<title>Thermographic analysis of the anisotropy in the thermal conductivity of composite materials</title>

3-D thermal modelling applied to stress-induced anisotropy of thermal conductivity

“…Various experimental devices have been found in the literature: optical beam deflection (Monzyk [15]), thermoreflectance (Li [16]), pulsed heating (Fournier [6]) are the most used, and infrared thermography is sometimes chosen as measurement tool of the thermal signal (Burleigh [17]). Photothermal thermography, under modulated laser stimulation at the front face of the sample, has been chose here: series of images are recorded by a focal plane array camera, and experimental amplitude and phase maps are obtained thanks to a lock-in procedure.…”

Determining thermal diffusivity components in thick anisotropic composites by IR thermography

“…The same requirement exists when applying the Parker technique. Q m is the maximum heat power density (in the center of the heat flux) 4) ∆X and ∆Y are the numerical grid spatial steps 5) ∆τ calc is the ThermoCalc-6L calculation step specifies slit-mask heating with P being the period Due to peculiarities of the Fourier transformation, both the size of the heating spot and the size of the sample must be considered. It may be seen in Table 2, cases 6 and 7, that using a 50x50 mm square-heating mask on a 100x100 mm sample produces a negative diffusivity value at the 2 nd Fourier frequency.…”