Dr. Riad Bourayou Profile

Dr. Riad Bourayou

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Publications (7)

Proceedings Article | 20 October 2014 Paper

Comparison between two algorithms based on different wavelets to obtain the planetary boundary layer height

Gregori de Arruda Moreira, Fabio da Silva Lopes, Juan Guerrero-Rascado, Maria José Granados-Muñoz, Riad Bourayou, Eduardo Landulfo

Proceedings Volume 9246, 92460D (2014) https://doi.org/10.1117/12.2067352

KEYWORDS: Wavelets, LIDAR, Atmospheric modeling, Algorithm development, Signal detection, Aerosols, Transform theory, Temporal resolution, Telescopes, Systems modeling

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Proceedings Article | 22 October 2013 Paper

Stand-off mapping of the soot extinction coefficient in a refinery flare using a 3-wavelength elastic backscatter lidar

Renata da Costa, Riad Bourayou, Eduardo Landulfo, Roberto Guardani, Igor Veselovskii, Juliana Steffens

Proceedings Volume 8894, 88940P (2013) https://doi.org/10.1117/12.2027240

KEYWORDS: LIDAR, Refractive index, Backscatter, Atmospheric particles, Aerosols, Particles, Atmospheric optics, Telescopes, Atmospheric monitoring, Remote sensing

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Proceedings Article | 22 October 2013 Paper

Automatic methods to detect the top of atmospheric boundary layer

Gregori Moreira, Riad Bourayou, Fabio da Silva Lopes, Taciana Albuquerque, Neyval Reis, Gerhard Held, Eduardo Landulfo

Proceedings Volume 8894, 88940T (2013) https://doi.org/10.1117/12.2028750

KEYWORDS: LIDAR, Clouds, Atmospheric particles, Aerosols, Atmospheric sensing, Wavelets, Signal detection, Algorithm development, Atmospheric modeling, Environmental sensing

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Proceedings Article | 1 November 2012 Paper

Measurement of tropospheric aerosol in São Paulo area using a new upgraded Raman LIDAR system

Eduardo Landulfo, Patrícia Rodrigues, Fábio Juliano da Silva Lopes, Riad Bourayou

Proceedings Volume 8534, 853413 (2012) https://doi.org/10.1117/12.975060

KEYWORDS: LIDAR, Aerosols, Backscatter, Raman spectroscopy, Signal attenuation, Atmospheric particles, Nitrogen, Humidity, Optical properties, Data centers

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Elastic backscatter LIDAR systems have been used to determine aerosol profile concentration in several areas such as weather, pollution and air quality monitoring. In order to determine the aerosol extinction and backscattering profiles, the Klett inversion method is largely used, but this method suffers from lack of information since there are two unknown variables to be determined using only one measured LIDAR signal, and assumption of the LIDAR ratio (the relation between the extinction and backscattering coefficients) is needed. When a Raman LIDAR system is used, the inelastic backscattering signal is affected by aerosol extinction but not by aerosol backscatter, which allows this LIDAR to uniquely determine extinction and backscattering coefficients without any assumptions or any collocated instruments. The MSP-LIDAR system, set-up in a highly dense suburban area in the city of São Paulo, has been upgraded to a Raman LIDAR, and in its actual 6-channel configuration allows it to monitor elastic backscatter at 355 and 532 nm together with nitrogen and water vapor Raman backscatters at 387nm and 608 nm and 408nm and 660 nm, respectively. Thus, the measurements of aerosol backscattering, extinction coefficients and water vapor mixing ratio in the Planetary Boundary Layer (PBL) are becoming available. The system will provide the important meteorological parameters such as Aerosol Optical Depth (AOD) and will be used for the study of aerosol variations in lower troposphere over the city of São Paulo, air quality monitoring and for estimation of humidity impact on the aerosol optical properties, without any a priori assumption. This study will present the first results obtained with this upgraded LIDAR system, demonstrating the high quality of obtained aerosol and water vapor data. For that purpose, we compared the data obtained with the new MSP-Raman LIDAR with a mobile Raman LIDAR collocated at the Center for Lasers and Applications, Nuclear and Energy Research Institute in São Paulo and radiosonde data from Campo de Marte Airport, in São Paulo.

SPIE Journal Paper | 1 July 2008 Open Access

Fluorescence tomography technique optimized for noninvasive imaging of the mouse brain

Riad Bourayou, Heide Boeth, Heval Benav, Thomas Betz, Ute Lindauer, Till Nierhaus, Jan Klohs, Andreas Wunder, Ulrich Dirnagl, Jens Steinbrink

JBO, Vol. 13, Issue 04, 041311, (July 2008) https://doi.org/10.1117/12.10.1117/1.2968262

KEYWORDS: Sensors, Brain, Monte Carlo methods, Tissues, Head, Optical properties, Fluorescence tomography, Tomography, Neuroimaging, Luminescence

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Proceedings Article | 4 November 2003 Paper

Ultrashort laser applications in lidar and atmospheric sciences

Jerome Kasparian, Riad Bourayou, Veronique Boutou, Catherine Favre, Guillaume Mejean, Didier Mondelain, Andre Mysyrowicz, Miguel Rodriguez, Estelle Salmon, Roland Sauerbrey, Holger Wille, Jean-Pierre Wolf, Ludger Woeste, Jin Yu, L. Klingbeil, K. Rethmeier, W. Kalkner, A. Hartzes, H. Lehman, J. Eisloeffel, Bringfried Stecklum, J. Winkler, Uwe Laux, S. Hoenger, Yong-Le Pan, Richard Chang, Steve Hill

Proceedings Volume 5226, (2003) https://doi.org/10.1117/12.519494

KEYWORDS: LIDAR, Atmospheric particles, Aerosols, Atmospheric propagation, Atmospheric laser remote sensing, Femtosecond phenomena, Dispersion, Remote sensing, Laser applications, Atmospheric sciences

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Proceedings Article | 22 September 2003 Paper

Femtosecond LIDAR: new perspectives of atmospheric remote sensing

Miguel Rodriguez, Riad Bourayou, Jerome Kasparian, Guillaume Mejean, Andre Mysyrowicz, Estelle Salmon, Roland Sauerbrey, Holger Wille, Ludger Woste, Jean-Pierre Wolf, Jin Yu, Wiebke Zimmer

Proceedings Volume 5149, (2003) https://doi.org/10.1117/12.518849

KEYWORDS: LIDAR, Femtosecond phenomena, Atmospheric propagation, Atmospheric particles, Absorption, Atmospheric optics, Aerosols, Plasma, Remote sensing, Telescopes

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