Measurement of the thermal properties of liquid mixtures using a thermal wave interferometer

In this paper we discuss the use of an alternative photothermal technique f or measurements of thermal properties of liquid mixtures. The proposed tech nique is based upon the concept of a thermal wave interferometer. The liqui d sample is confined between two thin pyroelectric detectors. One of these detectors acts as a modulated light absorber while the other is used for se nsing the temperature fluctuations transmitted through the liquid layer. It is demonstrated that the proposed experimental configuration allows us to fully characterize the thermal properties of the constituent liquids.