Dr. Elie Lefeuvre Profile

Dr. Elie Lefeuvre

at Institut National des Sciences Appliquées de Lyon

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Author

Publications (4)

Proceedings Article | 15 March 2006 Paper

Ultrasonic wireless health monitoring

Lionel Petit, Elie Lefeuvre, Daniel Guyomar, Claude Richard, Philippe Guy, Kaori Yuse, Thomas Monnier

Proceedings Volume 6177, 617713 (2006) https://doi.org/10.1117/12.661130

KEYWORDS: Receivers, Sensors, Energy harvesting, Photonic integrated circuits, Transmitters, Signal detection, Capacitors, Damage detection, Data processing, Wavelets

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The integration of autonomous wireless elements in health monitoring network increases the reliability by suppressing power supplies and data transmission wiring. Micro-power piezoelectric generators are an attractive alternative to primary batteries which are limited by a finite amount of energy, a limited capacity retention and a short shelf life (few years). Our goal is to implement such an energy harvesting system for powering a single AWT (Autonomous Wireless Transmitter) using our SSH (Synchronized Switch Harvesting) method. Based on a non linear process of the piezoelement voltage, this SSH method optimizes the energy extraction from the mechanical vibrations. This AWT has two main functions : The generation of an identifier code by RF transmission to the central receiver and the Lamb wave generation for the health monitoring of the host structure. A damage index is derived from the variation between the transmitted wave spectrum and a reference spectrum. The same piezoelements are used for the energy harvesting function and the Lamb wave generation, thus reducing mass and cost. A micro-controller drives the energy balance and synchronizes the functions. Such an autonomous transmitter has been evaluated on a 300x50x2 mm³ composite cantilever beam. Four 33x11x0.3 mm³ piezoelements are used for the energy harvesting and for the wave lamb generation. A piezoelectric sensor is placed at the free end of the beam to track the transmitted Lamb wave. In this configuration, the needed energy for the RF emission is 0.1 mJ for a 1 byte-information and the Lamb wave emission requires less than 0.1mJ. The AWT can harvested an energy quantity of approximately 20 mJ (for a 1.5 Mpa lateral stress) with a 470 μF storage capacitor. This corresponds to a power density near to 6mW/cm³. The experimental AWT energy abilities are presented and the damage detection process is discussed. Finally, some envisaged solutions are introduced for the implementation of the required data processing into an autonomous wireless receiver, in terms of reduction of the energy and memory costs.

Proceedings Article | 29 July 2004 Paper

A broadband semi passive piezoelectric technique for structural damping

Lionel Petit, Elie Lefeuvre, Claude Richard, Daniel Guyomar

Proceedings Volume 5386, (2004) https://doi.org/10.1117/12.532716

KEYWORDS: Switches, Signal attenuation, Switching, Copper, Ferroelectric materials, Device simulation, Sensors, Neodymium, Actuators, Control systems

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Proceedings Article | 26 July 2004 Paper

High-performance piezoelectric vibration energy reclamation

Elie Lefeuvre, Adrien Badel, Claude Richard, Daniel Guyomar

Proceedings Volume 5390, (2004) https://doi.org/10.1117/12.532709

KEYWORDS: Energy harvesting, Resistance, Switches, Ferroelectric materials, Capacitors, Bridges, Sensors, Nonlinear dynamics, Systems modeling, Transducers

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Proceedings Article | 11 February 2003 Paper

New UV detectors for solar observations

Jean-Francois Hochedez, Udo Schuehle, Jose Pau, Jose Alvarez, Olivier Hainaut, Thierry Appourchaux, F. Auret, Andrei Belsky, Philippe Bergonzo, M. Castex, A. Deneuville, Pierre Dhez, Bernhard Fleck, Ken Haenen, Mourad Idir, Jean Paul Kleider, Elie Lefeuvre, Philippe Lemaire, E. Monroy, P. Muret, Elias Munoz, Milos Nesladek, Franck Omnes, Emanuele Pace, Anthony Peacock, Chris Van Hoof

Proceedings Volume 4853, (2003) https://doi.org/10.1117/12.460367

KEYWORDS: Sensors, Ultraviolet radiation, Diamond, Sun, Extreme ultraviolet, Imaging systems, Ultraviolet detectors, Quantum efficiency, Silicon, Charge-coupled devices

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