Detection of Leaky-rayleigh Wa Yes at Air-solid Interfaces by Laser Interferometry
نویسندگان
چکیده
Leaky-Rayleigh waves have been studied extensively at liquid-solid interface in the last 30 years [1-4]. Both leaky-Rayleigh and leaky-Lamb waves have found many application in Nondestructive Evaluation, e.g. surface defect characterization, etc [5,6]. Because of the difficulties associated with ultrasonic wave generation and detection in air in the megaHerz region air coupled non destructive evaluation has only recently been explored [7,8].
منابع مشابه
Numerical simulation and experimental detection of leaky Lamb waves induced by pulse laser at air-solid interfaces
Based on the thermoelastic mechanism of laser ultrasonic, the problems of the thermal conduction and the coupling between the motion of solid and fluid are solved by using the finite element method. And then the transient waveforms of leaky Lamb waves induced by pulse laser action on the air-aluminum interface are obtained. Experimental signals of laser-induced leaky Lamb waves at the air-alumi...
متن کاملLeaky Rayleigh and Scholte waves at the fluid–solid interface subjected to transient point loading
The analysis of acoustic waves generated by a transient normal point load applied on a fluid–solid interface is presented. The closed-form exact solution of the wave motion is obtained by using integral transform techniques. The obtained analytical solution provides necessary theoretical background for optimization of fluid-coupled ultrasonic and acoustic wave detection in experiments. Numerica...
متن کاملFrequency Noise Properties of Lasers for Interferometry in Nanometrology
In this contribution we focus on laser frequency noise properties and their influence on the interferometric displacement measurements. A setup for measurement of laser frequency noise is proposed and tested together with simultaneous measurement of fluctuations in displacement in the Michelson interferometer. Several laser sources, including traditional He-Ne and solid-state lasers, and their ...
متن کاملThe influence of Beam Type on the Back Reflection of Ultrasonic Beams from a Liquid-Solid Interface
Is. ,•l•i, "B•k reflection ofultrasonic waves obliquely incident to a solid surface in water," Ipn. I. Appl. Phys. 2, 198 (1963). 20. l. Diachok and W. G. Mayer, "Conical reflection of ultrasound from a liquid-solid interface," J. Acoust. Soc. Am. 47, 1:55-157 (1970). 3W. G. Neubauer, in Elastic Wave Scattering and Propagation, edited by V. K. Varadan and V. V. Varadan (Ann Arbor Science, Ann A...
متن کاملThe Influence of Thin Bonding Layers on the Leaky Waves at Liquid-Solid Interfaces
This paper presents theoretical and experimental results on the problem of bounded acoustic beam reflection at the Rayleigh angle from a fluid-solid interface which is loaded by a thin solid layer. The theoretical development exploits the framework of existing theory to yield a simple, analytic model which is reasonably accurate for thin layers. It is shown that the influence of the layer is co...
متن کامل