Computerized fringe analysis in photomechanics

Chen, T. Y.; Taylor, C. E.

doi:10.1007/bf02321416

Cited by 39 publications

(6 citation statements)

References 7 publications

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“…The first “fringe thinning” 27,28 techniques to appear started with a binary image. The algorithm proposed by Chen and Taylor 29 was among the simplest and the most effective. Searching for better results, masked‐based techniques emerged to be applied on a gray‐scale image.…”

Section: Image Digitalizationmentioning

confidence: 99%

Data Acquisition Techniques in Photoelasticity

Fernández¹

2010

Experimental Techniques

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Section: Image Digitalizationmentioning

confidence: 99%

Data Acquisition Techniques in Photoelasticity

Fernández¹

2010

Experimental Techniques

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“…The peak detection method is more sensitive to noise than its binary counterparts, but it offers the prospect of higher resolution detection of the fringe centers. (3) Binarization: In the binarization process, the gray levels above or below a threshold value are truncated to the maximum or zero intensity, respectively, to convert the image into a binary intensity image [26][27][28]. The mean intensity of the fringe pattern can be chosen as the binarization threshold.…”

Section: Fringe Centering Methodsmentioning

confidence: 99%

Study on Deformation of Polycrystalline Aluminum Alloy Using Moiré Interferometry

et al. 2006

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Polycrystalline aluminum alloy is manufactured by annealing, compared to the width of the specimen, the size of the grains can not be omitted, which makes the specimen anisotropic. Under uniaxial tension, the deformation field is inhomogeneous. In this study, moiré interferometry is successfully applied to measure the deformation of the polycrystalline specimen. The experimental results presented the stress versus strain responses of the marked grains in different orientations and different shapes. By using fringe centering method, the strain distributions under certain load in the centers and on the boundaries of the grains are analyzed.

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“…iftwo wavelengths 2 e used, two sets of multiple-valued fringe orders, N1, N2, can be obtained from eq (4). Since the state of strain at the same point is the same for different wavelengths, the follong relationship can be obtained from eq (2): N121fk1=N22/k2 (5) where k1 and k2 are the strain-optical coefficients with respect to wavelengths 2 and 2• For simplicity, let us assume that k1 = k2, the above equation can then be simplified as . N1X1=N222…”

Section: Determination Of Fringe Ordermentioning

confidence: 99%

<title>Whole-field automatic measurements of isochromatics and isoclinics in photoelastic coatings</title>

Chen

1997

SPIE Proceedings

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Digital approaches for determination of fringe order and principal stress direction in photoelastic coatings are presented. The relationships between the intensity values and the fringe orders of two wavelengths, and relevant theory and explicit conditions for directly determining the principal stress angles in the range z/2 are derived. The scheme developed allows for the automatic determination of the fringe orders with or without zero-order fringes in the fringe patterns. Test results are reported.

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Computerized fringe analysis in photomechanics

Cited by 39 publications

References 7 publications

Data Acquisition Techniques in Photoelasticity

Data Acquisition Techniques in Photoelasticity

Study on Deformation of Polycrystalline Aluminum Alloy Using Moiré Interferometry

<title>Whole-field automatic measurements of isochromatics and isoclinics in photoelastic coatings</title>

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