Fast detection of single-sided diffracted defects in display glass

A fast non-interferometric system for measurement of diffraction patterns based on the incidence of partially coherent light in display glass is assembled. The system operates both in transmission and in reflection modes in an environment that is prone to vibrations and misalignments. Asymmetric defects are measured and compared to a white-light interferometer. The system provides an acceptable qualitative measurement for an on-site detection of asymmetric defects leading to a better understanding of this class of imperfections.