Microwave moisture sensor
    2.
    发明授权
    Microwave moisture sensor 失效
    微波水分传感器

    公开(公告)号:US4674325A

    公开(公告)日:1987-06-23

    申请号:US807126

    申请日:1985-12-11

    IPC分类号: G01N22/04 G01R27/04

    CPC分类号: G01N22/04

    摘要: 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.

    摘要翻译: 微波湿度传感器的工作原理是发射的微波与水分子的旋转谐振衰减。 微波湿度传感器包括共享微波振荡器的测量和参考信号系统,检测器和其它组件,用于计算来自各个系统的信号的比率的装置和用于将来自参考信号系统的参考信号保持在 使得微波振荡器,检测器和其他部件的漂移将被消除,从而导致测量精度的提高。 此外,微波湿度传感器测量待测材料的基重和温度,并且根据预定的水分百分比处理测量值,而不受基重和温度的不利影响,从而增加了测量精度。