Method and apparatus for determining refractive index distribution.

摘要

Determination of refractive index distribution is utilized, data of all the positions of diffraction images on a plane, from the incident ray dispersed by the cylindrical glass rod during the ray passing therethrough, are performed linear approximation thereof; and the angle of the outgoing ray is calculated using the intersection of the approximate lineation and a plane through which the incident ray passes. Many data can be employed to calculated the angle of the outgoing ray. This substantially improve accuracy of measurement of the angle of the outgoing ray and further this makes it possible to determine the angle even if no image of the outgoing ray is present on the plane through which the incident ray passes.