Communications – electrical: acoustic wave systems and devices – Signal transducers – Underwater type
Patent
1997-07-17
1998-11-24
Pihulic, Daniel T.
Communications, electrical: acoustic wave systems and devices
Signal transducers
Underwater type
G01V 1157
Patent
active
058417370
ABSTRACT:
An impulsive acoustic radiation source includes an enclosure disposed about an impulse generator to control the generated acoustic spectrum. In some implementations, the impulse source includes electrically nonconducting materials disposed so as to provide a compact means to complete the electrical circuit. In certain implementations, the impulse source includes a restrictor that mechanically guides a "cavity" produced by the pulsed electrical discharge. In other implementations, multiple impulse sources are disposed within an enclosure having walls or other means to define an enclosure for each specific source. Arrangements of multiple impulse sources connected in series and driven by a single circuit and having a reflector disposed about the impulse source or sources are disclosed. In certain implementations, the impulse source is initiated by a small energy electrical discharge that, in a particularly favored implementation, employs an electrode configuration having an initiator electrode in addition to the main electrodes. Also, an impulse source located adjacent to a pulse power subsystem is disclosed.
REFERENCES:
patent: 4651311 (1987-03-01), Owen et al.
patent: 4734894 (1988-03-01), Cannelli et al.
Barger et al., "The air gun impulsive underwater transducer", J. Acoust. Soc. Am. 68(4), pp. 1038-1045 (Oct. 1980).
Cathignol et al., "Influence of Water Conductivity on the Efficiency and The Reproductivity of Electrohydraulic Shock Wave Generation", Ultrasound in Medicine and Biology, vol. 17, No. 8 (1991).
Caulfield et al., "Improvements in the Continuous Seismic Profiler", Manuscript from Woods Hole Oceanographic Institution, Woods Hole, MA, Contribution No. 1494 (received by editor May, 1964).
Cole, "Underwater Explosions" Table of Contents, Dover Publications, New York, NY (1948).
EG&G Marine Instruments Brochure, Bulletin 2-100A (1977).
Frungel, "High Speed Pulse Technology", Capacitor Discharges-Magnetohydrodynamics-X-Rays-Ultrasonics vol. I, Academic Press (1965).
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