| 摘要 |
<p>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 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 predetermined level, so that drifts of the microwave oscillator, detector and others will be cancelled for an increased measuring accuracy. Furthermore, the microwave 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 influences of the basis weight and temperature at an increased degree of accuracy.</p> |
