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公开(公告)号：US4058766A
公开(公告)日：1977-11-15
申请号：US697858
申请日：1976-06-21
申请人： Ronald F. Vogel , Robert R. Boldt , Kevin D. McKee , Roy E. Resh , Paul E. West
发明人： Ronald F. Vogel , Robert R. Boldt , Kevin D. McKee , Roy E. Resh , Paul E. West
CPC分类号： G01R27/2623 , G01N27/228
摘要： As in prior testers, a capacitive cell in which material is placed to be tested is connected in a voltage divider circuit. However, signal generating means connected to the voltage divider applies voltages at different predetermined frequencies selected for the material being tested, and frequency selective means connected to the cell develop voltages at the applied frequencies having values dependent on the impedance of the filled cell at the respective frequencies. These voltages developed across the cell are applied to a computer that provides an output according to an equation that has been derived statistically from many samples of the material being tested for the substance or quality of the material being measured.
摘要翻译： 如在先前的测试器中，其中放置被测试材料的电容单元在分压器电路中连接。 然而，连接到分压器的信号发生装置施加针对被测试材料选择的不同预定频率的电压，并且连接到电池的频率选择装置以施加的频率产生具有取决于填充电池在相应的电池的阻抗的值的电压 频率 在整个电池上产生的这些电压被施加到计算机，该计算机根据已被测量材料的许多样品从被测材料的物质或质量统计学得出的等式提供输出。
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公开(公告)号：US4399404A
公开(公告)日：1983-08-16
申请号：US237368
申请日：1981-02-23
申请人： Roy E. Resh
发明人： Roy E. Resh
CPC分类号： G01R1/07 , G01N27/223
摘要： The tester has a probe to be inserted into granular or fluid materials for measuring instantly permittivity and temperature. The characteristics of materials are measured according to permittivity, the characteristics of moisture of grains being used as an example in the present embodiment. Features of the tester include: a sensing capacitor within a tip of the probe being an extension of a printed circuit board mounted within a main casing of the probe, an adjustable printed-circuit type capacitor as a reference in cooperation with the sensing capacitor in a balanced input circuit, touch-type switches to which battery is continually supplied to select instantly different calibrations for different characteristic curves without operation of any other switches, and the use of voltage dividers selected by the switches to provide a voltage for zero crossing and another voltage to adjust gain according to the slope of a desired curve, the voltages from a voltage divider for different gains being varied as a function of temperature at the probe.
摘要翻译： 测试仪具有插入到颗粒或流体材料中的探针，用于瞬时测量介电常数和温度。 材料的特性根据介电常数，作为本实施方式的实施例使用的晶粒的湿度特性进行测定。 测试仪的特征包括：探针尖端内的感测电容器是安装在探针的主壳体内的印刷电路板的延伸部分，可调印刷电路型电容器作为参考，与感测电容器 平衡输入电路，连续供电电池的触摸式开关，可选择不同特性曲线的瞬时不同校准，而无需任何其他开关的操作，以及使用开关选择的分压器可提供过零电压和另一电压 根据所需曲线的斜率来调节增益，来自不同增益的分压器的电压作为探头温度的函数而变化。
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