A technique for measuring the radius of curvature of a convex optical surface is described. Its functioning
is based on a lateral shearing interferometer and the observation of the collimation of a laser beam. Two
interference patterns of straight fringes are obtained, and only when the fringes are parallel is the
measurement considered. Since a previous calibration with a laser tracker or similar device is required it
is not possible to measure surfaces with radii of curvature longer than ten meters due to dimensions of the
laboratory. Details of resolution and measurement uncertainty between calibrated and noncalibrated
modes of the instrument are presented.
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