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Fringe Analysis versus Phase Measuring Interferometry

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Fringe Analysis versus Phase Measuring Interferometry

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This technical note explains the analytical and practical difference between fringe analysis and phase-shifting interferometry. Interference patterns may be analyzed a number of different ways. The two most common are Fringe Analysis and Phase Measuring Interferometry. There are fundamental differences between these two methods and as a result, differences should be expected in the results calculated, such as PV(peak-to-valley) or RMS (rootmean-square).

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