Artículos de revistas
Theoretical description of the photopyroelectric technique in the slanted detector configuration for thermal diffusivity measurements in fluids
Registro en:
Thermochimica Acta. Elsevier Science Bv, v. 582, n. 101, n. 105, 2014.
0040-6031
1872-762X
WOS:000335288000014
10.1016/j.tca.2014.03.006
Autor
Rojas-Trigos, JB
Marin, E
Mansanares, AM
Cedeno, E
Juarez-Gracia, G
Calderon, A
Institución
Resumen
Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) This work presents an extended description about the theoretical aspects related to the generation of the photopyroelectric signal in a recently proposed wedge-like heat transmission detection configuration, which recreates the well-known Angstrom method (widely used for solid samples) for accurate thermal diffusivity measurement in gases and liquids. The presented model allows for the calculation of the temperature profile detected by the pyroelectric sensor as a function of the excitation beam position, and the study of the influence on it of several parameters, such as spot size, thermal properties of the absorber layer, and geometrical parameters of the measurement cell. Through computer simulations, it has been demonstrated that a narrow temperature distribution is created at the sensor surface, independently of the lateral diffusion of heat taking place at the sample's surface. (C) 2014 Elsevier B.V. All rights reserved. 582 101 105 COFAA-IPN, Mexico, through the SIBE and PIFI Programs Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) [SIP-IPN-1491] [CONACyT-83289] [CONACyT-2011-01-174247] Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) [SIP-IPN-1491] [CONACyT-83289] [CONACyT-2011-01-174247]