Performance of the ELF Antenna Water-Flow Tunnel
MASSACHUSETTS INST OF TECH LEXINGTON LINCOLN LAB
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A water-flow tunnel for testing submarine-towed ELF antennas has been built. A years operating experience with it shows that it can rapidly provide valuable test data attainable otherwise only slowly on submarines. Its thick aluminum shielding creates, within the tunnel, the electromagnetically quiet undersea environment the pipe turbulence of the flow excites the antenna cable essentially uniformly along its length, as does the boundary layer turbulence of a cable under tow and, using a bias winding on the antenna, the axial magnetic bias field can be varied to simulate heading changes.
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