公开(公告)号：US5973415A

公开(公告)日：1999-10-26

申请号：US920293

申请日：1997-08-28

申请人： Raul Brenner ,  Alex J. Esin ,  Lawrence J. Jones ,  Boris Rosselson

发明人： Raul Brenner ,  Alex J. Esin ,  Lawrence J. Jones ,  Boris Rosselson

IPC分类号： G01F23/26 ,  H01H35/00

CPC分类号： G01F23/268 ,  G01F23/265 ,  G01F23/266 ,  Y10T307/779 ,  Y10T307/826

摘要： A capacitive level sensor for sensing level of a in a vessel includes a sensor coupled to the vessel having a shield and an inner sensing rod. An oscillator provides an RF signal to the shield and the sensing rod. Comparison circuitry couples to the sensing rod provides a wet/dry output in response to capacitance between the inner sensing rod and the vessel, the capacitance related to the level of the liquid in the vessel.

摘要翻译： 用于感测容器中水位的电容式液位传感器包括耦合到容器的传感器，该传感器具有屏蔽层和内部感测杆。 振荡器向屏蔽和感测杆提供RF信号。 耦合到感测杆的比较电路响应于内部感测杆和容器之间的电容而提供湿/干输出，该电容与容器中液体的水平相关。

公开(公告)号：US5437178A

公开(公告)日：1995-08-01

申请号：US909538

申请日：1992-07-06

申请人： Alex Esin ,  Lawrence J. Jones ,  Boris Rosselson ,  Martin N. Sorenson

发明人： Alex Esin ,  Lawrence J. Jones ,  Boris Rosselson ,  Martin N. Sorenson

IPC分类号： G01F23/296 ,  G01F25/00 ,  G01N29/024 ,  G01N29/22 ,  G01N29/24 ,  A61B10/00

CPC分类号： G01N29/22 ,  G01F23/296 ,  G01F23/2965 ,  G01F25/0061 ,  G01F25/0076 ,  G01N29/024 ,  G01N2291/02818 ,  G01N2291/02836 ,  G01N2291/044

摘要： An ultrasonic transducer for measuring a property of a material within a defined space has a function of a velocity at which ultrasonic signals travel through the defined space includes a controller. The controller is adapted for coupling to a plurality of ultrasonic transducers. The controller include a multiplexer for selecting one of the plurality of ultrasonic transducers, signal processing means for processing an output of the selected ultrasonic transducer and controller means for providing parameters to the signal processing means based upon the selected ultrasonic transducer. The controller couples to a two wire 4-20 mA communication loop. The controller periodically excites the ultrasonic transducer to obtain a measurement. The controller stores power received from the two wire communication loop and excites the transducer using stored power. The controller is capable of providing power which exceeds that available directly from the two wire communication loop for a brief period of time. The controller provides a wet self-test whereby output level of the ultrasonic transducer is monitored while strength of the excitation signal provided to the ultrasonic transducer is decreased. The amount of decrease required for the output signal to pass a threshold level is an indication of the usefulness of the sensor.

摘要翻译： 用于测量在限定空间内的材料的特性的超声波换能器具有超声波信号穿过限定空间行进的速度的功能包括控制器。 该控制器适于耦合到多个超声换能器。 控制器包括用于选择多个超声波换能器中的一个的多路复用器，用于处理所选择的超声波换能器的输出的信号处理装置和用于基于所选择的超声换能器向信号处理装置提供参数的控制器装置。 控制器耦合到双线4-20 mA通信回路。 控制器周期性地激励超声换能器以获得测量值。 控制器存储从两线通信环路接收的功率，并使用存储的功率激励换能器。 控制器能够短时间地提供超过两线通信环路直接可用的功率。 控制器提供湿式自检，从而监测超声换能器的输出电平，同时提供给超声换能器的激励信号的强度降低。 输出信号通过阈值电平所需的减少量是传感器有用性的指标。

公开(公告)号：US5428984A

公开(公告)日：1995-07-04

申请号：US113973

申请日：1993-08-30

申请人： Lawrence Jones ,  Boris Rosselson ,  Alex Esin

发明人： Lawrence Jones ,  Boris Rosselson ,  Alex Esin

IPC分类号： G01F23/296 ,  G01F25/00 ,  G01F23/28

CPC分类号： G01F25/0061 ,  G01F23/2961

摘要： An ultrasonic liquid level sensor includes an ultrasonic coupling element for use in self testing. The sensor includes a gap and a pair of transducers spaced apart by the gap. The sensor senses presence of liquid in the gap. The ultrasonic coupling element extends between the transducers and acoustically couples them together. The coupling element is used to test ultrasonic sensor integrity.

摘要翻译： 超声波液位传感器包括用于自检的超声波耦合元件。 传感器包括间隙和间隙间隔开的一对换能器。 传感器感测到间隙中液体的存在。 超声波耦合元件在换能器之间延伸并将它们声耦合在一起。 耦合元件用于测试超声波传感器的完整性。