Development of the front-detection photopyroelectric (FPPE) configuration for thermophysical study of glass-forming liquids

摘要: We report on the first frequency-dependent measurements of thermal effusivity glass-forming liquids using photopyroelectric (PPE) method. The advantage is higher modulation frequency capability than with previously reported methods. On basis our present results (up to 30 kHz), we find in dispersion temperature region glycerol a clear frequency-dependence real part and non-zero, imaginary effusivity, which consistent literature data. experimental data reveal that full exploitation high-frequency requires take into account also piezoelectric component signal caused by thermoelastic response sample. limit this PPE experiment may be extended modified cell design another pyroelectric material instead lithium tantalate crystalline sensor.