Multiple‐view Shape and Deformation Measurement by Combining Fringe Projection and Digital Image Correlation

Nguyen, Truong Tho; Huntley, Jonathan M.; Burguete, Richard; Coggrave, C. R.

doi:10.1111/j.1475-1305.2011.00819.x

Cited by 15 publications

(8 citation statements)

References 25 publications

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“…However, due to a sensor's field of view limitation, spatial constraints of the testing facility and optical occlusion effects or complex curvature, large-scale wind turbine blades need to be measured from many different viewing positions or directions as seen in Figure 1. Three different approaches have been suggested to stitch the different fields of view provided by multiple DIC measurements [27]. The first approach fixes the sensors and moves test object on a mechanical stage.…”

Section: Prior Work Related To Spatial Stitchingmentioning

confidence: 99%

Large-area photogrammetry based testing of wind turbine blades

Poozesh

Baqersad

Niezrecki

et al. 2017

Mechanical Systems and Signal Processing

146

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An optically based sensing system that can measure the displacement and strain over essentially the entire area of a utility-scale blade leads to a measurement system that can significantly reduce the time and cost associated with traditional instrumentation. This paper evaluates the performance of conventional three dimensional digital image correlation (3D DIC) and three dimensional point tracking (3DPT) approaches over the surface of wind turbine blades and proposes a multi-camera measurement system using dynamic spatial data stitching. The potential advantages for the proposed approach include: (1) full-field measurement distributed over a very large area, (2) the elimination of timeconsuming wiring and expensive sensors, and (3) the need for large-channel data acquisition systems. There are several challenges associated with extending the capability of a standard 3D DIC system to measure entire surface of utility scale blades to extract distributed strain, deflection, and modal parameters. This paper only tries to address some of the difficulties including: (1) assessing the accuracy of the 3D DIC system to measure full-field distributed strain and displacement over the large area, (2) understanding the geometrical constraints associated with a wind turbine testing facility (e.g. lighting, working distance, and speckle pattern size), (3) evaluating the performance of the dynamic stitching method to combine two different fields of view by extracting modal parameters from aligned point clouds, and (4) determining the feasibility of employing an output-only system identification to estimate modal parameters of a utility scale wind turbine blade from optically measured data. Within the current work, the results of an optical measurement (one stereo-vision system) performed on a large area over a 50-meter utility-scale blade subjected to quasistatic and cyclic loading are presented. The blade certification and testing is typically performed using International Electro-Technical Commission standard (IEC 61400-23). For static tests, the blade is pulled in either flap-wise or edgewise directions to measure deflection or distributed strain at a few limited locations of a large-sized blade. Additionally, the paper explores the error associated with using a multi-camera system (two stereo-vision systems) in measuring 3D displacement and extracting structural dynamic parameters on a mock set up emulating a utility-scale wind turbine blade. The results obtained in this paper reveal that the multi-camera measurement system has the potential to identify the dynamic characteristics of a very large structure.

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Section: Prior Work Related To Spatial Stitchingmentioning

confidence: 99%

Large-area photogrammetry based testing of wind turbine blades

Poozesh

Baqersad

Niezrecki

et al. 2017

Mechanical Systems and Signal Processing

146

View full text Add to dashboard Cite

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“…In fact, an alternative technique to 3D-DIC combining 2D-DIC and FP was investigated by previous researchers [ 31 , 32 , 33 , 34 , 35 , 36 , 37 , 38 ], but they were usually limited to static testing, a specific size of specimens or presented some errors in the measurement. Nonetheless, the authors of this work proposed a new integration methodology to measure large 3D shapes and displacements in solids [ 39 , 40 ].…”

Section: Introductionmentioning

confidence: 99%

RGB Colour Encoding Improvement for Three-Dimensional Shapes and Displacement Measurement Using the Integration of Fringe Projection and Digital Image Correlation

Felipe-Sesé

Molina-Viedma

López‐Alba

et al. 2018

Sensors

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Three-dimensional digital image correlation (3D-DIC) has become the most popular full-field optical technique for measuring 3D shapes and displacements in experimental mechanics. The integration of fringe projection (FP) and two-dimensional digital image correlation (FP + DIC) has been recently established as an intelligent low-cost alternative to 3D-DIC, overcoming the drawbacks of a stereoscopic system. Its experimentation is based on the colour encoding of the characterized fringe and speckle patterns required for FP and DIC implementation, respectively. In the present work, innovations in experimentation using FP + DIC for more accurate results are presented. Specifically, they are based on the improvement of the colour pattern encoding. To achieve this, in this work, a multisensor camera and/or laser structural illumination were employed. Both alternatives are analysed and evaluated. Results show that improvements both in three-dimensional and in-plane displacement are obtained with the proposed alternatives. Nonetheless, multisensor high-speed cameras are uncommon, and laser structural illumination is established as an important improvement when low uncertainty is required for 2D-displacement measurement. Hence, the uncertainty has been demonstrated to be reduced by up to 50% compared with results obtained in previous experimental approaches of FP + DIC.

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“…Beim Einsatz hochaufBrought to you by | New York University Bobst Library Technical Services Authenticated Download Date | 7/14/15 8:46 PM lösender Messgeräte würde jedoch aufgrund der begrenzten volumenbezogenen Auflösung optischer Sensoren das Abtasten der gesamten betreffenden Oberfläche zur vollständigen Durchführung der Inspektionsaufgabe viel Zeit benötigen. Um die Messzeit deutlich zu verkürzen, gab es in den vergangenen Jahren unterschiedliche Ansätze: Im Hinblick auf einzelne, fest definierte Inspektionsaufgaben, die auf groẞen Flächen simultan durchgeführt werden sollen, gibt es die Möglichkeit einen einzelnen Sensor mehrfach parallel zu installieren, so dass die Summe aller Messfelder ein groẞes Messvolumen abdecken [3,9]. In anderen Arbeiten wurde Sensorsysteme entwickelt, die simultan an einem Objekt unterschiedliche Merkmale inspizieren können, wie zum Beispiel die Topologie und das gestreute Farbspektrum des Bauteils [12,14].…”

Section: Introductionunclassified

Multisensorisches Messsystem zur dreidimensionalen Inspektion technischer Oberflächen

Keck

Böhm

Knierim

et al. 2014

Tm - Technisches Messen

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Zusammenfassung Um die Fertigungsqualität mechanischer Bauteile aus Kleinserienproduktionen sicherzustellen werden flexible Inspektionssysteme benötigt. Zur Erfüllung dieser Anforderungen wird in diesem Beitrag eine multiskalige Inspektionsstrategie und deren Implementierung an einem Demonstrator vorgestellt. Dieser besteht aus mehreren optischen Sensoren sowie einem Aktoriksystem, das mithilfe einer angepassten Messablaufsteuerung und Regelung zur Inspektion von Unvollkommenheiten an kleinen Bauteilen wie Zahnrädern eingesetzt werden kann.

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Multiple‐view Shape and Deformation Measurement by Combining Fringe Projection and Digital Image Correlation

Cited by 15 publications

References 25 publications

Large-area photogrammetry based testing of wind turbine blades

Large-area photogrammetry based testing of wind turbine blades

RGB Colour Encoding Improvement for Three-Dimensional Shapes and Displacement Measurement Using the Integration of Fringe Projection and Digital Image Correlation

Multisensorisches Messsystem zur dreidimensionalen Inspektion technischer Oberflächen

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