초록 ▼

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) wi

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.

대표청구항 ▼

[ We claim:] [1.] An NMR measuring device comprising:an NMR probe head having a receiver coil and a receiver coil preamplifier;one single cryo-cooler having a first cooling stage and a second cooling stage, said first cooling stage having a first stage temperature which is higher than a second stage

[ We claim:] [1.] An NMR measuring device comprising:an NMR probe head having a receiver coil and a receiver coil preamplifier;one single cryo-cooler having a first cooling stage and a second cooling stage, said first cooling stage having a first stage temperature which is higher than a second stage temperature of said second cooling stage;a first cooling circuit having a first coolant flow communicating with said preamplifier to cool said preamplifier to a preamplifier temperature and having a first cryogenically insulated transfer conduit to transfer said first coolant flow into and out of said probe head for thermally connecting said first stage to said preamplifier;a second cooling circuit having a second coolant flow communicating with said receiver coil to cool said receiver coil to a receiver coil temperature and having a second cryogenically insulated transfer conduit to transfer said second coolant flow into and out of said probe head for thermally connecting said second stage to said receiver coil, whereby said preamplifier temperature is higher than said receiver coil temperature.