Patent ID: 7209230

Claim:
A spectra-reflectometer for measuring the spectral characteristics of an object surface, comprising: (a) a light source for generating an input signal comprising a plurality of wavelengths of energy; (b) a diffraction grating for diffracting said input signal into a plurality of diffracted wavelengths of energy; (c) an optical stop positioned between said diffraction grating and said object surface for selectively passing a select wavelength of energy from among said plurality of diffracted wavelengths of energy to said object surface to generate a corresponding reflected wavelength of energy: (d) a resonant mirror assembly associated with said diffraction grating for moving said diffraction grating to sequentially direct said plurality of diffracted wavelengths of energy to said optical stop; (e) a sensor for determining each select diffracted wavelength of energy directed to said object surface; (f) a detector for detecting one or more of said reflected wavelengths, said detector being coupled with said sensor for associating each said select diffracted wavelength with each said corresponding reflected wavelength and (g) said resonant mirror assembly being capable of directing said reflected wavelength of energy to said detector.