FIELD: physics.
SUBSTANCE: in the claimed method of controlling the surface on the background surface, a piece with a controlled surface facing the light source is placed, illuminating the monitored surface with an oblique directed light beam having colour, and observing the defects of the controlled surface with the additive mixing of the controlled surface colour and the oblique light beam colour.
EFFECT: increasing the productivity of the surface controlling process.
2 dwg
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