A signal input coil made of superconducting thin film for improved signal-to-noise ratio in a high-Tc SQUID-based ultra-low field nuclear magnetic resonance system

Kuen Lin Chen, Chin Wei Hsu, Yue Bai Ku, Hsin Hsien Chen, Shu-Hsien Liao, Li Min Wang, Herng-Er Horng, Hong-Chang Yang

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    Abstract

    Resonant coupling schemes are commonly used in SQUID-based ultra-low field (ULF) nuclear magnetic resonance (NMR) systems to couple the spin relaxation signals from samples to the SQUID. Generally, in NMR systems, a resonant coupling scheme is composed of two solenoid coils which are made of enamel insulated wires and a capacitor connected in series. In this work, we tried to replace the metal solenoid input coil with a planar high-Tc superconducting spiral coil to improve the signal-to-noise ratio (SNR) of the ULF NMR signal. A measurement of the free induction decay signal of water protons was performed to demonstrate the improved performance of the system. This improvement is due to the fact that the planar superconducting spiral coil possesses a higher mutual inductance with the SQUID. Therefore, it is a promising way to enhance the SNR of high-Tc SQUID-based ULF NMR/MRI systems.

    Original languageEnglish
    Article number115008
    JournalSuperconductor Science and Technology
    Volume26
    Issue number11
    DOIs
    Publication statusPublished - 2013 Nov 1

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    ASJC Scopus subject areas

    • Ceramics and Composites
    • Condensed Matter Physics
    • Metals and Alloys
    • Materials Chemistry
    • Electrical and Electronic Engineering

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