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AssigneeOffice National d'Etudes et de Recherches Aerospatiales
InventorsGuillaume AOUST, Béatrice BOURGETEAU, Raphaël LEVY, Olivier LE TRAON, Denis JANIAUD
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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.
Mechanical resonator (100), produced in a flat plate of a material of thickness T′, comprising a shared portion (2′) on which is embedded at least one parallelepipedic prong (1′) of length Lb′, of width Wb′, said length Lb′ and width Wb′ being measured parallel to the plate, said prong having a resonance mode with bending in a plane of the plate at a frequency f at which it emits an acoustic wave of wavelength λ in a fluid, electrodes being arranged on said prong,
Dependencies are inferred from the claim text.