Abstract
An alternative object positioning technique based on digital moiré is presented. The moiré pattern is obtained by the digital subtraction of different self-images under predetermined conditions including a grating rotation. The principle of the method relies on the fringe visibility matching in the moiré process while moving from one self-image plane to another. The motion produces both loose of fringe contrast and rotation of the moiré fringes. The theoretical model of this matching is provided. It applies the concept of measuring a global maximum contrast to each image, which allows to obtain both the best contrast and the adequate rotation. This allows a precise identification of each Talbot plane associated to an object to be positioned.
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