Patent ID: 8582124
Filing Date: 2013-11-12
Classification: G01B,G01N

Abstract:
1. An optical characteristic measuring apparatus, comprising: a light source irradiating an object to be measured, which has at least one layer of film formed on a substrate, with measuring light having a prescribed wavelength range; a spectrometric measuring unit obtaining a wavelength distribution characteristic of reflection intensity or transmission intensity based on light reflected from said object to be measured or light that has passed through said object to be measured; a modeling unit obtaining a plurality of said wavelength distribution characteristics from said film of a same material, and generating a plurality of film model equations including at least a parameter calculated from each of said obtained wavelength distribution characteristics as well as a film thickness and optical constants of said film; an analyzing unit solving said plurality of film model equations generated by said modeling unit, and performing prescribed calculation on the assumption that said optical constants included in said plurality of film model equations is identical, and obtaining said film thickness and said optical constants of said film; and a fitting unit performing fitting between a waveform obtained by substituting said film thickness and said optical constants of said film obtained by said analyzing unit into said film model equations and a waveform of said wavelength distribution characteristic obtained by said spectrometric measuring unit, thereby determining that said optical constants included in said plurality of film model equations is identical and that said film thickness and said optical constants of said film obtained by said analyzing unit are correct values.