FIELD: process engineering.
SUBSTANCE: invention relates to surface control of gum-coated steel sheet. Proposed method consists in illumination of steel sheet by flat light beam linearly polarised at preset polarisation angle at incidence angle other than Brewster angle for covering the preset angle or larger. It comprises imaging of linearly polarised light beam with polarisation angle of 0 degrees at receipt angle other than angle of incidence beam mirror reflection for preset angle.
EFFECT: no need in incidence angle and receipt angle variation, higher quality of control.
6 cl, 5 dwg
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SU1721571A1 |
