Centre National De La Recherche Scientifique

Sorbonne Université

Université De Lille

Ecole Centrale De Lille

Centrale Lille Institut

Yncrea Hauts De France

Universite Polytechnique Des Hauts De France

Jean-Louis Pierre Thomas

Michaël Aymeric Baudoin

Antoine Jean-Pierre Riaud

Mathias Fink

Mickaël Tanter

Olivier Khalil Bou Matar-Lacaze

Michaël Aymeric Cyril Baudoin

Olivier Khalil Nizar Bou Matar-Lacaze

Antoine Jean-Pierre René Riaud

Antoine Riaud

Michaël Baudoin

Olivier Bou Matar

Electroacoustic device having a transducer including a piezoelectric substrate, first and second electrodes of inverse polarity having respective first and second tracks provided on said substrate, the first and second tracks spiraling around a same center (C), the transducer being configured for generating a swirling ultrasonic surface wave in the substrate.

Acoustic tweezers

Electroacoustic device that includes a body, an electrode to be electrically powered, named hot electrode, and an electrode to be electrically grounded, named ground electrode. The body includes a piezoelectric part or the electroacoustic device further including a piezoelectric part different from the body. The hot electrode includes a hot track spiraling around a spiral axis. The radial step between two consecutive coils of the hot track decreasing radially from the spiral axis. The hot electrode and the ground electrode are arranged on the piezoelectric part such as to define a wave transducer configured to generate a focalised ultrasonic vortex propagating in the body and/or, when a fluid medium is acoustically coupled with the electroacoustic device, in the fluid medium.

The invention concerns a method for focusing acoustic waves useful for obtaining an image of a field to be observed in a dissipative heterogeneous medium () around which acoustic transducers (T&#x2013;Tn, T'&#x2013;T&#x2032;m) forming an imaging network and a target network. The method consists in following a training step during which pulse responses from the medium are measured between each transducer (Ti) of the imaging network () and several transducers (Tj) of the target network (); deducing therefrom reference signals to be emitted by the transducers of the imaging network to produce a focused acoustic pulse in each transducer of the target network, then cumulatively, in determining reference signals to be emitted to focus an acoustic pulse on predetermined points in the medium. Said reference signals are stored and used subsequently to generate an acoustic image of the medium.

Method and non-invasive device for focusing acoustic waves

A method of generating photons by sonoluminescence, from a gas bubble trapped in a liquid reservoir () by a standing ultrasound wave. An ultrasound impulse emitted by high-frequency transducers (T&#x2013;T) is superposed on the standing wave, the high-frequency transducers being pre-focused onto the gas bubble and pre-synchronized with the light emissions from the gas bubble during an initial training stage in which said focusing and said synchronization are optimized.

Method for generating photons by sonoluminescence

Growing community of inventors

Montgeron, France

Jean-Louis Pierre Thomas