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Ultrasonic devices and characterization

DISCUS team’s activities are related to ultrasonic applications, starting from the functional characterisation of piezoelectric materials integrated in ultrasonic devices up to their use in new methods and systems for the characterisation of complex media, with an emphasis on ultrasonic transducers.

The team has acquired technical and theoretical expertise on ultrasonic transducers, based on either piezoelectric or capacitive effects. This know-how is used in order to develop innovative devices such as high frequency probes used in high resolution medical imaging and high-density integrated arrays for different applications. Particularly, acoustic microsystems (cMUT or pMUT) are developed for new investigation modalities, characterization of complex media, NDE in harsh environments, or for imaging. Contribution of phononic crystals and metamaterials is also being studied. Ultrasonic waves being one of the most interesting ways to non-destructively explore complex structures and media, innovative methods are being developed for a wide range of applications at different scales from a few hundred nanometres to several tens of millimetres. The data from such measurements is extremely rich and if it answers many practical problems, it also addresses fundamental issues of acoustic phenomena.

DISCUS team focuses on three research operations:

Functional characterization of piezoelectric materials

Measurments of functional properties of new piezoelectric materials in order to design efficient devices.

Ultrasonic transducers and sensors

High frequency annular array (>30 MHz) based on a piezoelectric copolymer (PVDF-TrFE) on Silicon mounted on a PCB Piezoelectric and capacitive transducers for biomedical imaging, therapy non destructive evaluation and SAW.

Ultrasonic characterization of complex media

caracterisation structure d'un calice Ultrasonic bulk or guided waves are used to deduce properties and geometry of various structures.

DISCUS Projects


Broadband Extraordinary Acoustic Transmission for super-resolution imaging
ANR Project 2021
Coordinator : GREMAN
Partner : Applied Solid State Laboratory (Hokkaido - Japan)


Wireless acoustic energy harvesting using a micro-device
APR IA 2021
Coordinator : GREMAN
Partners : IBrain (University of Tours, INSERM U1253)


Personalized Focused Ultrasound Surgery of Localized Prostate Cancer
ANR-RHU 2017
Subcontractor for LabTau Lyon : Development of CMUT probe for therapy
Partners : Vermon


SimUlation of rotomolded poLymer viscosity for HYdrogen by ultraSonic testing method
ANR 2021
Coordinator : GREMAN
Partners : GREMAN (INSA CVL), PIMM (ENSAM Paris), CEA Le Ripault, RAIGI


Development of an innovative and integrated intraoral probe for the diagnosis of periodontal disease
FUI AAP 25 2019
Coordinator : Carestream Dental
Partners : GREMAN, IBrain, CHRU Tours, CIC-IT Tours, Pyxalis


Measuring physical properties of gases using resonant mems for chemical detection in harsh environments
ANR 2022
Coordinator : IMS Bordeaux