Method of and apparatus for measuring the moisture content of fi

Details Method of and apparatus for measuring the moisture content of fi Method of and apparatus for measuring the moisture content of fi

1990-02-23

1992-02-04

Harvey, Jack B.

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Distributive type parameters

324640, 324643, 324647, 324667, G01R 2704, G01N 2204

Patent

active

050862790

ABSTRACT:
A hygroscopic commodity, such as a continuous stream of shredded tobacco, is transported past one or more sources of electrical energy and past one or more monitoring devices. One of the sources can expose the stream to the electric field of a capacitor in a high frequency oscillator circuit, and the other source can expose the stream to infrared waves or microwaves. The moisture in the stream influences the phase and/or the damping of oscillations of the electrical energy, and the monitoring device of devices ascertain the changes of such characteristics of the electrical energy and transmit corresponding signals to a processing circuit which processes the signals into moisture signals. The processing circuit can generate first quotient signals which are indicative of phase shift and damping of oscillations of electrical energy which has penetrated the stream, and second quotient signals denoting the phase shift and damping of waves which are reflected by the stream, and such first and second quotient signals are or can be averaged for processing into moisture signals. The moisture signals are not dependent upon the chemical and/or biological properties and/or upon the composition of the monitored commodity.

REFERENCES:
patent: 3693079 (1972-09-01), Walker
patent: 4052666 (1977-10-01), Fletcher et al.
patent: 4168466 (1979-09-01), Boldt
patent: 4297874 (1981-11-01), Sasaki
patent: 4634963 (1987-01-01), Lunden
patent: 4675595 (1987-06-01), Hane
patent: 4729386 (1988-03-01), Heitmann
patent: 4789820 (1988-12-01), Parrent, Jr. et al.

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