Centre National De La Recherche Scientifique

Michelin Recherche Et Technique S.a.

Temex Sas

Compagnie Generale Des Etablissements Michelin

Tdk Electronics Ag

William Steichen

Sylvain Ballandras

Lionel Fagot-Revurat

Jérémy Masson

Jeremy Masson

Sylvain Jean Ballandras

Control of running conditions, and particularly physical parameters of tires are recommended to increase automobile safety. A sensor according to the invention is used to determine various factors such as the temperature or pressure of tires. The sensor is a hybrid resonant passive structure that may be integrated in the vehicle ground connection, and particularly in the rubber of the tire when it is manufactured.

Hybrid resonant structure to verify parameters of a tire

A bulk wave acoustic resonant structure which is in accordance with the invention allows the difficulties encountered at high frequency, the impossibility of working at low frequency on simple structures and the absence of an adequate coupling level to be overcome. The invention therefore proposes the use of an additional layer of material which covers the upper electrode of a piezoelectric transducer in order to localize the position of maximum intensity of the dynamic stress close to the centre of the piezoelectric layer through the effect of propagation. The structure that is in accordance with the invention may be associated with Bragg mirrors and various uses are presented.

Hybrid resonant structure

Growing community of inventors

Roquefort-les-Pins, France

William Steichen