Method of measuring moisture content of dielectric materials

Details Method of measuring moisture content of dielectric materials Method of measuring moisture content of dielectric materials

1982-09-22

1986-04-01

Krass, Errol A.

Boots, shoes, and leggings

73 73, 324 61R, 364482, G01N 2556, G01R 2726

Patent

active

045802335

ABSTRACT:
The present invention is a method for measurement of moisture in dielectric materials. It is particularly useful for lumber. In the preferred version, at least two alternating current signals whose frequencies differ by a factor of at least 10 are capacitively coupled to the material. The coupling electrodes are in bridge circuits whose unbalance is measured at each frequency. The temperature of the dielectric material is also determined. Bridge unbalance signals are separated and rectified and the voltages, as well as a temperature analog voltage, are entered into a microprocessor programmed with a suitable algorithm to calculate a temperature corrected moisture value. The method overcomes significant inaccuracies in moisture readings due to temperature dependency.

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Water in Wood by C. Skaar, Syracuse University Press, Syracuse, N.Y., 1972, pp. 35-53.

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