A simple and effective method for filtering speckle-interferometric phase fringe patterns

Aebischer, H. A.; Waldner, Stephan

doi:10.1016/s0030-4018(99)00116-9

Cited by 234 publications

(89 citation statements)

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“…Cross-sections of the raw and the filtered phase are also compared. The used filter is the well-known iterative sine cosine filter [23] implemented here with a 5×5 box kernel and iterated 10 times. A 3D view of the filtered phase map is added which reproduces faithfully the topology of the test object.…”

Section: Experimental Results Discussion and Outlooksmentioning

confidence: 99%

Snap-shot profilometry with the Empirical Mode Decomposition and a 3-layer color sensor

2011

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Remote sensing finds more and more applications, from industrial control, to face recognition, not forgetting terrain surveying. This trend is well exemplified by fringe projection techniques, which enjoyed a considerable development in the recent years. In addition of high requirement in terms of measurement accuracy and spatial resolution, the end-users of full-field techniques show a growing interest for dynamic regimes. We report here what we believe to be the use for the first time of a CMOS 3-layer color sensor (Foveon X3) as the key element of a RGB fringe projection system, together with the processing specifically elaborated for this sensor. The 3-layer architecture allows the simultaneous recording of three phase-shifted fringe patterns and features the precious asset of an unambiguous relationship between the physical sensor pixel and the picture pixel and this for each color layer, on the contrary of common color sensor arrays (Bayer mosaic and tri-CCD). Due to the overlapping of the spectral responses of the layers, color transformation is mandatory to achieve the separation of the three phase-shifted RGB projected fringe patterns. In addition, we propose the use of the Empirical Mode Decomposition to equalize the non-uniform responses of the three layers. Although the conversion of the phase into a height is of primary importance in an actual measurement, it is not treated here, the literature being profuse on the central projection model. 6. P. Groot, "Derivation of algorithms for phase-shifting interferometry using the concept of a data-sampling window," Appl. Opt. 34(22), 4723-4730 (1995). 7. D. W. Phillion, "General methods for generating phase-shifting interferometry algorithms," Appl. Opt. 36(31), 8098-8115 (1997). 8. Y. Surrel, "Design of algorithms for phase measurements by the use of phase stepping," Appl. Opt. 35(1), 51-60 (1996). 9. J. Novak, P. Novak, and A. Miks, "Multi-step phase-shifting algorithms insensitive to linear phase shift errors," ©2011 Optical Society of AmericaOpt. Commun. 281(21), 5302-5309 (2008). 10. X. Colonna de Lega, and P. Jacquot, "Deformation measurement with object-induced dynamic phase shifting," Appl. Opt. 35(25), 5115-5121 (1996). 11. C. Wust, and D. W. Capson, "Surface profile measurement using color fringe projection," Mach. Vis. Appl. 4(3), 193-203 (1991 550-558 (2010). 22. S. Equis, and P. Jacquot, "The empirical mode decomposition: a must-have tool in speckle interferometry?" Opt.Express 17(2), 611-623 (2009). 23. H. A. Aebischer, and S. Waldner, "Simple and effective method for filtering speckle interferometric phase fringe patterns," Opt. Commun. 162(4-6), 205-210 (1999).

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Section: Experimental Results Discussion and Outlooksmentioning

confidence: 99%

Snap-shot profilometry with the Empirical Mode Decomposition and a 3-layer color sensor

2011

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“…6. Before unwrapping the phase map, the noise was reduced by filtering with a convolution mask of dimension three applied at the sine/cosine 18,23,24 level. The filtered wrapped phase map is shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

Almost-common path interferometer using the separation of polarization states for digital phase-shifting shearography

et al. 2007

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Abstract. An original experimental setup for shearography with metrological applications is presented. The simplicity and the efficiency of the setup are provided by a shearing device, a prism that separates the TE and TM polarization modes with a coating and a thin glass plate placed on its face. The use of this shearing device enables an in-line and almost-common path configuration for the shearing interferometer, a path that leads to high stability and a low sensitivity to external disturbances. Moreover, the sensitivity of the interferometer can be easily adjusted for different applications by varying the shearing amount with glass plates of different thicknesses or by moving the shearing device between two lenses along the optical axis. The temporal phase-shifting method is applied through the use of a liquid crystal variable retarder.

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“…The Moiré fringes as well as the corresponding Moiré phases in the x and y directions were respectively obtained from the grid images at 0 MPa and 258 MPa. A Sin/Cos filter [21] with a half kernel size of 3 pixels was applied to smooth these Moiré phases. The tortuous Moiré fringes and Moiré phase in the x direction after deformation in Figures 7g and 7i indicate the non-uniform deformations of different layers, where the greater phase change or deformation can be observed in the lower layer interface.…”

Section: Normal Shear and Principal Strain Distributionsmentioning

confidence: 99%

Interlaminar Shear Behavior of Laminated Carbon Fiber Reinforced Plastic from Microscale Strain Distributions Measured by Sampling Moire Technique

Wang¹,

Ri²,

Tsuda³

et al. 2018

Preprint

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Abstract:The interlaminar shear behavior of a [±45°] laminated carbon fiber reinforced plastic (CFRP) specimen was investigated utilizing microscale strain mapping in a wide field of view. A three-point bending device was developed under a laser scanning microscope, and the full-field strain distributions including normal, shear and principal strains of CFRP in a three-point bending test were measured using a developed sampling Moiré technique. The microscale shear strain concentrations at interfaces between each two adjacent layers were successfully detected and found to be positive-negative alternately distributed before damage occurrence. The 45° layers slipped to the right relative to the -45° layers, visualized from the revised Moiré phases and shear strain distributions of the angle-ply CFRP under different loads. The absolute values of the shear strain at interfaces gradually rose with the increase of the bending load, and the sudden decrease of the shear strain peak value implied the occurrence of interlaminar damage. The evolution of the shear strain concentrations is useful in the quantitative evaluation of the potential interlaminar shear failure.

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A simple and effective method for filtering speckle-interferometric phase fringe patterns

Cited by 234 publications

References 1 publication

Snap-shot profilometry with the Empirical Mode Decomposition and a 3-layer color sensor

Snap-shot profilometry with the Empirical Mode Decomposition and a 3-layer color sensor

Almost-common path interferometer using the separation of polarization states for digital phase-shifting shearography

Interlaminar Shear Behavior of Laminated Carbon Fiber Reinforced Plastic from Microscale Strain Distributions Measured by Sampling Moire Technique

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