Communications: electrical – Selective – Having indication or alarm
Patent
1977-08-08
1979-01-16
Tudor, Harold J.
Communications: electrical
Selective
Having indication or alarm
340 8LF, H04B 1300
Patent
active
041351428
ABSTRACT:
An improvement for a transducer provides an improved operational charactetic for the transmission and reception of acoustic energy in a liquid medium. A rigid shell having an open end and a closed end is vertically oriented to contain a transducer disposed in a portion of the liquid medium. Inside the shell and in direct contact with the surface of the portion of liquid is a gas filled chamber. The transducer and chamber acoustically cooperate to heterodyne transmitted or received acoustic energy. Difference and sum frequencies optionally are selected for data processing. The frequencies of the heterodyned signals are changed by changing the dimensions of the gas filled chamber. Thus, the relatively small transducer is capable of broadband and low frequency transmission.
REFERENCES:
patent: 1500243 (1924-07-01), Hammond, Jr.
patent: 2689947 (1954-09-01), Fry
patent: 2867802 (1959-01-01), Lindenblad
patent: 2939106 (1960-05-01), Mason
patent: 3048816 (1962-08-01), Lubnow
patent: 3219970 (1965-11-01), Sims
Duykers Ludwig R.
Percy Joseph L.
Johnston Ervin F.
Keough Thomas Glenn
Sciascia Richard S.
The United States of America as represented by the Secretary of
Tudor Harold J.
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