Optical difference engine for defect inspection in highly-parallel manufacturing processesTools Feng, Xiaobing, Su, Rong, Liu, Mingyu and Leach, Richard K. (2017) Optical difference engine for defect inspection in highly-parallel manufacturing processes. In: 12th International Conference and Exhibition on Laser Metrology, Coordinate Measuring Machine and Machine Tool Performance, (LAMDAMAP 2017), 15-16 March, 2017, Renishaw Innovation Centre, Wotton-under-Edge , United Kingdom. Full text not available from this repository.AbstractTraditional defect inspection for highly-parallel manufacturing processes requires the processing of large measurement datasets, which is often not fast enough for in-situ inspection of large areas with high resolution. This study develops an all-optical difference engine for fast defect detection in highly-parallel manufacturing processes, where the detection of defects (differences from nominal) is performed optically and in real-time. Identification of defects is achieved through an optical Fourier transform and spatial filtering, detecting differences between two real objects by nulling information that is repeated in each object. The developed prototype device is demonstrated using geometric patterns of similar scale to components in printed electronic circuits
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