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Experimental Stress Analysis by U. C. Jindal

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11

Moire Fringes Technique

11.1 INTRODUCTION

Moire is a French word and its meaning is watered silk, which is a common optical phenomenon being observed daily if a fold of silk or any other finely woven fabric is allowed to slip on another fold and viewed against a light background simmering zig-zag patterns, localized between two folds of fabric. Such patterns are also seen in mismatched window blinds or superimposed fine wire meshes. In other words, whenever a geometric figure repeating itself regularly such as a set of straight lines, dots, meshes, etc. is superimposed on another similar but not of identical pattern, moire fringes are visible.

Initially moire fringe effect was a problem and needed to be eliminated because these fringes were ...

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