Communications – electrical: acoustic wave systems and devices – Testing – monitoring – or calibrating
Patent
1982-03-17
1984-04-03
Farley, Richard A.
Communications, electrical: acoustic wave systems and devices
Testing, monitoring, or calibrating
73 1DV, H04R 2900
Patent
active
044411731
ABSTRACT:
An improved system is disclosed for calibrating acoustic pressure-sensitive transducers, particularly hydrophones, down to frequencies in the sub-Hertz range. A transducer under test and a reference transducer, both electrically connected to a voltage measuring device, are mounted in aligned proximity to each other upon a pivotal rocker arm immersed in a water tank. A cam and follower unit driven by a motor oscillates the rocker arm so that the transducers are moved through a vertical displacement equivalent to the desired fluctuation of hydrostatic pressure. As a result, calibrations down to 0.01 Hz are achieved.
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Navy Technical Disclosure Bulletin, vol. V, No. 4, Apr. 1980, pp. 5-8, Rod A. Bender, "Sea State & Ocean Current Simulator for Sonobuoys".
Beers Robert F.
Farley Richard A.
Hansen Henry
The United States of America as represented by the Secretary of
Vozzo, Jr. Armand M.
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