Interferometric testing of large optics in the presence of vibration

Peter L. Wizinowich; D'nardo Colucci

doi:10.1117/12.19233

1 July 1990 Interferometric testing of large optics in the presence of vibration

Peter L. Wizinowich, D'nardo Colucci

Proceedings Volume 1236, Advanced Technology Optical Telescopes IV; (1990) https://doi.org/10.1117/12.19233
Event: SPIE Astronomical Telescopes and Instrumentation for the 21st Century, 1990, Tucson, AZ, United States

Abstract

A modification to the usual phase-shifting interferometry algorithm permits measurements to be taken fast enough to essentially freeze out vibrations. Only two interferograms are time critical in this 2 + 1 algorithm; the third is a null. An error analysis has been performed for this new algorithm. The implemented system acquires the two time-critical interferograms with a 1-msec separation, on either side of the interline transfer of a standard CCD video camera, resulting in a reduction in sensitivity to vibration of one to two orders of magnitude. The required phase shift is achieved via frequency shifting.

Citation Download Citation

Peter L. Wizinowich and D'nardo Colucci "Interferometric testing of large optics in the presence of vibration", Proc. SPIE 1236, Advanced Technology Optical Telescopes IV, (1 July 1990); https://doi.org/10.1117/12.19233

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