COMBINED THERMOGRAPHY AND NONCONTACT ULTRASOUND INSPECTION TECHNIQUES USING PULSED LASER EXCITATION

被引：3
作者：
Burrows, S. E. [1 ]
Dixon, S. [1 ]
Li, T. [2 ]
Almond, D. [2 ]
机构：
[1] Univ Warwick, Dept Phys, Coventry CV4 7AL, W Midlands, England
[2] Univ Bath, Mat Res Ctr, Bath BA2 7AY, Avon, England
来源：
REVIEW OF PROGRESS IN QUANTITATIVE NONDESTRUCTIVE EVALUATION, VOLS 29A AND 29B | 2010年 / 1211卷
基金：
英国工程与自然科学研究理事会;
关键词：
Laser Ultrasound; Thermography; Finite Element Modelling; RAYLEIGH-WAVES; GENERATION; SURFACE; CRACKS; LAMB;
D O I：
10.1063/1.3362437
中图分类号：
V [航空、航天];
学科分类号：
08 ; 0825 ;
摘要：
A combined ultrasound and thermography system has been developed for identifying surface breaking defects using a raster scanned, Q-switched, pulsed Nd:YAG laser as both a thermal and an ultrasonic source. As the thermal spot approaches a defect, the lateral flow of heat in the substrate surface is disturbed, altering the spot shape. Ultrasound waves are also disturbed; by measuring the change in signal strength and frequency distribution of the received waveform, information regarding the position and depth of the crack can be obtained. Modelling of the interaction between Lamb waves and defects has been compared with experimental data.
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页码：510 / +
页数：2
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