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On page 11, the technique of field modulation is explained: “Because the spectrometer is tuned to only detect signals that change amplitude as the field changes, the resultant signal appears as a first derivative.”
I don’t understand why the spectrometer is tuned in this way. They say the magnetic field is made to change by a small amount at a frequency of 100kHz. So is the field slowly changing in one direction while an EM frequency of ~100kHz is used, or is it the magnetic field itself that is made to oscillate?
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