Admittance measuring system for monitoring the condition of mate

Details Admittance measuring system for monitoring the condition of mate Admittance measuring system for monitoring the condition of mate

1974-09-19

1976-11-23

Chatmon, Jr., Saxfield

Electricity: measuring and testing

Conductor identification or location

Inaccessible

324 57R, 324 58R, 324 585R, 324 58A, G01R 1152, G01R 2726

Patent

active

039939472

ABSTRACT:
An intrinsically safe system for monitoring the condition of materials includes a low power, stable frequency RF oscillator of the class C type comprising a resonant circuit which is coupled to a bridge network including the admittance of materials between a probe electrode and a grounded support member juxtaposed to the materials. The output of the network generates an AC error signal which is applied to a phase sensitive detector including a chopper and a low power chopper drive for generating a DC signal representing the magnitude of the AC signal at a predetermined phase angle. The bridge network which may be linearly calibrated is isolated from the oscillator and the output error signal circuitry so as to allow the oscillator and the output error signal circuitry to float with respect to the grounded support member and the power supply associated therewith. The rms voltage across the admittance representing the condition of materials is limited so as to permit the system to comprise a two-wire transmitter wherein the sole source of power for the transmitter is derived from a 4-20 milliamp current drawn by the transmitter.

REFERENCES:
patent: 3571703 (1971-03-01), Russel
patent: 3624541 (1971-11-01), Lundstrom
patent: 3646434 (1972-02-01), Norwich
patent: 3648165 (1972-03-01), Shawhan
patent: 3706980 (1972-12-01), Maltby
patent: 3746975 (1973-07-01), Maltby
patent: 3778705 (1973-12-01), Maltby

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