Communications – electrical: acoustic wave systems and devices – Signal transducers – Underwater type
Patent
1986-04-07
1988-12-06
Jordan, Charles T.
Communications, electrical: acoustic wave systems and devices
Signal transducers
Underwater type
367157, 310337, 310800, H04R 1700
Patent
active
047899719
ABSTRACT:
An acoustically transparent voided, polyvinylidene fluoride (PVDF) hydrope made of material whose impedance matches the characteristic acoustic impedance (.rho.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.
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McGrath John C.
Moffett Mark B.
Powers James M.
Eldred John W.
Jordan Charles T.
Lall Prithvi C.
McGill Arthur A.
McGowan Michael J.
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