Mr. Jean-Pierre Chambard Profile

Jean-Pierre Chambard

Associate Director at Holo3

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Publications (6)

Proceedings Article | 16 July 2021 Paper

Deflectometry based on light-field imaging

A. Meguenani, K. Tout, S. Kohler, S. Bazeille, J.-P. Chambard, C. Cudel

Proceedings Volume 11794, 1179408 (2021) https://doi.org/10.1117/12.2588988

KEYWORDS: Deflectometry, Cameras, Defect detection, System integration, Reflectivity, Imaging systems

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Proceedings Article | 16 July 2019 Paper

Deflectometry based inline inspection of linearly moving plastic parts

Anis Meguenani, Jean-Pierre Chambard, Yvan Maillot, Christophe Cudel

Proceedings Volume 11172, 111720V (2019) https://doi.org/10.1117/12.2521721

KEYWORDS: Cameras, Light sources, Calibration, Inspection, Deflectometry, Defect detection, 3D image reconstruction, Sensors

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Proceedings Article | 19 July 2007 Paper

Digitization of art pieces based on 3D, colour and texture parameters

Jean-Pierre Chambard, Vincent Chalvidan, Mohammed Tazeroualti, Frédéric Larue, Jean-Michel Dischler, Virginie Vurpillot, Anne-Claire Legrand

Proceedings Volume 6618, 66180C (2007) https://doi.org/10.1117/12.725975

KEYWORDS: Light sources and illumination, Calibration, 3D metrology, Clouds, Cameras, Sensors, Reflectivity, Visualization, 3D scanning, Structured light

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Proceedings Article | 16 July 2007 Paper

Defect detection of wall paintings in the Château de Versailles using TV-holography and IR thermography

Jean-Pierre Chambard, Alain Roche

Proceedings Volume 6618, 66180Y (2007) https://doi.org/10.1117/12.725875

KEYWORDS: Thermography, Holography, Defect detection, Radiation thermography, Acoustics, Inspection, Process control, Nondestructive evaluation, Calibration, Speckle interferometry

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Proceedings Article | 22 June 2004 Paper

Holographic vibration analysis of turbocharger turbine wheel instruction for use and benefit

Jean-Pierre Chambard, Denis Thouvenin

Proceedings Volume 5503, (2004) https://doi.org/10.1117/12.579453

KEYWORDS: Holography, Vibrometry, Optical design, Mechanical engineering, Failure analysis, Finite element methods, Data modeling, Continuous wave operation, Digital recording, Product engineering

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Since the early 1990's, holography has been used worldwide to study the vibration of mechanical parts at the design stage. The so-called <<time average>> technique on holographic plates was able to give accurate information on the vibration modes of structures. TV-Holography has simplified the data capture, and also has the ability to easily produce amplitude and phase maps. This optical method is a powerful tool for vibration analysis but it needs to be used carefully to gain the full benefit of the data recorded. Then several types of analysis of these data may bring to the mechanical designer key information for the future life of the designed mechanical part. In this paper, we present a complete vibration analysis of a turbocharger turbine wheel, including the two main following points: the holographic recording method and the data post-processing that is done by the vibration experts. Concerning the data recording we will emphasize the experimental conditions that lead to data that are useful for the mechanical engineer: wheel preparation, wheel boundary conditions, method of excitation, geometrical conditions, tests complementary to the holographic recording. Experimental results are reported, showing the effect of the experimental conditions on the eigenfrequencies, eigemodes and damping factor. Concerning High Cycle Fatigue (HCF) on turbine blades of turbochargers, Holography is of gret help in two instances, predictive behavior at design stage and field failures analysis. For the first task, Holography confirms/refines the 3 or 4 first modes predicted by FEA models, it gives the high order modes not predictable by models (especially coupled inducer/backdisc modes) and also the damping factors that are not accurately predicted. Those data are then fed into an "Harmonic Analysis" which allows the prediction of a forced response and, subsequently, an answer about robustness with respect to HCF. For the second task, Holography provides accurate nodal lines which can be easily correlated with location of field cracks or fractures. A Campbell diagram can be used to identify the order of the aero excitation responsible for the failure. Corrective actions to the product design or recommendations for speed limit can then be taken accordingly.

Proceedings Article | 22 May 2000 Paper

Structural intensity measurements using 25-Hz TV-holography recording

Jean Chambard, Vincent Chalvidan, Xavier Carniel, Jean-Claude Pascal

Proceedings Volume 4072, (2000) https://doi.org/10.1117/12.386735

KEYWORDS: Data processing, Wave plates, Pulsed laser operation, Holography, Sensors, Laser optics, Software development, Head, Vibrometry, Laser processing

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