Helmholtz resonator type marine signal

Details Helmholtz resonator type marine signal Helmholtz resonator type marine signal

2008-04-22

2008-04-22

Smith, R. A. (Department: 2859)

Signals and indicators

Nautical

C116S13700R, C181S149000, C181S192000, C381S423000

Reexamination Certificate

active

07360499

ABSTRACT:
A power efficient, acoustical Helmholtz resonator foghorn including a plurality of electrical emitters, some of which are redundant, arrayed at one end of a blocked tube with a plurality of exhaust ports located therein surrounded by a standoff tubular member. The foghorn tuned to provide a high pitch thus providing a compact horn having an acoustical path capable of producing an exceptional wavelength in a generally concentric horizontal sound propagation the horn configurable for use as either a one-half mile or two mile marine navigational aid for offshore structures, buoys, and the like.

REFERENCES:
patent: 3153783 (1964-10-01), Whitehead
patent: 4796009 (1989-01-01), Biersach
patent: 4908601 (1990-03-01), Howze
patent: 5146508 (1992-09-01), Bader et al.
patent: 5321388 (1994-06-01), Biersach
patent: 5726396 (1998-03-01), Erath
AB 26 Audiobeam ½ Mile Fog Signal,Web Site of Tideland Signal Corp. (www.tidelandsignal.com) USA.
SOLA ET 500 Sound Emitter, brochure, Sola Communications, Inc. USA.

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