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In this paper, according to the features of easy distortion and scratch for aspheric plastic lens, a non-contact measuring method is raised to test error in shape of the lens. Namely, the distance between atemplate and its image reflected with tested lens can be measured in nearly the vertical direction of the lensaxis when the two-dimensional (2D) template is put near the measured surface. Then, the outline of thecentral cross-section could be obtained by calculating and curve fitting. Furthermore, three-dimensional(3D) surface can be imitated through rotating the component. A new fitting method of drift measurementis presented to prevent reducing precision when the lens and the template are fixed. The template isadjusted according to the position of the lens. The measurement precision is in the order of magnituedof sub-microns. Rotationally symmetric convex aspheric surface with any angle can be measured by thismethod.
In this paper, according to the features of easy distortion and scratch for aspheric plastic lens, a non-contact measuring method is raised to test error in shape of the lens. Namely, the distance between atemplate and its image reflected with tested lens can be measured in nearly the vertical direction of the lens axis when the two-dimensional (2D) template is put near the measured surface. Then, the outline of the central cross-section could be obtained by calculating and curve fitting. A new fitting method of drift measurementis presented to prevent reducing precision when the lens and the template are fixed. The template isadjusted according to the position of the lens. The measurement precision is in the order of magnituedof sub-microns. Rotationally symmetric convex aspheric surface with any angle can be measured by this method.