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    • 2. 发明授权
    • Moisture measuring apparatus
    • 水分测量仪
    • US4655076A
    • 1987-04-07
    • US573230
    • 1984-01-23
    • Gary R. WeiheRoger D. Lion
    • Gary R. WeiheRoger D. Lion
    • G01N19/10
    • G01N19/10
    • An apparatus for measuring the moisture content of soil includes a chamber having a water-swellable material in the chamber, the chamber being sized so that the water-swellable material can swell to its fully swollen state, with the external resistance, if any, against the swelling being substantially constant. The device includes a device for transmitting water to the water-swellable material so that it is in equilibrium with the environment. A sensor responsive to the volume of the water-swellable material is provided to indicate the water content of the environment exterior of the apparatus. The preferred sensor is a magnet moveable by the water-swellable material and a Hall effect sensing device.
    • 用于测量土壤含水量的装置包括在室中具有水溶胀材料的室,该室的尺寸使得水溶胀性材料可以膨胀至其完全膨胀的状态,如果有的话,外部阻力 肿胀基本上恒定。 该装置包括用于将水传递到水可溶胀材料以使其与环境平衡的装置。 提供响应于水可溶胀材料的体积的传感器以指示设备外部的环境的含水量。 优选的传感器是由水可溶胀材料和霍尔效应感测装置可移动的磁体。