Tracking geomagnetic fluctuations to picotesla accuracy using two superconducting quantum interference device vector magnetometers
SQUIDs can be used to monitor the three vector components of the geomagnetic field to a high precision at very low frequencies, yet as they are susceptible to external interference, the accuracy to which they can track changes in the dc field over long periods has been unclear. We have carried out s...
| Main Authors: | , , |
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| Format: | Journal article |
| Language: | English |
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American Institute of Physics
2013
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| _version_ | 1797111958869114880 |
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| author | Henry, S di Borgo, E Cavaillou, A |
| author_facet | Henry, S di Borgo, E Cavaillou, A |
| author_sort | Henry, S |
| collection | OXFORD |
| description | SQUIDs can be used to monitor the three vector components of the geomagnetic field to a high precision at very low frequencies, yet as they are susceptible to external interference, the accuracy to which they can track changes in the dc field over long periods has been unclear. We have carried out simultaneous measurements of the geomagnetic field recorded using two independent 3-axis SQUID magnetometers at the Laboratoire Souterrain à Bas Bruit (LSBB). We demonstrate a technique to take the difference between a linear transform of the three signals from one magnetometer, and a reference signal from the other, in order to account for any difference in alignment and calibration, and track local signals at a sub-nT level. We confirmed that both systems tracked the same signal with an RMS difference as low as 56pT over a period of 72 h. To our knowledge this is the first such demonstration of the long term accuracy of SQUID magnetometers for monitoring geomagnetic fields. |
| first_indexed | 2024-03-07T08:16:03Z |
| format | Journal article |
| id | oxford-uuid:b6cc2ef5-70d3-4a4c-a390-e2cd5fd51b97 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T08:16:03Z |
| publishDate | 2013 |
| publisher | American Institute of Physics |
| record_format | dspace |
| spelling | oxford-uuid:b6cc2ef5-70d3-4a4c-a390-e2cd5fd51b972024-01-04T10:51:34ZTracking geomagnetic fluctuations to picotesla accuracy using two superconducting quantum interference device vector magnetometersJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:b6cc2ef5-70d3-4a4c-a390-e2cd5fd51b97EnglishSymplectic Elements at OxfordAmerican Institute of Physics2013Henry, Sdi Borgo, ECavaillou, ASQUIDs can be used to monitor the three vector components of the geomagnetic field to a high precision at very low frequencies, yet as they are susceptible to external interference, the accuracy to which they can track changes in the dc field over long periods has been unclear. We have carried out simultaneous measurements of the geomagnetic field recorded using two independent 3-axis SQUID magnetometers at the Laboratoire Souterrain à Bas Bruit (LSBB). We demonstrate a technique to take the difference between a linear transform of the three signals from one magnetometer, and a reference signal from the other, in order to account for any difference in alignment and calibration, and track local signals at a sub-nT level. We confirmed that both systems tracked the same signal with an RMS difference as low as 56pT over a period of 72 h. To our knowledge this is the first such demonstration of the long term accuracy of SQUID magnetometers for monitoring geomagnetic fields. |
| spellingShingle | Henry, S di Borgo, E Cavaillou, A Tracking geomagnetic fluctuations to picotesla accuracy using two superconducting quantum interference device vector magnetometers |
| title | Tracking geomagnetic fluctuations to picotesla accuracy using two superconducting quantum interference device vector magnetometers |
| title_full | Tracking geomagnetic fluctuations to picotesla accuracy using two superconducting quantum interference device vector magnetometers |
| title_fullStr | Tracking geomagnetic fluctuations to picotesla accuracy using two superconducting quantum interference device vector magnetometers |
| title_full_unstemmed | Tracking geomagnetic fluctuations to picotesla accuracy using two superconducting quantum interference device vector magnetometers |
| title_short | Tracking geomagnetic fluctuations to picotesla accuracy using two superconducting quantum interference device vector magnetometers |
| title_sort | tracking geomagnetic fluctuations to picotesla accuracy using two superconducting quantum interference device vector magnetometers |
| work_keys_str_mv | AT henrys trackinggeomagneticfluctuationstopicoteslaaccuracyusingtwosuperconductingquantuminterferencedevicevectormagnetometers AT diborgoe trackinggeomagneticfluctuationstopicoteslaaccuracyusingtwosuperconductingquantuminterferencedevicevectormagnetometers AT cavailloua trackinggeomagneticfluctuationstopicoteslaaccuracyusingtwosuperconductingquantuminterferencedevicevectormagnetometers |