Determination of moisture level in materials

Details Determination of moisture level in materials Determination of moisture level in materials

1980-06-13

1982-09-28

Krawczewicz, Stanley T.

Electricity: measuring and testing

Conductor identification or location

Inaccessible

204195W, G01R 2726

Patent

active

043520596

ABSTRACT:
A method for determining the moisture content of dielectric materials is described wherein a sample of the material is placed between two electrodes and an electric field is applied. An alternating frequency in the range of radio waves and lower is applied to the electrodes and the dielectric loss properties of the material are determined. The dielectric loss properties are then used to determine moisture content. In an alternate embodiment, a step voltage is applied to the electrodes and the direct current is monitored. The decrease in value of direct current during a time interval following the application of the step voltage is used to determine the moisture content.

REFERENCES:
patent: 3252086 (1966-05-01), Lundstrom
patent: 3657644 (1972-04-01), Beam et al.
patent: 3684952 (1972-08-01), Lundstrom
patent: 3778707 (1973-12-01), Vogel
patent: 4097743 (1978-06-01), Carlson
patent: 4109033 (1978-08-01), Blankenhorn
Antson et al., Capacitive Moisture Detector, Sahko, 1974, pp. 11, 12.
Rushton et al., The Dielectric Properties of Nylon, The British Electrical and Allied Industries Research Association, Sep. 14, 1956, pp. 1-11.
Quadra-Beam Moisture Analyzer Instruction Manual.

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