Auswahl der wissenschaftlichen Literatur zum Thema „Détection de trace de gaz“
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Zeitschriftenartikel zum Thema "Détection de trace de gaz"
Duquesnoy, Maxime, Jean-Michel Melkonian, Raphaël Levy, Myriam Raybaut, Jean-Baptiste Dherbecourt und Antoine Godard. „Comprendre. Détection de gaz par spectroscopie photoacoustique : principe et mise en œuvre“. Photoniques, Nr. 94 (November 2018): 38–44. http://dx.doi.org/10.1051/photon/20189438.
Der volle Inhalt der QuelleJOURNEAU, C. „DÉTECTION ACOUSTIQUE ACTIVE DE GAZ DANS UNE ENCEINTE MÉTALLIQUE“. Le Journal de Physique IV 02, Nr. C1 (April 1992): C1–409—C1–412. http://dx.doi.org/10.1051/jp4:1992188.
Der volle Inhalt der Quelle-CAZAUBON, Christian. „Système multicapteurs de détection de gaz, portable, utilisant la technique du fenêtrage temporel“. Revue de l'Electricité et de l'Electronique -, Nr. 03 (1999): 55. http://dx.doi.org/10.3845/ree.1999.027.
Der volle Inhalt der QuelleHarizi, Athmane, El Ahcene Mahfoudi und Abderrahmane Gahmousse. „Simulation numérique de la transition laminaire/turbulent de la couche limite autour d’une aube de turbine à gaz“. Journal of Renewable Energies 15, Nr. 4 (25.10.2023): 561–70. http://dx.doi.org/10.54966/jreen.v15i4.345.
Der volle Inhalt der QuelleJouhannaud, Julien, Jérôme Rossignol und Didier Stuerga. „Développement d'un nouveau capteur de gaz basé sur la détection à large bande micro-onde“. Comptes Rendus Physique 8, Nr. 3-4 (April 2007): 456–61. http://dx.doi.org/10.1016/j.crhy.2007.04.013.
Der volle Inhalt der QuelleNicolas-Saint Denis, Cécila, Piero Visani, Gilles Trystram, Joseph Hossenlopp und Romain Houdard. „Faisabilité de la détection d'odeurs défauts dans des liqueurs de cacao à l'aide de capteurs de gaz“. Sciences des Aliments 21, Nr. 5 (28.10.2001): 537–54. http://dx.doi.org/10.3166/sda.21.537-554.
Der volle Inhalt der QuelleMiron, Catalin. „Comment suivre à la trace les mouvements des atomes dans les gaz ?“ Reflets de la physique, Nr. 34-35 (Juni 2013): 81–83. http://dx.doi.org/10.1051/refdp/201334081.
Der volle Inhalt der QuelleLadurie, Emmanuel Le Roy, Jean-Noël Barrandon, Bruno Collin, Maria Guerra und Cécile Morrisson. „Sur les traces de l'argent du Potosî“. Annales. Histoire, Sciences Sociales 45, Nr. 2 (April 1990): 483–505. http://dx.doi.org/10.3406/ahess.1990.278849.
Der volle Inhalt der QuelleA, TRAORE, TOURE H, BARRY A, DIARRA D, KANOUTE G und DIARRA B. „Contamination Des Laits Importes Au Mali Par Les Radionucléides“. International Journal of Progressive Sciences and Technologies 39, Nr. 1 (27.06.2023): 287. http://dx.doi.org/10.52155/ijpsat.v39.1.5408.
Der volle Inhalt der QuelleYayayürük, Aslı Erdem, Selim Girgin, Serkan Vuruk, Ülkü Güler, Melike Güngör, Halil İbrahim Bostancı und Serap Annette Akgür. „İdrarda 11-Nor-Delta-9-Tetrahidrokannabinol-9-Karboksilik Asit’in (Thc-Cooh) GC-MS ile Analizinde Ekstraksiyon Yöntemlerinin Karşılaştırılması“. Bulletin of Legal Medicine 21, Nr. 1 (01.04.2016): 1–7. http://dx.doi.org/10.17986/blm.2016116593.
Der volle Inhalt der QuelleDissertationen zum Thema "Détection de trace de gaz"
James, Frank. „Développement d’un système de préconcentration miniaturisé pour la détection de gaz à l’état de trace/Application à la détection de COV et d’explosifs“. Thesis, Saint-Etienne, EMSE, 2015. http://www.theses.fr/2015EMSE0778/document.
Der volle Inhalt der QuelleIn order to overcome problems due to the conventional sensors detection limits, a preconcentration system is required. Accumulation of vapor(s) for detection is possible with an adsorbent and allows releasing them toward a detector, under the effect of a sudden rise of the temperature. Amplification of the concentration and the signal are obtained.This thesis continues the development of a preconcentrator for the detection of toxic gas and explosives. This preconcentrator is made of a silicon microcomponent filled with an adsorbent and a heater at its back. Two metal capillary allow ensuring the gas flow into the device. Various designs of preconcentrators were developed with different adsorbents to satisfy the requirements for volatile organic compounds (VOCs) and explosives applications.The optimization of adsorption and desorption phases is very important for the process.The coupling between a micro-chromatograph and a preconcentrator was conducted and showed the contribution of the microcomponent to the chromatography. Analysis of a VOCs mixture was achieved with initial concentrations in the order of 40 ppb, whereas the detection limit was of a few ppm. An enrichment factor of 800 was achieved.The advantage of using porous silicon was also demonstrated for the gas adsorption with low saturation vapor pressure. This result is interesting for explosive vapor préconcentration
Camara, El Hadji Malick. „Développement d'un micro-préconcentrateur pour la détection de substances chimiques à l'état de trace en phase gaz“. Phd thesis, Ecole Nationale Supérieure des Mines de Saint-Etienne, 2009. http://tel.archives-ouvertes.fr/tel-00448980.
Der volle Inhalt der QuelleCamara, El Hadji Malick. „Développement d'un micro-preconcentrateur pour la détection de substances chimiques à l'état de trace en phase gaz“. Saint-Etienne, EMSE, 2009. http://tel.archives-ouvertes.fr/tel-00448980.
Der volle Inhalt der QuelleIn the field of gas detection, one major trend is to miniaturize analytical techniques. In such technological developments, the gas pre-conditioning is usually very important. This may involve, firstly, the modification of a gas mixture, for example to improve the selectivity of a detection device, secondly, the effect of preconcentration in order to increase the sensibility of the detector. Indeed, in some applicative environments the concentration of gas is too small and therefore a preconcentration unit at the entrance of the analytical device is needed. When a preconcenrator is used, the gas mixture to be analyzed flows through it and is accumulated during some time, then the mixture is desorbed by a temperature pulse and brought to the detector. This work presents the development of a gas preconcentrator based on a micro-channel in porous and non-porous silicon filled with an adequate adsorbent material by micro-fluidic process in open micro-device or by impregnation in close one. The particularity of this device is its applicability in the fields of atmospheric pollution monitoring (Volatiles Organic Compounds-VOCs) and explosives detection (nitroaromatic compounds). Various designs of micro-devices have been investigated and a special focus has been dedicated to the carbon adsorbent. The optimization of the device and its operation were driven by its future application in outdoor environments. The benefits of using porous silicon to ease the fixing of the carbon absorbent in the reactor and to modify the gas desorption kinetic are also investigated
Rouxel, Justin. „Conception et réalisation de cellules photoacoustiques miniaturisées pour la détection de traces de gaz“. Thesis, Reims, 2015. http://www.theses.fr/2015REIMS030/document.
Der volle Inhalt der QuellePhotoacoustic cells are optical sensors based on the absorption of photons by gas molecules. The pressure wave created by gas relaxation is proportional to the trace gas concentration. Furthermore the photoacoustic signal is inversely proportional to the cell volume. Thus cell miniaturization enables performances improvements. This work consists in designing, realizing and characterizing miniaturized photoacoustic cells, based on the differential Helmholtz resonator (DHR) principle. In a first phase, modeling by the finite element method of millimeter scale cells has shown that the miniaturization of this type of resonator should effectively improve the detection limit. Thus, the ambitious realization of a DHR cell on silicon by the use of microelectronic techniques has been attempted. However, this extreme miniaturization direction encountered design and fabrication difficulties which made the produced devices unusable. To overcome these difficulties, a miniaturization alternative, at the centimeter scale, using commercial MEMS microphones, has been carried out. Three cells have been built by different methods and have been tested for methane detection. The last cell generation can detect around 100 ppb of methane with a commercial interband cascade laser at 3.357 µm of wavelength. Finally, to anticipate the next cell generation fabrication, a geometry optimization has been performed by simulation. This optimization shows that a 43 % signal improvement, compared to the most performant cell already built
Gascon, Hélène. „Détection de traces de gaz par spectroscopie à diode laser : application au sulfure d'hydrogène“. Paris 6, 2001. http://www.theses.fr/2001PA066513.
Der volle Inhalt der QuelleBounaix, Fabrice. „Etude et réalisation d'un spectromètre haute sensibilité à diode laser pour la mesure de traces de gaz : application à la détection de la vapeur d'eau“. Grenoble 1, 1993. http://www.theses.fr/1993GRE10018.
Der volle Inhalt der QuelleElmaleh, Coralie. „Développement d’un prototype ultrasensible d’analyse de gaz dans le domaine submillimétrique“. Electronic Thesis or Diss., Littoral, 2024. http://www.theses.fr/2024DUNK0698.
Der volle Inhalt der QuelleThis thesis explores the technological development of a spectroscopic experiment in the submillimeter range, also known as Terahertz (THz). This spectral band stands out for its ability to precisely resolve molecular doublets, enabling clear and precise identification of complex gas mixtures, even when other wavelengths might fail.Although the THz region offers exceptional resolving power, spectrometers operating in this region often face sensitivity challenges due to the development of technology in this band. Thanks to an innovative approach, we have implemented the first Cavity Ring-Down Spectroscopy (CRDS) experiment capable of quantifying compounds to ppb precision. The study is concentrated between 550 GHz and 650 GHz, a window of the THz spectrum that not only offers unrivalled resolution and molecular sensitivity, but also possesses the ability to penetrate non-conducting materials while being non-ionizing. These properties position this technology at the cutting edge of analysis tools, promising a plethora of applications, from fundamental research to industrial applications
Mohsen, Yehya. „Conception et caractérisation d’une plate-forme microfluidique pour la détection sélective de traces d’un produit de dégradation du TNT dans l’atmosphère“. Thesis, Besançon, 2013. http://www.theses.fr/2013BESA2004/document.
Der volle Inhalt der QuelleThe objective of this study is to develop and characterize a micro-fluidic platform allowing theconcentration and the separation of a degradation compound of trinitrotoluene: the orthonitrotoluenerecognized as an explosive taggants. Tin dioxide gas sensors (SnO2) used here asdetectors suffer from a luck of selectivity and have an insufficient sensitivity toward most ofpollutants. For that, our original approach consists to work in front of a chemical gas sensor(SnO2), in particular, by developing on the one hand a gas micro-preconcentrator to improve thesensitivity and on the other hand, a chromatographic micro-column in order to overcome the luckof selectivity.First, various adsorbents have been studied and characterized for the ONT concentration. Theobtained results allowed to select three types of activated carbons (N, KL2 and KL3) and ahydrophobic zeolite DAY. Then, the micro-system devices have been realized on a siliconsubstrate and manufactured using the silicon/glass technology.The last part of this work is devoted to the evaluation of the platform performances in terms ofconcentration and separation of ONT. In particular, after the optimization of the experimentalconditions concerning the concentration and the elution of ortho-nitrotoluene, the couplingbetween the micro-fluidic platform and a tin dioxide gas sensor allowed on the one hand to showthat the detection limit of the ONT pollutant is lower than 365 ppb. In this case, a total desorptionof the analyte and a constant concentration factor were obtained with the zeolite DAY. On theother hand, the use of this type of platform allowed to obtain a good separation and detectionperformance of ONT in presence of interferent (toluene) and at high humidity rate
Richard, Lucile. „Développements de spectromètres ultrasensibles pour l'analyse de gaz par « optical feedback cavity enhanced absorption spectrocopy » dans le moyen infrarouge avec des lasers à cascades inter-bandes“. Thesis, Université Grenoble Alpes (ComUE), 2019. http://www.theses.fr/2019GREAY004/document.
Der volle Inhalt der QuelleThis work of these has made it possible to develop and characterize the use of instruments on the "OF-CEAS" technique in the mid-infrared for traces' detection in different mixtures in the gas phase. Inter-band Cascade Laser (ICL) is the latest innovation in semiconductor lasers in this spectral region. Compatibility of ICL with OF-CEAS offers new applications for compact and robust instruments with fast response time and a low detection limit. A demonstration of the good sensitivity and stability of the OF-CEAS instruments was performed with continua absorption measurements (water vapor and nitrogen). But also with the detection of a very low intensity quadrupole line of nitrogen (3x10-29 cm-1/(moléc cm-2). The main objective of this work was to develop an instrument dedicated to nitrogen oxide detection for the analysis of exhaled breath. The analyzer is presented at the sensitivity of 6x10-10 cm-1 in an acquisition of 180 ms. Its limit of detection on NO is at the state of the art, with short term (180 ms) limit of 50 ppt. It reaches the sub-ppt level (0.9 ppt) with 12 min of integration
Kinjalk, Kumar. „Long Wavelength QCLs for BTEX and Propane detection through QEPAS“. Electronic Thesis or Diss., Université de Montpellier (2022-....), 2023. http://www.theses.fr/2023UMONS079.
Der volle Inhalt der QuelleSensitive and selective sensing of BTEX and Propane is of great interest for environmental, biomedical, and petrochemical applications. However, detecting these compounds poses unique challenges due to potential interferences, either among themselves or from other compounds. This issue can be resolved by using laser spectroscopy in the long-wavelength mid-infrared spectral region (13-15 µm), where they exhibit highly discriminating absorption features. Yet, this wavelength range is almost unexplored due to the lack of suitable sources. This thesis aims to bridge this gap by developing high-performing long-wavelength QCLs and leveraging QEPAS for ultra-sensitive and selective detection.A novel design is proposed to improve the performance of long-wavelength InAs-based QCLs, which allowed us to demonstrate a record-breaking low threshold current density of 0.6 kA/cm2 at 300 K. Additionally, a novel insulation technique using SOG is also proposed to improve device stability issues provoked by the alteration of properties of photoresist insulation (typically used for InAs-based QCLs) at elevated temperatures. Subsequently, single-frequency DFB QCLs with SMSR > 20 dB and optical output power in the mW range operating in the continuous wave regime are developed, targeting the absorption lines of these gasses. Using these DFBs, a sensing system based on QEPAS is developed, calibrated, and characterized for Toluene, Benzene, and Propane detection. Exceptionally low detection limits of 113 ppb, 3 ppb, and 3 ppm are achieved in a pure nitrogen matrix over a 10-second integration time. The system maintains selectivity and robustness, even in complex gas mixtures. Finally, a 13.71 µm QCL is successfully coupled with a HCW, where optimal coupling conditions, beam quality, and loss are explored. The study confirms the efficient transmission of such wavelength through HCW with minimal loss and improved spatial beam quality
Buchteile zum Thema "Détection de trace de gaz"
„Chapitre 11 Détection et quantification de gaz en THz“. In Optoélectronique terahertz, 305–26. EDP Sciences, 2020. http://dx.doi.org/10.1051/978-2-7598-0304-0.c012.
Der volle Inhalt der QuelleGOUHIER, Mathieu. „Surveillance des volcans par télédétection spatiale“. In Aléas et surveillance de l’activité volcanique 2, 177–226. ISTE Group, 2022. http://dx.doi.org/10.51926/iste.9045.ch3.
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