加热式差分热电阻水位传感器动态特性仿真

Dynamic Characteristics Simulation of Heated Differential Thermal Resistance Water Level Sensor

由于液位变化、传热方式以及环境温度等因素,加热式差分热电阻水位传感器的动态特性不稳定,为此对其展开仿真分析。在分析传感器测量原理基础上,模拟传感器热时间常数响应下传感器输出响应,确认动态性能影响因素。仿真结果表明,测试环境温度越高,水位传感器的温度动态特性的变化越平缓,反之则曲线越陡峭;水位逐渐上升时的响应时间仅需要几秒,当水位开始下降时,响应时间较长;经所提方法优化调节传感器温度动态特性后,水位测量值最大误差仅为-0.08 cm,测量相对误差的平均值为0.03 cm,有效提高了传感器的准确性。

Due to factors such as liquid level changes,heat transfer methods,and ambient temperature,the dynamic characteristics of the heating differential resistance water level sensor are unstable.Therefore,simulation analysis is carried out on it.Based on the analysis of the sensor measurement principle,the sensor output response under the thermal time constant response of the sensor is simulated to confirm the influencing factors of dynamic performance.The simulation results show that the higher the test ambient temperature,the more gentle the change of the temperature dynamic characteristics of the water level sensor,on the contray,the steeper the curve will be.When the water level gradually rises,the response time only needs a few seconds,when the water level starts to decline,the response time is longer,after optimizing and adjusting the temperature dynamic characteristics of the sensor by the proposed method,the maximum error of water level measurement is only-0.08 cm,and the average relative error of measurement is 0.03 cm,which effectively improves the accuracy of the sensor.