Electricity: measuring and testing – Particle precession resonance – Spectrometer components
Patent
1994-08-29
1996-04-16
O'Shea, Sandra L.
Electricity: measuring and testing
Particle precession resonance
Spectrometer components
324322, 324315, G01V 300
Patent
active
055086136
ABSTRACT:
In Nuclear Magnetic Resonance (NMR) spectroscopy and microscopy, noise from the receiver coil of the probe limits sensitivity. This noise may be reduced by cooling the receiver coil. Noise may be even further reduced by use of a superconducting receiver coil. However, high temperature superconductors must be maintained at temperatures significantly below the critical temperature, typically in the range of 10-60 K for proper performance. The invention provides an apparatus for cooling an NMR receiver coil to a desired temperature using a closed circuit refrigeration system. A cold fluid is circulated to a heat exchanger which is in thermal contact with a thermally conductive substrate having low magnetic susceptibility. The receiver coil is deposited on a portion of the substrate located distally from the heat exchanger. In the preferred embodiment, the substrate is sapphire and the receiver coil is a superconductive oxide. In one embodiment of the invention, the cold fluid is delivered through a cold-finger device, thus permitting easy access to the receiver coil while maintaining the closed circuit cooling.
REFERENCES:
patent: 3771055 (1973-11-01), Anderson
patent: 5247256 (1993-09-01), Marek
patent: 5258710 (1993-11-01), Black et al.
Withers, et al., "HTS Receiver Coils for Magnetic Resonance Instruments" (1994) SPIE 2156:27-35.
P. Styles, et al., "A High-Resolution NMR Probe in Which the Coil and Preamplifier Are Cooled with Liquid Helium" (1984) Journal of Magnetic Resonance 60:397-404.
Black Robert D.
Kotsubo Vincent
Black Robert
Conductus, Inc.
DeFranco Judith A.
Haynes Mack
O'Shea Sandra L.
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