射频信号时间域反射法监测液位

为了动态监测槽罐中液体的液位，利用时间域内射频信号在液体和空气中的响应特性测试液体的液位．在测试过程中通过网络分析仪将射频信号输入到自行设计的测试探针上，测试其S11参数，得到信号在空气和水中的频率响应，并经傅立叶变换至时域内．探针周围介质变化会引起反射信号相应的变化，结合信号在介质中的传播速度确定液体的液位．实验结果表明，射频信号时间域反射法能够精确、动态地监测液体的液位变化．与其它测试方法相比精度高，能实现自动化测试，尤其适合多层液位的测量．

Liquid level measurement by TDR method of RF signal

This paper proposed the method of liquid level measurement by the response of radio frequency signal in the time domain to testing the liquid level in the containers.The S11 parameter of self-designed probe was tested by network analyzer,and the reflectance signals of atmosphere and water in the frequency domain were attained.Through fast Fourier transform,the signals were converted into time domain.By the changes of media around the probe,the reflectance signal changed.This identified the signal propagatio...