Speaker
Description
The application of the laser-spot active lock-in infrared thermography technique in a front
detection configuration for the simultaneous measurement of the thermal conductivity (k)
and diffusivity (D) of isotropic solids taking advantage of the heat losses by conduction
from the sample to the surrounding air has been reported recently []. In this method, an
intensity periodically modulated laser beam focused on the sample´s surface is partially
absorbed and transformed into heat so that thermal waves are generated that propagate
radially from the heating point. They are imaged using a thermographic camera at the same
surface where the excitation took place. Video-thermograms are recorded at the light
modulation frequency, from which amplitude and phase-shift profiles are obtained by lock-
in processing as a function of the radial distance from the heating point. These profiles are
then fitted with the help of a theoretical model to obtain k and D. However, the method is
limited to thermal insulators for which a large mismatch between their thermal diffusivities
and that of air exists so that for good conductors only the latter parameter can be recovered.
Reference
Título: "Memory Technologies for Embedded Systems"
Capítulo: "Static Random-Access Memory (SRAM)"
Autores: Karen Panetta, Adam Hoskins
Fuente: Embedded Systems Design with Special Functions, CRC Press
Año: 2017
This work was supported by
instituto politecnico nacional, cicata , unidad legaria
| Keywords | lock-in thermography diffusivity conductivity measurement |
|---|---|
| Author approval | I confirm |
| Author will attend | I confirm |
