High-speed, sub-Nyquist interferometry

Tao Wu, Jesus D. Valera, Andrew J. Moore

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)
56 Downloads (Pure)


The velocity measurement limit in dynamic interferometry is ?Nyq, the velocity at which the interferogram is sampled at the Nyquist limit. We show that ?Nyq can be exceeded by assuming continuity of the surface motion and unwrapping the velocity modulo 2?Nyq. The technique was demonstrated in a high-speed speckle pattern interferometer with spatial phase stepping. Surface velocities of 4?Nyq were measured experimentally. With a reduced exposure, high-speed sub-Nyquist interferometry could be implemented up to a maximum acceleration of ?Nyq/ts, where ts is the detector frame period. © 2011 Optical Society of America.

Original languageEnglish
Pages (from-to)10111-10123
Number of pages13
JournalOptics Express
Issue number11
Publication statusPublished - 23 May 2011


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