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针对于回声仪记录的反射声波数据中液面波和接箍波因受噪声等各种干扰而难以辨识的问题,本文提出了通过分析波形频谱,对反射波进行滤波和辨识的方法,重点研究了利用接箍波周期性特点求声速,滤除杂波后频谱分析找到基波的频率以及通过算法利用统计方法分析时差得到两种结果,根据二者误差很小取其平均值得到声速。实际表明,这种方法求得的声速更接近于管内的实际声速,可以得到较为准确的液面深度值。
In order to solve the problem that the surface wave and the coupling wave in the reflected acoustic wave recorded by the echo instrument are difficult to recognize due to various kinds of interference such as noise, this paper presents a method of filtering and identifying the reflected wave by analyzing the spectrum of the waveform. The use of the periodic characteristics of the coupling wave to find the sound velocity, the frequency spectrum to find the fundamental wave after filtering out the clutter, and using the statistical method to analyze the time difference by the algorithm to get two kinds of results. The actual shows that the sound velocity obtained by this method is closer to the actual speed of sound within the tube, you can get a more accurate depth of the liquid value.