NMR measuring device having a cooled probe head

Details NMR measuring device having a cooled probe head NMR measuring device having a cooled probe head

1998-03-27

1999-03-30

Donovan, Lincoln

Electricity: magnetically operated switches, magnets, and electr

Magnets and electromagnets

Magnet structure or material

324318, 62 471, 505892, H01F 500

Patent

active

058894560

ABSTRACT:
An NMR measuring device contains an NMR probe head (10a) having an NMR receiver coil (11), and the probe head can be supplied via a cryogenically insulated transfer conduit (9) with coolant from a cooling device (1a). The cooling device comprises a cryo-cooler (2) having a first cooling stage (4) with a first stage exchanger (12) and a second cooling stage (3) having a second stage exchanger (8). A pump (6) transports coolant in the cooling circuit. The NMR probe head (10a), in addition to the NMR receiver coils (11), has preamplifiers (21) for amplifying the received NMR signals and an additional cryogenically insulated transfer conduit (20) is inserted between the cooling device (1a) and the NMR probe head (10a) by means of which, the preamplifiers (21) and/or the components in contact with the preamplifiers (21) can be supplied with a flow of coolant at a higher temperature than that used for cooling the NMR receiver coils (11). Only the cryo-cooler (2) and, if appropriate, additional heat exchangers are required for cooling both coolant streams. In this fashion a substantial reduction in noise, including that of the amplifiers, is achieved using simple techniques and without great technical expense and difficulty.

REFERENCES:
patent: 4277949 (1981-07-01), Longsworth
patent: 4279127 (1981-07-01), Longsworth
patent: 5247256 (1993-09-01), Marek
patent: 5508613 (1996-04-01), Kotsubo et al.
Patents abstracts of Japan P-1653 Dec. 3, 1993, vol.17/No.654 "Probe for Nuclear Magnetic Resonance Device" JP 5-215829 published Aug. 27, 1993.

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