Abstract
A modified photon correlation spectroscopy probe is described which allows the rapid determination of the thermal diffusivity of pure transparent liquids over a wide temperature and pressure range. The system uses Rayleigh scattering of laser light arising from local statistical fluctuations of the temperature in the liquid which itself is in thermodynamic equilibrium (no macroscopic temperature gradient is required). The technique produces absolute values and provides additionally a certain criterion for the recognition of systematical distortions in the measurement in the form of deviations from the expected single exponential decay of the measured correlation function. Results are presented for toluene and methanol in an extended temperature (20–150°C) and pressure (0.1–11 MPa) range.
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