基于超声回波能量的液位测量系统的设计

Design of Liquid Level Measurement System Based on Ultrasonic Echo Energy

设计了一种基于超声回波能量的液位测量系统。该系统通过比较超声波在不同介质中传播时回波能量的不同,实现液位的测量。采用三个大小相同,声学属性一致的圆形压电晶片组成超声波测量探头;采用模块化的方法设计了系统硬件电路;利用峰值检波原理对回波信号进行了线性检波处理。实验结果表明,该系统能够有效地检测出密闭容器内的液体界位,测量误差小于3 mm。

A liquid level measurement system based on ultrasonic echo energy was designed.The system realized the measurement of liquid level by comparing the echo energy when ultrasonic wave travels in different media.The ultrasonic measuring probe comprised of three circular piezoelectric wafers with the same size and acoustic property was used.The hardware circuit of the system was designed with modularization method.The principle of peak detection was used to linearly detect the echo signal.The experimental results showed that the system could effectively detect the liquid boundary in the sealed container,with the measurement error less than 3 mm.