CHARACTERIZATION OF OPTICAL RETARDANCE OF A GLASS-BASED SAMPLE USING LIGHT-SCATTERING POLARIMETRY

摘要

Methods of characterizing an optical retardance or a stress-related property of a glass-bases sample include directing a light beam (112) into the glass-based sample (10) while varying the polarization of the light beam to generate scattered light (112S) for each polarization. The scattered light for each polarization is captured with an image sensor (114), which has an exposure time and a frame rate. The scattered light has an intensity distribution at the image sensor. The sample is moved so that the image sensor averages two or more different intensity distributions per frame to form an averaged intensity distribution for each polarization. The averaged intensity distributions for multiple frames are then used to characterize the optical retardance. The optical retardance can be used to determine stress-related properties of the glass-based sample. Moving the substrate reduces measurement noise due to scattered light having no optical retardance information.