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SQUID gradiometers for a fundamental study of underwater magnetic detection

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4 Author(s)
Hirota, M. ; Japan Defense Agency, Kawasaki, Japan ; Nanaura, K. ; Teranishi, Y. ; Kishigami, T.

An LTS SQUID gradiometer measuring six elements of first order magnetic gradient was produced for a fundamental study of magnetic detection and localization under water. It was installed at the sea bottom shallower than 30 m and we measured magnetic noise which might degrade its detecting performance. Noise caused by the imbalance of the gradiometer pickup coils was suppressed by using an auxiliary three-axis SQUID magnetometer output. The imbalance parameters were determined by measuring geomagnetic variations surrounding the sea bottom. A test for the trial detection of an iron boat was conducted with the use of this gradiometer. The results obtained showed a high signal-to-noise ratio for the gradiometer.

Published in:

Applied Superconductivity, IEEE Transactions on  (Volume:7 ,  Issue: 2 )