Abstract
TiO2 thin film thickness is measured after each layer of coatings by laser speckle photography. TiO2 thin film coatings are carried out on the steel substrate in a periodical way by the spin coating method. At the time t1, the first layer coating scatters the coherent laser and develops the self-interference pattern of an image called speckle, which is captured and auto-correlated. After time t2, the speckle image is recorded by CCD and cross-correlated with the previous one. There is pixel distance movement and it is computed by image processing. This speckle imaging practice gives 8 µm as the thickness of the second layer of Tio2 film coating. Hence, the shift of pixel distance gives the thickness of the multilayer sample coatings in a satisfactory manner.
Published Version
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