Patent ID: 8895941

Claim:
A method of determining a compositional depth profile of a plurality of target layers of a laminated glass sheet by executing depth-sensitive fluorescent spectroscopy, wherein at least two of the target layers of the laminated glass sheet have distinct intrinsic UV-induced fluorescence and the method comprises: directing UV radiation through a face of the laminated glass sheet into the target layers of the laminated glass sheet to induce distinct fluorescence in respective target layers of the laminated glass sheet, wherein the respective target layers define glass compositions and relative indices of refraction that permit formation of an externally-viewable fluorescent intensity profile across the target layers of the laminated glass sheet; positioning a fluorescence signal detector or an imaging camera to detect image data representing the externally-viewable fluorescent intensity profile; and operating a fluorescence intensity profile processor to determine a compositional depth profile of the target layers of the laminated glass sheet by generating a depth-sensitive representation of the fluorescent intensity profile across the target layers of the laminated glass sheet; wherein the laminated glass sheet defines a wavelength-dependent absorption window in which between approximately 5% and approximately 85% of the UV radiation is absorbed in the laminated glass sheet, and the UV radiation falls within the wavelength-dependent absorption window.