Video recording showing ultrasonic powering of a fracture monitor demonstrator prototype

The video shows ultrasonic powering of a fracture monitor demonstrator.In the video, the experimental setup is shown. At the start, the function generator, connected to the RF amplifer are shown. They generate the driving signal to the transmitting transducer (cylinder in the water tank). The demonstrator (gray box in front of the transmitting transducer) is ultrasonically powered and connects via Bluetooth to a smartphone app. The ultrasonic receiver are pre-charged collapse-mode CMUTs. The experiment is performed in a tank filled with de-ionised water. The data measured by the strain gauge (at the bottom of the demonstrator housing) is processed and transmitted via Bluetooth. In the video, a piece is removed from the demonstrator: it is a switch to enable the Bluetooth communication. The application shows the data collected by the strain gauge, when vibrations are created in its structure by tapping on the table of the experimental setup.

本视频展示了骨折监测演示装置的超声供电过程。视频中呈现了整套实验装置。实验初始阶段，画面展示了与射频放大器（RF amplifier）相连的函数信号发生器（function generator），二者协同生成驱动信号，输送至水槽内的圆柱形发射换能器（transmitting transducer）。位于发射换能器前方的灰色盒状演示装置通过超声获取电能，并通过蓝牙（Bluetooth）与智能手机应用建立连接。本实验所用的超声接收器（ultrasonic receiver）为预充电崩溃模式电容式微加工超声换能器（pre-charged collapse-mode CMUTs），整套实验在盛有去离子水的水槽中开展。安装于演示装置外壳底部的应变片（strain gauge）所采集的数据，经处理后通过蓝牙传输。视频中还展示了从演示装置上取下的一个部件：该部件为用于启用蓝牙通信的开关。当敲击实验台使演示装置结构产生振动时，智能手机应用会实时显示应变片采集到的振动数据。