Transducer temperature compensation circuit
    92.
    发明公开
    Transducer temperature compensation circuit 失效
    Messwandler-Temperaturkompensationsschaltung。

    公开(公告)号:EP0392746A2

    公开(公告)日:1990-10-17

    申请号:EP90303688.7

    申请日:1990-04-06

    IPC分类号: G01L1/22 G01L19/04 G01L9/06

    摘要: In order to compensate for the effects of temperature variations on a transducer such as a piezo-resistive bridge (1), the bridge is fed from a temperature dependent power supply circuit (6-17). The power supply circuit comprises a temperature sensitive element (11) with first and second adjustment means (16, 15) for adjusting the slope of supply voltage for the transducer against temperature on first and second sides, respectively, of a predetermined temperature. The second adjustment means (15) provides an adjustment which is independent of the first adjustment means so that repeated temperature cycling during calibration is unnecessary.

    摘要翻译: 为了补偿温度变化对诸如压电桥(1)的传感器的影响,桥接器从温度相关电源电路(6-17)馈送。 电源电路包括具有第一和第二调节装置(16,15)的温度敏感元件(11),用于分别调节针对传感器的电源电压的斜率,以抵抗预定温度的第一和第二侧的温度。 第二调节装置(15)提供独立于第一调节装置的调节,使得校准期间重复的温度循环是不必要的。

    PRESSURE COMPENSATED DIFFERENTIAL PRESSURE SENSOR AND METHOD.
    94.
    发明公开
    PRESSURE COMPENSATED DIFFERENTIAL PRESSURE SENSOR AND METHOD. 失效
    压力补偿差压表。

    公开(公告)号:EP0177491A4

    公开(公告)日:1988-03-30

    申请号:EP84901555

    申请日:1984-03-30

    申请人: ROSEMOUNT INC

    发明人: CUCCI GERALD R

    IPC分类号: G01L9/00 G01L13/06 G01L19/04

    CPC分类号: G01L9/125

    摘要: A differential pressure sensor (10) senses a difference in pressure between a first input (low) pressure (12) or "reference pressure" and a second input (high) pressure (14) and provides a differential sensor signal representative of the difference in pressure. The reference pressure is sensed by a reference pressure sensor (26) which provides a reference signal representative of the reference pressure. The differential sensor signal and the reference signal are provided to a correction circuit. The correction circuit (24), which is preferably a digital computer, adjusts the reference signal and provides an improved output signal as a function of the differential sensor signal and the adjusted reference signal.

    Pressure transducer for use with any one of a series of detachable pressure domes of similar construction
    96.
    发明公开
    Pressure transducer for use with any one of a series of detachable pressure domes of similar construction 失效
    压力传感器与任何可移除式压力罩的类似结构中使用。

    公开(公告)号:EP0180954A2

    公开(公告)日:1986-05-14

    申请号:EP85114027.7

    申请日:1985-11-05

    IPC分类号: G01L9/04 G01L19/04 A61B5/02

    CPC分类号: A61B5/0215 G01L9/025

    摘要: The temperature coefficient of the combination of a transducer (T) and any one of a plurality of disposable plastic domes (D) manufactured to given specifications is reduced substantially to zero by making the temperature coefficient of the transducer (T) when the pressure dome (D) is not mounted therto equal in magnitude and opposite in sign to the change in temperature coefficient that results from mounting the average dome (D) to the transducer (T). The temperature coefficient of the transducer (T) is permanently adjusted by laser trimming a temperature-dependent resister (R x , R T ) of a bridge circuit (R A . R B , R C , R V , R T , R x . Ry) coupled to be imbalanced by variations in a pressure sensitive impedance (Z) of the transducer (T).

    Differential pressure apparatus
    97.
    发明公开
    Differential pressure apparatus 失效
    差压装置

    公开(公告)号:EP0093450A3

    公开(公告)日:1984-04-18

    申请号:EP83104327

    申请日:1983-05-02

    IPC分类号: G01L13/06 G01L19/04 G01L01/22

    CPC分类号: G01L1/2281 G01L9/045

    摘要: A differential pressure unit to induce tension and compression in respective strain gages to produce a change in the output of a Wheatstone bridge. The differential pressure or some function thereof is then indicated. Error due to temperature is avoided by maintaining the bridge current constant The bridge voltage is elevated as a function of temperature to make the bridge current or bridge output independent of temperature.

    TEMPERATURE COMPENSATING PRESSURE SENSOR AMPLIFIER CIRCUITS.
    98.
    发明公开
    TEMPERATURE COMPENSATING PRESSURE SENSOR AMPLIFIER CIRCUITS. 失效
    温度补偿放大器电路FOR压力转换。

    公开(公告)号:EP0050135A4

    公开(公告)日:1983-11-21

    申请号:EP81901065

    申请日:1981-03-16

    申请人: MOTOROLA INC

    CPC分类号: G01L9/045 G01D3/036 H03F1/302

    摘要: Amplifier circuit for temperature compensating the output voltage thereof with respect to undesirable temperature induced signals from a silicon pressure transducer (10) and/or from components of the amplifier itself. The amplifier includes a first operational amplifier (50) and a second operational amplifier (68). A first circuit connects the output terminal of the first operational amplifier through a summing node (66) to one input terminal (70) of the second amplifier. Output signals from the pressure transducer are applied between one input terminal (52) of the first operational amplifier and another input terminal (72) of the second amplifier. A temperature compensating circuit (116) is connected to the summing node for enabling the output voltage of the amplifier to be substantially independent of temperature. An initial offset voltage compensating circuit (80) is coupled to the summing node for adjusting the intercept of the pressure-to-output voltage transfer curve. The gain of the second operational amplifier determines the slope of the curve.

    Differential pressure apparatus
    99.
    发明公开
    Differential pressure apparatus 失效
    Differentialdruckmessvorrichtung。

    公开(公告)号:EP0093450A2

    公开(公告)日:1983-11-09

    申请号:EP83104327.8

    申请日:1983-05-02

    IPC分类号: G01L13/06 G01L19/04 G01L1/22

    CPC分类号: G01L1/2281 G01L9/045

    摘要: A differential pressure unit to induce tension and compression in respective strain gages to produce a change in the output of a Wheatstone bridge. The differential pressure or some function thereof is then indicated. Error due to temperature is avoided by maintaining the bridge current constant The bridge voltage is elevated as a function of temperature to make the bridge current or bridge output independent of temperature.