论文标题
低温冷却的高敏性核四极共振光谱仪
A Cryogenically-Cooled High-Sensitivity Nuclear Quadrupole Resonance Spectrometer
论文作者
论文摘要
本文描述了14N核四极共振（NQR）光谱仪的射频（RF）光谱仪，该光谱使用了冷却至77 K的检测器线圈来最大化测量敏感性。该设计使用一个最低侵入的主动双链体网络和机械接触开关来实现一个可重新配置的系列/并行线圈调谐网络，该网络允许独立优化传输和接收模式性能。该设计是电池供电的，包括一个混合信号嵌入式系统，以监视和控制二级过程，从而实现自主操作。对对乙酰氨基酚样品的测试表明，冷却检测器和样品同时每扫描的信噪比（SNR）增加了约88倍（以功率单位为单位），这与理论预测很好地一致。
The paper describes a radio frequency (RF) spectrometer for 14N nuclear quadrupole resonance (NQR) spectroscopy that uses a detector coil cooled to 77 K to maximize measurement sensitivity. The design uses a minimally-intrusive network of active duplexers and mechanical contact switches to realize a digitally reconfigurable series/parallel coil tuning network that allows transmit- and receive-mode performance to be independently optimized. The design is battery-powered and includes a mixed-signal embedded system to monitor and control secondary processes, thus enabling autonomous operation. Tests on an acetaminophen sample show that cooling both the detector and sample increases the signal-to-noise ratio (SNR) per scan by a factor of approximately 88 (in power units), in good agreement with theoretical predictions.
