Noise robust phase unwrapping with a virtual pyramid
Now, it is possible to effectively unwrap phase with noisy and low-signal interferometric measurements with the new method of phase unwrapping called the virtual pyramid wavefront sensor. This was demonstrated while reconstructing wavefronts from interferograms obtained in a digital (SLM-based) phase-shifting point diffraction interferometer. In comparison with existing methods, this new phase unwrapping method was found to be robust to random noise. We believe that this method can be applied to several metrology applications in ophthalmology, magnetic elastography and astronomy.
Full Citation: Vyas Akondi, Brian Vohnsen, and Susana Marcos, “Virtual pyramid wavefront sensor for phase unwrapping,” Applied Optics 55(29), 8363-8367 (2016).