Three-flat test solutions based on simple mirror symmetry.

  title={Three-flat test solutions based on simple mirror symmetry.},
  author={Ulf Griesmann},
  journal={Applied optics},
  volume={45 23},
In interferometric surface and wavefront metrology, three-flat tests are the archetypes of measurement procedures to separate errors in the interferometer reference wavefront from errors due to the test part surface, so-called absolute tests. What is believed to be a new class of solutions of the three-flat problem for circular flats is described in terms of functions that are symmetric or antisymmetric with respect to reflections at a single line passing through the center of the flat surfaces… CONTINUE READING