Abstract
The paper analyses a possibility of determination of axial defocus of lighting point, which is imaged by an optical system without aberrations, from a knowledge of intensity distribution or an amount of light (amount of energy – fractional total energy) detected in a region around a point's image centre. Analytic formulas for calculation of the defocus are derived, and they are verified by numerical examples, simulations and experiment. Outputs show that the method can evaluate the axial depth of the particle up to several micro-metres with accuracy in a range of fraction of percents.
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