Characterization of back surface morphology for corrosion detection using patterned heat sources

Abstract

Characterization of back surface roughness is investigated for specimens exhibiting corrosion and for prepared samples with milled channels of varying geometry. An area heating source is used initially to provide one-dimensional heating of the specimen which allows plate thinning, disbanding, or presence of corrosion to be rapidly detected. A focused heating source is then used to characterize the suspect regions through the interaction of lateral heat flow with back surface roughness.

Comparing time-resolved infrared thermography and X-ray computed tomography in distinguishing soil surface crusts

“…The shape of this relation is similar to the curves obtained by Spicer et al (1994) applying this technique to study back surface corrosion of aluminum plates.…”

“…If Γ = 0, the top and bottom layers have the same thermal inertia, which can be considered as an infinite half space (Maldague, 2001). In industrial applications, tT is found to correlate to the specimen thickness, while the slope of the linear phase relates inversely to thermal inertia (termed "effusivity" in industrial contexts); the method does not appear to be sensitive to spatial variability of surface emissivity of the specimen (Spicer et al, 1994).…”