Patent ID: 8035817
Filing Date: 2011-10-11
Classification: G01J,G01N

Abstract:
1. A method for estimating a reflectance at an arbitrary displacement angle inside an incident plane A and outside the incident plane A, by taking an angle between a regularly reflected light S of an incident light L, which is regularly reflected inside the incident plane A when the incident light L is made incident on an incident point P on a plane under measurement at a predetermined incident angle θ, and a reflected light V of the incident light L, which is reflected and received from the incident point P, as a displacement angle α, the method for estimating a reflectance being characterized in that the method includes a first reflectance measuring step of measuring first reflectances R(α a first locus determining step of by taking bisection vectors between said incident light L a second reflectance measuring step of measuring second reflectances R(α a second locus determining step of, by taking bisection vectors between said incident light L two intersections coordinate determining step of, upon assuming a rectangular coordinate P-xyz existing in a space in which an x axis, a y axis and a z axis cross at right angles and share the incident point P as an origin thereof, and of which an xy plane acts as the plane under measurement and an xz plane inclusive of the incident point P acts as the incident plane A, determining intersections Q a model equation determining step of approximately modeling a locus n (x, y, z an overall locus determining step of approximately determining an overall locus n′ (x, y, z) of said overall termini of a bisection vector H′ between a reflected light V′ other than said first reflected light V said displacement angles α said first reflectance measuring step, said first locus determining step, said second reflectance measuring step, said second locus determining step, said two intersections coordinate determining step, said model equation determining step and said overall locus determining step being repeated for each incident light L