各向异性介质中扭转波分裂的初步实验观测

Experiment observation of torsion wave splitting in anisotropic medium

实验室可以产生两种振动模式的横波,一种是剪切振动,另一种是扭转振动.本文利用扭转换能器观测了扭转横波在各向异性样品中的传播特性.实验表明,无偏振方向的扭转波在各向异性介质中会以两种不同速度传播,并出现波的分裂现象,其快慢波的速度值与剪切横波的快慢横波速度一致.用扭转波换能器接收时,快慢扭转波的波形振幅不受各向异性方位影响,表现为无方向性.通过两块不同来源的均匀各向异性样品,用实验观测方式初步揭示了各向异性介质中扭转波的一些传播特征.

Shear waves of two vibration modes can be produced in laboratories： the shear vibration and the torsion vibration. The propagation characteristics of torsion waves in anisotropic medium are tested using the torsion vibration transducers. Experiment tests indicate that two types of torsion wave with different velocity appear when the torsion wave without polarization characteristic propagates in anisotropic medium, and the velocities are consistent with those of the fast and slow shear wave which are produced when the shear vibration wave is tested. When these two types of torsion wave are received by torsion wave receivers, their amplitudes are not affected by the anisotropic azimuth. uncovered some propagation characteristics Through observation with two homogeneous anisotropic samples, we of the torsion wave in anisotropic medium.