Broadband, acoustically transparent, nonresonant PVDF hydrophone

摘要

An acoustically transparent voided, polyvinylidene fluoride (PVDF) hydrophone made of material whose impedance matches the characteristic acoustic impedance (&rgr;c) of sea water, having drastically reduced diffraction and resonance effects. The frequency response is thus flat at frequencies less than one-half elastic wavelength in the PVDF material. An array of such hydrophones in front of a projector saves space without affecting projector performance.