The application of nuclear magnetic resonance (NMR) spectroscopy to probe liquids in stream of commerce containers is described.  The most challenging part of this work is the recovery of NMR signals from non-ferrous metal containers.  In comparison to traditional high resolution NMR spectroscopy, this container limitation requires the application of lower magnetic fields, lower associated radio frequencies w, and higher radio frequency amplitude w1.  These particular NMR parameter choices are the ideal recipe for non-linear effects such as the Bloch-Siegert shift that scales with the ratio (w1/w)n, where n = 1.  This scaling factor increases in comparison to traditional NMR by three orders of magnitude by operation at a moderate magnetic field strength and elevated rf power and makes the design and use of NMR analogues of non-linear laser spectroscopy, where n > 1 feasible for the first time.

From liquid discrimination to spectroscopic analogs: Novel applications of nuclear magnetic spectroscopy

245th National Meeting (2013)

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