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Superconducting Extremely Low Frequency (ELF) Magnetic Field Sensors for Submarine Communications

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3 Author(s)
S. Wolf ; U. S. Naval Research Lab., Washington ; J. Davis ; M. Nisenoff

The ferromagnetic-core type of solenoid that is used as a trailed antenna for communications reception by submarines has not demonstrated adquate sensitivity to satisfy the performance requirements for deeply submerged submarines receiving extremely low frequency (ELF) transmissions from the planned Sanguine communications system. It is possible, however, that a superconducting quantum interference device (SQUID) can be adapted to this role successfully and can permit all requirements of platform depth, speed, and maneuverability to be met. The present status of SQUID's is described, and some laboratory measurements that prove the potential of these devices for the ELF communications reception capability are presented. The engineering development that must be pursued in the areas of 1) sensor and electronics dynamic range, 2) sensor orthogonality, and 3) refrigeration systems to make SQUID ELF sensors available as operational receiving antennas is also discussed.

Published in:

IEEE Transactions on Communications  (Volume:22 ,  Issue: 4 )