High-resolution simultaneous photothermal measurements of thermal parameters at a phase transition with the photopyroelectric technique
M. MarinelliDipartimento Ingegneria Meccanica, 2° Università di Roma ‘‘Tor Vergata,’’ via E. Carnevale, 00173 Roma, ItalyU. ZammitDipartimento Ingegneria Meccanica, 2° Università di Roma ‘‘Tor Vergata,’’ via E. Carnevale, 00173 Roma, ItalyF. MercuriDipartimento Ingegneria Meccanica, 2° Università di Roma ‘‘Tor Vergata,’’ via E. Carnevale, 00173 Roma, ItalyR. PizzoferratoDipartimento Ingegneria Meccanica, 2° Università di Roma ‘‘Tor Vergata,’’ via E. Carnevale, 00173 Roma, Italy
1992en
ABI
Annotatsiya
Photothermal techniques allow, under particular experimental conditions, the simultaneous determination of specific heat, thermal conductivity, and thermal diffusivity. A comparison has been made between measurements performed with the gas-microphone (P) configuration and the photopyroelectric (PPE) one at a liquid-crystal second-order phase transition. An increase in the sensitivity with respect to thermal parameter variation has been observed in the case of PPE.
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