Out-of-plane displacement measurement by electronic speckle pattern interferometry in presence of large in-plane displacement

Martı́nez-Celorio, R.A.; Barrientos, Bernardino; Sanchez-Marı́n, Francisco J; López, Luis Martı́; Rayas, J. A.

doi:10.1016/s0030-4018(02)01556-0

Cited by 10 publications

(3 citation statements)

References 13 publications

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“…(9) and (10)] and we kept a zone of 608 × 480 pixels (corresponding to a typical observed size of 28 × 21 mm 2 ), which is then decomposed into 19 × 15 subimages of 32 × 32 pixels for performing the cross correlation between I av ðx; yÞ and I 0 av ðx; yÞ. We performed the computation of I av ðx; yÞ and I 0 av ðx; yÞ [Eqs.…”

Section: Methodsmentioning

confidence: 99%

“…Then a set of three phase-shifted interferograms is obtained by calculating the spatial average of the specklegrams taken between the two instants and which are digitally shifted from one another by one pixel. SPS is also used by Martínez-Celorio et al 9 to measure out-of-plane displacement in the presence of large in-plane displacement. 7 As we see, the processing is quite complex and, in addition, SPS has the limitation that speckle grains must have a lateral extension of at least 3 pixels in the direction perpendicular to the carrier fringes, which requires the use of a slit instead of a circular aperture in the imaging system.…”

Section: Introductionmentioning

confidence: 99%

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Use of specklegrams background terms for speckle photography combined with phase-shifting electronic speckle pattern interferometry

et al. 2015

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Downloaded From: http://opticalengineering.spiedigitallibrary.org/ on 08/23/2015 Terms of Use: http://spiedigitallibrary.org/ss/TermsOfUse.aspxAbstract. Electronic speckle pattern interferometry (ESPI) is combined with digital speckle photography (DSP) to measure out-of-plane deformation in the presence of large in-plane translation or rotation. ESPI is used to measure out-of-plane displacements smaller than the speckle diameter. In-plane displacements larger than the speckle size are obtained by DSP using artifacts images computed from the phase-stepped specklegrams. Previous works use the specklegram modulation for that purpose, but we show that this can lead to errors in the case of low modulation. In order to avoid this, a simple averaging of phase-stepped specklegrams allows obtaining the average irradiance, which contains information on the speckled object image. The latter can be used more efficiently than the modulation in DSP and is simpler to compute. We also perform a numerical simulation of specklegrams, which show that the use of background terms is much more stable against some error sources as compared to modulation. We show experimental evidence of this in various experiments combining out-of-plane ESPI measurements with in-plane translations or rotations obtained by our DSP method. The latter has been used efficiently to restore phase loss in out-of-plane ESPI measurements due to large in-plane displacements.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Use of specklegrams background terms for speckle photography combined with phase-shifting electronic speckle pattern interferometry

et al. 2015

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“…A first idea consists in combining the speckle interferometry and the so-called "speckle photography" technique [7]. This latter is an image correlation technique.…”

Section: Introductionmentioning

confidence: 99%

A Signal to Noise Optimization Algorithm for Speckle Interferometry Applications

Molimard

Cordero

Vautrin

2008

AMM

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Abstract. Optical Full Field Techniques (OFFT) are more and more utilized by mechanical laboratories. Among these methods, interferometry techniques (mainly composed of Speckle/Grating Interferometry or Speckle/Grating Shearography) are more difficult to use in a mechanical lab context, because of their sensitivity to external vibrations (except shearography), and because of the global lack of optical culture of mechanical engineers. Speckle-based methods are of great practical interest for the users, but their signal to noise ratio (SNR) is affected by the rigid body motion of the specimen. Here, the speckle decorrelation is minimized at local scale directly using the SNR. First, a shearography experiment is modeled to characterize the recorrelation procedure for a rigid body motion, a constant strain map and finally a high degree of localization. The mean noise level is found to be 6 times higher than a fully-correlated phase map for a 1 pixel speckle size. Last, a first application to a single-ply fabric composite lamina is shown. Resulting strain maps are of high quality with a very low spatial resolution (4 pixels). The local bending / global tension coupling effect is clearly put in evidence.

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Out-of-plane deformation measurements of an aluminium plate during quasi-static perforation using structured light and close-range photogrammetry

Grytten

Fagerholt

Auestad

et al. 2007

International Journal of Solids and Structures

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An optical system using structured light and close-range photogrammetry for full-field continuous measurements of the out-of-plane deformation of a metal plate loaded at its centre by a moving punch is presented. The system is applicable both for quasi-static and dynamic loading conditions, but in this paper focus will be on the former. In the tests, a square AA5083-H116 aluminium plate is mounted in a circular frame and penetrated from above by a cylindrical punch, while the out-of-plane deformation is observed from below. A fringe pattern is projected on the target plate surface and recorded by a camera (or more than one if required). The changing fringe positions on the plate surface during perforation are then computer processed to give topography information of the out-of-plane deformation. This paper is divided into three major parts. First, the optical technique is presented with a description of the applied method, image analysis procedures, calibration of the system and estimation of accuracy of the acquired data points. The experimental set-up is then presented, and some results from a typical test where a 5 mm thick plate with free-span diameter of 500 mm is perforated by a 20 mm diameter blunt-nose punch are given. Finally, numerical simulations of the perforation process are carried out using the non-linear finite element code LS-DYNA. The numerical predictions are compared with the experimental observations and the applicability of the experimental method is discussed based on the obtained results.

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Out-of-plane displacement measurement by electronic speckle pattern interferometry in presence of large in-plane displacement

Cited by 10 publications

References 13 publications

Use of specklegrams background terms for speckle photography combined with phase-shifting electronic speckle pattern interferometry

Use of specklegrams background terms for speckle photography combined with phase-shifting electronic speckle pattern interferometry

A Signal to Noise Optimization Algorithm for Speckle Interferometry Applications

Out-of-plane deformation measurements of an aluminium plate during quasi-static perforation using structured light and close-range photogrammetry

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