Non-contact estimation of thickness and elastic properties of metallic foils by the wavelet transform of laser-generated Lamb waves

被引：71

作者：

Hayashi, Y

Ogawa, S

Cho, H

Takemoto, M

机构：

[1] Shizuoka Univ, Fac Engn, Hamamatsu, Shizuoka 432, Japan

[2] Aoyama Gakuin Univ, Fac Sci & Engn, Tokyo 157, Japan

来源：

NDT & E INTERNATIONAL | 1999年 / 32卷 / 01期

关键词：

laser-generated Lamb waves; wavelet transform; non-contact estimation;

D O I：

10.1016/S0963-8695(98)00029-2

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Non-contact estimation of the thickness and elastic properties of metallic foils was attempted by quantitative analysis of velocity dispersion of laser-generated Lamb waves. Lamb waves were generated in stainless steel (AISI304) foils with a thickness of less than 40 mu m by a Q-switched Nd:YAG laser. Both the zeroth order symmetric S-0 and anti-symmetric A(0) waves were monitored using a heterodyne-type laser interferometer. Dispersion of group velocity of the A(0) mode was obtained by the wavelet transformation, and was found to agree well with the numerical solution of the Rayleigh-Lamb equation. A modified method to estimate both the thickness and acoustic (or elastic) properties from the sheet wave velocity and the group Velocity dispersion of the A(0) mode was proposed. The modified method was found to provide a correct estimate for stainless steel foils thinner than 30 mu m. (C) 1998 Elsevier Science Ltd. All rights reserved.

引用

页码：21 / 27

页数：7

共 12 条

[1]

CHO H, 1994, J MAT SCI SOC JPN, V31, P304

[2]

Chui C.K., 1992, An introduction to wavelets, V1, DOI DOI 10.1109/99.388960

[3] ESTIMATION OF THE THICKNESS OF THIN METAL SHEET USING LASER GENERATED ULTRASOUND [J].