【摘要】 根据定量超声波检测原理,阐述了一种针对超声波发射信号和回波信号的高速采集系统。来自超声探头的信号通过前端的调理电路,在采样控制电路作用下,接受采样。所采数据在由CPLD芯片所设计的控制电路控制下,通过FI- FO缓存以及带USB2．0接口的单片机芯片,被传输至计算机。根据相关公式,只需计算出超声波发射信号和回波信号的时间差,即可获得定量超声波在受试者胫骨的皮质骨中传播速度。与定量超声波在正常胫骨中的传播速度相比较,可以为骨质疏松症提供便捷的诊断手段。更多还原

【Abstract】 According to the principle of ultrasound detection, this thesis describes a high -speed sampling system for ultrasound emergent wave and echo wave. After passing the adjusting circuit, signals from ultrasound detector are sampled in the sample-controlling circuit. By the utilization of CPLD chip, all the data sampled are transmitted into computer through FIFO registers and single-chip microcomputer with USB2.0 interface. The propagation velocity of ultrasound in patient’s shinbone can be achieved by figuring out the time span between emergent wave and echo wave. By comparing with the velocity in normal person’s shinbone, osteoporosis can be diagnosed conveniently.更多还原