Ultrasonic characterisation of complex media

Ultrasonic bulk or guided waves allow the properties and geometry of a structure to be characterised. The acoustic signatures of complex media are rich and their relationships with structural properties often unknown. New methods are being developed for investigating materials such as innovative polymers and composites, objects from the artistic, archaeological or architectural heritage as well as for NDE of structures including bonding layers, SHM, process monitoring or elastography applications.

Tools and methods

Pulse-echo and transmission measurements in frequency ranges from a few tens of kHz to several hundred MHz - acoustic microscopy – electrical impedance spectroscopy – immersion, contact or airborne setups - spatial-temporal data analysis - analytical and numerical models - inverse problems, …

Development of specific methods:

Reverberation: Sabine's law adaptation discus OR3 caracterisation de plaque metallique

Evaluation of the area of a polymer layer deposited on a metallic plate.

Search for microstructures and acoustic signatures

Greman's activities, linked to cultural heritage
Acoustic microscopy V(z) signature to detect interface defects in metallic multilayer structures.


Cultural heritage-related activities

Characterisation of a 12th century chalice Characterisation of a 12th century chalice (thickness and composition).

Characterisation of a 12th century chalice (thickness and composition).