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公开(公告)号：EP2286191A1
公开(公告)日：2011-02-23
申请号：EP09763076.8
申请日：2009-04-17
发明人： KNOWLES, Terence, J.
IPC分类号： G01F23/296
CPC分类号： G01F23/2962
摘要： A system for detecting a presence of a liquid within a receptacle includes a sensor and a processor. The sensor includes a transmitting probe and a receiving probe positioned within the liquid receptacle. The transmitting probe includes a first transducer and the receiving probe includes a second transducer. The processor is in electrical communication with the first and second transducers and monitors the first and second transducers to determine the presence and level of the liquid within the liquid receptacle based on a time between generation of a first extensional wave by the first transducer and reception of a second extensional wave by the second transducer.
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公开(公告)号：EP1924986A2
公开(公告)日：2008-05-28
申请号：EP06788088.0
申请日：2006-07-21
IPC分类号： G09G5/00
CPC分类号： H03K17/96 , E05Y2400/852 , E05Y2400/86 , H03K2217/96011
摘要： Certain embodiments provide an acoustic wave touch bar system and method of use. Certain embodiments include a bar having two portions of reduced cross-section forming an acoustic cavity in the portion of the bar between the reduced cross-sections. The system includes an acoustic wave transducer positioned on the acoustic wave cavity, wherein the transducer generates an acoustic standing wave that is substantially trapped in the acoustic cavity. The system also includes a circuit coupled to the transducer and responsive to a change in an output of the transducer to detect a touch on a touch surface of the bar. The circuit may be a programmable and/or adaptive circuit, for example. The circuit may detect a change in an exponentially decaying response of the transducer indicating that the touch surface of the bar has been touched.
摘要翻译： 某些实施例提供了一种声波触摸杆系统和使用方法。 某些实施例包括具有减小横截面的两个部分的条形件，其在横截面减小的部分之间的条部分中形成声腔。 该系统包括定位在声波腔上的声波换能器，其中换能器产生基本上被俘获在声腔中的声驻波。 该系统还包括耦合到换能器并且响应于换能器的输出的改变以检测杆的触摸表面上的触摸的电路。 例如，该电路可以是可编程和/或自适应电路。 该电路可以检测换能器的指数衰减响应中的变化，其指示条的触摸表面已经被触摸。
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公开(公告)号：EP1547243B1
公开(公告)日：2011-08-10
申请号：EP03797865.7
申请日：2003-08-27
发明人： KNOWLES, Terence, J.
CPC分类号： H03K17/96 , H03K2217/96011
摘要： An acoustic wave sensor includes an electromagnetic acoustic transducer to generate a resonant acoustic wave substantially trapped in an acoustic wave cavity. The acoustic wave cavity (12) is defined by a radially symmetric raised surface. The electromagnetic acoustic transducer includes a spiral primary coil (30) to generate the acoustic wave in the acoustic wave cavity (12) and a concentric spiral pickup coil (32) to pick up an electrical signal representing the acoustic wave in the cavity (12). A noise canceling coil (34) portion is used to cancel spurious noise induced by the primary coil (30) from the pickup coil (32) to provide an output signal representing the acoustic wave energy in the cavity (12).
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公开(公告)号：EP1446792B1
公开(公告)日：2009-12-02
申请号：EP02761841.2
申请日：2002-09-30
CPC分类号： H03K17/96 , H01H2239/054 , H03K2217/96011
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