Dr. Philippe Guy Profile

Dr. Philippe Guy

Associate Professor at Institut National des Sciences Appliquées de Lyon

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Publications (5)

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 | 1 August 2003 Paper

Guided-wave interaction with complex delaminations: application to damage detection in composite structures

Philippe Guy, Yves Jayet, Laurent Goujon

Proceedings Volume 5047, (2003) https://doi.org/10.1117/12.483926

KEYWORDS: Composites, Waveguides, Wave propagation, Finite element methods, Sensors, Receivers, Wave plates, Damage detection, Ultrasonics, Interfaces

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Proceedings Article | 16 August 2001 Paper

Damage assessment in smart composite structures: the DAMASCOS program

S. Gareth Pierce, Fengzhong Dong, Kathryn Atherton, Brian Culshaw, Keith Worden, Graeme Manson, Thomas Monnier, Philippe Guy, Jean-Claude Baboux, J. Assad, Emmanuel Moulin, Sebastien Grondel, Christophe Delebarre, V. Agostini, Pier Delsanto, I. Genesio, E. Mino, Christian Boller

Proceedings Volume 4327, (2001) https://doi.org/10.1117/12.436534

KEYWORDS: Transducers, Wave propagation, Composites, Signal processing, Ultrasonics, Ferroelectric materials, Sensors, Wave plates, Associative arrays, Visualization

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Proceedings Article | 24 August 2000 Paper

Health monitoring of smart composite structures using ultrasonic guided waves

Thomas Monnier, Philippe Guy, Yves Jayet, Jean-Claude Baboux, Michelle Salvia

Proceedings Volume 4073, (2000) https://doi.org/10.1117/12.396396

KEYWORDS: Sensors, Ultrasonics, Composites, Wave propagation, Waveguides, Receivers, Wave plates, Nondestructive evaluation, Velocity measurements, Phase shifts

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Proceedings Article | 22 June 2000 Paper

Long-term stability of normal condition data for novelty detection

Graeme Manson, S. Gareth Pierce, Keith Worden, Thomas Monnier, Philippe Guy, Kathryn Atherton

Proceedings Volume 3985, (2000) https://doi.org/10.1117/12.388835

KEYWORDS: Temperature metrology, Composites, Associative arrays, Diagnostics, Damage detection, Mahalanobis distance, Statistical analysis, Inspection, Visualization, Principal component analysis

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