Communications – electrical: acoustic wave systems and devices – Receiver circuitry
Patent
1991-12-06
1992-11-17
Pihulic, Daniel T.
Communications, electrical: acoustic wave systems and devices
Receiver circuitry
367178, 367901, H04R 1500
Patent
active
051649195
ABSTRACT:
A sonar sensor comprising a substantially non-corrodible housing and a fluidic gainblock disposed therein. In addition, one or more fluid-filled laminar proportional amplifiers are arranged either in series or in parallel and contained within the fluidic gainblock. Means are provided to produce a jet within each laminar proportional amplifier, which is then modulated by incoming acoustic signals. The pressure caused by diverting the jet from its equilibrium path is proportional to, but greater than, the incoming acoustic signal. Hydrophones are used to convert the amplified acoustic signal into an electrical signal. In one embodiment, the fluidic gainblock is free-flooded and open to the liquid environment in which it is used, obviating the need for pressure equalization. In another embodiment, the fluidic gainblock is provided with filtering means for prevent the accumulation of sediment within the cavities making up the laminar proportional amplifiers. In yet another embodiment, the fluidic gainblock is a closed-system which recirculates its fluid supply, increasing the sensor's operating life and isolating the laminar proportional amplifiers therein.
REFERENCES:
patent: 4102075 (1978-07-01), Wagner et al.
patent: 4964100 (1990-10-01), Srour et al.
patent: 4970704 (1990-11-01), Kelly
Joyce, J. W., "Design Guide for Fluidic Laminar Proportional Amplifiers and aminar Jet Angular Rate Sensor," Harry Diamond Laboratories, HDL-SR-84-6 (1984).
Joyce James W.
Scanlon Michael
Srour Nassy
Tenney Stephen M.
Elbaum Saul
Pihulic Daniel T.
Shapiro Jason M.
United States of America as represented by the Secretary of the
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