Direct detection of low‐frequency NMR using a dc SQUID

A system has been developed to directly observe NMR free induction signals at very low frequencies. We use a nonresonant pickup arrangement with a commercial dc SQUID to monitor the precessing magnetization in a 0.5–50‐kHz range of Larmor frequencies. A relocking interval for the SQUID’s flux locked...

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Veröffentlicht in:	Rev. Sci. Instrum.; (United States) 1986-03, Vol.57 (3), p.410-413
Hauptverfasser:	Friedman, L. J., Wennberg, A. K. M., Ytterboe, S. N., Bozler, H. M.
Format:	Artikel
Sprache:	eng
Schlagworte:	420201 - Engineering- Cryogenic Equipment & Devices CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS ELECTRONIC EQUIPMENT Exact sciences and technology FABRICATION FLUXMETERS Infrared, submillimeter wave, microwave and radiowave instruments, equipment and techniques Instruments, apparatus, components and techniques common to several branches of physics and astronomy MAGNETIC RESONANCE MAGNETIZATION MEASURING INSTRUMENTS MEASURING METHODS MICROWAVE EQUIPMENT NMR SPECTROMETERS NUCLEAR MAGNETIC RESONANCE OPERATION Physics RESONANCE SPECTROMETERS SQUID DEVICES Submillimeter wave, microwave and radiowave spectrometers magnetic resonance spectrometers, auxiliary equipments and techniques SUPERCONDUCTING DEVICES
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Beschreibung
Zusammenfassung:	A system has been developed to directly observe NMR free induction signals at very low frequencies. We use a nonresonant pickup arrangement with a commercial dc SQUID to monitor the precessing magnetization in a 0.5–50‐kHz range of Larmor frequencies. A relocking interval for the SQUID’s flux locked loop presently sets our pulse recovery around 20–30 μs throughout this frequency range. The noise for this system is less than 1.5 times that recorded for the SQUID with shorted input terminals.
ISSN:	0034-6748 1089-7623
DOI:	10.1063/1.1138900