一种基于超声测距技术的超声液位仪设计

为了在工业生产中可以快速、精确地对密闭容器中的液体进行液位检测,设计了一种基于超声测距技术的超声液位仪,针对密闭条件下的液体液位进行精确检测。系统采用数字信号处理(DSP)控制电路,搭建了低噪声、大动态范围的检测电路,完成了适用密闭容器中液体液位的超声传感器选型。实验用超声探头频率为3.0MHz,密闭容器的壁厚为4mm,液位每变化10cm测量一次,用100cm范围内检测数据与标准液位变化值作对比。实验结果显示:同一液位上多次检测求平均值得到的检测数据与标准值的相对误差小于0.5%,所以,本系统满足在0.2~1m范围内,密闭容器中液位测量精度高于1mm的设计要求。

Design of an ultrasonic liquid level meter based on ultrasonic ranging technology

In order to quickly and accurately detect liquid level in sealed container in industrial production, design an ultrasonic liquid level meter based on uhrasonic ranging technology, to accurately detect liquid level in airtight conditions. The system adopts digital signal processing （DSP）control circuit, build low-noise, detecting circuit of wide dynamic range, and complete ultrasonic liquid level sensor selection for sealed container, Experiment uses ultrasonic probe frequency is 3.0 MHz, and wall thickness of sealed container is 4 ram. Changes in level are measured once every 10 era,test data at 100 cm range and standard level change values for comparison. Experimental results show that relative error of detecting data obtained by averaging the value of multiple tests on the same liquid level with standard value is less than 0.5 %, so, the system meets design requirements of liquid level measurement precision is higher than 1ram at range of 0.2 - 1 m in sealed container.