Patent ID: 8780674

Claim:
An acoustic wave transducer having a bandwidth, comprising: at least one electroacoustic motor; a horn having an inner wall and an outer wall; a counterweight; and a hollow housing having an inner wall and an outer wall and at least one acoustic opening, wherein said at least one motor is connected to the horn and to the counterweight, according to an axis, said motor being capable of exciting the horn at about at least one acoustic resonance frequency f, said housing being connected to the counterweight and surrounding the at least one motor and the horn, the outer wall of the horn facing an acoustic opening of the housing, and a space between the inner wall of the housing and the inner wall of the horn forming a cavity that contains a fluid, said transducer comprises an acoustic attenuator integral with the outer wall of the housing in order to attenuate at least one of the emission or reception acoustic waves at the frequency f in at least one direction transverse to the axis, and wherein said acoustic attenuator comprises an absorbing sheath fixed to the outer wall of the housing and capable of absorbing acoustic waves at the frequency f in at least one direction transverse to the axis, said acoustic attenuator further comprising a diffraction grating formed at the surface of the absorbing sheath, said diffraction grating being capable of diffracting acoustic waves in the transducer bandwidth.