Dielectric change sensing device

Details Dielectric change sensing device Dielectric change sensing device

1975-06-10

1976-12-07

Myracle, Jerry W.

Measuring and testing

Liquid level or depth gauge

Immersible electrode type

324 61R, G01F 2300

Patent

active

039954889

ABSTRACT:
A sensing head for use in the sensing of impedance changes includes a bridge circuit, a first diode and first resistor connected in series and a second diode and a second resistor connected in series. The first and second diodes are connected to a first junction which is adapted to be connected to a high frequency alternating voltage supply such that, in use, the diodes will pass electrical signals of opposite sign from the junction. The first and second resistors are connected to a second junction which is adapted to be connected in use to an output circuit. There are also provided a first capacitor, a plate of which is connected to a junction which is between the first diode and the first resistor, and a second capacitor, a plate of which is connected to a junction which is between the second diode and the second resistor. When in use, a change in the dielectric properties in a body adjacent to the first capacitor produces a change in the output signal across the output circuit. The bridge circuit is rigidly mounted within a conducting screen having an aperture adjacent to the first capacitor.

REFERENCES:
patent: 2882728 (1959-04-01), Zito

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