METHOD OF OPTIMUM WAVELENGTH DETERMINING FOR INSPECTING OPHTHALMIC LENSES Russian patent published in 2016 - IPC G01M11/02 G01N21/95 

FIELD: physics.

SUBSTANCE: method includes measurement of transmission of several different wavelengths through lens of different previously known thickness; calculating coefficient k, which is constant in expression for Beer-Lambert law %T=10^(2-kt), where %T is value of transmission, t is thickness of ophthalmic lenses for each wavelength, obtaining first values of contrast subtracting transmission value at specified depth of defect without passing through whole thickness of lens of value of transmission with no lens to above said several wavelengths; obtaining second values of contrast subtracting transmission value at maximum thickness being thickness of finished lens transmission value at specified depth of defect for said several wavelengths; comparison of first and second values of contrast and selection of their minimum values at each wavelength, and plotting dependence of minimum contrast wavelength values; selection of wavelength for checking on curve at maximum peak.

EFFECT: technical result is provision of optimum selection of wavelength at reduced time of selection.

8 cl, 3 dwg