USA As Represented by Secretary of the Navy

Jason R Bernier

Michael R Williams

Steven E Crocker

Michael J Kroger

Brian K Amaral

Robert F Cutler, Iii

Ronald R Smalley

William H Slater

Michael A Bergeron

Joseph A Carreiro

Kathryn A Best

Amarilis Blankenship

Ernest J Briggs

Brian W Duarte

Charles A Holicker

Daniel R Nashold

Mark R Grden

Eric A Lee

Ryan Amaral

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

A strength member sewing machine is provided which comprises upper and lower feeder spools, a collection spool and idlers positioned on a support structure. A cord supply, a fabric shaper, a speed control and a pressure foot lift are positioned on the structure. Fabric from the spools is kept in tension with the idlers while moving toward the fabric shaper. The fabric from the upper spool is crimped while the fabric from the lower spool remains flat underneath the shaper. Between the fabric layers, pull cords are pulled through from the cord supply thru the fabric shaper. The fabric with crimps and with the pull cords inside the crimps is sewn to the fabric from the lower spool to create casings with a pull cord in the internal space of each casing. The joined fabrics with the pull cords are collected by the collection spool as a finished product.

Sewing machine for continuous strength members

Growing community of inventors

Exeter, RI, United States of America

Jason R Bernier