超声波密闭容器液位传感器设计

摘要

In view of problem that existing ultrasonic liquid level detection methods need to open door of container in process of installing,so as to damage the container structure and affect sound wave because of volatile medium,a non-contact ultrasonic liquid level sensor was designed.Selection of ultrasonic frequency of the sensor was analyzed,and hardware circuit implementation scheme of the sensor was also given.According to principle of ultrasonic liquid level detection,the sensor takes AT89S52 as core control chip,uses ultrasonic transducer with transceiver and selects nRF2401 as wireless transceiver module to realize level measurement and data transmission of sealed container.The test results show that the sensor has high precision and relative error is within 3％,which meets needs of real-time measurement of local level.%针对现有超声波液位检测方法存在安装时需对容器开孔,从而破坏容器结构和声波受挥发性介质影响的问题,设计了一种非接触式超声波液位传感器,分析了传感器超声波频率的选取并给出了具体硬件电路的实现方案.该传感器根据超声波液位检测原理,以AT89S52为控制核心,采用收发一体超声波换能器,选取nRF2401作为无线收发模块,实现了密闭容器内液位数据的测量与无线传输.测试结果表明,该传感器测试精度较高,相对误差在3％以内,满足了现场液位实时测量的需要.