Sustainability of mobile educational resources in electrical engineering

L'éducation durable (Sterling, 2009) est un enjeu aux multiples dimensions, tant concernant l'impact social et humain, le rôle de l’électronique dans la transition liée aux enjeux climatiques et mondiaux, que des thématiques telles que l'obsolescence matérielle et logicielle. L'utilisation des applications mobiles dans l'enseignement supérieur se développe dans le monde entier dans de nombreuses disciplines telles que l'apprentissage des langues, la physique, le droit, les mathématiques, etc. Les solutions commerciales sont nombreuses, mais deux questions se posent : tout d'abord, quelle place l'enseignant peut-il prendre dans le développement de ces solutions ? Et quelle est la pérennité de ces solutions ? Cet article apporte un retour d'expérience de huit ans avec trois solutions de création d'applications pédagogiques qui ont été comparées et mises en œuvre avec des étudiants de l'enseignement supérieur.Sustainable education is an issue with many dimensions, both concerning the social and human impact, the role of electrical engineering on the transition linked to climate and global issues, as well as themes such as hardware and software obsolescence. The use of mobile applications in higher education is growing worldwide in many disciplines such as language learning, physics, law, mathematics, etc. There are numerous commercial solutions, but two questions arise: first of all, what place can the teacher take in the development of these solutions? And what is the sustainability of these solutions? This article provides eight years of experience feedback with three solutions for creating educational applications that have been compared and implemented with students in higher education

Interface de détection térahertz par imagerie en realite augmentée

Neuvième Conférence Plénière du GDR ONDES les 30 novembre et 1er décembre 2021, au pôle évènementiel de LILLIAD, Université de LilleAfin de pouvoir cartographier des mesures issues d'un capteur térahertz, nous avons développé un banc de test combinant un radar à onde continue à modulation de fréquence (FMCW) couplé à un scanphone qui va permettre de placer en réalité augmentée une grille de mesure a un emplacement voulu. L'architecture réalisée assure une manipulation simple pendant le processus d'acquisition tandis que la visualisation des résultats peut être effectuée en direct directement avec un smartphone, avec une vue 3D en réalité augmentée superposée en direct

Blackbody source-based terahertz nondestructive testing with augmented reality

We present original work on non-destructive testing with an imaging solution combining a sensor that can measure the millimeter-wave radiation of a black body at temperatures between 290-400°K and a portable solution based on augmented reality with a smartphone. This handy portable solution makes it possible to do away with mechanical scanning systems which are heavy and slow, and therefore may be suitable for civil engineering detection or imaging applications, or in the field of aeronautics

Pulsed Frequency Shifted Feedback Laser for Accurate Long Distance Measurements: Beat Order Determination

Long-distance measurements (10 m - 1000 m) with an accuracy of 10-7 is a challenge for many applications. We show that it is achievable with Frequency Shifted Feedback (FSF) laser interferometry technique, provided that the determination of the radio frequency beat order be made without ambiguity and on a time scale compatible with atmospheric applications. Using the pulsed-FSF laser that we developed for laser guide star application, we propose and test, up to 240 m, a simple method for measuring the beat order in real time. The moving-comb and Yatsenko models are also discussed. The first of these models fails to interpret our long-distance interferometry results. We show that the accuracy of long-distance measurements depends primarily on the stabilization of the acoustic frequency of the modulator

HOBIT - un Concept Innovant pour le Transformation des Pratiques Pédagogiques

International audienceHOBIT désigne un nouveau concept destiné à transformer les pratiques pédagogiques concernant l’enseignement de l’optique. Sur une table technique interactive, il permet de placer des composants optiques factices et d’agir sur leurs réglages et de visualiser en temps réel non seulement le phénomène optique résultant mais aussi de bénéficier d'un soutien pédagogique en faisant appel à la réalité augmentée. Nous mettrons l’accent sur la notion de rupture pédagogique qui peut être atteinte avec ce nouveau concept à travers quelques exemples choisis

Terahertz Nondestructive Testing with Ultra-Wideband FMCW Radar

This paper presents the development, performance, integration, and implementation of a 150 GHz FMCW radar based on a homodyne harmonic mixing scheme for noncontact, nondestructive testing. This system offers high-dynamic-range measurement capabilities up to 100 dB and measurement rates up to 7.62 kHz. Such interesting characteristics make this system attractive for imaging applications or contactless sensing. Numerous samples of different materials and geometries were imaged by taking advantage of the radar’s performance. By taking into account the nonionizing capability of the system, new applicative fields such as food industry and pharmaceutical packaging were explored

Single-scan multiplane phase retrieval with a radiation of terahertz quantum cascade laser

Terahertz phase retrieval from a set of axially separated diffractive intensity distributions is a promising single-beam computational imaging technique that ensures the obtention of high spatial resolutions and phase wavefronts, but remains restricted by time-consuming data acquisition processes. In this work, we have adopted an approach, relying on the radiation of a quantum cascade laser and the implementation of an express single-scan measurement of intensity distributions through the continuous on-the-go displacement of a high-sensitivity antenna-coupled microbolometer sensor array. In addition to the simplicity of this practical implementation and the minimization of measurement times, such an approach overcomes the problem of preliminary optimal selections of transverse intensity distributions used in the iterative phase retrieval algorithm and guarantees the required data diversity for high-quality wavefront reconstruction

Tunable ultra-fast infrared generation in a gas-filled hollow core capillary by a four-wave mixing process: erratum

This erratum reports corrections to the temporal axes in Figs. 12 and 13 of J. Opt. Soc. Am. B 39, 662 (2022)JOBPDE0740-322410.1364/JOSAB.444574

Light Curves and Colors of the Ejecta from Dimorphos after the DART Impact

On 26 September 2022 the Double Asteroid Redirection Test (DART) spacecraft impacted Dimorphos, a satellite of the asteroid 65803 Didymos. Because it is a binary system, it is possible to determine how much the orbit of the satellite changed, as part of a test of what is necessary to deflect an asteroid that might threaten Earth with an impact. In nominal cases, pre-impact predictions of the orbital period reduction ranged from ~8.8 - 17.2 minutes. Here we report optical observations of Dimorphos before, during and after the impact, from a network of citizen science telescopes across the world. We find a maximum brightening of 2.29 $\pm$ 0.14 mag upon impact. Didymos fades back to its pre-impact brightness over the course of 23.7 $\pm$ 0.7 days. We estimate lower limits on the mass contained in the ejecta, which was 0.3 - 0.5% Dimorphos' mass depending on the dust size. We also observe a reddening of the ejecta upon impact.Comment: Accepted by Natur