Theory and practice of a fringe-counting thickness-uniformity test device for IR flats, domes, and conformal windows

Daniel D. Barber; David J. Erickson

doi:10.1117/12.139233

15 December 1992 Theory and practice of a fringe-counting thickness-uniformity test device for IR flats, domes, and conformal windows

Daniel D. Barber, David J. Erickson

Author Affiliations +

Proceedings Volume 1776, Interferometry: Surface Characterization and Testing; (1992) https://doi.org/10.1117/12.139233
Event: San Diego '92, 1992, San Diego, CA, United States

Abstract

A technique for combining Newton fringe interferometry with scanning methods to characterize unique optical elements is discussed. The approach uses a converging beam as a probe and observes the Newton fringe pattern formed by the interaction between the front and rear surface reflections of the optic under test. The result is a direct measurement of the optical thickness profile of the component. The technique is well suited to the characterization of windows, domes, conformal windows, and mild corrector plates.

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Daniel D. Barber and David J. Erickson "Theory and practice of a fringe-counting thickness-uniformity test device for IR flats, domes, and conformal windows", Proc. SPIE 1776, Interferometry: Surface Characterization and Testing, (15 December 1992); https://doi.org/10.1117/12.139233

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