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    • 4. 发明授权
    • Method of measuring moisture content of dielectric materials
    • 测量电介质材料含水量的方法
    • US4580233A
    • 1986-04-01
    • US421624
    • 1982-09-22
    • Robert S. ParkerFrank C. Beall
    • Robert S. ParkerFrank C. Beall
    • G01N27/22G01N33/46G01N25/56G01R27/26
    • G01N33/46G01N27/223
    • 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.
    • 本发明是测定电介质材料中的水分的方法。 它对木材特别有用。 在优选版本中,至少两个频率相差至少为10的交流信号被电容耦合到该材料。 耦合电极在桥接电路中,其在每个频率处测量不平衡。 还确定介电材料的温度。 桥接不平衡信号被分离和整流,并且将电压以及温度模拟电压输入到用适当算法编程的微处理器中以计算温度校正水分值。 该方法克服了由于温度依赖性导致的湿度读数的严重不准确。