Gradiometer based on two single-hole SQUIDs
| Parent link: | IEEE Transactions on Instrumentation and Measurement Vol. 39, iss. 6.— 1990.— [P. 1034-1037] |
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| Altri autori: | , , , |
| Riassunto: | Title screen A gradiometer based on two ceramic superconducting quantum interference devices (SQUIDs) operating at liquid-nitrogen temperature is developed. The minimum gradient sensitivity is 3.1Ч10-12 T/mHz1/2 in a white-noise region. The minimum damping coefficient of the external disturbing factors is K=32. The gradiometer consists of two independent magnetometers separated from each other by 9 cm. It was tested by measuring the magnetocardiogram of a human heart. A typical magnetocardiogram was measured simultaneously with the magnetometer, with one lower channel of the gradiometer, and with the described gradiometer. The measurements were carried out with a bandwidth of 60 Hz, in real time, inside the ?5-mm-wall aluminum barrel 50-m outside the nearest building. The comparison of these magnetocardiograms shows that the gradiometer considerably suppresses the low-frequency variations of the magnetic field of the Earth, the low-frequency industrial noise, and the influence of cryostat vibration Режим доступа: по договору с организацией-держателем ресурса |
| Pubblicazione: |
1990
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| Soggetti: | |
| Accesso online: | https://doi.org/10.1109/19.65821 |
| Natura: | Elettronico Capitolo di libro |
| KOHA link: | https://koha.lib.tpu.ru/cgi-bin/koha/opac-detail.pl?biblionumber=637238 |
| Riassunto: | Title screen A gradiometer based on two ceramic superconducting quantum interference devices (SQUIDs) operating at liquid-nitrogen temperature is developed. The minimum gradient sensitivity is 3.1Ч10-12 T/mHz1/2 in a white-noise region. The minimum damping coefficient of the external disturbing factors is K=32. The gradiometer consists of two independent magnetometers separated from each other by 9 cm. It was tested by measuring the magnetocardiogram of a human heart. A typical magnetocardiogram was measured simultaneously with the magnetometer, with one lower channel of the gradiometer, and with the described gradiometer. The measurements were carried out with a bandwidth of 60 Hz, in real time, inside the ?5-mm-wall aluminum barrel 50-m outside the nearest building. The comparison of these magnetocardiograms shows that the gradiometer considerably suppresses the low-frequency variations of the magnetic field of the Earth, the low-frequency industrial noise, and the influence of cryostat vibration Режим доступа: по договору с организацией-держателем ресурса |
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| DOI: | 10.1109/19.65821 |