Laminated glass sheet depth profile determination

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 non-UV laser radiation from a non-UV laser radiation source through a face of the laminated glass sheet to define a series of multi-photon focal points in the laminated glass sheet and induce fluorescence in respective ones of the plurality of target layers of the laminated glass sheet at a UV excitation frequency that exceeds the frequency of the radiation source, wherein the respective target layers define glass compositions and relative refractive indices that permit formation of externally detectable fluorescence across the target layers of the laminated glass sheet;
• positioning a focusing lens to permit detection of the externally detectable fluorescence across a thickness of the laminated glass sheet;
• and
• operating a data processor to determine a compositional depth profile of the target layers of the laminated glass sheet by generating a depth-sensitive representation of the externally detectable fluorescence across the target layers of the laminated glass sheet;
• wherein the laminated glass sheet defines a wavelength-dependent transmission window in which at least approximately 90% of the non-UV radiation is transmitted through the laminated glass sheet, and the non-UV radiation falls within the wavelength-dependent transmission window.

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 target layers of the laminated glass sheet are selected from cover glass compositions, LCD glass compositions, and photovoltaic glass compositions and comprise components selected from tin oxides, antimony oxides, rare earth elements, lead oxides, iron oxides, zinc oxides, vanadium oxides, arsenic oxides, germanium oxides, other fluorescing active oxides, or combinations thereof.