Academic literature on the topic 'Capteurs flexibles'
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Journal articles on the topic "Capteurs flexibles"
Le Bihan, F., R. Selmi, J.-C. Fustec, J. Rammal, and M. Harnois. "Initiation à la fabrication additive pour l’électronique flexible : Réalisation de capteurs résistifs par sérigraphie." J3eA 23 (2024): 1013. http://dx.doi.org/10.1051/j3ea/20241013.
Full textRosset, Christian. "La valeur ajoutée de la digitalisation: être plusinformé, connecté et agile." Schweizerische Zeitschrift fur Forstwesen 172, no. 4 (June 30, 2021): 198–204. http://dx.doi.org/10.3188/szf.2021.0198.
Full textDissertations / Theses on the topic "Capteurs flexibles"
Le, Scornec Julien. "Micro-générateurs aéroélectriques flexibles pour l’auto-alimentation de capteurs communicants." Thesis, Nantes, 2020. http://www.theses.fr/2020NANT4039.
Full textThe advent of the Internet of Things has rendered the ambient energy harvesting a major issue for powering communicating microsystems. In this context, this work focuses on the development of a flexible piezoelectric micro-generator able to convert the mechanical energy from low airflows. The objective is to develop autonomous microsystems, or at least to extend their lifespan with energy harvesting. To harvest ambient energy, the flexible micro-generators are made of 3 μm-thick lead zirconate titanate (PZT) thin films encapsulated between polyethylene terephthalate (PET) films. The manufacturing process of the micro-generators has been optimized in order to increase their energy efficiency. Both the optimization of the electrode structure and the geometry of the generator made the maximum harvested power increase by a factor of 625. In this work, to characterize the energy harvesting, the micro-generators were excited with different systems (shaker, traction/compression system and wind tunnel). Thus, wind tunnel tests have shown that it was possible to harvest a power of 38 μW at 10 Hz when the generator was subjected to a low airflow (6 m/s). This generator allowed to power a communicating temperature sensor during several measurement/data transmission cycles
Takpara, Rafatou. "Développement de capteurs piézoélectriques interdigités flexibles pour la caractérisation ultrasonore des revêtements." Thesis, Valenciennes, 2015. http://www.theses.fr/2015VALE0041/document.
Full textThis work deals with the realization of interdigital sensors (IDT for InterDigital Transducer) on piezoelectric substrates. There is a dual challenge since firstly, the aim is to have efficient sensors to generate surface acoustic waves (SAW) in order to characterize the quality of the coatings and structure surfaces. The second objective of this study is to make these IDT sensors flexible so as to adapt to different geometries of structures and to be able to put up with the deformations of structures in use. Typically, piezoelectric materials are rigid and the flexible nature of the materials is often in opposition to the piezoelectric performance of the latter. We developed materials that meet these two requirements: piezoelectricity and flexibility. Finally, we gave greater importance to relatively cheap technologies to develop these sensors because this allows then to consider continuous monitoring (structural health monitoring) by incorporating these sensors permanently on the structures to be tested
Villafuerte, Diaz José Guillermo. "Nanofils de ZnO résistifs synthétisés par dépôt en bain chimique pour capteurs piézoélectriques flexibles." Thesis, Université Grenoble Alpes, 2022. http://www.theses.fr/2022GRALI056.
Full textHighly resistive ZnO NWs are intended for their application as pressure sensors in flexible substrates. To achieve this, it was important to develop the important role of hydrogen- and nitrogen-related defects in ZnO NWs grown by CBD, as it has been extensively studied in this thesis. Chapter 1 details the state-of-the-art of the present thesis and Chapter 2 details the experimental procedures used to develop the different studies of this thesis. In Chapter 3, the metal-like electrical conduction of spontaneously grown ZnO NWs was attributed to a high density of free charge carriers due to hydrogen-related defects (i.e., HBC and VZn-3H acting as shallow donors). Then, Chapter 4 demonstrates the capacity to engineer the ZnO NWs by thermal annealing under an oxygen atmosphere, showing that the density of hydrogen-related defects would decrease at ~300 °C, and the thermal activation of VZn-NO-H (acting as deep acceptor) at ~450 °C would promote an important compensation. Furthermore, the intentional incorporation of Sb dopant atoms in the ZnO NWs bring a novel approach by performing the growths in the low- and high-pH regions, as performed in Chapter 5. Hence, Chapter 6 elucidates the complex modulation between the hydrogen-, nitrogen- and antimony-related defects at the different growth conditions and the different annealing conditions. Particularly, the novel two-step annealing at 300 °C for 4 h and a consecutive 1 h at 450 °C will illustrate the possibility to exo diffuse the hydrogen-donors and thermally activate the VZn-NO-H and Sb-related defects. Finally, Chapter 7 shows the incorporation of these highly resistive ZnO NWs as flexible piezoelectric sensors
DE, PIERI EDSON ROBERTO. "Modelisation et commande de structures flexibles : reduction du modele, placement des capteurs et commande robuste." Paris 6, 1991. http://www.theses.fr/1991PA066611.
Full textSelmene, ep Ben Hassine Nissem. "Etude et développement de capteurs tactiles flexibles à détection harmonique vers la fonctionnalisation sensitive des surfaces." Thesis, Lyon, 2016. http://www.theses.fr/2016LYSEM028/document.
Full textThe advent of sensitive interfaces is promising prospects to the human-machine interaction. We propose a new concept of sensitive flexible surface. Its aim is to study the interaction between electrical signal and resistive and dielectric environment of the support in order to realize an acquisition system providing machine readable information.The technological base is a waveguide on flexible substrate on which the touch creates a reflection at the input port. We have developed a location method as an alternative to the time domain reflectometry (TDR). It is named Harmonic Detection and Location (HDL) and it allows using a narrow band, around 100 MHz, low complexity acquisition system. The concept has been approved using measures on flexible and rigid sensitive surfaces connected to a vector network analyzer (VNA) used as reference. A compact acquisition system based on a Wheatstone bridge associated to a phase detector has been developed. For this purpose, errors characterization and identification work has been done. Electromagnetic interactions between the finger and the waveguide, waveguide imperfections, substrate nature and acquisition system errors’ impact have been studied. This knowledge has provided the possibility to co-develop the hardware and the detection algorithm to demonstrate a location accuracy of 2cm. Fundamental principles of this work provide the possibility of realizing large surface interfaces, with simple connection and conformable, for 3D sensitive objects
Jemai, Brahim. "Contrôle actif de structures flexibles à l'aide de matériaux piezo-électriques : Applications." Ecully, Ecole centrale de Lyon, 1999. http://www.theses.fr/1999ECDL0023.
Full textA given mechanical system is dependant on its environment at the time of its operation. The excitation sources and the connections with its environment makes the system produces adverse effects such as the noises and the vibrations. Such a system behaves according to positive and total natural laws'. Active control aims to act on these laws and makes it possible to confer on the system a behavior with better dynamic performances. With this intention one integrates into the basic structure a set of sensors to measure its vibratory state and a set of actuators to apply a command generated by a controller in order to bring the structure in a state fixed before. In this work, it is a question of studying the active control of light and flexible structures using peizoelectric materials. These structures are abundantly used in aeronautical construction. A fundamental problem arises during the control of such structures : it is the phenomenon of the modal contamination (effet Spillower) which occurs as instabilities
Degryse, Emmanuel. "Etude d'une nouvelle approche pour la conception de capteurs et d'actionneurs pour le contrôle des systèmes flexibles." Compiègne, 2001. http://www.theses.fr/2001COMP1363.
Full textAmestoy, Antoine. "Synthèse de nanohélices hybrides par auto-assemblage de type "bottom up" pour la fabrication de capteurs de déformation flexibles." Thesis, Bordeaux, 2020. http://www.theses.fr/2020BORD0041.
Full textFlexible and biocompatible strain sensors based on nanoparticle (NPs) assemblies show great potential for various future applications, such as electronic skin, flexible touch screens, and robotics. The high sensitivity of such strain sensing devices is due to the exponential dependence of the tunnel resistance on the distance between adjacent NPs, which is altered by the strain. However, the sensitivity, reproducibility and stability of these sensors are affected by variations in thickness, morphology and density of the films during manufacture or during their application. The objective of this work is to develop strain sensors based on assemblies of silica nanohelices covered with conductive metallic NPs or semiconducting metal oxide NPs to overcome these critical aspects. In the first part, gold NPs are synthesized and functionalized with different compositions of insulating ligands and are further grafted on the surface of the nanohelices with a covalent bond. In the second part, transparent semiconducting NPs of antimony-doped tin oxide are synthesized, functionalized and assembled on the surface of nanohelices by electrostatic or covalent interactions. Finally, the various assemblies obtained are deposited by dielectrophoresis between interdigitated electrodes on a flexible substrate. The flexibility, sensitivity and stability properties of the sensors are then characterized by electromechanical measurements coupled with scanning electron microscopy observations
Ganesan, Sivaramakrishnan. "Utilisation de la résonance plasmonique de surface pour la réalisation de capteurs appliqués au domaine phytosanitaire." Thesis, Lille 1, 2020. http://www.theses.fr/2020LIL1I059.
Full textThe overall goal of this study was to develop a portable biological detection system with high sensitivity, accuracy and repeatability to be used in either the phytosanitary or the medical domain. This system is based on the Surface Plasmon Resonance (SPR) physical principle. Such a use of this principle is already achieved but leads to laboratory equipment. The goal here is to democratize its use up to an on field or point of care measurement system. In this context and within the frame of the BIOSENS INTEREG FWVL project, I worked more particularly on several developments around the sensor. From all the existing biosensor technologies, surface plasmon resonance (SPR) sensing technology has received continuous attention due to its advantages of a high-sensitivity, label-free and fast response time. Although the SPR sensing technique being legend in the sensor community, currently the temperature of the sample needs to be carefully maintained and controlled because SPR signal varies with temperature and any change in SPR signal can be interpreted as a biological interaction. This gives a huge challenge in the portable application that is targeted since embedding of a temperature controlled chamber size and energy consuming. A SPR sensor design including 4 SPR channels has been made and the temperature is controlled in real time by using Joule effect. Temperature behavior has been modelled under COMSOL and we experimentally demonstrated that the temperature modulation of SPR channel by Joule effect does not affect the detection scheme. Water was heated by injecting current through the plasmonic layer and the refractive index change of water due to temperature was measured and compared with the theory. We also demonstrated that the temperature of each of the 4 channels can be controlled independently without any thermal crosstalk. In order achieving a more precise monitoring of sample temperature, a temperature sensor was also fabricated on top of the plasmonic layer, allowing the real temperature at the sensor surface to be monitored in real time. This temperature control can so be used either to maintain the temperature of biologic samples or to identify the effect of temperature on biomolecular interactions. On addressing the cost of the sensing tool, a flexible and cheap SPR sensor made on tape has been fabricated and tested. Air and water plasmonic responses were measured using such a "tape sensor". A PDMS prism has already been investigated and combined to the tape sensor making then a very cheap sensing platform
Delabre, Benjamin. "Développement de capteurs flexibles à courants de Foucault : applications à la caractérisation des propriétés électromagnétiques des matériaux et à la détection de défauts par imagerie statique." Thesis, Université Paris-Saclay (ComUE), 2016. http://www.theses.fr/2016SACLS415/document.
Full textThe work of this thesis focuses on the development and the optimization of probes for non-destructive testing (NDT) by Eddy Currents (EC). The manuscript presents several achievements of flexible EC probes engraved on Kapton film. The first part describes the evaluation of the electromagnetic parameters (electrical conductivity σ and magnetic permeability µ) of materials typically encountered in NDT by EC. Conventional methods to estimate σ and μ have been investigated and implemented: it is the four-point probe and the permeameter. However, these methods present practical difficulties relating to the surface condition (paint, corrosion,…) and the sample geometry. Two probes have therefore been designed: the first is composed of a transmitting and a receiving coil in order to evaluate the conductivity of purely conductive materials, and the second is composed of a transmitter coil and a GMR for evaluate the magnetic permeability. Design patterns and experimental results are presented in the manuscript. The second part describes the development of a flexible static EC imager. The imager is a multielement probe composed of 576 receivers arranged in a matrix allowing to inspect the surface of a structure under test without moving the probe relative to the sample surface. The inspection by the static imager provides a pixelated image of the surface under the probe. The imager has been optimized to detect a surface defect of at least 1 mm long of given orientation regardless of its location relative to the receiver coils. The design of the probe and its experimental evaluation are given in the manuscript