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1. 发明授权

US5473245A Magnetostrictive linear displacement transmitter having improved piezoelectric sensor 失效
标题翻译：具有改进的压电传感器的磁致伸缩线性位移传感器
公开(公告)号：US5473245A
公开(公告)日：1995-12-05
申请号：US147028
申请日：1993-11-04
申请人： Howard S. Silvus, Jr. , Edward J. Miller, Jr. , J. Marion Matherne , Tony W. Harper
发明人： Howard S. Silvus, Jr. , Edward J. Miller, Jr. , J. Marion Matherne , Tony W. Harper
IPC分类号： G01B7/00 , G01B7/02 , G01F23/02 , G01F23/72 , G01B7/14 , G01F23/30 , H03H9/00
CPC分类号： G01F23/72 , G01B7/003 , G01B7/02 , G01F23/02
摘要： An improved magnetostrictive wire based position transducer that has applications in both liquid level measuring systems and in position indicating systems. A cylindrically structured and circularly polarized piezoelectric element directly measures the torsional acoustic waves in the magnetostrictive wire as they are received by the sensor. The cylindrical structure of the sensor eliminates many of the inadvertently detected acoustic and electrical pulses within the wire that are not indicative of the passage of the torsional wave of concern. The present system provides an improved sensor configuration which is selectively sensitive to torsional waves while being insensitive to vibrations in alternate planes. This improved piezoelectric sensor in combination with the electrical configuration allows placement of the magnetostrictive wire apart from the liquid whose level is being measured or from the indicator whose position is of concern. The system provides a means for transmitting the liquid level within a container to a sensor column outside of the container in a manner that improves access, maintenance, calibration, and installation. In the preferred embodiment, each of the above improvements is provided in a system that incorporates an instrumentation loop powered microprocessor based transmitter with low current requirements and increased sensitivity.
摘要翻译：一种改进的基于磁致伸缩线的位置传感器，其具有在液位测量系统和位置指示系统中的应用。圆柱形结构的圆偏振压电元件直接测量磁致伸缩导线中由传感器接收的扭转声波。该传感器的圆柱形结构消除了许多在线内无意中检测到的声和电脉冲，这些脉冲和电脉冲并不表示所关注的扭转波的通过。本系统提供改进的传感器配置，其对扭转波选择性敏感，同时对交替平面中的振动不敏感。这种改进的压电传感器与电气结构相结合，允许将磁致伸缩电线放置在与被测量电平的液体或从其位置关注的指示器的位置。该系统提供了一种用于将容器内的液位传送到容器外部的传感器柱的方式，以改善进入，维护，校准和安装的方式。在优选实施例中，上述改进的每一个都提供在一个系统中，该系统结合了具有低电流要求和增加的灵敏度的基于仪器回路供电的基于微处理器的发射器。

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