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Proceedings Paper

Modelling of an active burst illumination imaging system
Author(s): Nicolas Rivière; Laurent Hespel; Marie-Thérèse Velluet; Yves-Michel Frédéric; Philippe Barillot; Franck Hélias
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Paper Abstract

Onera, The French Aerospace Lab, has developed a new active burst illumination imaging system with a short time gating. This imaging device is used to obtain a passive or an active image of a small volume of the illuminated scene. To better understand and evaluate the relevant physical phenomena (scintillation, speckle...) impacting on the performance on burst illumination imaging system, Onera has implemented a code (PIAF). The aim of this paper is to describe the model and to present some first results. Efforts have done on three principal points, the laser source model, the propagation through the turbulence concerning the illumination of the scene, and the interaction with the target. The model can take into account any laser sources. To evaluate the propagation through the atmosphere, electromagnetic models are implemented but we specially focused our attention on simplified methods to reduce computing time. Considering the 3D target and its elementary plane surfaces, we analyze each contribution like the incoherent solar field or the incident laser field. We adapt classical and physical models for light reflection. Speckle contributions are also treated using data bases generated by an Onera tool. In the last section of this paper, we attempt to model artefacts associated with such imaging devices, including photon noise, gain issues and electronic noise. We also present experimental results and comparisons with Piaf simulations in an associated paper.

Paper Details

Date Published: 28 August 2009
PDF: 10 pages
Proc. SPIE 7382, International Symposium on Photoelectronic Detection and Imaging 2009: Laser Sensing and Imaging, 73822S (28 August 2009); doi: 10.1117/12.836829
Show Author Affiliations
Nicolas Rivière, ONERA (France)
Laurent Hespel, ONERA (France)
Marie-Thérèse Velluet, ONERA (France)
Yves-Michel Frédéric, ONERA (France)
Philippe Barillot, ONERA (France)
Franck Hélias, ONERA (France)

Published in SPIE Proceedings Vol. 7382:
International Symposium on Photoelectronic Detection and Imaging 2009: Laser Sensing and Imaging
Farzin Amzajerdian; Chun-qing Gao; Tian-yu Xie, Editor(s)

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