FIELD: metallurgy.
SUBSTANCE: gold cylindrical nanoparticles not over 100 nm in length are sprayed onto surface of tested object, depth of the ply of said particles allowing the filling of cavities of would-be fractures. Then, said surface is dried to remove sprayed ply therefrom. Then, object surface is subjected to non-interlaced scan by fs-laser beam. At a time, intensity of two-photon luminescence signal is registered in every area under analysis to fix the location of said area corresponding to object coordinate. 2D array of two-photon luminescence signal intensities is formed to produce the map of distribution of nanoparticle luminescence intensities excited by laser radiation.
EFFECT: possibility to reveal surface defects for their early detection.
3 cl, 7 dwg
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