利用超声导波的形势，测量骨头的厚度，从而判断骨头是否患有骨质疏松症-ultrasonic guided wave measurement in bone

超声波测距仪的设计和制作视频教程,讲解超声测距原理和超声波测距仪的设计和制作。-Ultrasonic range finder design and production of video tutorials to explain the design and production of ultrasonic distance measurement principle and the ultrasonic range finder.