Reducing ring-down time of pMUTs with phase shift of driving waveform
Reducing ring-down time of pMUTs with phase shift of driving waveform
复制标题
通过驱动波形相移减少 pMUT 的衰荡时间
DOI：
10.1016/j.sna.2018.08.039
复制
发表时间：
2018-10-01
影响因子：
4.6
通讯作者：
Xie, Jin
中科院分区：
文献类型：
--
作者：
Liu, Xinxin;Chen, Xuying;Xie, Jin
本文提出了一种通过相移来减少压电微机械超声换能器 (pMUT) 振铃时间的方法。所提出的驱动形式可以有效提高有效发射时间与发射时间（Tx时间）的比值，减少衰荡时间，有助于缩短脉冲回波超声波测距的盲区。相移方法有效地将pMUT的衰荡振动快速抑制在空气中20 nm以内和水中15 nm以内。因此，在空气中，衰荡时间可节省 45.9（相当于 206μs），在水中可节省 78.9（相当于 130.1μs）。抑制振铃可以锐化回声包络，以实现更好的定位应用。根据 pMUT 的时间常数检测精确的振动停止时间对于高精度测量非常有用。 (C) 2018 Elsevier B.V. 保留所有权利。
This paper proposes a method to reduce ring-down time for piezoelectric micromachined ultrasonic transducers (pMUTs) through phase shift. The proposed driving form can effectively improve the effective emission time to transmitting time (Tx time) ratio and decrease the ring-down time, which contributes to shorten the blind area in pulse-echo ultrasonic distance measurement. The phase shift method effectively restrains the pMUTs ring-down vibration within 20 nm in air and 15 nm in water swiftly. Consequently, the ring-down time can be saved from 45.9 similar to 206 mu s in air and 78.9 similar to 130.1 mu s in water respectively. The suppressed ring-down can sharpen the echo envelop for better location applications. Detection of the precise vibration stop time based on time constant of pMUTs is useful for measurement with high accuracy. (C) 2018 Elsevier B.V. All rights reserved.