Electricity: measuring and testing – Magnetic – With means to create magnetic field to test material
Patent
1979-02-26
1980-10-28
Strecker, Gerard R.
Electricity: measuring and testing
Magnetic
With means to create magnetic field to test material
324228, 324233, G01N 2772, G01R 3312
Patent
active
042309875
ABSTRACT:
The apparatus comprises a parallel coil and a capacitance, the coil having an air gap in which an unknown specimen is inserted, a source of alternating voltage applied to the coil-capacitance combination, scanning means for automatically varying the value of the capacitance in steps, thus varying the phase of the voltage across the coil, means for digitizing the phase of the voltage corresponding to each capacitance value, a memory in which those digitized phase values are stored, a reference memory containing digitized phase values for known specimens, and means for comparing the digitized phase values of the unknown specimen with those of known specimens. A digital tolerance control circuit is also provided which accommodates deviations between the reference and the known phase values, up to predetermined amounts, and means are provided for displaying the generic name or grade of the stored phase values which match the phase values of the unknown specimen.
REFERENCES:
patent: 3229198 (1966-01-01), Libby
patent: 3314006 (1967-04-01), Hentschel
patent: 4059795 (1977-11-01), Mordwinkin
patent: 4086527 (1977-04-01), Cadot
Sensor Corporation
Snow Walter E.
Strecker Gerard R.
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