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    • 4. 发明授权
    • Method and apparatus for determining the moisture content of different
kinds of materials
    • 确定不同种类材料含水量的方法和装置
    • US4019132A
    • 1977-04-19
    • US579950
    • 1975-05-22
    • Ernst Loch
    • Ernst Loch
    • G01N27/04G01R27/02
    • G01N27/048
    • A method and apparatus for determining the moisture content of different kinds of materials wherein electrodes having a voltage supplied thereto are applied to the material to be tested for providing a measuring current corresponding to the moisture content of the material. The measuring current is applied to an amplifier having a low-valued input resistance and the moisture content is determined by adjusting a scale graduated in moisture values in accordance with the output of the amplifier. A balancing device is provided for balancing the output of the amplifier and the scale is connected to the balancing device to indicate a balance position as the moisture content value. The amplifier is also provided with a device for converting the measuring current to a voltage corresponding to the logarithm of change in current and a device for providing temperature compensation.
    • 一种用于确定不同种类材料的水分含量的方法和装置,其中具有供应电压的电极被施加到待测试的材料上,以提供与材料的水分含量相对应的测量电流。 测量电流被施加到具有低值输入电阻的放大器,并且通过根据放大器的输出调节按湿度值分级的刻度来确定水分含量。 提供平衡装置用于平衡放大器的输出,并且刻度尺连接到平衡装置以指示作为水分含量值的平衡位置。 放大器还具有用于将测量电流转换成对应于电流变化对数的电压的装置和用于提供温度补偿的装置。