A simple ball averager for reference sphere calibrations

Ulf Griesmann; Quandou Wang; Johannes Soons; Remi Carakos

doi:10.1117/12.614992

19 August 2005 A simple ball averager for reference sphere calibrations

Ulf Griesmann, Quandou Wang, Johannes Soons, Remi Carakos

Proceedings Volume 5869, Optical Manufacturing and Testing VI; 58690S (2005) https://doi.org/10.1117/12.614992
Event: Optics and Photonics 2005, 2005, San Diego, California, United States

Abstract

When measuring the form errors of precision optics with an interferometer, calibration of the reference wavefront is of central importance. In recent years, ball averaging, or random ball testing, has emerged as a robust method for calibrating spherical reference wavefronts in converging beams. We describe a simple instrument, consisting of an air bearing and two electric motors, that can rotate the test ball around three axes as required for a ball averaging test. The performance of the instrument is demonstrated by using it to calibrate a concave transmission sphere. Further we discuss the effects of image sampling at random locations or on uniform grids, and the effect of correlated measurements. Finally, we describe a method to determine the number of measurements which are sufficient for a ball averaging calibration.

Citation Download Citation

Ulf Griesmann, Quandou Wang, Johannes Soons, and Remi Carakos "A simple ball averager for reference sphere calibrations", Proc. SPIE 5869, Optical Manufacturing and Testing VI, 58690S (19 August 2005); https://doi.org/10.1117/12.614992

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