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Comparison of Data for Thermal Diffusivity Obtained by Laser‐Flash Method Using Thermocouple and Photodetector
Author(s) -
Lee Honc Lim,
Hasselman D.P.H.
Publication year - 1985
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1985.tb15255.x
Subject(s) - thermocouple , laser flash analysis , materials science , thermal diffusivity , flash (photography) , photodetector , laser , ceramic , composite material , thermal , flash lamp , temperature measurement , optics , transient (computer programming) , optoelectronics , thermal conductivity , thermodynamics , physics , computer science , operating system
Thermal diffusivities of cordierite glass and glass‐ceramics measured by the laser‐flash method using remote optical sensing to monitor the transient temperature of the specimen were higher than those obtained with a thermocouple. The latter data were thought to be lower because of thermal contact resistance, the heat capacity of the cement used to adhere the thermocouple, and heat loss along the thermocouple wire. It is concluded that remote optical sensing yields more reliable data.