Montpellier, France
Montpellier, France

Time filter

Source Type

Naillon A.,CNRS Laboratory for Analysis and Architecture of Systems | Naillon A.,CNRS Institute of Fluid Mechanics of Toulouse | Massadi H.,CNRS Laboratory for Analysis and Architecture of Systems | Courson R.,Kloe SA | And 4 more authors.
20th International Conference on Miniaturized Systems for Chemistry and Life Sciences, MicroTAS 2016 | Year: 2016

We report a new, fast and versatile method to fabricate nanochannels with non-uniform depth in a single step, in the range 50-500nm. The process is based on maskless laser lithography to structure a photosensitive resist (PR). The lateral dimension can be as small as 2μm. Functional nanofluidic chips with slopes, steps, and pore networks mimicking a nanoporous medium were fabricated and tested.


Wood T.,Aix - Marseille University | Le Rouzo J.,Aix - Marseille University | Flory F.,École Centrale Marseille | Kribich R.K.,CNRS Electronic Systems Institute | And 4 more authors.
Sensors and Actuators, A: Physical | Year: 2013

In this paper, we will demonstrate a theoretical approach to determining the optical response of interferometric detector systems to external stimuli. The wavelength dispersion of the refractive index and the thermo-optic coefficient of transparent polymer blend waveguide materials are inserted into modeling software in order to simulate the optical response of both Multimode Interferometer (MMI) and Bragg grating (BG) architectures. The optical output of such devices is very sensitive to variations in the refractive index of the constituent materials, and they may be used to detect phenomena such as local temperature changes or relative humidity variations [1]. When the input intensity of the sensor system is normalized to unity, we demonstrate theoretical thermal sensitivities of 2 × 10-4/K for BG architectures and 3 × 10-5/K for MMI devices. A differential measurement system for BG or MMI components is discussed and simulated. We shall also discuss the use of such systems as gas detectors when a catalyst capable of accelerating the exothermic oxidation of combustible gasses is deposited onto the optical circuit. © 2013 Elsevier B.V. All rights reserved.


Grant
Agency: European Commission | Branch: FP7 | Program: CP | Phase: ENERGY.2012.5.2.1 | Award Amount: 12.29M | Year: 2012

TRUST aims at conducting CO2 injection experiments at scales large enough so that the output can be extrapolated at industrial scales. It relies on four sites: the heavily instrumented sites of Heletz (Israel, main site) and Hontomin (Spain), access Miranga (Brazil) and the emerging site in the Baltic Sea region. The objectives are to: carry out CO2 injection with different strategies, displaying characteristics representative of the large scale storage and with injection volumes that will produce extrapolable reservoir responses; Develop, use and implement characterization and MMV technologies for maximized safety and minimized risks, including real time visualization of the CO2 containment and detection of possible failures; Develop optimal injection strategies that maintain realistic figures of injectivity, and capacity while simultaneously optimizing the use of energy; Detect and mitigate CO2 leakage at an abandoned well; Produce comprehensive datasets for model verification and validation; Improve the predictive capacity and performance of computational models, as well as their capability to handle uncertainty and thermo-hydro-mechanical and chemical phenomena at different scales (at the scale of the experiments) and upscaling (extrapolation to industrial scale) simulations; Address critical non-scientific issues of public acceptance, community participation, communication, dissemination, liabilities and prepare templates for the preparation and application of injection licenses and communication with regulators; Establish on-site facilities for analysis of monitoring and measurement, providing training and capacity building; Address the risk assessment in a meaningful way; Prepare a platform for the exploitation of project findings and for knowledge and information sharing with planned, large scale, CCS projects. Allow open access to sites, and seek cooperation with large scale CO2 injection projects both at the European and International levels.


Wood T.,Aix - Marseille University | Le Rouzo J.,Aix - Marseille University | Flory F.,École Centrale Marseille | Coudray P.,Kloe SA | And 3 more authors.
Optical Engineering | Year: 2013

Two optical techniques, m-lines and spectroscopic ellipsometry, are compared for their suitability for obtaining the wavelength and the temperature dispersion of the refractive index of thin-film layers used in gas detector devices. Two types of materials that are often integrated into gas sensors are studied: a polymer organicinorganic blend deposited by spin coating typically used in near-infrared waveguides and the ceramic semiconductor SrTi1xFexO3 (strontium titanate) doped with iron at concentrations x = 0.075 and 0.1 deposited by electron beam deposition. The refractive index dispersion obtained by m-lines and ellipsometry is compared, and the differences between the measured parameters for the two materials are discussed. The chromatic dispersion will be represented by a three-term Cauchy law. An intuitive method for verifying the measured indices using an integrating sphere and reflexion coefficient modeling techniques are also demonstrated. Thermo-optic coefficients in the order of 1 × 104/K for both materials are reported, and very low chromatic dispersions are also measured, thanks to the high sensitivity of the m-lines technique. The uniaxial anisotropic properties of the polymerblend films are measured and discussed in the case of the semiconductor films. © 2013 Society of Photo-Optical Instrumentation Engineers.


Wood T.,Aix - Marseille University | Rouzo J.L.,Aix - Marseille University | Flory F.,Aix - Marseille University | Flory F.,École Centrale Marseille | And 4 more authors.
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2012

Two optical techniques, "m-lines" and spectroscopic ellipsometry, are compared for their suitability for obtaining the wavelength and temperature dispersion of the refractive index of thin film layers used in gas detector devices. Two types of materials often integrated into gas sensors are studied: a polymer organic-inorganic blend deposited by spin-coating typically used in near infra-red waveguides and the ceramic semiconductor SrTi1-xFexO3 (strontium titanate) doped with iron at concentrations x = 0.075 and 0.1 deposited by electron beam deposition. In this paper, we will compare the refractive index dispersion obtained by m-lines and ellipsometry, and comment on the differences between the measured parameters for the two materials. The chromatic dispersion will be represented by a three term Cauchy law. An intuitive method of verifying the measured indices using an integrating sphere and reflexion coefficient modelling techniques will also be demonstrated. Thermo-optic coefficients of the order of -1×10-4/K for both materials are reported, and very low chromatic dispersions are also measured thanks to the high sensitivity of the m-lines technique. © 2012 SPIE.


Grant
Agency: European Commission | Branch: FP7 | Program: CP-FP | Phase: HEALTH.2010.1.2-1 | Award Amount: 10.45M | Year: 2011

In the frame of this project it is proposed to define and build a bi-modal PET-US (Positron Emission Tomography and Ultrasound) endoscopic probe combining in a miniaturized system a fully digital, 200ps time resolution Time of Flight PET detector head (TOF-PET) coupled to a commercial ultrasound (US) assisted biopsy endoscope and to launch the first steps of clinical validation. The project addresses and combines several objectives of the topics Health 2010.1.2-1, such as novel multimodality imaging tools, including a single photon (quantum) counting PET detector head for the purpose of identifying and quantifying morphologic and functional markers and of developing new biomarkers of tumoral processes at the preclinical and clinical levels. Moreover the endoscopic approach, combined with an unprecedented PET timing resolution will allow more sensitive, more precise, lower radiation dose and less invasive imaging and intervention on small internal structures and lesions.


Grant
Agency: European Commission | Branch: FP7 | Program: MC-ITN | Phase: FP7-PEOPLE-2011-ITN | Award Amount: 5.70M | Year: 2011

We propose to establish a special detector-training network aiming to extend the application of cutting-edge technologies developed in High Energy Physics (HEP) to other domains, such as medical imaging. A large number of detector techniques, developed for and used in particle physics experiments, has been transferred successfully to other fields. Most prominent are their applications in medicine, X-ray imaging, materials research, astrophysics and others. These technological spin-offs are of highest value for society and will be a focal point in this Network. Not only for positron emission tomography (PET), the Network will likewise respond to the need to develop new ultra-fast photo-detection for the future generation of linear colliders with unprecedented beam intensities. The Multi-Site Network, to be coordinated by CERN, would be an interdisciplinary, multi-national initiative whose main goal is to train young researchers in the domain of novel high-speed photo-detection instruments in HEP calorimetry and also to make use of photon time of flight (TOF) in PET, thus enabling us for the first time to considerably enhance image quality with instant benefits to patients and medical institutions. This multi-site ITN comprises 11 full partners, 7 in academia and 4 in the private sector, known world-wide in the fields of frontier detector technologies, photo detection techniques and novel scintillator production methods, as well as in the domain of semiconductor technology, medical instrumentation, image reconstruction and fusion, and surgical tracking and navigation. As such, the Network combines the necessary competence, expertise and infrastructure for top-level training of young researchers. It is foreseen to hire 18 Early Stage Researchers (ESRs) plus 4 Experienced Researchers (ERs) and structure the training project into five principle research-oriented work packages, and three work package for management, training and outreach.


Wood T.M.,French National Center for Scientific Research | Le Rouzo J.,French National Center for Scientific Research | Flory F.R.,École Centrale Marseille | Escoubas L.,French National Center for Scientific Research | Coudray P.,Kloe SA
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2011

The m-lines guided mode technique is demonstrated as a powerful tool for the measurement of wavelength and temperature refractive index dispersion in thin films. The proper treatment of results reveals measurement uncertainties of the order of 10-3 for the refractive index, and a sensitivity to changes in this quantity of the order 10-6. Furthermore, the thickness of the films can be established to a precision of 1nm. Using an optical stack consisting of a silicon wafer substrate, a low index buffer layer (index 1.52), topped with a polymer blend guiding film, The wavelength dispersion of the change of refractive index of the guiding film with temperature has been successfully measured. The temperature dispersion of the refractive index of the guiding layer is of ∼ -6.7x10-5 /K. © 2011 SPIE.


Youssef S.,Montpellier University | Youssef S.,Université Ibn Tofail | Podlecki J.,Montpellier University | Habchi R.,Université Ibn Tofail | And 5 more authors.
Sensors and Actuators, B: Chemical | Year: 2012

A zinc-oxide based optical sensor is realized. This prototype is based on the properties of Bragg reflectors, first the measurement principles are described then the experimental results are presented. This sensor has proven to be sensitive and reliable in the case of detecting low concentrations of butane. The sensor is stabilized and desorbed by a flow of nitrogen. In the case of methane detection, the use of nitrogen was found inappropriate, ambient air has proven to be more suitable. © 2012 Elsevier B.V.


Patent
Kloe S.A. | Date: 2010-08-19

A measuring device including at least one optical fiber which contains a series of Bragg gratings distributed between first and second ends of the fiber. A light source is arranged to emit a luminous flux at multiple wavelengths incident on the first end of the fiber, and an instrument connected to the second end of the fiber measures the power of the light transmitted at each emitted wavelength, enabling implementation of the method. In the method the power of the light transmitted by the optical fiber in a spectrum including wavelengths is measured.

Loading Kloe SA collaborators
Loading Kloe SA collaborators