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Temporal scattering of dense scattering media under ultra short laser light illumination: Application for particle sizing

DOI: 10.1615/ICHMT.2007.ConfElectromagLigScat.170
pages 57-60

Laurent Hespel
Onera, The French Aerospace Lab, Theoretical and Applied Optics Department Light Interaction with Matter, Imaging and Detection Laser Systems Unit, 2 avenue Edouard Belin, BP4025, 31055 Toulouse cedex 4, France

Marie Barthelemy
Onera, The French Aerospace Lab, Theoretical and Applied Optics Department Light Interaction with Matter, Imaging and Detection Laser Systems Unit, 2 avenue Edouard Belin, BP4025, 31055 Toulouse cedex 4, France

Nicolas Riviere
Onera, The French Aerospace Lab, Theoretical and Applied Optics Department Light Interaction with Matter, Imaging and Detection Laser Systems Unit, 2 avenue Edouard Belin, BP4025, 31055 Toulouse cedex 4, France

Andre Delfour
Onera, The French Aerospace Lab, Theoretical and Applied Optics Department Light Interaction with Matter, Imaging and Detection Laser Systems Unit, 2 avenue Edouard Belin, BP4025, 31055 Toulouse cedex 4, France

Loic Mees
CORIA, Universite de Rouen, Site Universitaire du Madrillet BP 12 76801 Saint Etienne du Rouvray, France

Gerard Grehan
CORIA, Universite de Rouen, Site Universitaire du Madrillet BP 12 76801 Saint Etienne du Rouvray, France

Аннотация

We intend to demonstrate the contribution of ultra short laser light methods for improving the particle sizing of dense scattering medium like plumes or engine sprays. We especially focus our attention on the time-resolved propagation of ultra short laser pulses in the forward and backward directions considering a Monte-Carlo (MC) scheme. We investigate the influence of the detector-source configurations on the retrieval of spectral backscattering and extinction coefficients derived from the measurements of the spectral transmittance and backscattering power. An efficient method developed to retrieve Particle Size Distribution of aerosols from multi-spectral LIDAR returns is then adapted to the investigated case. This method is finally tested on the numerical spectral backscattering and extinction coefficients derived from MC simulations.

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