERENCES:
patent: 3252084 (1966-05-01), Krobath
patent: 3302105 (1967-01-01), Libby et al.
patent: 3461400 (1969-08-01), Koda

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