Crack detection in riveted lap joints using fiber laser acoustic emission sensors

被引：29

作者：

Cranch, G. A. ^{[1
]}

Johnson, L. ^{[1
]}

Algren, M. ^{[1
]}

Heerschap, S. ^{[1
]}

Miller, G. A. ^{[1
]}

Marunda, T. S., II ^{[2
]}

Holtz, R. L. ^{[1
]}

机构：

[1] Naval Res Lab, 4555 Overlook Ave SW, Washington, DC 20375 USA

[2] Nova Res Inc, Alexandria, VA 22308 USA

来源：

OPTICS EXPRESS | 2017年 / 25卷 / 16期

关键词：

INTENSITY NOISE;

D O I：

10.1364/OE.25.019457

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

Fiber laser ultrasonic sensors are demonstrated to be capable of measuring acoustic emission generated by cracks in aluminum panels. A single laser sensor is integrated into a riveted lap joint, which is subject to accelerated fatigue. Acoustic emission generated by crack formation in the panel in addition to other acoustic events due to fretting within the joint are clearly resolved by the laser sensor. Localization of an acoustic emission event is demonstrated with a multiplexed array of three laser sensors. This manuscript also calculates the fundamental limit to displacement resolution of the fiber laser sensor and presents measurements of the directional response to Lamb waves. The high measurement resolution and multiplexing capability of the fiber laser ultrasonic sensor makes it an ideal candidate for structural health monitoring applications. (C) 2017 Optical Society of America

引用

页码：19457 / 19467

页数：11

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