CPC G01M 11/0228 (2013.01) [G01M 11/30 (2013.01)] | 14 Claims |
1. A method for determining a radial refractive index profile of an object, the method comprising:
(a) providing the object, the object including a cylindrical optical object which has a cylinder longitudinal axis around which at least one layer k with a layer radius rk and with a layer refractive index nk extends radially symmetrically wherein the at least one layer is not step-index nor substantially step-index;
(b) measuring the deflection function of the object and transforming the measured data into a measured refractive index profile;
(c) assuming a refractive index level and radius for the layer of the object being evaluated and calculating a compensation level refractive index profile;
(d) generating a theoretical deflection function corresponding to the assumed refractive index level and radius and transforming the generated data into a fitting refractive index profile;
(e) comparing the fitting refractive index profile to the measured refractive index profile and evaluating the comparison against a predetermined accuracy level for the layer of the object being evaluated;
(f) repeating steps (c) and (d) iteratively until the predetermined accuracy level has been achieved;
(g) determining whether the object has another layer to evaluate and compensate;
(h) repeating steps (c) through (f) for each layer of the object until no further layers of the object remain to be evaluated and compensated; and
(i) calculating a measurement artifact compensated refractive index profile for the object by adding the measured refractive index profile to the compensation level refractive index profile and subtracting the fitting refractive index profile.
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