RF receiver coil arrangement for NMR spectrometers

Details RF receiver coil arrangement for NMR spectrometers RF receiver coil arrangement for NMR spectrometers

1991-04-24

1993-09-21

Arana, Louis

Electricity: measuring and testing

Particle precession resonance

Spectrometer components

324315, G01V 300

Patent

active

052472566

ABSTRACT:
In the case of a nuclear magnetic resonance spectrometer containing a sample (1) arranged in a homogeneous magnetic field and being adjusted approximately to room temperature or a higher temperature, and a RF receiver coil (3) which is arranged around the sample (1) and cooled down to far below room temperature, for receiving nuclear magnetic resonance signals from the sample (1), at least certain parts of the RF receiver coil (3) are in thermal contact with a cooled platform (7). The connection lines of the RF receiver coil (3), the outer resonator wall (10), the pre-amplifier and the coolant transfer lines can be cooled by cold return gas. Thanks to this arrangement of the RF receiver coil (3), one achieves an optimum space factor, the thermal noise of the receiver system is drastically reduced, the Q factor of the resonant circuit is increased, and consequently the signal-to-noise ratio is improved.

REFERENCES:
patent: 3826972 (1974-07-01), Day et al.
patent: 4240033 (1980-12-01), Anderson et al.
Styles et al., Journal of Magnetic Resonance 60, 397-404 (1984).
Hoult et al., Journal of Magnetic Resonance 24, 71-85 (1976).
Styles et al., Journal of Magnetic Resonance 84, 376-378 (1989).
Review of Scientific Instruments, vol. 55, No. 1, Jan. 1984, New York US, pp. 68-74 K. Carduner et al.: "Variable-temperature solid-state nuclear-magnetic-resoance probe for superconducting magnets . . . ".
Review of Scientific Instruments, vol. 57, No. 3, Mar. 1986, New York US, pp. 404-409 M. G. Richards et al.: "Cryogenic GaAs FET amplifiers and their Use in NMR detection".
Review of Scientific Instruments, vol. 57, No. 3, Mar. 1986, New York US, pp. 410-413 L. J. Friedman et al.: "Direct detection of low-frequency NMR using a dc SQUID".
Review of Scientific Instruments, vol. 36, No. 10, 1965, New York US, pp. 1509-1510 S. Meiboom, R. C. Hewitt: "High Resolution NMR Probe Suitable for Use in a Superconducting Solenoid".

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