All-optical probing of the nonlinear acoustics of a crack

被引:28
作者
Mezil, Sylvain [1 ]
Chigarev, Nikolay [1 ]
Tournat, Vincent [1 ]
Gusev, Vitalyi [2 ]
机构
[1] Univ Maine, PRES UNAM, LAUM, UMR CNRS 6613, F-72085 Le Mans, France
[2] Univ Maine, PRES UNAM, LPEC, UMR CNRS 6087, F-72085 Le Mans, France
关键词
MODULATION; WAVES;
D O I
10.1364/OL.36.003449
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
Experiments with an all-optical method for the study of the nonlinear acoustics of cracks in solids are reported. Nonlinear acoustic waves are initiated by the absorption of radiation from a pair of laser beams intensity modulated at two different frequencies. The detection of acoustic waves at mixed frequencies, absent in the frequency spectrum of the heating lasers, by optical interferometry or deflectometry provides unambiguous evidence of the elastic nonlinearity of the crack. The high contrast in crack imaging achieved by remote optical monitoring of the nonlinear acoustic processes is due to the strong dependence of the efficiency of optoacoustic conversion on the state of the crack. The highest acoustic nonlinearity is observed in the transitional state of the crack, which is intermediate between the open and the closed ones. (C) 2011 Optical Society of America
引用
收藏
页码:3449 / 3451
页数:3
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