Frequency dependent identification of materials

Details Frequency dependent identification of materials Frequency dependent identification of materials

1988-09-26

1989-11-14

Eisenzopf, Reinhard J.

Electricity: measuring and testing

Conductor identification or location

Inaccessible

324 57R, 324 61P, G01R 2726

Patent

active

048810258

ABSTRACT:
Packaged materials are tested in a capacitive sensor which has plates whose spacing can be accurately adjusted, and whose plates are segmented so that selected segments can be employed. An a.c. voltage is applied across the capacitive plates at accurately known amplitude, phase, and frequency for a number of frequencies. A ratio bridge is tied to each number of frequencies. A ratio bridge is tied to each of the segments and provides outputs that reflect the a.c. voltage and current, both capacitive and ohmic. A zero-crossing detection method or time domain method can be employed to provide precise amplitude and phase, or a quadrature or phase-sensitive detection method can provide amplitude and phase, or a quadrature or phase-sensitive detection method can provide amplitude and phase of the a.c. current through each segment. Values of capacitance, conductance, frequency dependence of capacitance, and frequency dependent of conductance are compared to stored values of a number of known objects of the target class.

REFERENCES:
patent: 3311823 (1967-03-01), Benson, Jr.
patent: 3354388 (1967-11-01), Perry
patent: 3815021 (1974-06-01), Kerr
patent: 4174498 (1979-11-01), Preikschat
patent: 4288741 (1981-09-01), Dechene et al.
patent: 4291708 (1981-09-01), Frei et al.

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