公开(公告)号：US5157962A

公开(公告)日：1992-10-27

申请号：US738922

申请日：1991-08-01

申请人： John V. Fitzgerald ,  Teresa M. Walsh

发明人： John V. Fitzgerald ,  Teresa M. Walsh

IPC分类号： G01N11/16

CPC分类号： G01N11/16

摘要： A viscosity measuring transducer especially useful for process control of fluids. The transducer oscillates an immersed blade sensor in the direction of the plane of the blade in order to maximize generation of shear waves and to minimize generation of compression waves. The transducer includes a bar which penetrates and is secured and peripheral sealed to an isolation plate which serves to protect the oscillation driver and pickup adjacent one end of the bar from the sensor blade to be immersed in a fluid adjacent the other end of the bar. Either the bar is relatively rigid and the isolation plate is relatively compliant, or vice versa. In the former case the isolation plate acts as an intrinsic flexible member of the oscillating system of the transducer; and in both cases the isolation plate constitutes a strong impermeable seal between the fluid and the driver/pickup mechanism. The isolation plate may be corrugated or ribbed to allow vibratory motion in the desired direction (parallel to the sensor blade major surfaces) while resisting movement in the direction perpendicular thereto.

摘要翻译： 特别适用于流体过程控制的粘度测量传感器。 传感器在叶片平面的方向上振荡一个浸没的叶片传感器，以便最大限度地产生剪切波，并最大限度地减少压缩波的产生。 换能器包括穿过并被固定并且周边地密封到隔离板的杆，该隔离板用于保护邻近杆的一端的振动驱动器和拾取器与传感器刀片相浸入在与棒的另一端相邻的流体中。 或者钢筋相对刚性，并且隔离板相对顺从，反之亦然。 在前一种情况下，隔离板用作换能器的振荡系统的固有柔性构件; 并且在两种情况下，隔离板在流体和驱动器/拾取机构之间构成强的不可渗透的密封。 隔离板可以是波纹状或肋状的，以允许在垂直于其的方向上移动的同时在期望的方向（平行于传感器叶片主表面）的振动运动。

公开(公告)号：US5067344A

公开(公告)日：1991-11-26

申请号：US667238

申请日：1991-03-08

申请人： John V. Fitzgerald ,  Teresa M. Walsh

发明人： John V. Fitzgerald ,  Teresa M. Walsh

IPC分类号： G01N11/16

CPC分类号： G01N11/16

摘要： A viscosity measuring transducer especially useful for process control of fluids. The transducer oscillates an immersed blade sensor in the direction of the plane of the blade in order to maximize generation of shear waves and to minimize generation of compression waves. The transducer includes a bar which penetrates and is secured and peripheral sealed to an isolation plate which serves to protect the oscillation driver and pickup adjacent one end of the bar from the sensor blade to be immersed in a fluid adjacent the other end of the bar. Either the bar is relatively rigid and the isolation plate is relatively compliant, or vice versa. In the former case the isolation plate acts as an intrinsic flexible member of the oscillating system of the transducer; and in both cases the isolation plate constitutes a strong impermeable seal between the fluid and the driver/pickup mechanism. The isolation plate may be corrugated or ribbed to allow vibratory motion in the desired direction (parallel to the sensor blade major surfaces) while resisting movement in the direction perpendicular thereto.

摘要翻译： 特别适用于流体过程控制的粘度测量传感器。 传感器在叶片平面的方向上振荡一个浸没的叶片传感器，以便最大限度地产生剪切波，并最大限度地减少压缩波的产生。 换能器包括穿过并被固定并且周边地密封到隔离板的杆，该隔离板用于保护邻近杆的一端的振动驱动器和拾取器与传感器刀片相浸入在与棒的另一端相邻的流体中。 或者钢筋相对刚性，并且隔离板相对顺从，反之亦然。 在前一种情况下，隔离板用作换能器的振荡系统的固有柔性构件; 并且在两种情况下，隔离板在流体和驱动器/拾取机构之间构成强的不可渗透的密封。 隔离板可以是波纹状或肋状的，以允许在垂直于其的方向上移动的同时在期望的方向（平行于传感器叶片主表面）的振动运动。

公开(公告)号：US5054313A

公开(公告)日：1991-10-08

申请号：US554285

申请日：1990-07-17

申请人： John V. Fitzgerald ,  Teresa M. Walsh ,  Frank J. Matusik ,  John Stone ,  Edmond Dougherty ,  John Batton

发明人： John V. Fitzgerald ,  Teresa M. Walsh ,  Frank J. Matusik ,  John Stone ,  Edmond Dougherty ,  John Batton

IPC分类号： G01N11/00 ,  G01N11/16

CPC分类号： G01N11/16 ,  G01N2011/0006

摘要： Electronic control circuitry for obtaining precise inline process control data as to viscosity of fluids over a wide viscosity range, with high tolerance of ambient noise and vibration. An electromechanical transducer with an oscillating sensor is immersed in a flowing liquid, with the power required to sustain predetermined oscillation parameters being a measure of viscosity-density product. The gain of a variable gain amplifier which provides positive feedback to sustain oscillation is controlled in response to the integrated error signal output of a comparator which compares a DC value corresponding to the RMS amplitude of mechanical oscillation with a DC reference value. The monitoring of RMS amplitude rather than peak amplitude (as is done by a phase-sensitive sample-and-hold arrangement in the prior art), coupled integration of the error signal, results in a great improvement in immunity to ambient noise and vibration. Other features includes automatic calibration and temperature compensation whereby viscosity at a desired temperature can be determined even though the measurement is made at different temperature.

摘要翻译： 电子控制电路，用于获得精确的在线过程控制数据，用于在宽粘度范围内具有高粘度的环境噪声和振动。 将具有振荡传感器的机电换能器浸入流动的液体中，以维持预定振荡参数所需的功率为粘度密度乘积的量度。 响应于将对应于机械振荡的RMS幅度的DC值与DC参考值进行比较的比较器的积分误差信号输出来控制提供正反馈以维持振荡的可变增益放大器的增益。 RMS振幅的监测而不是峰值幅度（如现有技术中的相敏采样保持装置所做的），误差信号的耦合积分导致对环境噪声和振动的抗扰度的极大改进。 其他特征包括自动校准和温度补偿，由此即使在不同温度下进行测量，也可以确定所需温度下的粘度。