Patent ID: 9645096
Date: 2017-05-09
CPC Classifications: G01N

Claim:
1. A method for optical measurements, comprising: providing a substrate with a structure for optical measurement on the substrate; illuminating a light spot on the structure for optical measurement to obtain a measured light scattering spectrum; performing a first matching process to obtain a plurality of matching standard optical scattering spectra and a plurality of first matching degrees, each matching standard optical scattering spectrum corresponding to one first matching degree, wherein each first matching degree is a matching error between the measured light scattering spectrum and each matching standard optical scattering spectrum; obtaining a plurality of combined optical scattering spectra based on the plurality of matching standard optical scattering spectra; and performing a second matching process to obtain a plurality second matching degree, each corresponding to one combined optical scattering spectrum, wherein each second matching degree is a matching error between the measured light scattering spectrum and each combined optical scattering spectrum.