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HTS SQUID gradiometer for application without shielding
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DOI：10.1088/0953-2048/15/1/321.png)
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摘要
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An HTS SQUID gradiometer consisting of a series gradiometer pickup loop in flip-chip configuration with a small washer SQUID is presented. The series gradiometer configuration is advantageous for applications without shielding because of the avoidance of circulating shielding currents in the pickup loop. With a 20 mm x 10 mm substrate for the pickup loop a large effective area of 1.25 mm(2) and a gradiometer baseline of 9.6 mm are achieved. The balance of the gradiometer impaired by the washer read-out SQUID can significantly be enhanced by the weighted subtraction of a reference SQUID's signal. With this a balance of 5 x 10(4) is reached. The noise-limited magnetic field gradient resolution of the balanced SQUID gradiometer is 38 fT cm(-1) Hz(-1/2).
Keyword:
MAGNETOMETERS
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