Patent ID: 8456639

Claim:
A spectroscopic instrument for conducting multi-wavelength, multi-azimuth, multi-angle-of-incidence readings on a substrate, comprising: a broadband light source for producing an illumination beam along a composite beam pathway, an objective for directing the illumination beam onto the substrate at multiple azimuth angles and multiple angels-of-incidence simultaneously, thereby producing a reflection beam along the composite bean pathway, an aperture plate having an illumination aperture and a plurality of collection apertures formed therein, for selectively passing first portions of the illumination beam and second portions of the reflection beam having desired discreet combinations of azimuth angle and angle-of-incident, wherein the first portions and the second portions are separate portions of the combined beam pathway, a detector for receiving the discreet combinations of azimuth angle and angle-of-incident and producing readings, and a processor for interpreting the readings.