A transient grating method is used to excite and monitor Lamb acoustic waveguide modes in free standing thin polyimide films which are known to have transverse isotropic symmetry. The dispersion of these Lamb modes is used to accurately characterize both the in and out-of-plane elastic moduli in the films. To our knowledge, this is the first example of the noncontact, nondestructive determination of transverse isotropic moduli in a thin film system.
|Original language||English (US)|
|Journal||Journal De Physique. IV : JP|
|State||Published - 1994|
|Event||Proceedings of the 8th International Topical Meeting on Photoacoustic and Photothermal Phenomena - Guadeloupe, Fr|
Duration: Jan 22 1994 → Jan 25 1994
ASJC Scopus subject areas
- Physics and Astronomy(all)