Simultaneous measurement of surface tension and kinematic viscosity using thermal fluctuations

T. Nishio, Y. Nagasaka

Research output: Contribution to journalArticlepeer-review

24 Citations (Scopus)


We have developed a surface laser-light scattering apparatus to measure simultaneously surface tension and kinematic viscosity. In this method, we can obtain the surface properties by the laser heterodyne detection of light scattered from thermally excited capillary waves (called "ripplon"), which are typically of low amplitude (∼1 nm) and a characteristic wavelength (∼100 μm). Two gratings (d=100 and 200 μm) were employed to select the wave number of the capillary waves and to produce a reference beam for heterodyne detection. It was found through an experimental study on water that this contact-free method has considerable potential for application to measurements under extreme conditions such as high temperatures and high pressures.

Original languageEnglish
Pages (from-to)1087-1097
Number of pages11
JournalInternational Journal of Thermophysics
Issue number5
Publication statusPublished - 1995 Sept 1


  • kinematic viscosity
  • ripplon
  • surface laser-light scattering method
  • surface tension

ASJC Scopus subject areas

  • Condensed Matter Physics


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