Abstract
an analysis based on the modulation-transfer function (MTF) is made of the photo-optical systems used to produce and record moire fringe patterns. The low-pass filtering capabilities of a real lens and film are demonstrated. The influence of this filtering action on the largest strain that can be measured for a given amount of initial mismatch is discussed. Simple techniques of optical low-pass filtering are presented that increase the quality of moire patterns that are to be processed automatically.
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