Electricity: measuring and testing – Magnetic – With means to create magnetic field to test material
Patent
1981-07-21
1985-03-05
Strecker, Gerard R.
Electricity: measuring and testing
Magnetic
With means to create magnetic field to test material
324233, 324238, G01N 2782, G01N 2790, G01R 3312
Patent
active
045033927
ABSTRACT:
A method of and apparatus for nondestructive testing of spot welds by producing in a test weld high and low frequency electromagnetic fields to induce eddy currents in the weld zone. The difference between the phase values of the resultant electromagnetic field intensities is indicative of the quality of the weld. The apparatus includes an eddy current transducer, high and low-frequency measuring channels, an indicator, and a controlled commutator for alternate connection of the eddy current transducer to the low-frequency measuring channel or to the high-frequency measuring channel. A memory unit is provided for storing the output signal of the high-frequency measuring channel, and a comparator is provided for comparing the signal stored in the memory unit with the output signal of the low-frequency measuring channel. A control unit alternately generates signals for simultaneously connecting the eddy current transducer to the high-frequency measuring channel and for storing the output signal of the high-frequency measuring channel in the memory unit, and signals for simultaneously connecting the eddy current transducer to the low-frequency measuring channel, and for comparing the signal of the low-frequency measuring channel with the signal stored in the memory unit.
REFERENCES:
patent: 2900595 (1959-08-01), Mengel et al.
patent: 3526829 (1978-09-01), Noble
patent: 4287474 (1981-09-01), Fastritsky et al.
Renken et al., "Status Report in Eddy Current Theory and Application", Argonne National Laboratory Report-ANL-5861, Nov. 1958, pp. 1-7 and 37-48.
Alexeev Gennady N.
Ardentov Vasily V.
Fastritsky Viktor S.
Florinsky Jury B.
Plotnikov Viktor I.
Edmonds Warren S.
Rizhsky Politekhnichesky Institut
Strecker Gerard R.
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