This title appears in the Scientific Report :
2014
Please use the identifier:
http://hdl.handle.net/2128/16749 in citations.
Please use the identifier: http://dx.doi.org/10.1063/1.4901964 in citations.
High-sensitivity cooled coil system for nuclear magnetic resonance in kHz range
High-sensitivity cooled coil system for nuclear magnetic resonance in kHz range
In several low-field Nuclear Magnetic Resonance (LF-NMR) and surface nuclear magnetic resonance applications, i.e., in the frequency range of kHz, high sensitivity magnetic field detectors are needed. Usually, low-T c superconducting quantum interference devices (SQUIDs) with a high field sensitivit...
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Personal Name(s): | Lin, Tingting |
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Zhang, Yi / Lee, Yong-Ho / Krause, Hans-Joachim / Lin, Jun / Zhao, Jing (Corresponding Author) | |
Contributing Institute: |
JARA-FIT; JARA-FIT Bioelektronik; PGI-8 |
Published in: | Review of scientific instruments, 85 (2014) 11, S. 114708 |
Imprint: |
[S.l.]
American Institute of Physics
2014
|
DOI: |
10.1063/1.4901964 |
Document Type: |
Journal Article |
Research Program: |
Sensorics and bioinspired systems |
Link: |
OpenAccess |
Publikationsportal JuSER |
Please use the identifier: http://dx.doi.org/10.1063/1.4901964 in citations.
In several low-field Nuclear Magnetic Resonance (LF-NMR) and surface nuclear magnetic resonance applications, i.e., in the frequency range of kHz, high sensitivity magnetic field detectors are needed. Usually, low-T c superconducting quantum interference devices (SQUIDs) with a high field sensitivity of about 1 fT/Hz1/2 are employed as detectors. Considering the flux trapping and operational difficulties associated with low-T c SQUIDs, we designed and fabricated liquid-nitrogen-cooled Cu coils for NMR detection in the kHz range. A cooled coil system consisting of a 9-cm diameter Cu coil and a low noise preamplifier was systematically investigated and reached a sensitivity of 2 fT/Hz1/2 at 77 K, which is 3 times better compared to the sensitivity at 300 K. A Q-switch circuit as an essential element for damping the ringing effects of the pickup coil was developed to acquire free induction decay signals of a water sample with minimum loss of signal. Our studies demonstrate that cooled Cu coils, if designed properly, can provide a comparable sensitivity to low-T c SQUIDs |