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    • 99. 发明授权
    • Method and device for non-invasive monitoring of hydration state of
plants
    • 用于非植物监测水稻状态的方法和装置
    • US5224769A
    • 1993-07-06
    • US816737
    • 1992-01-03
    • Noel M. HolbrookMichael J. Burns
    • Noel M. HolbrookMichael J. Burns
    • G01N27/22
    • G01N27/223
    • A system for the non-invasive monitoring of the hydration state of a plant comprising the elements:a timing capacitor comprising a plurality of conductive elements adapted for mounting on a plant part to sense the hydration state capacitance of the plant part;a capacitance-to-frequency converter electrically connected to the timing capacitor comprising an oscillator circuit having a frequency dependent upon the value of the timing capacitor and independent of the electrical losses in said timing capacitor;means for supplying electrical power to the capacitance-to-frequency converter;means for measuring the frequency generated by the capacitance-to-frequency converter, the frequency bearing a known relationship to the dielectric constant and, hence, the water content of the plant part; anddevices for electrically guarding the circuit generated by the elements from capacitance extraneous to the plant part comprising means for surrounding the elements with shields of electrical potential substantially equal to that of the timing capacitor.
    • 一种用于非侵入式监测植物水合状态的系统,包括元件:定时电容器,包括适于安装在植物部分上以感测植物部分的水合状态电容的多个导电元件; 电连接到定时电容器的电容 - 频率转换器,包括具有取决于定时电容器的值的频率并且与所述定时电容器中的电损耗无关的振荡器电路; 用于向电容 - 频率转换器供电的装置; 用于测量由电容 - 频率转换器产生的频率的装置,该频率与介电常数有已知关系,因此与植物部分的含水量有关; 以及用于对由元件产生的电路进行电保护的器件与设备部分无关的电容器包括用于围绕具有基本上等于定时电容器的电势屏蔽的元件的装置。