Active damping of ultrasonic receiving sensors through engineered pressure waves
Active damping of ultrasonic receiving sensors through engineered pressure waves
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DOI：
10.1088/1361-6463/abd582
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发表时间：
2021-01
期刊：
影响因子：
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通讯作者：
S. Dixon;L. Kang;A. Feeney;W. Somerset
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文献类型：
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作者：
S. Dixon;L. Kang;A. Feeney;W. Somerset
用于超声传感和测量的换能器通常在短脉冲信号下工作，例如，在发电换能器上以特定的激励电压和频率运行几个周期。窄带换能器在检测时的振动响应通常以共振振铃为主，这严重影响了其对相似时间到达接收器的两个或两个以上信号的检测能力。以前的研究人员专注于抑制变送器在传输中的振铃，以产生暂时较短的输出压力波的策略。然而，如果接收换能器是窄带的，则无论接收换能器上的入射压力波在时间上有多短，入射压力波都会对该接收换能器产生显著的振铃。这可能会降低常见测量过程的准确性，因为信号在时间上很长，而且多个波的到达可能很难彼此区分。在这项研究中，使用弯曲超声换能器(FUT)演示了一种接收中的阻尼换能器的方法。这种窄带换能器可以有效地作为超声波的发射器或接收器工作，由于其在汽车应用中的使用，是现有的最常见的超声波换能器。现有的换能器的数学模拟被用于指导工程压力波的设计，以主动地抑制接收FUT。在换能器上的实验测量表明，只要在产生换能器上使用合适的驱动电压波形，在不显著影响灵敏度的情况下，超声波接收器的谐振振铃可以减少80%。
Transducers for ultrasonic sensing and measurement are often operated with a short burst signal, for example a few cycles at a specific excitation voltage and frequency on the generating transducer. The vibration response of a narrowband transducer in detection is usually dominated by resonant ringing, severely affecting its ability to detect two or more signals arriving at the receiver at similar times. Prior researchers have focused on strategies to damp the ringing of a transducer in transmission, to create a temporally short output pressure wave. However, if the receiving transducer is narrowband, the incident pressure waves can create significant ringing of this receiving transducer, irrespective of how temporally short the incident pressure waves are on the receiving transducer. This can reduce the accuracy of common measurement processes, as signals are temporally long and multiple wave arrivals can be difficult to distinguish from each other. In this research, a method of damping transducers in reception is demonstrated using a flexural ultrasonic transducer (FUT). This narrowband transducer can operate effectively as a transmitter or receiver of ultrasound, and due to its use in automotive applications, is the most common ultrasonic transducer in existence. An existing mathematical analog for the transducers is used to guide the design of an engineered pressure wave to actively damp the receiving FUT. Experimental measurements on transducers show that ultrasonic receiver resonant ringing can be reduced by 80%, without significantly compromising sensitivity and only by using a suitable driving voltage waveform on the generating transducer.