Patent ID: 8059282

Claim:
A reflective film thickness measurement method, comprising: obtaining a broadband reflectance wavelength function M(Î») by passing broadband light, emitted by a broadband light source, through a thin film in a measurement system; transforming, by the measurement system, the broadband reflectance wavelength function M(Î») into a broadband frequency-domain function M(f); dividing, by the measurement system, the broadband frequency-domain function M(f) by a single-wavelength frequency-domain function h(f), so as to obtain an ideal frequency-domain function S(f); inverse-transforming, by the measurement system, the ideal frequency-domain function S(f) into an ideal reflectance wavelength function S(Î»); and performing, by the measurement system, a curve fitting on the ideal reflectance wavelength function S(Î») and a reflectance wavelength thickness general expression, so as to obtain a thickness of the thin film.