Mechanical resonator optimised to operate in a fluid

US10809230B2 · kind B2 · utility

Assignee

• OFFICE NATIONAL D'ETUDES ET DE RECHERCHES AÉROSPATIALES · FR

Inventors

• Guillaume AOUST · Massy, FR
• Béatrice Bourgeteau · Issy-les-Moulineaux, FR
• Raphael Levy · Netanya, IL
• Olivier Le Traon · Vauhallan, FR
• Denis Janiaud · Les Ulis, FR

Key dates

• Filing date: Jul 6, 2017
• Grant date: Oct 20, 2020
• Expiry date: Jul 6, 2037

Classification

• Technology area (CPC G): Physics
• CPC primary: G01N2291/0427
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A resonator includes a prong of which the width between edges is close to λ/2. The pressure variation at one edge is then in phase opposition with that at the other edge. Acoustic coupling with an incident wave having the wavelength is thus improved. The ratio between the width between edges and the height of the prong is chosen so that only the fundamental mode with bending oscillation of the prong is present. It to prongs of a tuning fork embedded in a solid shared base optimized to contain the energy in the tuning fork while avoiding energy losses in the support. Finally, the tuning fork is advantageously combined with a unit for containing acoustic energy including a rigid reflecting screen.