Detection and research of radiative adiabatic interaction by modulation polarimetry

The radiative interaction of two arbitrary substances in the near field with different chemical potentials causes each of them inhomogeneous temperature distribution and corresponding mechanical stresses. The emerging optical anisotropy in the form of linear birefringence becomes available for registration by the optical method. The kinetics and dynamics of elastic stresses in magnitude and sign of the phase difference between orthogonal components of linearly polarized radiation were recorded in an optical detector and researched by modulation polarimetry. The detectability of modulation polarimetry ensured the recording of mechanical stresses under conditions of radiation cooling-heating of the optical detector by fractions of a degree Celsius. The stress kinetics in the observation coordinate demonstrates an amplitude of complex shape. The interpretation of the dependences of mechanical stresses on time is based on the previously developed method of mathematical simulation of these dependencies. It can be used to analyze and study heat transfer components (radiative, conductive, and convective components) and determine their parameters. The measurement results are of practical importance in diagnosing the radiation component of the heat transfer of materials and determining such technically important characteristics as heat transfer coefficients and thermal diffusivity.