Comparison of Four Methods of Interferogram Reduction and Interpretation

摘要

This paper will address the problem of accurate reduction and interpretation of interferograms. Peak-to-valley wavefront deformation will be the main criterion of evaluation. Interferograms containing power, spherical aberration, coma, and astigmatism will be evaluated using four different methods. These methods will be (1) visual interpretation using a ''harp,'' (2) manual interpretation, (3) automatic digitization (Zygo Zapp), and (4) computer interpretation (fringe). The strengths and weaknesses of these methods, including cost, time, accuracy, and repeatability, will be discussed. Reference will be made to ''Optical Interferograms-Reduction and Interpretation'' an ASTM publication. 2 refs., 5 figs. (ERA citation 10:040050)