Societal needs : Objectives : OR « Optical investigation of vibrations »

OR « Optical investigation of vibrations »
Societal needs :
Industrial needs for vibration diagnostic, structure health monitoring and
validation of numerical and analytical modeling.
Objectives :
Development of optical digital holographic techniques, with full field
and contactless properties for evaluation of vibrating fields in transient of
stationary regimes.
Applications of the techniques to fault detection and identification in
vibration mechanics.
Optical NDT
Structure
behaviour
OR « Optical investigation of vibrations »
Scientific problem
Advanced Methods for vibrations
Development of new measurement methods based on digital holographic
techniques and multi-sensitivity
Multi-chromatic architecture
Digital color holography
Development of specific algorithms
Metrological characterization of holographic sensors
Hybrid methods for transient deformations
2D encoding
1-2-3D Optical Metrology
Applications in acoustics : vibrations of clarinet pipe, calibration of microphones,
vibrations of cylinders, vibrations of heterogeneous structures
Modeling-experiment comparison
OR « Optical investigation of vibrations »
Background to OR
In LAUM
1997 : Equipment of optical lab in ENSIM
Under way : double cavity pulsed laser source
Current OR OIV (Director : P. Picart) :
Permanent staff : Prof. P. Picart, Prof. J. C. Pascal
Technicians : J. Blondeau, E. Brasseur
PhD students : J. Leval (sept. 2003-nov. 2006)
Collaboration : J.P. Boileau, F. Piquet, D. Mounier
Initiation and propagation
of cracks analysed in 3D
OR « Optical investigation of vibrations »
Default of dome
mode (16kHz)
Context (continued)
Regional level
Pole of competences NDT Pays de Loire under way
Collaboration with GCSM and EMN
‘COI’ Masters (UMaine-UAngers-ESEO-EMN)
National and international level
French GDR « Mesure de champ et identification en mécanique du
solide »
Collaboration with ONERA (Lille), LUSIG (Brest)
European network « LAVINYA » (LAser VIbrometry Network :
sYstems and Applications )
OR « Optical investigation of vibrations »
Results of OR (2003-2005)
Industrial collaboration
Harmann (Chateau du Loir, loudspeakers)
CFGomma (Rennes, elastomere structures)
Publications
1. P. Picart, E. Moisson, D. Mounier, Applied Optics, Vol. 42, N°11, 1947-1957
(2003)
2. P. Picart, J. Leval, D. Mounier, S. Gougeon, Optics Letters, Vol. 28, N°20, 19001902 (2003)
3. P. Picart, B. Diouf, E. Lolive, J.-M. Berthelot, Optical Engineering, Vol. 43, N°5,
1169-1176 (2004)
4. P. Picart, J. Leval, D. Mounier, S. Gougeon, Applied Optics, Vol. 44, N°3, 337-343
(2005).
5. P. Picart, J. Leval, J.P. Boileau, J.C. Pascal, Applied Optics, Vol. 44, N°27 (2005).