Method of measuring
distribution function of a spot in the plane of the best image of lens is
considered. The aim of research is to reduce measuring time of lens
distribution function and simplify processing measuring results for
automatically control using. In the considered method, the slit or light –
shadow boundary of spread function is scanned with possibility of conversion to
contrast frequency characteristic. Numerical evaluation is made through
equivalent diameter of circle in spot distribution. Method of calculation of
equivalent diameter is developed. An automatic installation for measuring
equivalent diameter in different planes near focal plane of lens is described.
Scheme and design of installation with led and laser illuminators are
considered. The results of study of dependence of scattering circle diameter on
parameters of beam illuminating lens are presented. Processing of measurement
results is carried out in standard program Excel.
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