Characterization of Precision Spheres With XCALIBIR
Ulf Griesmann, Johannes A. Soons, Quandou (. Wang
The geometry of a nearly spherical surface, for example that of a precision optic, is completely determined by the radius-of-curvature at one point and the deviation from the perfect spherical form at all other points of the sphere. Measurements of radius and form error can now be made with interferometers to remarkable accuracy. To measure the radius, a variant of the well known interferometric radius bench method is used. Careful alignment of phase measuring and displacement measuring interferometers enables us to achieve a standard measurement uncertainty for the sphere radius of about five parts in 10 7. The measurement of the form error is complicated because the entire sphere surface cannot be imaged in one measurement. Instead, 138 overlapping areas of the sphere surface are measured. A stitching algorithm is then employed to assemble these measurements into a form error map for the entire surface.
Frontiers in Optics Conference 2004
October 10-14, 2004
Frontiers in Optics Conference 2004, OSA Technical Digest