Nuclear magnetic resonance (NMR) probes based on high-temperature superconducting (HTS) resonators have demonstrated significant gains in detection sensitivity. However, the widespread acceptance of this technology has been limited by some unresolved issues including the mechanical unreliability of the moveable inductive loops used to adjust tuning and matching. In order to improve reliability, we propose to implement frequency tuning and impedance matching of HTS resonators using fixed inductively coupled loops and variable capacitors. By analyzing the loss mechanisms associated with inductive loops, we predict that using a superconducting inductive loop for tuning and matching will not only improve the reliability of HTS probes, but also provide improvements in sensitivity.

中文翻译：

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基于 HTS 的 NMR 探头中的电感耦合频率调谐和阻抗匹配

基于高温超导 (HTS) 谐振器的核磁共振 (NMR) 探针已证明在检测灵敏度方面有显着提高。然而，这项技术的广泛接受受到一些未解决的问题的限制，包括用于调整调谐和匹配的可移动感应回路的机械不可靠性。为了提高可靠性，我们建议使用固定电感耦合回路和可变电容器来实现 HTS 谐振器的频率调谐和阻抗匹配。通过分析与感应回路相关的损耗机制，我们预测使用超导感应回路进行调谐和匹配不仅可以提高 HTS 探头的可靠性，而且还可以提高灵敏度。