用于NMR的一种结构简单、无需调谐的超宽带探头
An Easily Constructed, Tuning Free, Ultra-broadband Probe for NMR
摘要：
我们研制了一种结构简单的非共振宽带核磁共振探针。探头为鞍形线圈几何形状，设计为线圈本身形成传输线。因此，探头不需要调谐或匹配元件。我们将探头与光谱仪一起使用，光谱仪的RF电路采用简单的RF开关而不是更常见的λ/4线，因此整个探头和光谱仪以基本上与频率无关的方式执行。尽管采用静电和静磁公式设计，但探头在高达150 MHz及以上的频率下表现良好。我们希望通过额外的设计工作，可以修改探头以用于更高的频率。由于我们的构造方法依赖于商业电路制造技术，因此可以轻松准确地生产相同的探针。
英文摘要：
We have developed an easy to construct, non-resonant wideband NMR probe. The probe is of the saddle coil geometry and is designed such that the coil itself forms a transmission line. The probe thus requires no tuning or matching elements. We use the probe with a spectrometer whose duplexer circuitry employs a simple RF switch instead of the more common lambda/4 lines, so the entire probe and spectrometer perform in an essentially frequency-independent manner. Despite being designed with electro- and magnetostatic formulas, the probe performs well at frequencies up to 150 MHz and beyond. We expect that with additional design effort, the probe could be modified for use at significantly higher frequencies. Because our construction method relies on commercial circuit fabrication techniques, identical probes can be easily and accurately produced.
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