Thermoelastic imaging using optical interferometer : sensitivity optimization and super-resolution

B. Cretin; O. Franquet; E. Farnault; D. Hauden; J.L. Lesne

doi:doi:10.1051/jp4:1994702

Issue		J. Phys. IV France Volume 04, Number C7, Juillet 1994 8th International Topical Meeting on Photoacoustic and Photothermal Phenomena 8 ITMP³ / 8éme conférence internationale de photoacoustique et photothermique


Page(s)		C7-7 - C7-10
DOI		https://doi.org/10.1051/jp4:1994702

8th International Topical Meeting on Photoacoustic and Photothermal Phenomena
8 ITMP³ / 8éme conférence internationale de photoacoustique et photothermique

J. Phys. IV France 04 (1994) C7-7-C7-10
DOI: 10.1051/jp4:1994702

Thermoelastic imaging using optical interferometer : sensitivity optimization and super-resolution

B. Cretin¹, O. Franquet¹, E. Farnault¹, D. Hauden¹ and J.L. Lesne²

¹ Laboratoire de Physique et Métrologie des Oscillateurs du CNRS, associé à l'Université de Franche-Comté-Besançon, 32 avenue de l'Observatoire, 25044 Besançon cedex, France
² Electricité de France, Direction des Etudes et Recherches, 25 allée Privée, Carrefour Pleyel, 93206 Saint-Denis, France

Abstract
The noncontacting thermoelastic microscope is based on Ar⁺ laser excitation and optical probe detection. The main problem is to adjust the experimental parameters for sensitivity optimisation. This paper points out that 3-D model predicts the sample thermoelastic behaviour. Calculated criteria enable the choice of the best values of parameters. Experimental results show the advantage of an imaging criterion : particularly contrast of metallic sample images is related to the relative position of excitation and detection beams.