Abstract

This paper evaluates the application of a dual frequency interferometric technique for simultaneous temperature and concentration measurements in liquids. All of the measurements were made using the classical Mach-Zehnder interferometer with a tunable laser light source. Measurements were made in a stably stratified aqueous salt water column heated from below. Interferograms were acquired at two laser light source wavelengths: λ₁ = 476.5 nm and λ₂ = 514.5 nm. It has been demonstrated that dual wavelength interferometric techniques have limited applications in liquids. The technique was found to yield satisfactory results for test conditions corresponding to a combination of low temperature and high concentration gradients. For other test conditions, the measured errors were large due to inadequate separation in the light source wavelengths.

© 1990 Optical Society of America

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