Automated fringe pattern analysis for moiré interferometry

Poon, Chung Keung; Kujawinska, M.; Ruiz, C.

doi:10.1007/bf02322579

Cited by 21 publications

(6 citation statements)

References 6 publications

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“…In general, this is known and independent of position. Further, the parameter δ may be varied by means of the optical flat on the interferometer, and this leads to the concept of temporal phase shifting 23 . Hence, to determine φ, it is necessary to take three measurements of I at different values of δ and then to solve three simultaneous to obtain a , b and φ.…”

Section: Moiré Interferometrymentioning

confidence: 99%

Optical methods for measurement of fatigue crack closure: moiré interferometry and digital image correlation

Nowell

Paynter

Matos

2010

Fatigue Fract Eng Mat Struct

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A B S T R A C T This paper describes three different optical techniques for the measurement of in-plane displacements close to the crack tip which can then be used to determine the presence of crack closure in propagating fatigue cracks. Conventional temporal phase shifting moiré interferometry is described first, followed by an improvement to this technique, load sequence phase stepping, which allows data to be collected much more frequently during a load cycle. Finally, more recent measurements using digital image correlation are reported. Results from all three techniques are compared and the advantages and disadvantages of each approach are discussed.

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Section: Moiré Interferometrymentioning

confidence: 99%

Optical methods for measurement of fatigue crack closure: moiré interferometry and digital image correlation

Nowell

Paynter

Matos

2010

Fatigue Fract Eng Mat Struct

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“…For most macromechanics analyses, moiré interferometry provides a great number of stress-induced fringes, sufficient for a detailed analysis. Yet, in current practice, there is a tendency to use phase-stepping schemes to reduce these data to graphs of displacement and strain distributions [70][71][72][73][74][75]. In many cases, the measurements are conducted at abnormally low load levels in order to reduce the number of moiré fringes in the field, since the phase-stepping algorithms are more effective with sparse fringe patterns.…”

Section: Data Reduction From Single Imagesmentioning

confidence: 99%

Moiré interferometry for engineering mechanics: Current practices and future developments

Han

Post

Ifju

2001

The Journal of Strain Analysis for Engineering Design

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In the past decade, the optical method called moiré interferometry has matured rapidly to emerge as an invaluable tool, proved by many industrial and scientific applications. It has been applied to numerous problems in engineering mechanics. It measures in-plane displacement fields with high sensitivity and high spatial resolution. This paper reviews current practices of moiré interferometry and its extensions. Applications in diverse fields are addressed to demonstrate the wide applicability of the method, especially the recent applications for thermal deformation analyses of microelectronics devices. Speculation on future developments and practices is presented.

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“…By varying the angle with respect to the normal incidence of the wavefront, one can obtain a series of phase shifts. The plate must be of a high quality in order to obtain a uniform value for the additional phase (Brown 1993, Kaufmann and Jacquot 1990, Poon et al 1993.…”

Section: 21mentioning

confidence: 99%

Phase-evaluation methods in whole-field optical measurement techniques

Dorrio

Fernández

1999

Meas. Sci. Technol.

137

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Many optical measurement techniques provide fringe patterns as their results. The decodification processes that employ one or several fringe patterns to automatically retrieve the phase are generally designated as phase-evaluation methods. In this work, an overview of these methods will be schematically presented. Their particular performances will be compared, stressing their main advantages and drawbacks. An important group of these methods employs the well-known phase-shifting algorithms as a tool for calculating the phase. In the general form of these algorithms, the principal value of the optical phase is computed by an inverse trigonometric function whose argument is a combination of phase-shifted intensity values, provided by the modulation of one or several fringe patterns. These algorithms will be also studied in the general context of the phase-evaluation methods.

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Automated fringe pattern analysis for moiré interferometry

Cited by 21 publications

References 6 publications

Optical methods for measurement of fatigue crack closure: moiré interferometry and digital image correlation

Optical methods for measurement of fatigue crack closure: moiré interferometry and digital image correlation

Moiré interferometry for engineering mechanics: Current practices and future developments

Phase-evaluation methods in whole-field optical measurement techniques

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