Pixelated phase-mask dynamic interferometer

James E. Millerd, Neal J. Brock, John B. Hayes, Michael B. North-Morris, Matt Novak, James C. Wyant, Katherine Creath, Joanna Schmit
2004 Interferometry XII: Techniques and Analysis  
We demonstrate a new type of spatial phase-shifting, dynamic interferometer that can acquire phase-shifted interferograms in a single camera frame. The interferometer is constructed with a pixelated phase-mask aligned to a detector array. The phase-mask encodes a high-frequency spatial interference pattern on two collinear and orthogonally polarized reference and test beams. The phase-difference between the two beams can be calculated using conventional N-bucket algorithms or by spatial
more » ... by spatial convolution. The wide spectral response of the mask and true commonpath design permits operation with a wide variety of interferometer front ends, and with virtually any light source including white-light.
doi:10.1117/12.560807 fatcat:qkex5unt3jfwneg3iiibvpovjy