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Pump Probe Experiment for Optical Diagnosis of Very Thick Scattering Media

Authors :: Barthelemy, M.
Hespel, L.
Rivière, L.
Chatel, B.
Dartigalongue, T.
ONERA - The French Aerospace Lab [Salon]
ONERA
Institut de Recherche sur les Systèmes Atomiques et Moléculaires Complexes (IRSAMC)
Université Toulouse III - Paul Sabatier (UT3)
Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)
Institut National des Sciences Appliquées - Toulouse (INSA Toulouse)
Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Université Toulouse III - Paul Sabatier (UT3)
Source :: Aerospace Lab, Aerospace Lab, Alain Appriou, 2009, p. 1-6
Publication Year :: 2009
Publisher :: HAL CCSD, 2009.
Abstract: Scattering media with very high optical density are present in a great variety of application: clouds, paints, spray and biological cells. New optical diagnosis tools developments are very important in order to get in situ characterization without disturbing the sample. The goal of this paper is to describe a new method for determining the Particle Size Distribution (PSD) of a very thick scattering medium. This method is based on Optical Density (OD) measurements for different wavelengths, and a numerical inversion algorithm. The experimental challenge is to operate a light source that is both bright enough and tuneable in order to carry out such measurements. In addition, the scattered light has to be filtered. We will demonstrate that femtosecond spectroscopy overcomes all of these difficulties. A numerical inversion algorithm has been implemented in order to determine the PSD from an OD spectrum.<br />Journal Aerospace Lab, Issue 1, December 2009; ISSN: 2107-6596