Continuous condition sensing system

Details Continuous condition sensing system Continuous condition sensing system

1986-10-14

1988-11-29

Eisenzopf, Reinhard J.

Electricity: measuring and testing

Conductor identification or location

Inaccessible

73304C, 324 61P, G01R 2726

Patent

active

047884886

ABSTRACT:
A probe developing an admittance with a material whose condition is to be continuously measured is capacitively coupled with a variable frequency oscillator, preferably one having a digital output stage, for generating a variable frequency signal having a period varying with the admittance developed at the probe. Both the oscillator input and output are capacitively coupled to the probe. In a preferred embodiment, a set point circuit including a plurality of resistors coupled in parallel with the oscillator output and a plurality of switches coupled in parallel with the probe conductor and each with a different one of the resistor, provides easy circuit adjustment for use of the system with a variety of materials. A preferred digital circuit employing a pair of flip flops, fixed timer and one shot generate a fixed period variable duration duty cycle digital voltage level signal for transmission, if desired, or for conversion into a variable current signal.

REFERENCES:
patent: 2866336 (1958-12-01), Hitchcox
patent: 4589281 (1986-05-01), Aldrich
patent: 4642555 (1987-02-01), Swartz et al.
patent: 4674329 (1987-06-01), Mulder

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