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Optics Letters

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  • Editor: Anthony J. Campillo
  • Vol. 31, Iss. 16 — Aug. 15, 2006
  • pp: 2420–2422

Amplitude and phase analysis in digital dynamic holography

Anand Asundi and Vijay Raj Singh  »View Author Affiliations


Optics Letters, Vol. 31, Issue 16, pp. 2420-2422 (2006)
http://dx.doi.org/10.1364/OL.31.002420


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Abstract

Lensless in-line digital holographic interferometry has the potential for vibration analysis of objects smaller than 5 mm in diameter. This is particularly useful for dynamic characterization of microelectromechanical systems devices. To achieve this, there is a need to magnify the object wave, which is done using a diverging beam. It is observed that an increase in the object-to-CCD distance increases the sensitivity of the amplitude-modulated time-average fringes. At the same time the effect on phase information that represents the mean static deformation of a vibrating object is studied. It is also observed that a reduction in the object-to-CCD distance increases the phase sensitivity as evidenced by the double-exposure time-average fringes. The experimental observation and a theoretical explanation for this contradictory phenomenon are presented.

© 2006 Optical Society of America

OCIS Codes
(090.0090) Holography : Holography
(090.1760) Holography : Computer holography
(090.2880) Holography : Holographic interferometry
(120.0120) Instrumentation, measurement, and metrology : Instrumentation, measurement, and metrology

ToC Category:
Holography

History
Original Manuscript: March 1, 2006
Revised Manuscript: March 14, 2006
Manuscript Accepted: June 11, 2006
Published: July 25, 2006

Citation
Anand Asundi and Vijay Raj Singh, "Amplitude and phase analysis in digital dynamic holography," Opt. Lett. 31, 2420-2422 (2006)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-31-16-2420


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