Contact measurement of substrate temperature in irradiated areas using photoinduced thermocapillary convection in a thin transparent liquid layer

Abstract

A new approach to the contact measurement of temperature in thin layers of transparent liquids on a solid substrate is proposed, which employs the phenomenon of photoinduced thermocapillary (TC) convection. The method is based on the fact that, when the TC convection is excited by light at various points of a homogeneous liquid layer of uniform thickness, equal diameters of the TC response imply equal temperatures of the substrate. Accordingly, it is possible to provide the controlled compensation of heat losses in a contact temperature sensor. The experimental data obtained using three temperature sensors show that the results of measurements are independent of the sensor type and size.