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International Journal of Thermophysics

, Volume 16, Issue 1, pp 1–9 | Cite as

Measurement of the thermal diffusivity and speed of sound of hydrothermal solutions via the laser-induced grating technique

  • T. J. Butenhoff
Article

Abstract

We use the laser-induced grating technique to measure the thermal difusivity and speed of sound of hydrothermal solutions. In this noninvasive optical technique, a transient grating is produced in the hydrothermal solution by optical absorption from two crossed, time-coincident nanosecond laser pulses. The grating is probed by measuring the diffraction efficiency of a third laser beam. The grating relaxes via thermal diffusion, and the thermal diffusivity is determined by measuring the decay of the grating diffraction efficiency as a function of of the pump-probe delay time. In addition, intense pump pulses produce counterpropagating acoustic waves that appear as large undulations in the transient grating decay spectrum. The speed of sound in the sample is simply the grating fringe spacing divided by the undulation period. The cell is made from a commercial high-pressure fitting and is equipped with two diamond windows for optical access. Results are presented for dilute dye/water solutions withT=400° and pressures between 20 and 70 MPa.

Key words

hydrothermal laser-induced grating speed of sound thermal diffusivity transient grating 

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Copyright information

© Plenum Publishing Corporation 1995

Authors and Affiliations

  • T. J. Butenhoff
    • 1
  1. 1.Los Alamos National LaboratoryLos AlamosUSA

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