Somebody has been posting terrific old Scientific Amercian articles from back inthe nineteen fiftiesin the google GeigerCounterEnthusiasts group.This is one of those:How Amateurs Can Build a Simple Magnetic-Resonance Spectrometer uses tubes of course.There are many more, look at the group index: A lot of basic stuff, actually something to learn from.

in the nineteen fiftiesI've seen kids do this at science fairs. All you need to do CW NMR isa fairly homogenous magnet, a couple of coils, and a little RF stuff.Pulsed isn't much harder.I'd bet you could do something with some iron pole-pieces and a bunchof the little bulletin-board supermagnet cylinder things. Move themagnets around to tweak field uniformity. A microwave oven magnetroncould be used, too, with a little pole-piece shimming maybe.Water makes a huge NMR signal. The Qs are extraordinary, 1e6 to 1e9,and depend mostly on how homogenous the field is across the samplevolume. Higher frequencies, and corresponding higher field strengths,make better signals, but even the earth's field does usable NMR.Amateur MRI should be feasible, too.Scientific American used to be great.John

rgetheissee ised-atcoils 90 degrees.w for tinkering. on.uctors,tsYup, we've sold a lot NMR's Heres the original,And the latest model.The Fluorine experiments are very nice! You can even see the protonchemical shifts in Methanol. (But Fluorine is easier.)George H.

How Amateurs Can Build a Simple Magnetic-Resonance Spectrometer

Feb 05, 2011 21 Replies

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langwadt 15 years ago

ils 90 degrees.

for tinkering.

tors,

you should also be able to repeat the echo.

90degree,tau,180degree,tau,echo,tau,180degree,tau,echo.......

the echo will get smaller and smaller but with a long T1 it is slow

-Lasse

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George Herold 15 years ago

rge

the

see

ed-

coils 90 degrees.

w for tinkering.

on.

uctors,

Yup, we've sold a lot NMR's Heres the original,

formatting link

And the latest model.

formatting link

The Fluorine experiments are very nice! You can even see the proton chemical shifts in Methanol. (But Fluorine is easier.)

George H.

Vote

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