Perton M, Audoin B, Pan Y D, Rossignol C
Laboratoire de Mécanique Physique, UMR CNRS 8469, Université Bordeaux 1, 33405 Talence, France.
Ultrasonics. 2006 Dec 22;44 Suppl 1:e859-62. doi: 10.1016/j.ultras.2006.05.184. Epub 2006 Jun 9.
A point source-point receiver technique, based on laser generation and laser detection of acoustic waves, allows determination of mechanical properties of an anisotropic cylinder. The nature of the material and the geometry of the sample give a dispersive behaviour to the diffracted waves and make the acoustic signature difficult to interpret. To overpass the intricacies, wave fronts (conical waves in the volume and helical waves on the surface) are synthesized from signals provided by scanning the primitive line of the cylinder with a laser point source. In order to distinguish between direct bulk conical waves and other contributions in the acoustic response, some considerations on line surface waves and on reflected bulk conical waves are supplied. The identification of the stiffness tensor components, based on the inversion of the bulk waves phase velocities, is applied to signals simulated for a composite material.
一种基于声波的激光产生和激光检测的点源 - 点接收器技术，可用于确定各向异性圆柱体的力学性能。材料的性质和样品的几何形状使衍射波呈现色散行为，导致声学特征难以解释。为了克服这些复杂性，通过用激光点源扫描圆柱体的原始线所提供的信号来合成波前（体积中的锥形波和表面上的螺旋波）。为了区分直接体锥形波和声学响应中的其他成分，对线面波和反射体锥形波进行了一些考虑。基于体波相速度反演的刚度张量分量识别方法应用于复合材料的模拟信号。
