【摘要】 介绍了超声波密度传感器的工作原理和超声波探头的选择与制作工艺要点。所设计的硬件电路包括发射电路、放大接收电路和检波整形电路。超声波传播时间的测量是通过ATMEGA16L单片机内部的高速计数器实现的。针对环境温度对密度的测量有较大的影响,采用集成温度传感器AD590与单片机共同完成温度补偿。经测试证明:传感器的准确度达到±0.25%。更多还原

【Abstract】 The operation principle of the ultrasonic density sensor,the selection,making technology of the ultrasonic probe are introduced.The hardware circuit includes emmitting circuit,amplifying receiving circuit and detection plastic circuit.The time measurement is realized by the inside counter of ATMEGA16L one chip computer.Aimed at effect of the surrounding temperature on the density measurement,the temperature compensation is finished by the cooperation with the integrated temperature sensor AD590 and the one chip computer.Through the test,the accuracy of the sensor can reach ±0.25%.更多还原