Electricity: measuring and testing – Conductor identification or location – Inaccessible
Patent
1981-09-03
1983-12-27
Krawczewicz, Stanley T.
Electricity: measuring and testing
Conductor identification or location
Inaccessible
324 65R, 357 23, G01R 2702
Patent
active
044233710
ABSTRACT:
An impedance measuring apparatus having a measuring transistor with its gate electrode adapted to form a two electrode, interdigitated capacitor with the material to be measured forming the dielectric, a second reference transistor connected in differential configuration to the measuring transistor so that their drain currents are constrained to be equal, a time-varying voltage generator connected to one electrode of the interdigitated capacitor and a gain-phase meter connected to the gate of the reference transistor.
REFERENCES:
patent: 3882381 (1975-05-01), Gregory
patent: 4158807 (1979-06-01), Senturia
patent: 4316140 (1982-02-01), Senturia
Garverick et al.: "An MOS Device . . . Moisture Monitoring"--IEEE Tran. Electron Devices-Jan. 1982, pp. 90-94.
Garverick Steven L.
Senturia Stephen D.
Engellenner Thomas J.
Krawczewicz Stanley T.
Massachusetts Institute of Technology
Smith, Jr. Arthur A.
Solis Jose M.
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