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Grating Interrogations: from Small to Large Strain Measurement
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In this article, the authors used a Fourier transform to characterize a cross grating marked on the surface of a specimen using a master grid and applied it to the analysis of the grating.Abstract:
Our purpose is the direct strain measurement from the interrogation of a crossed grating marked on the surface of a specimen. The observation of the object through a master grid (as in moire method) is replaced by a direct characterization of the pattern using a Fourier transform. This gives direct access to the modification of the pitches which leads to quantification of the strain without the intermediary of a fringe pattern. The comparison between the undeformed and deformed states allows the determination of the magnitude and orientation of principal strains and of the local rigid-body rotation. We describe three analysis techniques, one using the diffraction phenomenon, another utilizing a numerical spectral evaluation and third combining diffraction and phase-shifting procedure. These grid interrogations have different domains of application and a suitable choice of these analysis techniques allows a very large measurement range (10−5 to high strain according to the grating resistance).read more
Citations
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Coaxial cable bragg grating sensor
TL;DR: In this article, a coaxial cable sensor device with periodic impedance discontinuities along the length of its cable is described, which can be used to measure temperature, pressure, strain, and acoustic waves in building structures.
Journal ArticleDOI
Development of the marks tracking technique for strain field and volume variation measurements
TL;DR: In this article, a simple and efficient mark tracking method for local strain measurement is presented. But the method is insensitive to illumination variation and to in-plane rotation of the specimen.
Journal ArticleDOI
An extrinsic Fabry?Perot interferometer-based large strain sensor with high resolution
TL;DR: In this article, a three-layer packaged structure is proposed for an extrinsic Fabry?Perot interferometer-based optical fiber sensor in order to produce high resolution for large strains.
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Coaxial cable Bragg grating
TL;DR: In this paper, a coaxial cable Bragg grating was fabricated by drilling holes into the cable at periodic distances along the axial direction, which was tested for the potential application as a strain-sensing device.
Journal ArticleDOI
Three Optical Procedures for Local Large‐Strain Measurement
TL;DR: In this article, a cross grating was used to measure large strain in polymers and latex materials, with a strain accuracy close to 5 times10-4 at minimum gauge lengths of 0.125 mm.
References
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Book
Principles of Optics
TL;DR: In this paper, the authors discuss various topics about optics, such as geometrical theories, image forming instruments, and optics of metals and crystals, including interference, interferometers, and diffraction.
Principles of Optics
TL;DR: In this article, the authors discuss various topics about optics, such as geometrical theories, image forming instruments, and optics of metals and crystals, including interference, interferometers, and diffraction.
Journal ArticleDOI
Phase-shifting speckle interferometry
TL;DR: One application of phase-shifting techniques to speckle interferometry is finding the phase of deformations, where up to ten waves of wavefront deformation can easily be measured.
Journal ArticleDOI
Digital phase stepping speckle interferometry
David W. Robinson,D. C. Williams +1 more
TL;DR: In this paper, a variation of electronic speckle pattern interferometry (ESPI) is presented whereby phase fringes are produced in contrast to speckles correlation fringes.
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