Dorrío B V, Doval A F, López C, Soto R, Blanco-García J, Fernández J L, Pérez-Amor M
Appl Opt. 1995 Jul 1;34(19):3639-43. doi: 10.1364/AO.34.003639.
The automation of the fringe pattern analysis in Fizeau interferometry combining the moiré effect with the phase-stepping evaluation method is presented. In this case the phase modulator is a Ronchi grid placed at the interferometer image plane yielding a moiré image, and the necessary phase steps are obtained, simply translating the grid in its own plane, perpendicular to the optical axis. A detailed description of the moiré image formation as an incoherent superposition is developed. Measurements were carried out in a Fizeau interferometer built by the authors, and rms repeatabilities of less than 3 deg in the phase-difference values were attained.
