Comparison Of Harmonic Weighting, Fitting, And Crossing Points For Locating Optical Interference Fringes

William Primak

doi:10.1117/12.938599

25 November 1986 Comparison Of Harmonic Weighting, Fitting, And Crossing Points For Locating Optical Interference Fringes

William Primak

Author Affiliations +

Proceedings Volume 0661, Optical Testing and Metrology; (1986) https://doi.org/10.1117/12.938599
Event: 1986 Quebec Symposium, 1986, Quebec City, Canada

Abstract

The problem in precisely locating a fringe in an interference pattern is that the light intensity varies so gradually in the regions of the maxima and minima. Such devices as logarithmic weighting and half-shades have been used in the past. Here, the methods of fitting the fringe intensity profile, harmonic weighting (which converts the fringe profile into a sawtooth), and using the mid-intensity crossing points (where the intensity varies most steeply) are compared, and their precisions in the presence of statistical errors are described. The implications for practical measurement are discussed.

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William Primak "Comparison Of Harmonic Weighting, Fitting, And Crossing Points For Locating Optical Interference Fringes", Proc. SPIE 0661, Optical Testing and Metrology, (25 November 1986); https://doi.org/10.1117/12.938599

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