Murphree D, Cahn S B, Rahmlow D, Demille D
Yale University, Department of Physics, New Haven, CT 06520, USA.
J Magn Reson. 2007 Sep;188(1):160-7. doi: 10.1016/j.jmr.2007.05.025. Epub 2007 Jul 13.
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.
我们开发了一种易于构建的非谐振宽带核磁共振探头。该探头采用鞍形线圈几何结构，其设计使得线圈本身构成一条传输线。因此，该探头不需要调谐或匹配元件。我们将该探头与一台光谱仪配合使用，该光谱仪的双工器电路采用简单的射频开关而非更常见的λ/4传输线，所以整个探头和光谱仪在本质上以与频率无关的方式运行。尽管该探头是根据静电和静磁公式设计的，但它在高达150兆赫兹及以上的频率下表现良好。我们预计，通过进一步的设计努力，该探头可以进行修改以在更高得多的频率下使用。由于我们的构建方法依赖于商业电路制造技术，相同的探头可以轻松且精确地生产出来。
