Propragation Characteristics of Acoustic Waves Through Different Material Waveguide Rods in Water
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摘要: 由信号发生器产生的声波在水中通过不同材料波导杆时，其传播特性会发生改变，采用全波形声发射仪对其进行了波形数据检测、参数和波形分析，系统研究了声波通过水中不同材料波导杆的传播特性。结果表明：声波信号的幅度计数、振铃计数和能量计数的变化规律均稳定，并易于找出相应的变化规律；声波通过水中不同材料波导杆的时域波形均呈现衰减特征，而振幅频谱均呈现明显的频散现象；声波通过水中金属波导杆的传播特性优于水中塑料波导杆。所得结果为进一步研究地震波经深水井中不同材料波导杆的传播特性和开展地震监测奠定了基础。Abstract: By using full waveform acoustic emission instrument, the waveform data of the acoustic waves produced by a signal generator and through different material waveguide rods in water have been detected and analyzed, and then the propagation characteristics of the acoustic waves have been systemetically studied. The research results show that the change regulation of the acoustic emission amplitude counting, ring down counting and energy counting are stable and it is easy to find the corresponding change rule. The acoustic waves through the different material waveguide rods in water always show the attenuation characteristics, but the time domain waveform and the amplitude spectrum show the obvious frequency dispersion phenomena. The propagation characteristic of the acoustic wave through the metal waveguide rod is much better than that of the plastic one. Therefore, the experimental results are very important for earthquake monitoring by means of the propagation characteristics of the acoustic waves through the appropriate material waveguide rod in a deep well.
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