Abstract
The long trace profiler (LTP) is proposed to measure radius of curvature (R)
and surface figure of a longradius spherical surface in an optical shop. Equipped
with a motorized rotary stage and a two-dimensional tilt stage, the LTP scans the
full aperture and calculates the absolute radius of curvature of each scanning line
based on the least square method. Nonlinear error and manufacture error difference
between center and the edge are obtained by comparing R results. The R-limit is
validated and expressed as D/R, where D is the aperture of the mirror under test. A
full-aperture three-dimensional figure is also reconstructed based on triangle
interpolation.
© 2011 Chinese Optics Letters
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