Very low frequency hydrophone calibration

Communications – electrical: acoustic wave systems and devices – Testing – monitoring – or calibrating

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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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Bouche, Instruments and Control Systems, Aug. 1961, pp. 1451, 1452.
Navy Technical Disclosure Bulletin, vol. V, No. 4, Apr. 1980, pp. 5-8, Rod A. Bender, "Sea State & Ocean Current Simulator for Sonobuoys".

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