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    • 87. 发明申请
    • SOIL MOISTURE SENSOR
    • 土壤水分传感器
    • WO2007002994A1
    • 2007-01-11
    • PCT/AU2006/000925
    • 2006-07-03
    • SENVIRO PTY LTDDAVIS, Stephen, CharlesJOHNSON, PeterHUBERTS, John
    • DAVIS, Stephen, CharlesJOHNSON, PeterHUBERTS, John
    • G01N27/22G01N33/24G01R27/26
    • G01N27/223G01D5/2405G01N33/246Y10T137/0324
    • A soil moisture sensor which includes a processor to derive soil moisture values and a memory store associated with said processor to store measured values on a periodic basis, wherein the processor scales the stored moisture values to establish a moisture range for the sensor that can be used to calibrate each new reading. The sensor includes a capacitive sensor. In one embodiment the processor measures the capacitance at a single frequency and also measures the phase and amplitude to derive measures of soil impedance due to moisture content and conductivity. In another embodiment the soil sensor capacitor is part of a resonant circuit and the resonant frequency of the circuit is measured as an indication of soil moisture. The sensor is constructed on a single substrate, which also functions as its own insertion stake into the soil.
    • 一种土壤湿度传感器,其包括用于导出土壤水分值的处理器和与所述处理器相关联的存储器存储器,以周期性地存储测量值,其中处理器缩放存储的水分值以建立可以使用的传感器的水分范围 校准每个新的阅读。 该传感器包括电容传感器。 在一个实施例中,处理器以单个频率测量电容,并且还测量相位和幅度以导出由于水分含量和电导率引起的土壤阻抗的测量。 在另一个实施例中,土壤传感器电容器是谐振电路的一部分,并且测量电路的谐振频率作为土壤水分的指示。 传感器构造在单个基板上,也可以作为其自身插入土壤的作用。