Abstract: In this work, the phase evaluation of multiple-beamFizeau interferograms is carried out by the usualphase-stepping algorithms by superimposing theinterferogram on a Ronchi grid located at theinterferometer image plane. The phase modulation,required for phase measurement, is obtained bytranslating the grid in its own plane, while a slightdefocusing in the image acquisition system provides asuitable sinusoidal intensity pattern. An estimation ofthe measurable range of surface slopes is calculatedand experiments on a spherical surface have beenrealized in order to analyze the validity of theobtained results.!8
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