DISTRIBUTION ANALYSIS OF REAL RAY COORDINATES ON OPTICAL SYSTEM ENTRANCE PUPIL FOR WAVE ABERRATION APPROXIMATION BY ZERNIKE POLYNOMIALS

 Subject of Research.The paper deals with description of optical system wave aberration by Zernike polynomials. We perform the search of suitable point distribution (real ray coordinates on optical system entrance pupil) for the least squares method approximation. Six possible types of distribution are considered. The conclusion on their advantages and disadvantages is drawn. Method. The method essence lies in various types of distribution research for real rays on entrance pupil that allow for necessary accuracy with minimum rays number. Main Results. We compare standard deviation between the reference wave front and result wave front after approximation by Zernike polynomials by the least squares method for several types of point distribution (real ray coordinates) on optical system entrance pupil. The best types of distribution with maximum convergence are determined. Practical Relevance. The discussed distribution of points can be useful for ray tracing calculation through optical system for the further wave front reconstruction by Zernike polynomials. The usage of optimal point distribution can reduce the number of rays necessary for wave front reconstruction that increases drastically calculation speed.

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