Measuring and testing – Moisture content or absorption characteristic of material
Patent
1985-12-11
1987-06-23
Frankfort, Charles
Measuring and testing
Moisture content or absorption characteristic of material
73159, 324 585A, G01R 2704
Patent
active
046743251
ABSTRACT:
A microwave moisture sensor operates on the principle that an emitted microwave is attenuated in rotary resonance with water molecules. The microwave moisture sensor includes measurement and reference signal systems sharing a microwave oscillator, a detector and other components, means for calculating the ratio of the signals from the respective systems, and an AGC circuit means for keeping the reference signal from the reference signal system at a predetermined level, so that drifts of the microwave oscillator, detector and other components will be cancelled and thus increased measuring accuracy will result. Furthermore, the microwave moisture sensor measure the basis weight and temperature of a material being measured, and processes the measured values according to predetermined moisture percentages free from adverse influences of the basis weight and temperature and thus increase the degree of measurement accuracy.
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Hirano Tokio
Kiyobe Seiichiro
Corr Denis E.
Frankfort Charles
Kojima Moonray
Yokogawa Hokushin Electric Corporation
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