The moire effect is the name given to the fringe patterns observed when two regular patterns, usually linear gratings, are placed in contact, and almost in alignment (Fig. 1). The effect is commonly observed in everyday objects such as loosely woven cloth (the name originates from ‘moire silk’), pairs of railings, television, etc.

Applications of the Moiré Effect

A parallax corrected grating system, consisting of two coarse plane gratings close together, enables relative displacements of 0?0005 in to be observed visually by use of the moir? effect, in ambient light conditions.

A Luxmoore

Papers

Anti-parallax device for observation of moiré fringes