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2. 发明申请

WO1997020191A1 TIME DOMAIN DELAY MEASUREMENT APPARATUS AND ASSOCIATED METHOD 审中-公开
标题翻译：时域延迟测量装置和相关方法
公开(公告)号：WO1997020191A1
公开(公告)日：1997-06-05
申请号：PCT/US1996018035
申请日：1996-11-14
申请人： SAWTEK, INC. , ANDERSEN, Jorgen, W.
发明人： SAWTEK, INC.
IPC分类号： G01H05/00
CPC分类号： G01P5/247 , G01H5/00
摘要： An embodiment of a sensing apparatus includes an ultrasonic delay sensor having a delay related to the sensed quantity; and a time domain analysis circuit for recirculating pulses through the ultrasonic delay sensor or device and for generating the output signal related to the sensed quantity. In particular, the time domain analysis circuit may include a pulse generator for generating a series of input pulses to the ultrasonic delay sensor; a pulse detector for detecting a series of output pulses after propagation through the ultrasonic delay sensor; and a pulse recirculating circuit for causing the pulse generator to generate the series of input pulses based upon respective previously detected output pulses from the pulse detector. The apparatus also preferably includes circuits for suppressing the undesirable reflections generated by the ultrasonic delay sensor. For example, random phase switching may be used for randomly switching phases of the series of input pulses to the ultrasonic delay sensor to thereby reduce undesired reflections. In addition, a fixed delay may be operatively connected between the pulse detector and the pulse generator. Also time diversity matching to the ultrasonic delay device may also be used to suppress the effects of undesired reflections. Method aspects of the invention are also disclosed.
摘要翻译：感测装置的实施例包括具有与感测量相关的延迟的超声波延迟传感器; 以及时域分析电路，用于使脉冲再循环通过超声波延迟传感器或装置，并用于产生与感测量有关的输出信号。特别地，时域分析电路可以包括用于产生到超声波延迟传感器的一系列输入脉冲的脉冲发生器; 脉冲检测器，用于在通过超声波延迟传感器传播之后检测一系列输出脉冲; 以及脉冲再循环电路，用于使得脉冲发生器基于来自脉冲检测器的相应的先前检测到的输出脉冲来产生一系列输入脉冲。该装置还优选地包括用于抑制由超声波延迟传感器产生的不希望的反射的电路。例如，随机相位切换可以用于将一系列输入脉冲的相位随机切换到超声波延迟传感器，从而减少不期望的反射。此外，固定延迟可以可操作地连接在脉冲检测器和脉冲发生器之间。此外，还可以使用与超声波延迟装置的时间分集匹配来抑制不期望的反射的影响。还公开了本发明的方法方面。

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