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1. 发明授权

US4926693A Contactless actuator piston proximity sensor 失效
标题翻译：非接触式执行器活塞接近传感器
公开(公告)号：US4926693A
公开(公告)日：1990-05-22
申请号：US201940
申请日：1988-06-03
申请人： James W. Holm-Kennedy , Eric H. Kawamoto , Thomas T. Bopp
发明人： James W. Holm-Kennedy , Eric H. Kawamoto , Thomas T. Bopp
IPC分类号： B60G17/019 , F15B15/28 , G01H13/00 , G01S11/14
CPC分类号： G01S11/14 , B60G17/01933 , F15B15/28 , G01H13/00 , B60G2202/41 , B60G2400/25 , B60G2401/176
摘要： This invention relates to contactless proximity sensing transducers and more particularly concerns a single crystal ultrasonic interferometer comprised of a piezoelectric crystal attached to a Pyrex plate for acoustic impedance matching purposes. When driven at the crystal's resonant frequency, the electrical impedance of the crystal becomes sensitive to the input acoustical impedance of the interferometric path length between the crystal and the target object. By monitoring the crystal impedance at a fixed frequency as target position is varied, the sensor is capable of determining the incremental displacement of the moving target. By monitoring the crystal impedance at a fixed target position as the driving frequency is varied, the sensor is capable of determining the absolute proximity of the target. The geometry of the piezoelectric crystal and the Pyrex plate are used to affect the resolution and frequency response of the sensor.
摘要翻译：本发明涉及非接触式接近传感传感器，更具体地说，涉及一种单晶超声波干涉仪，它包括一个连接到Pyrex平板上用于声阻抗匹配目的的压电晶体。当以晶体谐振频率驱动时，晶体的电阻抗对晶体和目标物体之间的干涉路径长度的输入声阻抗敏感。通过在目标位置变化时监测固定频率下的晶体阻抗，传感器能够确定移动目标的增量位移。通过在驱动频率变化时监测固定目标位置处的晶体阻抗，传感器能够确定目标的绝对接近度。压电晶体和Pyrex板的几何形状用于影响传感器的分辨率和频率响应。

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