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把两个电声换能器安装在静力取样器箱体底部,配合相应电路,测量声脉冲通过箱体内沉积物的传播时间和相对接收幅度,使之在取样同时获得沉积物声速和声衰减剖面,用一个压电陶瓷换能器与沉积物柱状样接触,自上而下测量谐振时电激励阻抗,观察沉积物声阻抗。结果表明,实验室与现场测得的声速、声衰减系数和声阻抗与沉积类型密切相关。 文中讨论了现场测量沉积物声阻抗的可能性。
The two electro-acoustic transducers are installed at the bottom of the static sampler box, and corresponding circuits are used to measure the propagation time and relative receiving amplitude of the acoustic pulse through the sediment in the box so as to obtain the sediment sound velocity and sound attenuation Section, with a piezoelectric ceramic transducer and column sediment-like contact, measured from top to bottom resonant impedance electrical excitation, observed acoustic impedance of sediment. The results show that the sound velocity, acoustic attenuation coefficient and acoustic impedance measured by laboratory and field are closely related to the type of sediment. The article discusses the possibility of measuring the acoustic impedance of sediments in the field.