A moiré fringe alignment aid |
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| Authors: | GT Reid |
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| Institution: | National Engineering Laboratory, East Killbride, Glasgow G75 oQU, UK |
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| Abstract: | The task of accurately superimposing two photographic transparencies is frequently encountered in some areas of optical metrology. By recording a suitable line structure, along with the image, on each photograph, moiré fringes formed when two of the structures are superimposed can be used to give an accurate indication of the alignment of the transparencies. |
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