Abstract

LARA-BERNAL, A.; MARIN, E.  and  CALDERON, A.. Técnica de relajación térmica con excitación variable: Caso de la "rampa" de intensidad. Superf. vacío [online]. 2007, vol.20, n.3, pp.17-20. ISSN 1665-3521.

In the thermal relaxation technique a sample is supported adiabatically in a recipient under vacuum conditions, while one of its surfaces is illuminated uniformly at the same time that the temperature, T, of the opposite surface is measured as a function of time, t. From the dependence T(t) the value of the specific heat capacity, C, can be determined. In this work we have calculated T(t) in the case of variable illumination, specifically for a ramp of light intensity I, of the form I=I₀t, where I₀ is a constant. On the basis of mathematical simulations we have discussed the advantages of this variant when compared with the case of constant illumination.

Keywords : Thermal relaxation; Heat transfer; Specific heat; Thermal properties.