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An NMR (nuclear magnetic resonance) spectrometer is modified, as shown in the drawings, to use relatively short sample tubes for inserting the sample into the spectrometer for analysis.
English (United States)
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NMR Spectrometer Sample Tube Support
An NMR (nuclear magnetic resonance) spectrometer is modified, as shown
in the drawings, to use relatively short sample tubes for inserting the sample into
the spectrometer for analysis.
As illustrated, top cover 1 is provided with a cut-out 2 to receive a cup-
shaped member 3. The interior of member 3 is of such a size that an operator's
hand can readily insert and withdraw a capped sample tube 4. A permanent
magnet 5 underlies member 3 and is provided with the customary air gap into
which a sample in tube 4 is inserted. A probe 6 is also supported in the gap
concentric to tube 4. A stop screw 7 abuts the bottom of tube 4 and provides
adjustment to place or locate the sample at the desired portion of the gap. A
microswitch 8 has a lever 9 or actuating arm disposed adjacent the path of travel
of tube 4 and is actuated upon insertion of tube 4 to provide a signal indicating
such fact. Member 3 rests on a heat shield l0. Connecting members 11 further
connect shield l0 to the original heat shield 12, which further forms an insulating
barrier around the magnet.
The principal advantage of such design is that tube 4 may be of either glass
or plastic and of a length of about three inches. Such tubes are relatively cheap
and available. Another advantage of the design is that the bottom of member 3
is relatively flat, and, should any spillage occur during handling of the sample, the
spillage would be collected on the bottom surface and...