Color-coded methodology for deformable mirrors

The paper describes an experimental procedure for the reconstruction of the geometrical parameters of a reflecting surface. The method is based on the projection of a luminous pattern constituted by coloured points. The successive chromatic selection reduces the complexity of the acquired image. The study evidence that the colours of the points composing the pattern are modified by the combined effect of the CCD camera and of the projection system. In some situations the chromatic components of the pattern points can generate ambiguity. Consequently, the number of colours to be projected and their chromatic separation should be studied in order to allow the simultaneous projection of an elevated number of points and colours.