Single pulse laser excitation of structural vibration using power densities below the surface ablation threshold
Single pulse laser excitation of structural vibration using power densities below the surface ablation threshold
复制标题
使用低于表面烧蚀阈值的功率密度单脉冲激光激发结构振动
DOI：
10.1006/jsvi.1995.0406
复制
发表时间：
1995
影响因子：
4.7
通讯作者：
N. D. Perry
中科院分区：
文献类型：
--
作者：
W. Philp;D. Booth;N. D. Perry
本文描述了用600μs的Nd：glass激光脉冲（能量在1 J ~ 40 J之间）亚烧蚀光激发悬臂梁和悬挂式车轮轮缘的弯曲振动。的激发是一致的光热生产的局部热弹性弯曲的时刻在该网站的激光照射。这种激励方法已与光纤传感和产生的振动的模态分析相结合，以提供一种实用的方法，远程测量的结构特性依赖于振动的频率。给出了槽损伤悬臂梁的模态频率，以证明这种非接触测量技术在无损检测中的可能应用。
Abstract This paper describes sub-ablation optical excitation of flexural vibration in cantilevers and a suspended truck-wheel rim by using a single 600μs, Nd:glass laser pulse with energies between 1J and 40J. The excitation is consistent with the photothermal production of a localized thermoelastic bending moment at the site of the laser irradiation. This method of excitation has been combined with fibre optic sensing and modal analysis of the resulting vibrations to provide a practical method of remotely measuring the structural properties upon which the frequencies of vibration depend. The modal frequencies of slot-damaged cantilevers are presented to demonstrate the possible application of this non-contact measurement technique for non-destructive testing.