Electricity: measuring and testing – Magnetic – Plural tests
Patent
1982-09-13
1984-10-02
Strecker, Gerard R.
Electricity: measuring and testing
Magnetic
Plural tests
324233, 324239, G01N 2772, G01R 3312
Patent
active
044750838
ABSTRACT:
Parameters of electrically conductive material at high temperature are measured by generating, by means of a transmitter coil, an electromagnetic alternating field which induces currents in the material and by detecting, by means of a receiver coil, a specific component of the secondary electromagnetic alternating field generated by the induced currents and dependent on the measured parameter, the frequency of the generated electromagnetic alternating field being such that the penetration depth of the field into the material is of the same geometrical order of magnitude as the characteristic geometrical dimension of the system, such as the distance between the receiver coil and the material. The specific component of the secondary electromagnetic alternating field is detected by means of a synchronous detector connected to the receiver coil and controlled by a phase-shifted signal from the transmitter.
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Snow Walter E.
Strecker Gerard R.
Studsvik Energiteknik AB
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