With the advent of the Industry 4.0 and the custom-made manufacturing, new problems have been arisen due to the lack of a statistical set of samples for characterization. This leads to the need of using nondestructive techniques with the capability of adapting to the sample shape. Photothermal techniques are highly effective for this purpose, since it can obtain thermal properties of many materials with local resolution. Particularly, thermal diffusivity allows exposing a high contrast between the phases of a material and, through a microscopy of this property, it is possible to obtain information of the presence of clusters, pores, homogeneity, etc.
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