Journal ArticleDOI
Image-shearing camera for direct measurement of surface strains.
Y.Y. Hung,C. Y. Liang +1 more
TLDR
A new image-shearing camera which focuses two laterally sheared images at the film plane and becomes a shearing interferometer, which directly measures the derivatives of the surface displacements.Abstract:
This paper describes a new image-shearing camera which focuses two laterally sheared images at the film plane. With coherent illumination, this camera becomes a shearing interferometer, which directly measures the derivatives of the surface displacements. This strain measuring tool enjoys several advantages over the conventional, holographic, and speckle interferometry, namely, (1) better fringe quality (than speckle interferometry); (2) does not require special vibration isolation; (3) very simple optical setup; (4) direct determination of strains; and (5) extended controllable range of sensitivity.read more
Citations
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Journal ArticleDOI
Shearography technology and applications: a review
TL;DR: A comprehensive overview of shearography is presented, describing the principle of operation, optical configurations, image processing algorithms and applications, with a focus on more recent technological advances.
Journal ArticleDOI
Digital recording and reconstruction of holograms in hologram interferometry and shearography
Ulf Schnars,W. Jüptner +1 more
TL;DR: The fundamentals of digital recording and mathematical reconstruction of Fresnel holograms are described and it is shown that the evaluation technique, e.g., hologram interferometry or shearography, can be influenced by numerical methods.
Journal ArticleDOI
Fringe analysis: Premise and perspectives
TL;DR: Keywords: fringe analysis Reference EPFL-ARTICLE-176959doi:10.1016/j.optlaseng.2012.04.006View record in Web of Science URL: http://www.sciencedirect.com/science/article/pii/S0143816612001182
Journal ArticleDOI
Digital speckle-pattern shearing interferometry.
TL;DR: Experimental results in the three cases of slope of normal displacement, surface strain, and slope of vibration amplitude measurements are presented and Interpretation leads to conditions of maximum fringe contrast and the limitation of this technique.
Journal ArticleDOI
Quantitative evaluation of digital shearing interferogram using the spatial carrier method
TL;DR: In this paper, the authors describe a digital shearing interferometer system composed of a Mach - Zehnder interferometers which allows us to split the image of one object and to recombine the two images shifted and tilted.
References
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Journal ArticleDOI
An image-shearing speckle-pattern interferometer for measuring bending moments
J A Leendertz,J N Butters +1 more
TL;DR: In this paper, a fringe system is obtained showing contours of constant slope resolved in the direction of image displacement, which is a comparison with result obtained by holographic interferometry.
Journal ArticleDOI
A speckle-shearing interferometer: A tool for measuring derivatives of surface displacements
TL;DR: In this paper, a speckle-shearing interferometer was developed using a sheared Michelson interferometers, which utilizes the speck effect of coherent light.
Journal ArticleDOI
Laser speckle interferometry for plate bending problems.
Fu-Pen Chiang,Ren-Ming Juang +1 more
TL;DR: A method is proposed whereby the spatial speckles created in front of a plate with an optically rough surface when illuminated by a coherent laser beam is used to generate slope contour fringes via double exposure.
Journal ArticleDOI
Speckle-Shearing Interferometric Technique: a Full-Field Strain Gauge
TL;DR: An improved speckle-shearing interferometric method is presented that allows simultaneous determination of derivatives of surface displacements of a structure with respect to four different directions and thus is adaptable to nonlaboratory environments.
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An image-shearing speckle-pattern interferometer for measuring bending moments
J A Leendertz,J N Butters +1 more