Abstract

A ronchigram is captured in the optical workshop with a charge-coupled device (CCD) camera with 256256 pixels. The image of this ronchigram is processed by a micro-computer for smoothing and fringe-peak detection.¹ The resulting fringe skeleton is sampled, and the sampled data are subsequently fed into a least-squares data reduction program.² Preliminary tests for a 15 cm, f/2.3 paraboloid showed a /10 peak to valley and a/100 RMS repeatability. The whole testing procedure takes less than 8 min.

© 1990 Optical Society of America