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Journal of the Optical Society of Korea

Journal of the Optical Society of Korea


  • Vol. 13, Iss. 2 — Jun. 25, 2009
  • pp: 261–266

Angular Dispersion-type Nonscanning Fabry-Perot Interferometer Applied to Ethanol-water Mixture

Jae-Hyeon Ko and Seiji Kojima  »View Author Affiliations

Journal of the Optical Society of Korea, Vol. 13, Issue 2, pp. 261-266 (2009)

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The angular dispersion-type non-scanning Fabry-Perot was applied to an ethanol-water mixture in order to investigate its acoustic properties such as the sound velocity and the absorption coefficient. The scattered light from the mixture was analyzed by using the charge-coupled-device area detector, which made the measurement time much shorter than that obtained by using the conventional scanning tandem multi-pass Fabry-Perot interferometer. The sound velocity showed a deviation from ultrasonic sound velocities at low temperatures accompanied by the increase in the absorption coefficient, indicating acoustic dispersion due to the coupling between the acoustic waves and some relaxation process. Based on a simplified viscoelastic theory, the temperature dependence of the relaxation time was obtained. The addition of water molecules to ethanol reduced the relaxation time, consistent with dielectric measurements. The present study showed that the angular dispersion-type Fabry-Perot interferometer combined with an area detector could be a very powerful tool in the real-time monitoring of the acoustic properties of condensed matter.

© 2009 Optical Society of Korea

OCIS Codes
(120.2230) Instrumentation, measurement, and metrology : Fabry-Perot
(120.6200) Instrumentation, measurement, and metrology : Spectrometers and spectroscopic instrumentation
(290.5830) Scattering : Scattering, Brillouin
(300.6330) Spectroscopy : Spectroscopy, inelastic scattering including Raman

Original Manuscript: April 30, 2009
Revised Manuscript: January 1, 2009
Manuscript Accepted: June 2, 2009
Published: June 25, 2009

Jae-Hyeon Ko and Seiji Kojima, "Angular Dispersion-type Nonscanning Fabry-Perot Interferometer Applied to Ethanol-water Mixture," J. Opt. Soc. Korea 13, 261-266 (2009)

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