An Approaching to the Problem of Reconstruction of Phase of Interferometric Images

Many electronic instruments as computer chips, video recorders, optical instruments lens need a perfect finish. If the surfaces are too rough, the performance of such instruments can be very faulty; so that the finishing of such pieces needs the measuring of the surface texture. Toward 1980 it is relied on some methods of surface analysis, among them there is the interferometric technique, which uses the light ondulatory nature in order to produce a precise measurement of shapes and distances, that is to say, the topography of the surface. An advantage of the interferometric technique is that it doesn ́t requires a physical contact with the piece of study. The mechanical methods of measurement fundamentally consist on a feeler or mechanic perfilometer provided with a diamond top wich lightly enters in contact with the surface and is slided through it, arising an output voltage proportional to the surface height in every contact point.