Daniel Guggenheim School of Aerospace Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, USA.
J Acoust Soc Am. 2011 Feb;129(2):585-8. doi: 10.1121/1.3523429.
A single head scanning laser Doppler vibrometer is used for the estimation of the polarization of the first symmetric (S(0)) and antisymmetric (A(0)) Lamb wave modes. The measurements at two known incidence angles are performed in order to resolve the two components of motion. Filtering in the frequency/wavenumber domain of the response recorded along a scan line separates the contributions from each mode and allows the evaluation of the corresponding elliptical trajectories of particle motion. Comparison between measured and analytically estimated trajectories validates the measurement technique and suggests its application for the development of material characterization and diagnostics tools.
采用单头部扫描激光多普勒测振仪估计一阶对称（S(0)）和反对称（A(0)）兰姆波模式的偏振。在两个已知的入射角下进行测量，以解析运动的两个分量。沿扫描线记录的响应在频/波数域进行滤波，分离出每个模式的贡献，并允许评估相应的粒子运动的椭圆轨迹。将测量轨迹与分析估计轨迹进行比较，验证了测量技术，并表明其可用于开发材料特性和诊断工具。
