Dr. Laurent Hespel Profile

Dr. Laurent Hespel

Head of Laser Imaging and Lidar Research Unit at ONERA

SPIE Involvement:

Author

Publications (20)

Proceedings Article | 5 May 2017 Presentation + Paper

2D and 3D flash laser imaging for long-range surveillance in maritime border security: detection and identification for counter UAS applications

L. Hespel, N. Riviere, M. Fraces, P. E. Dupouy, A. Coyac, P. Barillot, S. Fauquex, A. Plyer, M. Tauvy, M. Jacquart, I. Vin, E. Nascimben, C. Perez, J. P. Velayguet, D. Gorce

Proceedings Volume 10191, 1019109 (2017) https://doi.org/10.1117/12.2269141

KEYWORDS: 3D image processing, 3D acquisition, Cameras, Sensors, Laser imaging, Laser development, Imaging systems, LIDAR, 3D modeling, Surveillance

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Proceedings Article | 13 May 2016 Paper

Comparison of simulated and experimental 3D laser images using a GmAPD array: application to long range detection

Antoine Coyac, Nicolas Riviere, Laurent Hespel, Xavier Briottet

Proceedings Volume 9832, 983205 (2016) https://doi.org/10.1117/12.2223603

KEYWORDS: 3D acquisition, 3D image processing, Optical simulations, Laser imaging, Staring arrays, Sensors, Clouds, Copper, Pulsed laser operation, Imaging systems

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Proceedings Article | 13 May 2016 Paper

Performance evaluation of active sub-Terahertz systems in Degraded Visual Environments (DVE)

Romain Ceolato, Bernard Tanguy, Christian Martin, Thierry Huet, Patrick Chervet, Gerard Durand, Nicolas Riviere, Laurent Hespel, Nina Diakonova, Dmitry But, Wojciech Knap, Jerome Meilhan, Baptiste Delplanque, Jonathan Oden, François Simoens

Proceedings Volume 9839, 983906 (2016) https://doi.org/10.1117/12.2223939

KEYWORDS: Driver's vision enhancers, Terahertz radiation, Absorption, Imaging systems, Cameras, Signal attenuation, Visualization, Bolometers, Atmospheric particles, Sensors

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Proceedings Article | 22 October 2015 Paper

Performance assessment of simulated 3D laser images using Geiger-mode avalanche photo-diode: tests on simple synthetic scenarios

Antoine Coyac, Laurent Hespel, Nicolas Riviere, Xavier Briottet

Proceedings Volume 9648, 964805 (2015) https://doi.org/10.1117/12.2194304

KEYWORDS: 3D image processing, Sensors, Signal detection, Optical simulations, 3D acquisition, Laser imaging, Pulsed laser operation, Target detection, Interference (communication), 3D modeling

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Proceedings Article | 9 June 2014 Paper

Mosaïc active imaging: direct physical modeling and image reconstruction

Emmanuelle Thouin, Marie-Thérèse Velluet, Dominique Hamoir, Laurent Hespel, François Malgouyres, Xavier Briottet

Proceedings Volume 9080, 908007 (2014) https://doi.org/10.1117/12.2053022

KEYWORDS: Signal to noise ratio, Imaging systems, Sensors, Cameras, Atmospheric propagation, Image restoration, Turbulence, Laser beam propagation, Reconstruction algorithms, Image processing

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Proceedings Article | 22 October 2013 Paper

Mid-IR DIAL for high-resolution mapping of explosive precursors

V. Mitev, S. Babichenko, J. Bennes, R. Borelli, A. Dolfi-Bouteyre, L. Fiorani, L. Hespel, T. Huet, A. Palucci, M. Pistilli, A. Puiu, O. Rebane, I. Sobolev

Proceedings Volume 8894, 88940S (2013) https://doi.org/10.1117/12.2028374

KEYWORDS: Signal detection, Sensors, Databases, Optical parametric oscillators, Backscatter, Calibration, Mid-IR, Mirrors, Target detection, Pulsed laser operation

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Proceedings Article | 15 October 2012 Paper

Active imaging models and systems to see through adverse conditions: application to the surveillance of an aircraft environment

Nicolas Riviere, Laurent Hespel, Erwan Bernard, Romain Ceolato, Bernard Tanguy

Proceedings Volume 8512, 85120X (2012) https://doi.org/10.1117/12.929856

KEYWORDS: 3D modeling, Imaging systems, Fiber optic gyroscopes, Sensors, Atmospheric propagation, Air contamination, 3D image processing, Backscatter, Systems modeling, 3D acquisition

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Proceedings Article | 23 February 2012 Paper

Hyperspectral polarized light scattering for dense nanomaterials characterization

Romain Ceolato, Nicolas Riviere, Laurent Hespel, Beatrice Biscans

Proceedings Volume 8271, 82710J (2012) https://doi.org/10.1117/12.908713

KEYWORDS: Light scattering, Nanoparticles, Bidirectional reflectance transmission function, Nanomaterials, Scattering, Sensors, Mie scattering, Laser sources, Polarization, Spherical lenses

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Proceedings Article | 20 October 2011 Paper

Supercontiuum laser-based instrument to measure hyperspectral polarized BRDF

Romain Ceolato, Nicolas Rivière, Laurent Hespel, Beatrice Biscans

Proceedings Volume 8189, 818913 (2011) https://doi.org/10.1117/12.898004

KEYWORDS: Reflectivity, Bidirectional reflectance transmission function, Calibration, Imaging systems, Light scattering, Scattering, Defense and security, Remote sensing, Sensors, Reflectometry

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Proceedings Article | 6 October 2011 Paper

Results of ACTIM: an EDA study on spectral laser imaging

Dominique Hamoir, Laurent Hespel, Philippe Déliot, Yannick Boucher, Ove Steinvall, Jörgen Ahlberg, Hakan Larsson, Dietmar Letalick, Peter Lutzmann, Endre Repasi, Gunnar Ritt

Proceedings Volume 8186, 81860M (2011) https://doi.org/10.1117/12.903672

KEYWORDS: Sensors, Signal to noise ratio, Laser imaging, LIDAR, Reflectivity, Imaging systems, Target detection, Interference (communication), Polarization, 3D modeling

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Proceedings Article | 5 October 2011 Paper

Performance evaluation of laser scanners through the atmosphere with adverse condition

L. Hespel, N. Riviere, T. Huet, B. Tanguy, R. Ceolato

Proceedings Volume 8186, 818606 (2011) https://doi.org/10.1117/12.898010

KEYWORDS: Signal to noise ratio, Laser scanners, Backscatter, Fiber optic gyroscopes, Interference (communication), Sensors, Signal detection, Reflectivity, Visibility through fog, Visibility

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Proceedings Article | 5 October 2011 Paper

Active imaging systems to perform the strategic surveillance of an aircraft environment in bad weather conditions

Nicolas Riviere, Laurent Hespel, Romain Ceolato, Florence Drouet

Proceedings Volume 8186, 81860H (2011) https://doi.org/10.1117/12.897994

KEYWORDS: 3D modeling, Imaging systems, Fiber optic gyroscopes, Atmospheric propagation, Sensors, 3D image processing, Air contamination, 3D scanning, LIDAR, Laser scanners

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Proceedings Article | 9 October 2010 Paper

Physical modelling of point-cloud (3D) and full-wave-form (4D) laser imaging

G. Anna, L. Hespel, N. Riviere, D. Hamoir, B. Tanguy

Proceedings Volume 7835, 78350A (2010) https://doi.org/10.1117/12.864688

KEYWORDS: Imaging systems, Clouds, 3D acquisition, 3D modeling, Optical simulations, Signal to noise ratio, Laser scanners, 3D image processing, Optical properties, Bidirectional reflectance transmission function

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Proceedings Article | 9 October 2010 Paper

ACTIM: an EDA initiated study on spectral active imaging

O. Steinvall, I. Renhorn, J. Ahlberg, H. Larsson, D. Letalick, E. Repasi, P. Lutzmann, G. Anstett, D. Hamoir, L. Hespel, Y. Boucher

Proceedings Volume 7835, 78350C (2010) https://doi.org/10.1117/12.865041

KEYWORDS: Imaging systems, LIDAR, Sensors, Target detection, Imaging spectroscopy, Reflectivity, Hyperspectral imaging, 3D acquisition, Polarization, Semiconductor lasers

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Proceedings Article | 9 October 2010 Paper

Modeling of an active burst illumination imaging system: comparison between experimental and modelled 3D scene

N. Rivière, G. Anna, L. Hespel, B. Tanguy, M.-T. Velluet, Y.-M. Frédéric

Proceedings Volume 7835, 783509 (2010) https://doi.org/10.1117/12.864694

KEYWORDS: Atmospheric propagation, 3D modeling, Turbulence, Speckle, Imaging systems, Wave propagation, Sensors, Data modeling, Electro optical modeling, Light scattering

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Proceedings Article | 29 April 2010 Paper

Physical modeling of 3D and 4D laser imaging

Guillaume Anna, Dominique Hamoir, Laurent Hespel, Fabien Lafay, Nicolas Rivière, Bernard Tanguy

Proceedings Volume 7684, 768415 (2010) https://doi.org/10.1117/12.849397

KEYWORDS: 3D modeling, 3D image processing, Data modeling, Atmospheric modeling, Pulsed laser operation, Laser imaging, Atmospheric propagation, 3D acquisition, Laser scanners, Reverse modeling

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Proceedings Article | 29 August 2009 Paper

Comparison of a physics-based BIL simulator with experiments

L. Hespel, M. Velluet, A. Bonnefois, N. Rivière, M. Fraces, D. Hamoir, B. Tanguy, B. Duchenne, J. Isbert

Proceedings Volume 7382, 73822T (2009) https://doi.org/10.1117/12.836753

KEYWORDS: Turbulence, Scintillation, Cameras, Sensors, Short wave infrared radiation, Reflectivity, 3D modeling, Point spread functions, Bidirectional reflectance transmission function, Imaging systems

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Proceedings Article | 29 August 2008 Paper

Pump probe experiment for high scattering media diagnostics

Marie Barthélemy, Nicolas Rivière, Laurent Hespel, Thibault Dartigalongue

Proceedings Volume 7065, 70650Z (2008) https://doi.org/10.1117/12.794774

KEYWORDS: Particles, Absorbance, Light scattering, Scattering media, Optical testing, Femtosecond phenomena, Silica, Sensors, Scattering, Laser applications

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Proceedings Article | 29 August 2008 Paper

Modeling of femtosecond pulse propagation through dense scattering media

Nicolas Rivière, Marie Barthélèmy, Thibault Dartigalongue, Laurent Hespel

Proceedings Volume 7065, 70650X (2008) https://doi.org/10.1117/12.794980

KEYWORDS: Particles, Monte Carlo methods, Scattering, Photon transport, Light scattering, Scattering media, Femtosecond phenomena, Interfaces, Solids, Reflection

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Proceedings Article | 24 July 2000 Paper

Round robin of painted targets BRDF measurements

Yannick Boucher, Carole Deumie, Claude Amra, Laurent Pinard, Jean-Marie Mackowski, Stephane Mainguy, Laurent Hespel, Jean-Francois Perelgritz

Proceedings Volume 4029, (2000) https://doi.org/10.1117/12.392522

KEYWORDS: Bidirectional reflectance transmission function, Reflectivity, Sensors, Scattering, Speckle, Calibration, Solids, Laser scattering, Pollution, Carbon dioxide lasers

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