METHOD FOR DETERMINING RADIUS OF CURVATURE OF CONCAVE OPTICAL SPHERICAL SURFACE WITH CENTRAL AXIAL HOLE BY OPTICAL RANGING METHOD

摘要

FIELD: optics.SUBSTANCE: invention is intended for determination of curvature radius of concave optical spherical surface with central axial hole at control and adjustment of optical elements. Method of measuring the radius of curvature of large-sized optical components with a central axial hole involves setting an initial position of the center of curvature of the measured mirror using any apparatus which enables to obtain autocollimating beam path passing through the center of curvature of the measured mirror. At the same time in the initial position, the light beam of the laser range finder is directed to the surface of the measured mirror within the limits of its aperture angle at an angle to the optical axis and through its center of curvature to obtain distance D1 from the range finder to the measured surface through the movable mirror. Thereafter, movable mirror is displaced, and initial position setting is repeated for mirror of known radius Ret, then movable mirror is returned to previous position, at which the laser beam of the laser range finder falls on the mirror of the known radius Ret at the same angle as for the measured surface, and passes through the center of curvature of the mirror of the known radius Ret, after which, without changing the position of the range finder, distance D2 is measured from the range finder to the measured surface of the known radius Ret through the movable mirror, by determining the unknown radius of the controlled concave optical spherical surface Rz as the difference between these two ranges, plus the value Ret, that is Rz = D1 − D2 + Ret.EFFECT: technical result is enabling measurement of concave optical spherical surfaces with a central axial hole.1 cl, 1 dwg