Academic literature on the topic 'Fluorescence induite par LED'
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Journal articles on the topic "Fluorescence induite par LED"
Huré, L., E. Robert, C. Cachoncinlle, R. Viladrosa, and J. M. Pouvesle. "Caractérisation de jets gazeux par radiographie éclair et Fluorescence Induite par flash X (F.I.X.)." Le Journal de Physique IV 09, PR5 (May 1999): Pr5–83—Pr5–84. http://dx.doi.org/10.1051/jp4:1999527.
Full textSivert, A., B. Vacossin, and F. Betin. "Pédagogie communautaire discursive, application éclairage LED vélo." J3eA 21 (2022): 2022. http://dx.doi.org/10.1051/j3ea/20222022.
Full textJonin, C., P. Laporte, R. Saoudi, M. Hemici, and M. Bon. "Fluorescence de l'excimère Xe2* induite par excitation à deux photons : effet des hautes températures." Annales de Physique 20, no. 5-6 (1995): 621–22. http://dx.doi.org/10.1051/anphys:199556041.
Full textLalo, C., J. Deson, C. Cerveau, and R. I. Ben-Aïm. "Détection de NO dans la post-décharge d'un plasma de N2/O2 par fluorescence induite par laser ArF." Annales de Physique 17 (June 1992): 63–65. http://dx.doi.org/10.1051/anphys/1992013.
Full textKashdan, Julian. "Visualisation du mélange gazeux au sein de la chambre de combustion des moteurs par la fluorescence induite par laser." Photoniques, no. 52 (March 2011): 34–36. http://dx.doi.org/10.1051/photon/20115234.
Full textLavieille, Pascal, Fabrice Lemoine, Michel Lebouché, and Gérard Lavergne. "Mesure de la température de gouttelettes en combustion par fluorescence induite par laser à deux couleurs : résultats préliminaires et perspectives." Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics 329, no. 8 (August 2001): 557–64. http://dx.doi.org/10.1016/s1620-7742(01)01361-7.
Full textAit Sakel, Adil, Adil Mazdar, and Faustin N'guibou. "Rôle de la cystoscopie de fluorescence en lumière bleue induite par Hexvix dans la prise en charge des tumeurs urothéliales vésicales." Canadian Urological Association Journal 8, no. 3-4 (March 11, 2014): 216. http://dx.doi.org/10.5489/cuaj.677.
Full textMottin, SJ, P. Laporte, R. Cespuglio, and M. Jouvet. "Fluorescence induite par laser sur les tissus profonds du cerveau du rat : application à l'étude du cycle veille-sommeil." Annales de Physique 19 (October 1994): C1–187—C1–194. http://dx.doi.org/10.1051/anphys/1994048.
Full textRobert, E., L. Huré, C. Cachoncinlle, R. Viladrosa, and J. M. Pouvesle. "Développement de la radiographie X éclair et de l'imagerie de fluorescence induite par X pour la caractérisation de milieux fluides." Le Journal de Physique IV 11, PR7 (October 2001): Pr7–171—Pr7–174. http://dx.doi.org/10.1051/jp4:2001751.
Full textHitier, J. B., E. Blin, J. P. Tourtier, and C. Pierret. "Évaluation de la microcirculation par fluorescence du vert d’indocyanine induite par laser IC-View® chez le patient présentant une artériopathie obstructive des membres inférieurs stade IV." Journal des Maladies Vasculaires 36, no. 2 (March 2011): 122–23. http://dx.doi.org/10.1016/j.jmv.2010.12.081.
Full textDissertations / Theses on the topic "Fluorescence induite par LED"
Elmaimouni, Lahcen. "Etude cinétique de l'équilibre entre les radicaux benzyle et benzylpéroxyle et mesure des constantes de vitesse des réactions des radicaux éthoxy (avec O2 et NO) et hydroxyle (avec CH3CFCl2)." Lille 1, 1994. http://www.theses.fr/1994LIL10085.
Full textLoayza, Loza Hildo. "Suivi expérimental du rendement de fluorescence des couverts végétaux par des techniques actives et passives. Application à la détection du stress hydrique." Electronic Thesis or Diss., Sorbonne université, 2022. http://www.theses.fr/2022SORUS465.
Full textThe chlorophyll fluorescence (ChlF) is directly related to the photosynthetic process. However, at canopy level this physiological link between fluorescence and photosynthesis may be blurred by structural vegetation changes and geometrical effects linked to interactions between sunlight and the three-dimensional structure of the canopy. Furthermore, much of our knowledge about the relationship between fluorescence and the physiological status of plants come from leaf level studies carried out under laboratory conditions. The physiological significance of ChlF at canopy level and under natural conditions is still a major subject of research and a source of uncertainties in the interpretation of SIF. This doctoral project aims were: 1. To study chlorophyll fluorescence yield at canopy level: we describe a new instrument, Ledflex, which is a micro-LIDAR dedicated to perform continuous measurements of vegetation fluorescence yield. Ledflex has been successfully applied under full sunlight conditions to establish the signature of water-stress on a pea (Pisum Sativum) canopy. Under well-watered conditions the Fs diurnal cycle present an M shape with a minimum (Fmin) at noon which is higher than the fluorescence level observed at predawn (Fo). After several days withholding watering, Fs decreases and Fmin
Longchamps, Louis. "Discrimination entre le maïs et les mauvaises herbes par la signature spectrale de fluorescence induite par UV." Thesis, Université Laval, 2006. http://www.theses.ulaval.ca/2006/23931/23931.pdf.
Full textDevillers, Robin. "Développement et exploitation de techniques de diagnostic optique de mesure de température pour la compréhension des phénomènes de combustion dans les moteurs thermiques." Châtenay-Malabry, Ecole centrale de Paris, 2008. http://www.theses.fr/2008ECAP1092.
Full textTemperature of the in-cylinder gas mixture is a key parameter for combustion in internal combustion (IC) engines. Temperature has a significant influence on mixture preparation, auto-ignition chemistry, combustion and pollutant emissions formation. Understanding the underlying physical phenomena requires advanced measurement techniques that provide accurate spatial and temporal distributions of temperature. The objective of this research is therefore, to develop advanced measurement techniques applicable in optical IC engines, based on laser-induced fluorescence (LIF) imaging. The first part focuses on a technique dedicated to the measurement of unburned gas temperature based on toluene tracer fluorescence. The toluene LIF emission shits spectraly as a function of temperature and this shift can be estimated by measuring the LIF signal in two distinct spectral ranges. The calibration of this signal ratio is performed with emission spectra acquired during the compression of an engine. 2D temperature distributions were then acquired in the engine using the toluene LIF technique. Several experimental conditions were investigated, leading to two measurement strategies depending on the temperature range. The second part describes the two-line OH LIF technique for temperature measurements within the burned combustion gases. Various excitation wavelengths were tested in a steady-state Bunsen-type methane/air flame at 1 bar as well as in an optical engine in order to select appropriate OH lines. The error due to laser sheet attenuation was minimized by selecting two OH transitions with similar absorption characteristics. This strategy was tested in a counter-flow burner flame
Gautier, Pierre. "Dosage des polluants NO et CO par imagerie de fluorescence induite par laser dans les écoulements réactifs." Thesis, Normandie, 2017. http://www.theses.fr/2017NORMIR26/document.
Full textThis PhD work is to develop a quantitative imaging technique for measurements of the concentration of pollutants in reactive flows. On one hand, the concern was to develop the NO fluorescence imaging technique. For this purpose, an n-level fluorescence model was first developed to calculate the behavior of fluorescence signals with temperature, species concentration, and pressure. Then this model was validated with fluorescence and absorption measurements acquired in an optical cell up to 800 K and to 20 bar and in a high-pressure laminar burner. From this model, a strategy used to measure the instantaneous NO distribution in a stratified flame was defined. Then, a similar study to detect CO with fluorescence was then investigated. Two-photon fluorescence measurements were performed in the optical cell and in a flame. The results make clear that the spectroscopic diagnostic becomes operational with the need to improve the performances of propulsion systems
Delconte, Alain. "Fluorescence induite par laser multibande appliquée à la mesure de température dans les milieux complexes." Thesis, Vandoeuvre-les-Nancy, INPL, 2009. http://www.theses.fr/2009INPL062N/document.
Full textMultiband laser-induced fluorescence is a non-intrusive technique able to provide a measurement of the liquid phase of complex media. The application of this technique in single phase liquids, with a variable optical path (product of the fluorescent tracer molecular concentration by the distance between the probe volume and the collection optics in the liquid) was considered. The ratio of the fluorescence intensities collected on two spectral bands allows removing the influence of the fluorescence tracer concentration, incident laser intensity and probe volume. A third spectral band of detection is used to take into account the re-absorption of the fluorescence in the case of non negligible and variable optical paths. Then, the application of this technique to the measurement of the temperature of the liquid phase of a spray is presented. A specific data processing was developed in order to take into account the random presence of droplets in the probe volume. Moreover, the processing was adapted to achieve combined fluorescence and droplet size measurements using the phase Doppler technique. The overall foreseen goal is to measure temperature per droplet size class. However, several disturbing phenomena were highlighted: - an unexpected non-linear dependence on the droplet size of the ratio of the fluorescence intensities collected on two spectral bands, - a strong incident laser light scattering by the droplets cloud, which induces a fluorescence beyond the excitation zone. This fluorescence is also collected in the depth of field of the optical device and combines with the non-linear size dependence. A correction strategy of these phenomena was implemented and a validation experiment on a heated spray injected in a vapour-saturated cell was performed
Karoui, Asma. "Caractérisation de l'hydrodynamique et du mélange dans les mélangeurs statiques sulzer smv." Toulouse, INPT, 1998. http://www.theses.fr/1998INPT017G.
Full textGrondin, John. "Etude du mélange et de la combustion dans les flammes jets subsoniques à haute vitesse : influence des vitesses, des densités et de la composition du combustible." Phd thesis, Chasseneuil-du-Poitou, Ecole nationale supérieure de mécanique et d'aéronautique, 2009. http://tel.archives-ouvertes.fr/tel-00443950.
Full textDumand, Clement. "Mélange et combustion dans les petits volumes : application au micro systèmes énergétiques." Poitiers, 2005. http://www.theses.fr/2005POIT2348.
Full textThe study presented in this memory proposes an overview of difficulties related to combustion in small volumes. We seek to design a micro combustor supporting a stable and intensive combustion using the various numerical and experimental tools. In this study, we focus on the combustion and mixing in micro combustors. In a first approach, the ranges of stable combustion were determined as well as the most influential parameters on the combustion efficiency using OD models of Perfectly Stirred Reactor and Partially Stirred Reactor. The mixing between air and fuel upstream of the injection in the micro combustor was characterised experimentally using the PLIF method. A jet of fuel was injected perpendicularly to a flow of air in a small channel (1. 3 mm height). The parametric study undertaken experimentally provides an extensive data base useful to define the inlet conditions in 3D calculations of micro combustors. Moreover, 3D numerical simulations of combustion in realistic geometries of micro combustors were carried out. The results of this study will allow to prepare trial runs in the ONERA new laboratory dedicated to the study of combustion in small volumes. We have also seen that, at these small dimensions, the turbulent mixing is weak and the micromixing is a very important parameter for the stability and the combustion efficiency. The model of PaSR was used to compare and to choose a micromixing model among three, in order to integrate it in a CFD code and to refine the modeling of combustion in micro combustors
Es-Sebbar, Et-touhami. "Étude électrique et analyse par fluorescence induite par laser des décharges de Townsend à la pression atmosphérique dans N2, N2/N2O et N2/O2." Toulouse 3, 2007. http://www.theses.fr/2007TOU30078.
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