27 September 1999 Interpolating method with frequency window function for illumination analysis
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Abstract
A new method for calculating the irradiance of the broad area illuminated by the extended incoherent light source through an optical system is proposed. In this method, PSF with a frequency window function is attempted to be used to save time in the calculation of the irradiance distributions of the illuminated area. The efficiency of this method is remarkable for practical optical design work, especially for illumination optical systems. The interpolation formula of PSF can be obtained by an inverse Fourier transformation of the geometric optical transfer function, which is band- limited in a certain range of spatial frequency. The boundary of the range sets the cuff-off frequency. The frequency window function with the shape automatically controlled is used for adequately limiting or suppressing the high frequency components. A simulation of a point image and an example of an application for a practical illumination analysis by this method are reported.
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Tohru Kusakawa, Tohru Kusakawa, Zenta Ushiyama, Zenta Ushiyama, Chang Young Chai, Chang Young Chai, } "Interpolating method with frequency window function for illumination analysis", Proc. SPIE 3780, Optical Design and Analysis Software, (27 September 1999); doi: 10.1117/12.363766; https://doi.org/10.1117/12.363766
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