TY - JOUR
T1 - Remote Tuning of NMR Probe Circuits
AU - Kodibagkar, Vikram D.
AU - Conradi, Mark S.
N1 - Funding Information:
The authors appreciate many conversations with R. A. McKay. We are most grateful for the helpful remarks of an anonymous referee. This work was supported in part by NSF Grant DMR 9705080.
Copyright:
Copyright 2017 Elsevier B.V., All rights reserved.
PY - 2000/5
Y1 - 2000/5
N2 - 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.
AB - 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.
KW - Probe
KW - Remote tuning
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U2 - 10.1006/jmre.2000.2052
DO - 10.1006/jmre.2000.2052
M3 - Article
C2 - 10783273
AN - SCOPUS:0034184074
SN - 1090-7807
VL - 144
SP - 53
EP - 57
JO - Journal of Magnetic Resonance
JF - Journal of Magnetic Resonance
IS - 1
ER -