Search results for "instrumentation"
showing 4 items of 4914 documents
Recent Advances in Forward Brillouin Scattering: Sensor Applications
2022
In-fiber opto-mechanics based on forward Brillouin scattering has received increasing attention because it enables sensing the surrounding of the optical fiber. Optical fiber transverse acoustic resonances are sensitive to both the inner properties of the optical fiber and the external medium. A particularly efficient pump and probe technique—assisted by a fiber grating—can be exploited for the development of point sensors of only a few centimeters in length. When measuring the acoustic resonances, this technique provides the narrowest reported linewidths and a signal-to-noise ratio better than 40 dB. The longitudinal and transverse acoustic velocities—normalized with the fiber radius—can b…
Appropriation de l’écriture numérique : évaluation et parcours pédagogique
2014
International audience; Dans ce chapitre, nous proposons une réflexion autour de la mise en œuvre d'une notion centrale en IUT, en Info-Com, l'écriture numérique. A partir d'une méthode d'approche de cette notion, nous nous proposons de montrer comment constituer un parcours de formation. Cette méthode vise dans un premier temps à caractériser une notion essentielle dans le domaine de la communication en IUT. Ensuite, il s'agit d'analyser différentes pratiques de cours pour identifier la place de chacun d'eux par rapport à la caractérisation de la notion envisagée. Enfin, la méthode pose les étapes/parties d'un parcours de formation. Ces étapes reprennent les cours déjà mis en œuvre mais pr…
Beam-induced and cosmic-ray backgrounds observed in the ATLAS detector during the LHC 2012 proton-proton running period
2016
This paper discusses various observations on beam-induced and cosmic-ray backgrounds in the ATLAS detector during the LHC 2012 proton-proton run. Building on published results based on 2011 data, the correlations between background and residual pressure of the beam vacuum are revisited. Ghost charge evolution over 2012 and its role for backgrounds are evaluated. New methods to monitor ghost charge with beam-gas rates are presented and observations of LHC abort gap population by ghost charge are discussed in detail. Fake jets from colliding bunches and from ghost charge are analysed with improved methods, showing that ghost charge in individual radio-frequency buckets of the LHC can be resol…
Underground investigation of extensive air showers spectra at high energy range of cosmic rays and other research in the Pyhäsalmi mine
2020
Abstract High energy particles reaching the Earth’s atmosphere are known as cosmic rays. As a result of interactions with nuclei of air molecules, cosmic rays induce showers of secondary particles, which can be divided into 3 components: electromagnetic, hadronic and muonic components. The Experiment with Multi Muon Array (EMMA), located at the depth of 75 m in the Pyhäsalmi mine in Finland, investigates the muonic component of the Extensive Air Showers (EAS) to deduce the direction, energy, and the mass of the primary cosmic ray particles. In this paper we give a concise description and methodology used by EMMA followed by a brief review of the C14 experiment. Finally, we review the feasib…