Automatic analysis of moiré fringe patterns by using an image-processing system

Pan, Ning; Peng, Wen-Li

doi:10.1007/bf02325175

Cited by 4 publications

(2 citation statements)

References 6 publications

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“…Kang et al [2] investigated experimentally the interfacial behaviour of polymer bimaterials. Recently, a new method, called phase shift moiré interferometry, was proposed for investigating fracture mechanical problems [3][4][5]. The method combines moiré interferometry with phase shift and image processing and retains the advantages of moiré interferometry such as non-contact, real time and high spatial resolution.…”

Section: Introductionmentioning

confidence: 99%

Analysis of displacement and strain field around a bimaterial interfacial region by stress couple theory and experiment

Kang

Wang

et al. 2002

The Journal of Strain Analysis for Engineering Design

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This paper is concerned with the determination of displacement and strain fields within the interfacial region of a bimaterial specimen under shear loading. The analysis is based on the couple stress theory. The measurements are made by means of phase shift moiré interferometry which has been recognized as a useful measuring method by combining moiré interferometry with the phase shift technique and image processing. The results obtained by phase shift moiré interferometry show that the distribution of the shear strain, rotation angle and rotation gradient at the interface region are changing rapidly. The results show good agreement with those predicted by stress couple theory.

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Section: Introductionmentioning

confidence: 99%

Analysis of displacement and strain field around a bimaterial interfacial region by stress couple theory and experiment

Kang

Wang

et al. 2002

The Journal of Strain Analysis for Engineering Design

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“…Digital image processing is the technique used in this work to record andanalyze a moire fringe pattern in order to determine the light intensity values required in equation(3.6) to compute displacements. Since the moire image contains a large amount of data over the full field, it is necessary to capture the data by an automatic method[25]. Digital image processing is capable of acquiring data over a wide range of shades of gray.…”

mentioning

confidence: 99%

Moire´ Interferometry Analysis of Laser Weld Induced Thermal Strain

Kowalski

Voloshin

1994

Journal of Electronic Packaging

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An experimental method is presented to study laser weld induced thermal strain using digital image analysis enhanced moire´ interferometry. A phenomenon that occurs in the assembly of optical components is that the final optimum coupled power will randomly change upon completion of the laser weld process. The change in power is due to residual thermal stresses being generated in the welded components. For single mode devices, relative motions of the components in the order of 1 μm could result in a 1 dB degradation of coupled power. The behavior of thermal strain is unpredictable since the relative orientation of the optical components at the optimum alignment is random. The goal of this investigation was to perform a baseline study of parameters affecting laser weld thermal strain. The first phase of the work was to study thermal strain induced by a single weld on a flat Kovar plate. The results show that thermal strain is independent of material inhomogeneity. However, this investigation did reveal asymmetry of the power distribution in the weld laser with a principal axes offset +30 deg from horizontal. The second phase of the experiment was to characterize thermal strain resulting from welding on an interface of two Kovar plates. The results indicate that thermal strain at the center of two welds is not affected by welds that are greater than 1 mm apart. Also, thermal strain levels at locations adjacent to the weld are not significantly affected by weld separation distance. This study successfully demonstrated that digital image analysis enhanced moire´ interferometry can be used in the study of laser weld induced thermal strain. Digital image processing, fractional fringe analysis, and high frequency specimen gratings increase sensitivity levels to enable the technique to be used to characterize submicron thermal distortions.

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Phase-measuring profilometry using sinusoidal grating

Chang

1993

Experimental Mechanics

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Automatic analysis of moiré fringe patterns by using an image-processing system

Cited by 4 publications

References 6 publications

Analysis of displacement and strain field around a bimaterial interfacial region by stress couple theory and experiment

Analysis of displacement and strain field around a bimaterial interfacial region by stress couple theory and experiment

Moire´ Interferometry Analysis of Laser Weld Induced Thermal Strain

Phase-measuring profilometry using sinusoidal grating

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