Accession Number : ADD011131

Title :   Very Low Frequency Hydrophone Calibration.

Descriptive Note : Patent,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : McEachern,J F

Report Date : 03 Apr 1984

Pagination or Media Count : 4

Abstract : An improved system is disclosed for calibrating acoustic pressure-sensitive transducers, particularly hydro-phones, down to frequencies in the sub-Hertz range. A transducer under test and a reference transducer, both electrically connected 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. (Author)

Descriptors :   *Patents, *Hydrophones, *Pressure transducers, *Very low frequency, Infrasonic radiation, Water tanks, Hydrostatic pressure, Electric motors, Cams, Voltage, Calibration

Subject Categories : Electrical and Electronic Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE