Table of Contents
ISRN Mechanical Engineering
Volume 2014, Article ID 349020, 7 pages
http://dx.doi.org/10.1155/2014/349020
Research Article

Travel-Time Difference Extracting in Experimental Study of Rayleigh Wave Acoustoelastic Effect

School of Mechatronic Engineering, China University of Mining and Technology, Xuzhou, Jiangsu 221116, China

Received 25 January 2014; Accepted 6 March 2014; Published 17 March 2014

Academic Editors: A. Gelfgat and Y.-H. Lin

Copyright © 2014 Hu Eryi and Ying Shao. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

In order to identify the travel-time difference accurately in the experimental study of Rayleigh wave acoustoelastic effect, an experimental system is constructed by the ultrasonic pulser-receiver, digital oscilloscope, Rayleigh wave transmitter and receiver, and a personal computer. And then, the digital correlation method and the Fourier transform frequency analysis method are used to obtain the travel-time difference of the Rayleigh wave corresponding to different subsurface stress conditions. Furthermore, the simulated ultrasonic signals are used to verify the reliability of the two kinds of ultrasonic signal information extracting algorithms, respectively. Finally, the proposed signal processing methods are applied to extract the time delay between different Rayleigh wave signals corresponding to different subsurface stress level.