Patent ID: 9109879
Filing Date: 2015-08-18
Classification: G01B,G02B

Abstract:
1. A method of characterizing a thickness profile of a laminated glass structure having a first surface, a body comprising multiple layers and at least one gradual transition region between adjacent layers, the method comprising: focusing laser light of a first wavelength within the body of the laminated glass structure through the first surface at a surface location and sequentially at different focuses at different distances along a line into the body to cause an emission of fluorescent light of a second wavelength from respective micro-volumes within the body, wherein the second wavelength is shorter than the first wavelength and each micro-volume has a volume in the range from 10 femtoliters to 3,500 femtoliters; detecting an intensity of the fluorescent light for each of the micro-volumes; and determining relative locations of the multiple layers and the at least one gradual transition region based on a variation in the intensities of the detected fluorescent light as a function of the focus distances.