USA As Represented by Secretary of the Navy

Daniel R Nashold

Steven E Crocker

William H Slater

Ronald R Smalley

Michael A Bergeron

Joseph A Carreiro

Jason R Bernier

Ryan Amaral

Brian W Duarte

Amarilis Blankenship

Ernest J Briggs

Mark R Grden

A method is provided to measure the complex sensitivity of hydrophone data channels across a range of frequencies by using a water-filled tank with proximate boundaries. A hydrophone array and reference hydrophone are helically affixed to a test fixture resting on a rotation platform. When the test fixture is submerged in the tank; the platform rotates about a contour of the platform in intervals for a predetermined time interval before indexing to the next angle. Signals transmitted by an acoustic projector in the tank are received on the hydrophones of the line array and the calibrated reference hydrophone. Electrical signals from the reference hydrophone are transmitted over an electrical cable and received by the acoustic data processor for use in calibrating the hydrophone line array. Electrical signals from the hydrophones of the hydrophone line array are also transmitted to the data processor.

System and method for the calibration of a hydrophone line array in a water-filled tank

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Mattapoisett, MA, United States of America

Daniel R Nashold