New methodology for thermal parameter measurements in solids using photothermal radiometry

Abstract

The photothermal radiometry (PTR) signal is analyzed in order to simultaneously obtain the thermal diffusivity and effusivity of solid materials. Analytical procedures that allow the determination of the thermal parameters via a frequency scan of the amplitude or the phase of the PTR signal are presented. The measurement procedures do not involve a multiparameter-fit optimization algorithm. The methods have been used for the measurement of thermophysical properties of vitreous carbon and lead-itanate-zirconate ceramic samples.

Time Varying Heat Conduction in Solids

“…The theoretical obtained results for higher frequencies [Marín et al, 2010] showed in part (b) of the same figure that the frequency intervals with amplitude ratios greater than unity are awaited to appear in a periodical manner, a typical result for wave phenomena. A similar result has been reported by Depriester et al [Depriester et al, 2005] in the context of the photothermal infrared radiometry technique, and by Caerels et al [Caerels et al, 1998], Longuemart et al and Sahraoui et al ) using a photopyroelectric (PPE) technique. The measurement configuration is very similar as that described above for the PA method.…”

Combined FPPE–PTR Calorimetry Involving TWRC Technique. Theory and Mathematical Simulations

“…Concerning the PTR technique, it was largely used in the past, together with the frequency scan method, for calorimetric investigations of solid samples [15][16][17][18][19][20]. In such type of investigations, the irradiated layer is a thermally thin and opaque solid, and the normalization of the PTR signal involves some known thermally thick backings.…”

Investigation of “Thermal Touch” Response of Coated Steel Plates Employing Square-Wave-Excited Photothermal Infrared Radiometry

“…Besides the determination of the thermal effusivity of substrates [1,2], the technique has also been used to investigate the effective thermal diffusivity of layered systems [3], and to determine the thermal properties of coatings [4,5], slabs and plates [6,7], and subsurface structures [8]. The information content of IR photothermal frequency spectra is so rich that the signals can be used for depth profiling [9,10].…”