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

来源：

OPTICS LETTERS | 2011年 / 36卷 / 17期

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

页码：3449 / 3451

页数：3