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Application of the double relaxation oscillation superconducting quantum interference device sensor to micro-tesla 1H nuclear magnetic resonance experiments
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10.1063/1.3626826
/content/aip/journal/jap/110/5/10.1063/1.3626826
http://aip.metastore.ingenta.com/content/aip/journal/jap/110/5/10.1063/1.3626826

Figures

Image of FIG. 1.
FIG. 1.

(Color online) Equivalent circuit diagram DROS second-order gradiometer (a), and photograph of a fabricated DROS second-order gradiometer (b). All parts of DROS second-order gradiometer except the pick-up coil are wrapped with a superconducting shield.

Image of FIG. 2.
FIG. 2.

(Color online) Fabricated Josephson junction array (a), overall image of the Josephson junction array and the DROS (b). Two parts are superconductively connected with Nb wire and covered with a Pb of 99.9% purity.

Image of FIG. 3.
FIG. 3.

(Color online) The orientation of the pickup coil, pre-polarization coil, measurement coil, gradient coil, and sample for the ULF-MRI system (a). The pulse sequence for a pre-polarization MRI system (b). The DROS second-order gradiometer is switched to the FLL state after turning-off the Bp; its delay time (tFLL) is 5 ms.

Image of FIG. 4.
FIG. 4.

Noise spectrum of a DROS second-order gradiometer in a magnetically shielded room.

Image of FIG. 5.
FIG. 5.

(Color online) Current limiting characteristics of a current limiter. Slowly-varying wave of (a) and (b) are DROS flux-to-voltage modulation curves in the response to an AC magnetic field of 0.5 Hz without and with the Josephson junction array, respectively. (c) shows the change in the dc magnetic field. The DROS modulation is suppressed by the Josephson junction array in the high magnetic field (∼6 mT) region.

Image of FIG. 6.
FIG. 6.

(Color online) The single-scanned 1H NMR FID signal measured with a DROS second-order gradiometer (a). The FFT spectrum derived from 1H NMR FID signal (b). The FFT was performed after the zero-filling to enhance spectral resolution.

Image of FIG. 7.
FIG. 7.

(Color online) The single-scanned FID signal under a magnetic field gradient (a), one-dimensional MR image of the water sample, which is separated by a rubber partition (b).

Image of FIG. 8.
FIG. 8.

(Color online) The NMR spectrum derived from the single-scanned 1H NMR signal, which was wrapped with aluminum foil and paper.

Image of FIG. 9.
FIG. 9.

(Color online) The single-scan FID signal of trimethylphosphate measured in a field of 5.4 µT (a), the NMR spectrum derived from the FID signal of trimethylphosphate (b). A heteronuclear J-coupling between 1H and 31P of trimethylphosphate, which splits the NMR line as a doublet.

Image of FIG. 10.
FIG. 10.

Noise spectrum of dc-SQUID second-order gradiometer in magnetically shielded room.

Image of FIG. 11.
FIG. 11.

(Color online) The single-scanned 1H NMR FID signal measured with a DROS based ULF-NMR system (a) and with a dc-SQUID based ULF-NMR system (b). The insets in (a) and (b) are FFT spectrum derived from each 1H FID signal.

Tables

Generic image for table
Table I.

Important parameters of DROS second-order gradiometer.

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/content/aip/journal/jap/110/5/10.1063/1.3626826
2011-09-08
2014-04-21
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Application of the double relaxation oscillation superconducting quantum interference device sensor to micro-tesla 1H nuclear magnetic resonance experiments
http://aip.metastore.ingenta.com/content/aip/journal/jap/110/5/10.1063/1.3626826
10.1063/1.3626826
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