High-speed, sub-Nyquist interferometry

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

doi:10.1364/OE.19.010111

High-speed, sub-Nyquist interferometry

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

School of Engineering & Physical Sciences

Research output: Contribution to journal › Article › peer-review

11 Citations (Scopus)

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Abstract

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/t_s, where t_s is the detector frame period. © 2011 Optical Society of America.

Original language	English
Pages (from-to)	10111-10123
Number of pages	13
Journal	Optics Express
Volume	19
Issue number	11
DOIs	https://doi.org/10.1364/OE.19.010111
Publication status	Published - 23 May 2011

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title = "High-speed, sub-Nyquist interferometry",

abstract = "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. {\textcopyright} 2011 Optical Society of America.",

author = "Tao Wu and Valera, {Jesus D.} and Moore, {Andrew J.}",

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doi = "10.1364/OE.19.010111",

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T1 - High-speed, sub-Nyquist interferometry

AU - Wu, Tao

AU - Valera, Jesus D.

AU - Moore, Andrew J.

PY - 2011/5/23

Y1 - 2011/5/23

N2 - 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.

AB - 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.

U2 - 10.1364/OE.19.010111

DO - 10.1364/OE.19.010111

M3 - Article

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VL - 19

SP - 10111

EP - 10123

JO - Optics Express

JF - Optics Express

IS - 11

ER -

High-speed, sub-Nyquist interferometry

Abstract

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