Optimum wavelength selection for the method of excess fractions

Konstantinos Falaggis; David P. Towers; Catherine E. Towers

doi:10.1117/12.795211

11 August 2008 Optimum wavelength selection for the method of excess fractions

Konstantinos Falaggis, David P. Towers, Catherine E. Towers

Proceedings Volume 7063, Interferometry XIV: Techniques and Analysis; 70630V (2008) https://doi.org/10.1117/12.795211
Event: Optical Engineering + Applications, 2008, San Diego, California, United States

Abstract

In this paper, we present an understanding of the failure modes of excess fractions solutions to multi-wavelength interferometry. From this basis, an approach to select optimum measurement wavelengths has been introduced. A practical fiber optic sensor has been constructed for simultaneous detection of the intensity at four measurement wavelengths. The system has been demonstrated using two wavelength selections that are very near the optimal configuration and the data analyzed using an excess fractions solver. Initial results have shown a measurement range of 17 mm with reliable and robust absolute metrology from a system with a phase noise of 1/200th of a fringe. This corresponds to an overall dynamic range of 1 part in 2×10⁶.

Citation Download Citation

Konstantinos Falaggis, David P. Towers, and Catherine E. Towers "Optimum wavelength selection for the method of excess fractions", Proc. SPIE 7063, Interferometry XIV: Techniques and Analysis, 70630V (11 August 2008); https://doi.org/10.1117/12.795211

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