Remote Tuning of NMR Probe Circuits

Vikram D. Kodibagkar, Mark S. Conradi

Research output: Contribution to journalArticle

22 Scopus citations

Abstract

There are many circumstances in which the probe tuning adjustments cannot be located near the rf NMR coil. These may occur in high-temperature NMR, low-temperature NMR, and in the use of magnets with small diameter access bores. We address here circuitry for connecting a fixed-tuned probe circuit by a transmission line to a remotely located tuning network. In particular, the bandwidth over which the probe may be remotely tuned while keeping the losses in the transmission line acceptably low is considered. The results show that for all resonant circuit geometries (series, parallel, series-parallel), overcoupling of the line to the tuned circuit is key to obtaining a large tuning bandwidth. At equivalent extents of overcoupling, all resonant circuit geometries have nearly equal remote tuning bandwidths. Particularly for the case of low-loss transmission line, the tuning bandwidth can be many tunes the tuned circuit's bandwidth, fo/Q.

Original languageEnglish (US)
Pages (from-to)53-57
Number of pages5
JournalJournal of Magnetic Resonance
Volume144
Issue number1
DOIs
StatePublished - May 2000
Externally publishedYes

Keywords

  • Probe
  • Remote tuning

ASJC Scopus subject areas

  • Biophysics
  • Biochemistry
  • Nuclear and High Energy Physics
  • Condensed Matter Physics

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