Detection of acoustic waves by NMR using a radiofrequency field gradient |
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Authors: | Madelin Guillaume Baril Nathalie Lewa Czeslaw J Franconi Jean Michel Canioni Paul Thiaudiére Eric de Certaines Jacques D |
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Affiliation: | Magnetic Resonance Center, University of Rennes 1 and Centre Eugène Marquis, Rennes, France. |
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Abstract: | A B(1) field gradient-based method previously described for the detection of mechanical vibrations has been applied to detect oscillatory motions in condensed matter originated from acoustic waves. A ladder-shaped coil generating a quasi-constant RF-field gradient was associated with a motion-encoding NMR sequence consisting in a repetitive binomial 13;31; RF pulse train (stroboscopic acquisition). The NMR response of a gel phantom subject to acoustic wave excitation in the 20-200 Hz range was investigated. Results showed a linear relationship between the NMR signal and the wave amplitude and a spectroscopic selectivity of the NMR sequence with respect to the input acoustic frequency. Spin displacements as short as a few tens of nanometers were able to be detected with this method. |
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