Patent ID: 9632020
Date: 2017-04-25
CPC Classifications: G01N

Claim:
1. A method for non-invasively evaluation a substrate material surface comprising the steps of: positioning a first optical source and a second optical source wherein each optical source emits an optical source input signal, with at least one optical source polarization control in communication with each optical source; directing each optical source input signal from each optical source to a respective polarization control; directing each optical source input signal from the respective optical source polarization control to a predetermined area on a substrate comprising a substrate material surface; mixing the optical source input signals at the predetermined area on the substrate material surface to produce a combined output signal; positioning a detector at a predetermined location, said detector in communication with polarization rotator and a polarization controller; directing at least a portion of the output signal from the predetermined area on the substrate material surface to the polarization controller and polarization rotator to null the output signal; and directing at least a portion of the output signal from the polarization rotator to the detector; detecting at least a portion of the output signal that is directed from the predetermined area on the substrate material surface to the detector; and characterizing features of the predetermined area on the substrate material surface at a molecular level based on characteristics of the output signal received by the detector.