基于FFT算法的超声波泥沙测量

The Ultrasonic Sediment Measurement Based on FFT Algorithm

采用数字手段测取了超声波信号的衰减系数,通过衰减系数可得出含沙量。数字信号处理技术首先必须将回波信号的平均频率参数离散化。在计算的过程中,一般采用DFT处理技术,但直接用DFT进行谱分析和信号实时处理又不切实际,所以使用了时间抽取的优化实数FFT算法,该算法在保持直接FFT算法速度的前提下减少了程序量。

By using the digital means, the attenuation coefficient of the ultrasonic signal is measured, through which the sediment content can be obtained. In order to use the digital signal processing technique, the mean frequency parameters of the echo signal must be discretized. In the Calculation, the DFT processing technique is generally adopted, however the direct use of the DFT technique in the spectrochemical analysis and the signal real-time processing doesn＇t suit the actual conditions, so the time-extracted FFT algorithm with the optimized real number is applied, by using .which the program amount is reduced under the precondition of holding the speed of the FFF algorithm.