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Proceedings Paper

Interferometric testing of large optics in the presence of vibration
Author(s): Peter L. Wizinowich; D'nardo Colucci
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Paper 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.

Paper Details

Date Published: 1 July 1990
PDF: 12 pages
Proc. SPIE 1236, Advanced Technology Optical Telescopes IV, (1 July 1990); doi: 10.1117/12.19233
Show Author Affiliations
Peter L. Wizinowich, Steward Observatory/Univ. of Arizona (United States)
D'nardo Colucci, Steward Observatory/Univ. of Arizona (United States)


Published in SPIE Proceedings Vol. 1236:
Advanced Technology Optical Telescopes IV
Lawrence D. Barr, Editor(s)

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