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Characterization of pulsed ultrasound using optical detection in Raman-Nath regime

Lecheng Jia1, Bin Xue2, Shili Chen1

  • 1State Key Laboratory of Precision Measurement Technology and Instrument, Tianjin University, Tianjin 300072, China.

The Review of Scientific Instruments
|September 7, 2018
PubMed

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A pulse is a short burst of radio waves distributed over a range of frequencies that simultaneously excites all the nuclei in the sample. Upon passing a radio frequency pulse along the x-axis, the nuclei absorb energy corresponding to their Larmor frequencies and achieve resonance. This shifts the net magnetization vector from the z-axis toward the transverse plane. This angle of rotation of the magnetization vector, or the flip angle, is proportional to the duration and intensity of the pulse.
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