Prof. Analucia Vieira Fantin Profile

Prof. Analucia Vieira Fantin

at Univ Federal de Santa Catarina

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Author

Publications (22)

Proceedings Article | 21 August 2020 Presentation + Paper

Underwater shearography – considerations and first results

T. Figueredo, E. Vieira, M. Benedet, A. Fantin, D. Willemann, F. Broetto, C. Schimitz, A. Albertazzi

Proceedings Volume 11490, 114900S (2020) https://doi.org/10.1117/12.2569388

KEYWORDS: Shearography, Water, Composites, Fringe analysis, Nondestructive evaluation, Optical interferometry, Underwater imaging

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Proceedings Article | 21 June 2019 Paper

A robust integration algorithm for out-of-plane displacement field measurements applied to multiple images of shearography

Estiven Barrera, Analucia Fantin, Daniel Willemann, Mauro Benedet, Armando Albertazzi

Proceedings Volume 11056, 110560H (2019) https://doi.org/10.1117/12.2526103

KEYWORDS: Shearography, Interferometry, Reconstruction algorithms, Phase measurement, Algorithm development, Nondestructive evaluation, Computer simulations, Image processing

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Proceedings Article | 21 June 2019 Presentation + Paper

Diameter quantification of through holes in pipelines hidden by protective layers of composite materials using instantaneous shearography simultaneously in three shearing directions

Tiago Bortoli, Analucia Fantin, Estiven Barrera, Mauro Benedet, Daniel Willemann, Armando Albertazzi

Proceedings Volume 11056, 1105621 (2019) https://doi.org/10.1117/12.2527165

KEYWORDS: Composites, Shearography, Nondestructive evaluation, Data modeling, Corrosion, Finite element methods, Inspection

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Pipelines usually transport hydrocarbons in the oil and gas industry. Small amounts of salt water may be present, which can cause corrosion from the inside to outside. Severe corrosion may produce through holes in the pipe wall. External protective layers of fiber reinforced plastics has been applied to postpone the need to stop production to perform a definitive repair, but do not stop the internal corrosion. It is very important to monitor the dimensions of through holes hidden by the protective layers of composite materials, which cannot exceed critical size and compromise pipe safety. Classical methods, such as ultrasound, do not give very reliable answers when composite materials and steel are combined. There is a great demand for a reliable and practical in field non-destructive inspection method. This work brings a hybrid and reliable solution, which combines a new configuration of a portable one-shot shearography system with finite element methods, resulting in a portable and easy to apply solution. The paper describes the principle of the portable one-shot shearography system that is able of simultaneously measuring in three shearing directions[1]. Considerations and modeling of finite element to determine the response of the composite material to the variation of the internal pressure of the duct are discussed. The report details how the experimental data and numerical model results are combined through an iterative process to determine the diameter of the hidden hole. Instead of integrating the experimental results of shearography, the authors differentiate the results of finite element in the same directions as the one-shot shearography system does simultaneously. The minimum of the square error results in an estimation of the hidden hole diameter. Experiments were performed with 150 mm diameter tubes with 20 to 50 mm diameter holes hidden by 6 to 24 mm thick glass fiber reinforced plastic protective layers. Smaller thickness and bigger diameters led to better results. Mean deviations of the order of 10% were found for the whole set of tests. Although the authors consider it is possible to improve the results, deviations of the order of up to 10% are very acceptable results and represent a significant improvement over the classic methods used today. The robustness of the optical system, the ease of use of the algorithm and the level of uncertainty already achieved make the authors believe that the techniques developed here achieve the requirements and will be very useful for the oil and gas industry demands.

Proceedings Article | 7 September 2018 Paper

A single shot shearography device for simultaneous measurement in three shearing directions

E. Barrera, A. Fantin, M. Benedet, D. Willemann, A. Albertazzi

Proceedings Volume 10834, 108340U (2018) https://doi.org/10.1117/12.2318706

KEYWORDS: Shearography, Speckle pattern, Speckle, Phase measurement, Fourier transforms, Fringe analysis, Phase shifts

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Shearography is a quite robust optical measurement technique frequently used for in-field testing. Defect inspections with shearography on fiber-reinforced plastics parts, widely used in aircrafts, ships, chemical and oil and gas industries, are often performed outside of the lab. However, environmental disturbances can make this task difficult or even impossible. Mechanical vibrations, air and thermal instabilities are among the most disturbing agents in harsh environments that can destroy the interference signal or, at least, dramatically reduce the interference signal quality, what raises the measurement uncertainty to unacceptable levels. For a successful testing, it is crucial to neutralize the influence of those agents. Compactness, high stiffness, robust mechanical design and an effective clamping system are very important design considerations to minimize the influence of those agents. However, the most effective solution is using a single-shot measurement technique; namely, acquiring a single image instead of a series of images. The exposure time is kept short enough to “freeze” any relative motion between the parts or drift of the measurement signal. This paper presents, describes and explores two configurations of multiple aperture single-shot shearography used by the authors for testing fiber-reinforced plastics used in the oil and gas industry outside the lab. The first one is a two-aperture setup variation based in an already existing configuration that produces carrier fringes on the speckle pattern and allows fringe processing in the 2D Fourier plane. The second one is a new three-aperture configuration that allows acquiring three fringe patterns simultaneously form three different shearing directions for each given loading state. A set of three wedges are used in combination with the three apertures to produce simultaneous shearing interferograms in three different orientations. One single shot image is acquired using a single high-resolution camera before a loading is applied to the specimen and another single shot image for each different loading levels. Since the resulting fringe patterns have carrier fringes in different orientations they are easily separated in the Fourier plane. Once the device has no movable parts and a single shot image is acquired, it is very compact, robust and can be successfully used outside of the optical bench. The paper presents applications of both devices. They have a great potential to expand the use of shearography for testing in harsh environments.

Proceedings Article | 24 May 2018 Paper

Speckle Interferometry in harsh environments: design considerations and successful examples

A. Albertazzi, M. Viotti, F. Silva, C. Veiga, E. S. Barrera, M. Benedet, A. Fantin, D. Willemann

Proceedings Volume 10678, 1067802 (2018) https://doi.org/10.1117/12.2317941

KEYWORDS: General applications engineering, Interferometers, Speckle, Speckle interferometry, Shearography, Speckle pattern, Optical components, Diffraction

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Mechanical vibrations, air and thermal instabilities are among the most disturbing agents that make difficult or impossible a successful speckle interferometry measurement in harsh environments. Usually, they destroy the interference signal or, at least, dramatically reduce the interference signal quality, what raises the measurement uncertainty to unacceptable levels. Understanding the effects of disturbing agents on speckle interferometry is a first step towards finding strategies to perform effective measurements in harsh environments. There are three main strategies to successfully measure under unfavorable conditions: isolation, robustness and both. By isolation, we mean ways to avoid the action of the disturbing agents on the speckle interferometer and on the measurand. By robustness, we mean using a robust mechanical design, a robust optical technique, a robust data reduction algorithm and/or a robust configuration that is not much disturbed by mechanical, thermal or air instabilities. Compactness, high stiffness, robust mechanical design and an effective clamping system are very important considerations to minimize the influence of mechanical vibrations. One-shot measurement and averaging are also robust strategies to minimize the negative effects of mechanical vibrations as well as air and thermal instabilities. Protective enclosures are useful solutions for reducing air instabilities effects, but sometimes ineffective for achieving thermal stability outside the lab. Robust optical techniques are perhaps the most effective way to reduce the effects of thermal dilatation. The paper describes these concepts and discusses four speckle interferometry systems developed and successfully used by the authors in harsh environments: An achromatic speckle interferometer, using a diffractive optical element, was developed and has been applied to in-situ measure of residual stresses in pipelines. The second and third systems are compact and attachable shearography systems for in-field testing of the adhesion of joints of composite material pipes. Finally, the fourth system is a configuration of a shearography system using two apertures to produce carrier fringes for the measurement from a single image for each loading stage.

Proceedings Article | 24 August 2017 Presentation + Paper

Robust shearography system for inspection of defects in composite material using diffractive optics

Fabio A. da Silva, Daniel Willemann, Analucia Fantin, Mauro Benedet, Sérgio Soares, Armando Albertazzi

Proceedings Volume 10376, 103760O (2017) https://doi.org/10.1117/12.2274138

KEYWORDS: Diffractive optical elements, Shearography, Composites, Defect inspection, Inspection, Optical inspection, Interferometers

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Proceedings Article | 26 June 2017 Paper

An endoscopic shearography system with radial sensitivity for inner inspection of adhesion faults in composite material pipes

M. Benedet, F. Macedo, A. Fantin, D. Willemann, F. A. Silva, S. Soares, A. Albertazzi

Proceedings Volume 10329, 103291V (2017) https://doi.org/10.1117/12.2270289

KEYWORDS: Shearography, Inspection, Mirrors, Composites, Endoscopy, Interferometers, Analytical research

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Proceedings Article | 28 August 2016 Paper

Analysis of a shearography device using a Wollaston prism and polarization phase shifting

E. Sanchez, M. Benedet, D. Willemann, A. Fantin, A. Albertazzi

Proceedings Volume 9960, 996015 (2016) https://doi.org/10.1117/12.2237395

KEYWORDS: Shearography, Phase shifting, Interferometry, Prisms, Polarization, Interferometers, Environmental sensing, Inspection, Prisms, Environmental sensing, Interferometers, Polarizers, Phase shifts

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Proceedings Article | 28 August 2016 Presentation + Paper

A non-linear piezoelectric actuator calibration using N-dimensional Lissajous figure

A. Albertazzi, M. Viotti, C. L. Veiga, A. Fantin

Proceedings Volume 9960, 99600L (2016) https://doi.org/10.1117/12.2237367

KEYWORDS: Phase shifting, Calibration, Phase shifts, Actuators, Interferometry, Ferroelectric materials, Sensors, Feedback control, Ions, Mirrors

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Proceedings Article | 18 August 2014 Paper

Performance evaluation of a phase retrieval algorithm from sequences of interferograms with unknown phase shifts using generalized N-dimensional Lissajous figures

Armando Albertazzi Jr., Analucia Fantin, Mauro Benedet, Daniel Willemann, Allison Maia

Proceedings Volume 9203, 92030O (2014) https://doi.org/10.1117/12.2063352

KEYWORDS: Phase shifts, Phase shifting, Phase retrieval, Interferometry, Field emission displays, Fourier transforms, Modulation, Neodymium, Phase shift keying, Fringe analysis

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Proceedings Article | 13 May 2013 Paper

A computational tool to highlight anomalies on shearographic images in optical flaw detection

A. Fantin, D. Willemann, M. Viotti, A. Albertazzi

Proceedings Volume 8788, 87880L (2013) https://doi.org/10.1117/12.2020978

KEYWORDS: Shearography, Inspection, Image processing, Nondestructive evaluation, Composites, Fringe analysis, Damage detection, Visualization, Interferometry, Holography

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Proceedings Article | 13 September 2012 Paper

Improvements in the marking of defects on large structures surfaces during shearographic inspection

A. Fantin, D. Willemann, A. Albertazzi

Proceedings Volume 8494, 84940B (2012) https://doi.org/10.1117/12.929553

KEYWORDS: Inspection, Projection systems, Cameras, Composites, Shearography, Nondestructive evaluation, Image processing, Multimedia, Fringe analysis, Calibration

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Proceedings Article | 27 May 2011 Paper

Measurement and characterization of cylindrical surfaces by deflectometry applied to ballistic identification

A. Fantin, C. Veiga, A. Albertazzi

Proceedings Volume 8082, 808214 (2011) https://doi.org/10.1117/12.888201

KEYWORDS: Deflectometry, Mirrors, Weapons, Cameras, Firearms, Reflectivity, Optical components, Forensic science, Optical testing, Signal processing

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Proceedings Article | 14 September 2010 Paper

Defect assessment of bonded joints of composite tubes using shearography

Daniel Willemann, Analucia Fantin, Armando Albertazzi Gonçalves

Proceedings Volume 7387, 73870J (2010) https://doi.org/10.1117/12.870680

KEYWORDS: Shearography, Composites, Inspection, Fringe analysis, Adhesives, Head, Sensors, Visualization, Epoxies, Glasses

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Proceedings Article | 17 June 2009 Paper

Development and application of a photogrammetric endoscopic system for measurement of misalignment and internal profile of welded joints in pipelines

Armando Albertazzi G., Allan Hofmann, Analucia Fantin, João M. C. Santos

Proceedings Volume 7389, 73891W (2009) https://doi.org/10.1117/12.827544

KEYWORDS: Cameras, 3D image processing, Axicons, Projection systems, Endoscopes, Fringe analysis, Phase shifts, Photogrammetry, Calibration, Prototyping

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Proceedings Article | 3 October 2008 Paper

An endoscopic optical system for inner cylindrical measurement using fringe projection

Armando Albertazzi G., Allan Hofmann, Analucia Fantin, João M. C. Santos

Proceedings Volume 7155, 715514 (2008) https://doi.org/10.1117/12.814540

KEYWORDS: Cameras, Axicons, 3D image processing, Clouds, Endoscopes, 3D metrology, Projection systems, Photogrammetry, Fringe analysis, Calibration

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Proceedings Article | 29 August 2008 Paper

Measurement and stitching of regular cloud of points

A. Fantin, T. Pinto, C. de Carvalho, A. Albertazzi

Proceedings Volume 7066, 706607 (2008) https://doi.org/10.1117/12.797578

KEYWORDS: Cameras, Clouds, Calibration, 3D metrology, 3D acquisition, 3D image processing, Image processing, Fringe analysis, Optical spheres, 3D modeling

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Proceedings Article | 18 June 2007 Paper

A novel algorithm to stitch adjacent cloud of points of long cylindrical surfaces

M. Viotti, A. Albertazzi, A. Dal Pont, A. Fantin

Proceedings Volume 6616, 66161E (2007) https://doi.org/10.1117/12.726166

KEYWORDS: Clouds, Mirrors, Interferometers, Computer simulations, Optical testing, Optical interferometry, Beam splitters, Collimation, Fringe analysis, Metrology

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Proceedings Article | 18 June 2007 Paper

An efficient mesh oriented algorithm for 3D measurement in multiple camera fringe projection

A. Fantin, A. Albertazzi, T. Pinto

Proceedings Volume 6616, 66161B (2007) https://doi.org/10.1117/12.724805

KEYWORDS: Cameras, 3D metrology, Calibration, Projection systems, Clouds, 3D image processing, Optical spheres, Imaging systems, 3D modeling, Fringe analysis

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Proceedings Article | 21 June 2006 Paper

Comparison between temporal and spatial phase unwrapping for damage detection using shearography

A. Fantin, A. Dal Pont, D. Willemann, A. Albertazzi

Proceedings Volume 6345, 634510 (2006) https://doi.org/10.1117/12.693149

KEYWORDS: Shearography, Composites, Phase shifts, Nondestructive evaluation, Phase shift keying, Damage detection, Fringe analysis, Image quality, Sensors, Head

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Proceedings Article | 27 May 2003 Paper

Digital complex holography using a shearing interferometer: improvements and recent results

Armando Albertazzi, Analucia Vieira Fantin

Proceedings Volume 4933, (2003) https://doi.org/10.1117/12.516574

KEYWORDS: Digital holography, Holograms, Holography, Mirrors, Shearing interferometers, 3D image reconstruction, Interferometers, Phase shifts, Holographic interferometry, Wavefronts

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Proceedings Article | 20 June 2002 Paper

Digital complex holography using a shearing interferometer: principles and early results

Armando Albertazzi, Analucia Vieira Fantin

Proceedings Volume 4777, (2002) https://doi.org/10.1117/12.472204

KEYWORDS: Digital holography, Holograms, Mirrors, Holography, Shearing interferometers, Interferometers, 3D image reconstruction, CCD cameras, Charge-coupled devices, Wavefronts

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Showing 5 of 22 publications

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