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Amplitude and phase analysis in digital dynamic holography

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Amplitude and phase analysis in digital dynamic holography

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Title: Amplitude and phase analysis in digital dynamic holography
Author: Anand, Asundi; Singh, Vijay Raj
Copyright year: 2006
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.
Subject: DRNTU::Science::Physics::Optics and light.
Type: Journal Article
Series/ Journal Title: Optics letters
School: School of Mechanical and Aerospace Engineering
Version: Accepted version

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