Remote excitation and sensing of mechanical resonances in structures using laser diodes and an optical fibre interferometer
Remote excitation and sensing of mechanical resonances in structures using laser diodes and an optical fibre interferometer
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使用激光二极管和光纤干涉仪远程激发和感测结构中的机械共振
DOI：
10.1088/0957-0233/5/6/014
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发表时间：
1994
影响因子：
2.4
通讯作者：
D. Booth
中科院分区：
文献类型：
--
作者：
W. Philp;D. Booth
本文报道了用低功率半导体激光器的重复脉冲非接触激发大尺寸结构的共振弯曲振荡。这些振动是由光热引起的弯曲力矩产生的，这些弯曲力矩具有足够的幅度以产生偏转，这些偏转可以使用简单的光纤干涉仪容易地测量。干涉仪使用来自结构的自然表面的反射信号，并且仅要求表面近似垂直于干涉仪光束对准。讨论了这种技术在非接触、非破坏性检测中的应用，以检测尺寸、形状和结构完整性等性能的变化。
The non-contact excitation of resonant flexural oscillations in structures of significant size, using repetitive pulses from a low-power diode laser, is reported. These vibrations are produced by photothermally induced bending moments which are of sufficient amplitude to produce deflections which are readily measured using a simple optical fibre interferometer. The interferometer uses the reflected signal from the natural surface of the structure and requires only that the surface be aligned approximately perpendicular to the interferometer beam. Applications of this technique for non-contact, non-destructive testing for changes in properties such as size, shape and structural integrity are discussed.