New infrared radiation temperature measurement system applied to the Laser Flash Method

7th Brazilian Congress on Metrology

Camarano, D.M.^1 ; Alves, F.F.^2 ; Finelli, I.^2 ; Migliorini, F.L.^1 ; Miranda, O.^1 ; Grossi, P.A.^1

Centro de Desenvolvimento da Tecnologia Nuclear (CDTN), Comissão Nacional de Energia Nuclear (CNEN), Campus da UFMG-Pampulha, Av. Presidente Antônio Carlos 6627, Belo Horizonte

CEP 30.161-970, MG, Brazil^1

Universidade Federal de Minas Gerais, Departamento de Engenharia Elétrica, Campus Pampulha, Belo Horizonte, MG

CEP 31.270-901, Brazil^2

关键词: Computational implementations;    Diffusivity measurements;    Homogeneous materials;    Laser flash methods;    Radiation temperature;    Relative deviations;    Temperature measurement systems;    Temperature transients;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/575/1/012020/pdf
DOI  :  10.1088/1742-6596/575/1/012020

来源: IOP

【 摘 要 】

The laser flash method is based on measuring the temperature transient. The effect of the thermal inertia of the temperature measurement system is not negligible and cannot be ignored due to the fast dynamics of the measured thermal transient. This paper presents the new infrared radiation temperature measurement system applied to the thermal diffusivity measurements based on the laser flash method. The developed system consists in a detector cooled in liquid nitrogen, collimating lenses and a mathematical modeling developed in LabView. As a result, the generated electrical signal is converted into temperature. A detailed description of this new temperature measurement system is presented, as well as its mathematical model, computational implementation and calibration. For validate the new system, reference samples of homogeneous materials (Pyroceram 9606 and Inconel 600) were tested and the results of thermal diffusivities were compared with its reference certificates. The thermal diffusivity values measured by using the new system are in agreement with reference values, with less than 2 % of relative deviation.