Microwave moisture sensor

Details Microwave moisture sensor Microwave moisture sensor

G - Physics

01

N

354/30, 73/71, 3

G01N 22/04 (2006.01) G01N 25/58 (2006.01)

Patent

CA 1222397

ABSTRACT A microwave moisture sensor operates on the principle that an emit- ted 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 others, Means for calculating a ratio of the signals from the respective systems, and an AGC circuit for keeping the reference signal from the reference signal system at a predeter- mined level, so that drifts of the microwave oscillator, detector and others will be cancelled for an increased measuring accuracy. Furthermore, the micro- wave moisture sensor measures a basis weight and temperature of a material being measured, and processes the measured values according to predetermined compensation characteristics to determine a moisture percentage free from in- fluences of the basis weight and temperature at an increased degree of acc- uracy.

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