9-Meter-Long 3d Ultrasonic Objects Detection via Packaged Lithium-Niobate PMUTs

This paper reports a 9-meter-long ultrasonic 3D detector based on a packaged lithium niobate PMUTs (piezoelectric micromachined ultrasonic transducers). Compared with the state-of-the-art reports, three distinctive achievements have been demonstrated: (1) high uniformity and wide bandwidth PMUTs by optimized package designs for highly efficient ultrasonic energy transfer; (2) a long-range receiving beamforming detection scheme on a 4×4 PMUT array for up to 9 m detection rang - comparable to the longest reported range via PMUTs; and (3) 3D detection of multiple static/moving objects with the field of view exceeding 50°. As such, this device is valuable for various applications such as obstacle avoidance when both low power consumption and small form factor are desirable, including aerial drones.

本文报道了一种基于封装铌酸锂压电微机械超声换能器（PMUTs）的9米长超声3D探测器。与最先进的报道相比，展示了三项独特的成果：（1）通过优化封装设计实现了高均匀性和宽带宽的PMUTs，以实现高效的超声能量传递；（2）在一个4×4的PMUT阵列上采用远程接收波束成形检测方案，检测范围可达9米——与通过PMUTs报道的最长范围相当；（3）对多个静态/移动物体进行3D检测，视场超过50°。因此，这种设备在各种应用中都很有价值，例如在需要低功耗和小尺寸的情况下（包括空中无人机）进行避障。