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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 44, Iss. 14 — May. 10, 2005
  • pp: 2772–2781

Adaptive correction to the speckle correlation fringes by using a twisted-nematic liquid-crystal display

Erwin Hack, Phanindra Narayan Gundu, and Pramod Rastogi  »View Author Affiliations


Applied Optics, Vol. 44, Issue 14, pp. 2772-2781 (2005)
http://dx.doi.org/10.1364/AO.44.002772


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Abstract

An innovative technique for reducing speckle noise and improving the intensity profile of the speckle correlation fringes is presented. The method is based on reducing the range of the modulation intensity values of the speckle interference pattern. After the fringe pattern is corrected adaptively at each pixel, a simple morphological filtering of the fringes is sufficient to obtain smoothed fringes. The concept is presented both analytically and by simulation by using computer-generated speckle patterns. The experimental verification is performed by using an amplitude-only spatial light modulator (SLM) in a conventional electronic speckle pattern interferometry setup. The optical arrangement for tuning a commercially available LCD array for amplitude-only behavior is described. The method of feedback to the LCD SLM to modulate the intensity of the reference beam in order to reduce the modulation intensity values is explained, and the resulting fringe pattern and increase in the signal-to-noise ratio are discussed.

© 2005 Optical Society of America

OCIS Codes
(050.5080) Diffraction and gratings : Phase shift
(100.2650) Image processing : Fringe analysis
(120.6150) Instrumentation, measurement, and metrology : Speckle imaging
(120.6160) Instrumentation, measurement, and metrology : Speckle interferometry
(230.3720) Optical devices : Liquid-crystal devices

History
Original Manuscript: January 26, 2004
Revised Manuscript: July 9, 2004
Manuscript Accepted: November 9, 2004
Published: May 10, 2005

Citation
Erwin Hack, Phanindra Narayan Gundu, and Pramod Rastogi, "Adaptive correction to the speckle correlation fringes by using a twisted-nematic liquid-crystal display," Appl. Opt. 44, 2772-2781 (2005)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-44-14-2772

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