A Novel Transfer Function Based Ring-Down Suppression System for PMUTs.

Zhipeng Wu,Songsong Zhang,Guoqiang Wu,Zhihao Tong,Liang Lou,Yuandong Gu,Alexander Tovstopyat,Wenjuan Liu,Chengliang Sun

doi:10.3390/s21196414

Abstract

In this paper, a novel ring-down suppression system based on transfer function is proposed for the first time to suppress the ring-down time and decrease the blind area of PMUTs (Piezoelectric Micromachined Ultrasonic Transducers). This suppression system includes a transfer function and a simple P (proportion) controller, which can reduce the ring-down time without degrading any performances of PMUTs. The transfer function serves as a virtual PMUT device, feeding its output into the P controller; then, the P controller generates a suppression signal to the actual PMUT device. The ring-down time of a 115-kHz PMUT array is demonstrated to be reduced by up to 93% through the suppression system. In addition, the P controller has been experimentally optimized, reducing the blind area of the PMUT array by about 40%. Moreover, a low ring-down PMUTs system design guideline is established, which is practical and straightforward for industrial scenarios. Finally, the system can be easily integrated into ASIC (Application Specific Integrated Circuit).

Highlights

Ultrasonic transducers have been widely used for rangefinders, especially at short (
The transfer function serves as a virtual PMUT device, feeding its output into the P controller; the P controller will generate a suppression signal to the actual PMUT device
A novel suppression system based on the transfer function of PMUTs is proposed to reduce the blind area of the PMUT array