Eddy current test apparatus for annular welds

Details Eddy current test apparatus for annular welds Eddy current test apparatus for annular welds

1979-03-12

1982-06-29

Strecker, Gerard R.

Electricity: measuring and testing

Magnetic

Magnetic sensor within material

324238, G01N 2772, G01N 2782

Patent

active

043374310

ABSTRACT:
Non destructive test apparatus for the inspection of annular welds, such as the tube/tube sheet welds of a tube-in-shell heat exchanger, using eddy current techniques. The apparatus comprises a rotatable probe assembly having a pair of sensors for interrogating the weld, bridge means for comparing the signals produced by the sensors and electronic circuitry arranged to combine the differential of the signals with a simple voltage locus signal derived from a sine/cosine potentiometer associated with the probe assembly drive and to feed the combination signal to an oscilloscope.

REFERENCES:
patent: 3419797 (1968-12-01), Libby
patent: 3875502 (1975-04-01), Neumaier
patent: 4134067 (1979-01-01), Woodbury

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