Mechanical impedance measurement and damage detection using noncontact laser ultrasound

被引：2

作者：

Lee, Hyeonseok ^{[1
]}

Lim, Hyeong Uk ^{[1
]}

Hong, Jung-Wuk ^{[1
]}

Sohn, Hoon ^{[1
]}

机构：

[1] Korea Adv Inst Sci & Technol, Dept Civil & Environm Engn, Taejon 305701, South Korea

来源：

OPTICS LETTERS | 2014年 / 39卷 / 11期

基金：

新加坡国家研究基金会;

关键词：

VIBROMETRY;

D O I：

10.1364/OL.39.003130

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

This Letter proposes a mechanical impedance (MI) measurement technique using noncontact laser ultrasound. The ultrasound is generated by shooting a pulse laser beam onto a target structure, and its response is measured using a laser vibrometer. Once ultrasound propagation converges to structural vibration, MI is formed over the entire structure. Because noncontact lasers are utilized, this technique is applicable in harsh environments, free of electromagnetic interference, and able to perform wide-range scanning. The formation of MI and its feasibility for damage detection are verified through thermo-mechanical finite element analysis and lab-scale experiments. (C) 2014 Optical Society of America

引用

页码：3130 / 3133

页数：4

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