Corrosion in metal structures is one of the prevailing problems impacting automobile, cargo, and construction industries. The detection of corrosion at the right time and determination of the root cause are crucial in its prevention and control. In this context, we propose hyperspectral imaging as a potential imaging modality for monitoring corrosion. This technique is very relevant for high-speed, non-destructive inspection. The proposed hyperspectral imager can efficiently monitor corrosion with high sensitivity and it enables corrosion detection even at human inaccessible areas with the aid of a custom fabricated fiber optic probe. In contrast to traditional methods, the hyperspectral imaging technique can capture reflectance at several wavelengths from several spatial points of the sample and hence provides a means of rigorous analysis of the sample reflectance. Using a two dimensional to one dimensional fiber bundle reformatter, hyperspectral images of metal samples were recorded. Induced corrosion in the sample was monitored by the hyperspectral imager and the data recorded were processed to form the three-dimensional spectral datacube. Obtained results show that hyperspectral reflectance imaging is a powerful tool for corrosion monitoring, non-destructively.
In the present work, we report optical and nonlinear optical properties of Ag - Polyvinyl alcohol polymer films
prepared through a chemical method. Optical absorption measurements show the surface plasmon resonance (SPR)
around 410 nm. The SPR intensity increases with annealing temperature. Open aperture z-scan measurements done using
100 femtosecond laser pulses at 400 nm show an intensity dependent nonlinear light transmission behavior.
Cobalt doped zinc oxide nanostructures were prepared in room temperature through a wet chemical method. X-Ray
diffraction studies confirm that the prepared particles have a hexagonal wurtzite structure. The morphology of the
particles is found from Scanning Electron Microscopy. Optical absorption measurements reveal the presence of an
exciton peak at 375 nm (3.31 eV). Excitation at 330 nm shows photoluminescence arising from exciton recombination
and oxygen vacancies. Open aperture z-scan measurements using 5 ns laser pulses at 532 nm reveal an optical limiting
behavior arising from three-photon absorption, which gets enhanced for higher concentrations of Co.
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