Precision Measurement Techniques of Thermophysical Properties

-Thermal Conductivity/Thermal Diffusivity, Specific Heat Capacity, and Thermal Expansion-

Abstract

Thermophysical properties are widely used in thermal design for saving energy and safety and security. In order to secure reliability in these areas, the National Metrology Institute of Japan (NMIJ) has developed some precision measurement techniques. This paper describes details of the guarded hot-plate method for thermal conductivity, the flash method for thermal diffusivity, the adiabatic calorimetric method for specific heat capacity and the optical heterodyne interferometric method for thermal expansion coefficient. These methods give SI traceable thermophysical property values and well evaluated uncertainties.