Digital speckle pattern interferometry (DSPI) with increased sensitivity: Use of spatial phase shifting

Bhaduri, Basanta; Kothiyal, M. P.; Mohan, N. Krishna

doi:10.1016/j.optcom.2006.11.012

Cited by 10 publications

(3 citation statements)

References 11 publications

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“…16 LetL ¼ uî þ vĵ þ wk be the displacement vector at an arbitrary point on the object surface, where u, v, k are the components of displacement along x, y, z directions, respectively. 16 LetL ¼ uî þ vĵ þ wk be the displacement vector at an arbitrary point on the object surface, where u, v, k are the components of displacement along x, y, z directions, respectively.…”

Section: Optical Setupmentioning

confidence: 99%

“…And this makes TPS inherently unsuitable for some cases where simultaneous events are investigated or where the mechanical vibration is nonignorable due to the requirement of multiple interferograms. The double-aperture mask SPS arrangements [14][15][16] are similar to the Michelson stellar interferometer that consists of two apertures against the imaging lens. 9 This method needs to calculate the mean intensity, modulation amplitude, and phase under initial status of object.…”

Section: Introductionmentioning

confidence: 99%

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Single-aperture spatial phase-shifting technique for speckle shearography based on modified Michelson interferometer

Zhu

Zhang

et al. 2013

Opt. Eng

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A modified Michelson interferometer for spatial phase shifting speckle shearography is presented. The interferometer consists of one slit aperture, one beam splitter, and two spherical mirrors. Spatial carrier frequency and shear are both generated by one translated spherical mirror. The slit aperture controls the speckle size. These arrangements make the system simple and easy to align. The shear is proportional to the translation of the spherical mirror. Shear distortion due to the rotated mirror in a traditional Michelson interferometer is avoided as well. The carrier frequency is proven to be constant in image plane and can be conveniently adjusted by translating the spherical mirror without changing imaging setup. Fourier analysis method is applied to accurately calibrate carrier frequency. Finally, experimental dynamic deformation results of a center loaded metal plate using the proposed method are provided.

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Section: Optical Setupmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Single-aperture spatial phase-shifting technique for speckle shearography based on modified Michelson interferometer

Zhu

Zhang

et al. 2013

Opt. Eng

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show abstract

“…1,2 It is well known that quantitative extraction phase distribution is of vital importance because it is directly related with a physical quantity, such as displacement, strain or curvature, and so on. As a result, digital image processing procedure can be used for the quantitative analysis of DSPI fringe pattern.…”

Section: Introductionmentioning

confidence: 99%

Denoising in digital speckle pattern interferometry using fast discrete curvelet transform

Wang

2013

The Imaging Science Journal

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In digital speckle pattern interferometry, the denoising of speckle fringe patterns is of vital importance for quantitative extraction of phase distribution. A filtering method of fast discrete curvelet transform based on weighted average thresholding technique is proposed in this paper for noise removal in speckle fringe patterns. Both computer-simulated and experimental digital speckle pattern interferometry fringe patterns are adopted to evaluate the performance of the proposed filtering method. In addition, a widely used and representative filtering method, windowed Fourier filter, is introduced for making a comparison and validation in the image processing effect, and the parameter of peak signal noise ratio is also used for assessment of denoising effect. It is shown from the filtered results that the filtering method of fast discrete curvelet transform is effecitve to remove speckle noises and simultaneously preserve fringe structure information.

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Real-time dual-channel speckle interferometry based on an improved dual-observation configuration with spatial phase-shifting

Pan

Qiu

et al. 2021

Measurement

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Digital speckle pattern interferometry (DSPI) with increased sensitivity: Use of spatial phase shifting

Cited by 10 publications

References 11 publications

Single-aperture spatial phase-shifting technique for speckle shearography based on modified Michelson interferometer

Single-aperture spatial phase-shifting technique for speckle shearography based on modified Michelson interferometer

Denoising in digital speckle pattern interferometry using fast discrete curvelet transform

Real-time dual-channel speckle interferometry based on an improved dual-observation configuration with spatial phase-shifting

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