Interplay among recovery time, signal, and noise: Series- and parallel-tuned circuits are not always the same
✍ Scribed by Miller, J. B. ;Suits, B. H. ;Garroway, A. N. ;Hepp, M. A.
- Book ID
- 101276925
- Publisher
- John Wiley and Sons
- Year
- 2000
- Tongue
- English
- Weight
- 297 KB
- Volume
- 12
- Category
- Article
- ISSN
- 1043-7347
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✦ Synopsis
The quality factor, Q, of the magnetic resonance probe and the manner in which the probe is coupled to the spectrometer play important roles in the quality of the ( ) obtained experimental data, affecting the signal-to-noise ratio SNR , the probe recovery time, radiation-damping, and the coupling between multiple coils. For example, high SNR often requires a high-Q probe, while a short recovery time to observe of broad signals generally requires low Q. Here, we discuss effecting a compromise between SNR and recovery time by adjusting the coupling of the probe and preamplifier by mismatching their impedances. Unlike the more common impedance-matched case, the conditions for optimum performance for parallel-and series-tuned probes are found to differ significantly.