基于脉冲宽度调制技术的超声波测风系统研究

Ultrasonic Anemometer System Based on PWM Techniques

给出了时差法超声波测风系统的总体设计,分析了几种改善超声波信号到达时刻的方法。重点提出了一种基于脉冲宽度调制技术(PWM)的超声波驱动信号的具体实现方法。同时对采用和不采用调制技术两种方案进行了详细的对比分析,结果表明采用调制技术的驱动脉冲更有利于正确判决超声波回波信号的到达时刻。所设计的超声波脉冲驱动方案对基于时差法的超声波风速仪具有重要的参考价值。

The ultrasonic anemometer system design based on time-difference-method was presented,and the ways to improve the arriving time of ultrasonic signals were analyzed and that to achieve ultrasonic driving signal basing upon pulse width modulation(PWM) proposed.Having the schemes with or without modulation techniques compared shows that the driving pulse with modulation techniques can greatly benefit the right judgment of the arriving time of the ultrasonic echo signal,the designed ultrasonic pulse driving scheme provides the good reference for the ultrasonic anemometer based on time-difference-method.