This effect is used in Earth's field NMR spectrometers and other instruments, because these instruments are portable and inexpensive, they are often used for teaching and field work. But is is necessary for the sample to be put inside a chamber, to measure the NMR. They can't detect any external NMR. It is simply impossible.
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By using a self contained exciting force, there are hand held instruments similar in shape and size to a heat senor that can give you a remarkably accurate read out of quantity and quality of minerals etc that are inside of a core prior to actual assaying. Obviously this is outside of the instrument.
Don Jose de La Mancha
"I exist to Live, not live to exist".
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