Ultrasonic Absorption Spectroscopy in Fluids by Optical Detection of Photoacoustic Pulse Profiles

@article{Tam1985UltrasonicAS,
  title={Ultrasonic Absorption Spectroscopy in Fluids by Optical Detection of Photoacoustic Pulse Profiles},
  author={Andrew C. Tam and Heinz Sontag and Wing Pun Leung},
  journal={IEEE 1985 Ultrasonics Symposium},
  year={1985},
  pages={440-442}
}
We have demonstrated a new, optical and noncontact method for ultrasonic absorption spectroscopy. A pulsed laser is used to produce a short duration photoacoustic pulse in a sample, and the acoustic pulse shapes can be monitored at different propagation distances by a focused continuous probe beam 'This pulse shape monitoring is possible since the time-dependent deflection of the probe beam is proportional to the transient refractive-index gradient associated with the acoustic pulse. Fourier… CONTINUE READING

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