Some applications of holographic interferometry

Gottenberg, W. G.

doi:10.1007/bf02326001

Cited by 30 publications

(6 citation statements)

References 6 publications

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“… Among many optical full‐field techniques [1–3], digital image correlation (DIC [4, 5]) is used to measure both in‐plane displacements and strain. The principle is based on images captured on the surface of the sample at two loading steps.…”

Section: Introductionmentioning

confidence: 99%

Dissipative Behaviour Analysis of Reprocessed Polyethylene Terephthalate using Digital Image Correlation and Updated Finite Element Analysis

Caro-Bretelle

Ienny

Naït-Ali

et al. 2013

Strain

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Polyethylene terephthalate (PET) is a semi-crystalline polyester that is usually processed by conventional methods. However, the degradation of this polyester during the melting process impacts its macroscopic behaviour, which is particularly true for recycled PET that is subjected to multiple processes at the melting temperature by extrusion, injection-moulding or pelletizing. In this work, the impact of reprocessing on the mechanical properties of PET is studied. This approach requires exploring the influence of implementation on both its own mechanical performance factor and on the damage linked to the striction problem. An experimental protocol was developed to study large strain responses through a set of sequenced and instrumented uniaxial traction tests based on the standard ISO-5272-1-A and hourglass geometries. Updated finite element simulations were coupled with digital image correlation, thereby providing access to the parameters of a phenomenological model. This coupled approach enables researchers to understand both the complex shape of the stress-strain curve and the well-known dilatant mechanism that is observed during uniaxial deformation.

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Section: Introductionmentioning

confidence: 99%

Dissipative Behaviour Analysis of Reprocessed Polyethylene Terephthalate using Digital Image Correlation and Updated Finite Element Analysis

Caro-Bretelle

Ienny

Naït-Ali

et al. 2013

Strain

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“…Optical techniques such as moiré interferometry (Post, 1983), holography (Fottenburg,,1969) and speckle inteferometry (Wang, Chen and Chiang, 1993) have been proven to be matured techniques to analyze macroscopic parameters and are being applied successfully in many different applications. However, all the interferometric techniques have stringent requirements for system's stability.…”

Section: Introductionmentioning

confidence: 99%

In-plane strain measurement by digital image correlation

Hung¹,

Voloshin²

2003

J. Braz. Soc. Mech. Sci. & Eng.

168

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“…An early demonstration of the capability of HI for vibration and propagating wave measurements together with brief descriptions of "live" (called in the article "real-time") observation and "double-exposure" techniques is [Got68]. Other examples of wave propagation experiments can be found in e.g.…”

Section: (Pulse) Espi In Applicationmentioning

confidence: 99%

Electronic speckle pattern interferometry

Cloud¹

1995

Optical Methods of Engineering Analysis

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Nondestructive Testing of various kinds is one of the cornerstones in Structural-Health-Monitoring concepts, maintenance plans, and quality management. Increasing automation and speed of production processes is motivating research on appropriately instrumented Nondestructive Testing methods that also show potential for automation. Furthermore, an increasing use of advanced engineering materials and the simultaneously occurring challenges in detection and assessment of damage is motivating research into suitable additional and complementary inspection methods. Commercial off-the-shelf measurement systems, which can be easily adapted to a specific task, are of special interest in industry. This research work investigates the feasibility and applicability of visual defect detection with a commercial double-pulse Electronic Speckle Pattern Interferometry (ESPI) system, based on impact-excited elastic waves, on methods with forced vibrations, and on methods with thermoelastic deformations. In the case of forced vibrations, methods are adopted that show an increased potential of defect-selectivity. Elements of civil infrastructure (made of reinforced concrete-a slab track segment, block sleepers, sleepers) are investigated for defects with respect to instrumented NDT in quality management. The traditional single-exciter "mode studies" method in use with doublepulse ESPI is extended with multi-exciter methods adapted from vibration testing. The potential of successful application can be concluded for all of the applied excitation methods. Samples of advanced engineering materials (CFRP laminates, composite honeycomb) are investigated for artificial defects with elastic-wave and vibration-based methods and with thermoelastic deformations. The traditional "mode studies" method is complemented with "chirp" and band-limited "narrow noise" excitation. The potential of successful application and increased defect-selectivity can be demonstrated for the vibration methods. Further advance in elastic-wave and thermoelastic-deformation-based defect detection in CFRP laminates will become possible by gaining skill and experience in defect-pattern recognition. A full-scale skin-stringer structure (an elevator flap of a Breguet 1150 aircraft) is tested with elastic waves and forced vibrations. First insights are gained into the "full-field" appearance of related phenomena. This complements on the one hand the analysis of such structures to date and, on the other hand, points out the challenges confronting visual defect detection. In all cases under consideration, the encouraging results obtained justify continuing research and proposals for future work are put forward. THIS PAGE INTENTIONALLY LEFT BLANK List of Acronyms and Abbreviations xix * Symbols/quantities in common use, auxiliary variables. † Dimensions, geometric quantities. ‡ Complex and phasor notation. § Propagation of light and speckle interferometry. Continuum mechanics and elastic waves. # Wave propagation in periodic structures. * "live", † double/multi pulsed, ‡ strob...

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Some applications of holographic interferometry

Cited by 30 publications

References 6 publications

Dissipative Behaviour Analysis of Reprocessed Polyethylene Terephthalate using Digital Image Correlation and Updated Finite Element Analysis

Dissipative Behaviour Analysis of Reprocessed Polyethylene Terephthalate using Digital Image Correlation and Updated Finite Element Analysis

In-plane strain measurement by digital image correlation

Electronic speckle pattern interferometry

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