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Moiré interferometry is introduced as an outgrowth of moiré fringe multiplication. Coherent laser light enabled the practical implementation of virtual reference gratings and high-frequency specimen gratings. Reliable analysis of shear depended upon the ideas in a little-known paper. These three facets are the essence of current techniques. Present-day applications are exemplified by work in electronic...
Optical fibre Bragg grating sensors have proved in the past years to be extremely useful tools for internal strain measurements in layered composite materials. Two applications of this type of technology are presented in this paper. Firstly, embedded Bragg grating sensors are used to study the through-the-thickness strain field of laminated plates in various quasi-static loading cases. It is shown...
Radial displacements on an axial surface of a rotating disk can be measured with optoelectronic sensing devices consisting of infrared emitters and phototransistors. The aim of this investigation is to improve the stability and robustness of a previously described optoelectronic measurement system. Stability is improved by a computerized algorithm for the control of the emitter intensity based on...
A measuring machine based on a stereo device is developed for analyzing large sheet metal parts deformed by deep drawing. A cross grating on the surface is subdivided into meshes which are uniquely encoded by circular marks. This provides absolute indices for each grating point when taking segments of the surface by the stereo device. Hence overlapping areas can be used to fit together the segments...
An understanding of the fracture process is necessary for design and utilization of quasi-brittle materials since cracking characterizes their failure. Subregion Scanning Computer Vision (SSCV) is an effective tool for observing these processes in an experimental setting. SSCV, based on Digital Image Correlation (DIC), is a full-field technique for quantitatively examining the development of cracks,...
Four approaches, a novel, two modified and a previous developed approaches, are compared for the determination of the total fringe orders using different wavelengths. The results show that an error of 0.05 fringes can be achieved by all methods. The MIN-MAX method gives the best result for fringe orders greater than 0.6, a better result can be given by the rest methods for fringe orders less than...
Commonly used techniques for analysis of regional heart function include sonomicrometry, implanted markers, and surface markers. However, these techniques cannot offer the high spatial resolution needed to define regional abnormalities in the heart. We have recently applied a computer aided speckle interferometry technique (CASI) with high spatial resolution to measuring the deformation of heart muscle...
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