Apparatus for on-line determination of dielectric constant

Details Apparatus for on-line determination of dielectric constant Apparatus for on-line determination of dielectric constant

1986-04-11

1988-04-05

Pellinen, A. D.

Electricity: measuring and testing

Conductor identification or location

Inaccessible

324 61P, 324 61QS, G01N 2702, G01R 2726

Patent

active

047361565

ABSTRACT:
An improved apparatus for the "on-line" measurement of the dielectric constant or percent moisture of a material such as tobacco moving within the walls of a pipe or chute is disclosed. A differential capacitive technique is used for the measurement. The apparatus consists of a four electrode device, with two of the electrodes attached to the outside of the walls of the pipe or chute, and two of the electrodes attached to the inside of the walls of the pipe or chute. The two inner electrodes are connected by switches to the two outer electrodes, respectively, so that first and second capacitances appear at the output terminals of the electrode device depending upon the position of the switches. The output terminals of the electrode device are connected to an oscillator which produces an output signal indicative of the frequency of the oscillator's oscillation which is proportional to the capacitance at the terminals of the electrode device. The output signal of the oscillator is connected to a microprocessor which is used to calculate a value proportional to the change in capacitance of the electrode device when the switches are closed. This value can be used to determine the dielectric constant or the percent moisture of the material in the chute.

REFERENCES:
patent: 3025465 (1959-10-01), Breen
patent: 3488758 (1970-01-01), Benson et al.
patent: 4555661 (1985-11-01), Benson et al.

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