High-temperature single-layer SQUID gradiometers with long baseline and parasitic effective area compensation

First-order HTS SQUID gradiometers were fabricated on 30 x 10 mm super(2) bicrystal substrates. These devices have a baseline of 13 mm, intrinsic balance levels of approx. 1/700 and a typical gradient sensitivity at 1 kHz of 79 fT cm super(-1) Hz super(- one half ). A two-SQUID coupling scheme is di...

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Bibliographic Details
Published in:Superconductor science & technology 1999-11, Vol.12 (11), p.766-768
Main Authors: Pegrum, C M, Eulenburg, A, Romans, E J, Carr, C, Millar, A J, Donaldson, G B
Format: Article
Language:English
Subjects:
Exact sciences and technology
Instruments, apparatus, components and techniques common to several branches of physics and astronomy
Magnetic components, instruments and techniques
Magnetometers for magnetic field measurements
Physics
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Summary:First-order HTS SQUID gradiometers were fabricated on 30 x 10 mm super(2) bicrystal substrates. These devices have a baseline of 13 mm, intrinsic balance levels of approx. 1/700 and a typical gradient sensitivity at 1 kHz of 79 fT cm super(-1) Hz super(- one half ). A two-SQUID coupling scheme is discussed that further enhances the device's ability to reject uniform fields.
ISSN:0953-2048
1361-6668
DOI:10.1088/0953-2048/12/11/322