| Numéro |
J. Phys. IV France
Volume 04, Numéro C7, Juillet 1994
8th International Topical Meeting on Photoacoustic and Photothermal Phenomena8 ITMP3 / 8éme conférence internationale de photoacoustique et photothermique |
|
|---|---|---|
| Page(s) | C7-55 - C7-58 | |
| DOI | https://doi.org/10.1051/jp4:1994714 | |
8th International Topical Meeting on Photoacoustic and Photothermal Phenomena
8 ITMP3 / 8éme conférence internationale de photoacoustique et photothermique
J. Phys. IV France 04 (1994) C7-55-C7-58
DOI: 10.1051/jp4:1994714
Fraunhofer-Institute for Nondestructive Testing (IzfP), University, Bldg. 37, 66123 Saarbrücken, Germany
© EDP Sciences 1994
8 ITMP3 / 8éme conférence internationale de photoacoustique et photothermique
J. Phys. IV France 04 (1994) C7-55-C7-58
DOI: 10.1051/jp4:1994714
Non-linearity in photothermal radiometric imaging
U. NetzelmannFraunhofer-Institute for Nondestructive Testing (IzfP), University, Bldg. 37, 66123 Saarbrücken, Germany
Abstract
Non-linear effects occurring in photothermal microscopes based on principle of photothermal radiometry are studied as a function of the laser power and of the modulation frequency. For stainless steel, a second harmonic component of up to 11 % of the fundamental amplitude is found. Phase shifts of up to 20 degrees are observed as a function of the modulation frequency. The nonlinearity is mainly due to Stefan-Boltzmann's law. The experimental results are in good agreement with a theoretical model based on the static and oscillating temperature distribution.
© EDP Sciences 1994