公开(公告)号：US4478527A

公开(公告)日：1984-10-23

申请号：US446122

申请日：1982-12-02

申请人： George C. Mergner

发明人： George C. Mergner

IPC分类号： G01D3/036 ,  G01L19/04 ,  G01K7/00

CPC分类号： G01D3/036 ,  G01L9/125

摘要： There is provided a differential amplifier having a plurality of inputs connected through input resistors to a summing junction at the inverting input of a differential amplifier which also has a negative feedback path having a feedback resistor. One of the input resistors is connected to the output signal of the primary element or transducer. A second of the input resistors is connected to a zero compensating signal which varies with changes in the temperature of the transducer from a certain value at a reference temperature. A third input resistor is connected to a fixed signal of a value which is adjusted to correspond to the certain value of the compensating signal at the reference temperature but of opposite polarity so as to tend to cancel the compensating signal when the transducer is at the reference temperature. The combination of the three inputs then produces an output from the differential amplifier corrected for changes in the zero of the measurement due to temperature changes.

摘要翻译： 提供了一种差分放大器，其具有通过输入电阻器连接到差分放大器的反相输入处的求和点的多个输入端，该差分放大器还具有具有反馈电阻器的负反馈路径。 其中一个输入电阻连接到主元件或换能器的输出信号。 输入电阻器中的第二个连接到零点补偿信号，该零点补偿信号随着换能器温度随基准温度的某个值的变化而变化。 第三输入电阻连接到一个值的固定信号，该固定信号被调整以对应于在参考温度下但是具有相反极性的补偿信号的特定值，以便当换能器处于参考时倾向于消除补偿信号 温度。 然后，三个输入的组合产生由于温度变化而校正为测量零点的变化的差分放大器的输出。

公开(公告)号：US4193063A

公开(公告)日：1980-03-11

申请号：US905688

申请日：1978-05-15

申请人： James J. Hitt ,  George C. Mergner

发明人： James J. Hitt ,  George C. Mergner

IPC分类号： G01L9/00 ,  G01L9/12 ,  G01R27/26 ,  G08C19/10 ,  G08C19/00

CPC分类号： G08C19/10 ,  G01L9/0072 ,  G01L9/12 ,  G01R27/2605

摘要： The displacement of the diaphragm in a differential pressure sensor of the differential capacitor type produces an output signal substantially linearly related to the displacement. The capacitors are charged in parallel from a constant current source for a fixed period of time and discharged through separate discharge circuits for another fixed period of time. An integrating differential amplifier connected to the two capacitors as they discharge produces an output signal related to the area between the two discharge curves which is substantially linearly related to the extent of displacement of the diaphragm of the differential pressure sensor. The output from the amplifier is used to control the current output from the device.

摘要翻译： 差分电容器类型的差压传感器中的隔膜的位移产生与位移基本线性相关的输出信号。 电容器从恒定电流源并联充电一段固定的时间，并通过单独的放电电路放电一段固定的时间。 在放电时，与两个电容器连接的积分差分放大器产生与两个放电曲线之间的区域相关的输出信号，该输出信号基本上与差压传感器的隔膜的位移程度线性相关。 放大器的输出用于控制器件的电流输出。