Journal ArticleDOI
Real-time analyzer of displacement and strain distributions using moiré method
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TLDR
In this paper, a system for real-time measurement of deformation of structures by processing the grating images of the structures obtained by a TV camera has been developed, which is whole field, noncontact and produces a realtime measurement.Abstract:
A system for real-time measurement of deformation of structures by processing the grating images of the structures obtained by a TV camera has been developed. The advantages of the system are: (1) the method is whole field, noncontact and produces a real-time measurement; (2) wide application of this method is possible. Displacement and strain distributions on any size of surface and any material can be measured if a grating can be drawn or projected on the material or a carrier fringe pattern can be obtained and recorded by a TV camera; and (3) motions of objects may be detected in real time using this system.read more
Citations
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Real-time Shape Measurement by Integrated Phase-Shifting Method
Abstract: Phase distribution analysis of deformed gratings in moire method and grating projection method provides accurate shape of specimen. We previously proposed the phase-shifting method using correlation with a rectangular function. The phase analysis uses many images during phase shifting of the projected grating. In this paper, we propose a new real-time phase analysis method, that is, the integrated phase- shifting method using four images of phase-shifted grating patterns with a rectangular brightness distribution. The theory and some applications to shape measurement are shown.
Journal ArticleDOI
Scanning moiré method for obtaining smooth fringe patterns
TL;DR: This paper proposes a new scanning moire method to produce smooth fringe patterns without jaggy fringes from phase-shifted grating patterns.
Journal ArticleDOI
Accuracy of Real-Time Shape Measurement by Phase-Shifting Grid Method Using Correlation
TL;DR: In this paper, a real-time shape measurement with a phase-shifting grid method using correlation is proposed, where contour lines of objects are obtained as phase values in real time with this method.
Proceedings ArticleDOI
Real-time phase distribution analysis of fringe patterns
TL;DR: In this paper, a phase-shifting scanning moire method and a phasedifference scanning Moire method are developed by using the correlation of the rectangular brightness of a projected grid and two rectangular functions to determine a phase.
References
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Journal ArticleDOI
Deformation measurement during powder compaction by a scanning-moiré method
Yoshiharu Morimoto,T. Hayashi +1 more
TL;DR: In this paper, an image-processing system employing a personal computer to analyze the moire pattern is introduced, and many strain distributions obtained in this way from moire-fringe patterns are presented.
Journal ArticleDOI
Two-dimensional moiré method and grid method using Fourier transform
TL;DR: In this paper, the authors presented one-dimensional strain analysis by a moire method using a Fourier transform and extended it to two-dimensional analysis by introducing digital image processing.
Journal ArticleDOI
Application Of Moire Analysis Of Strain Using Fourier Transform
TL;DR: In this article, a complex moire pattern was obtained by shifting the discrete Fourier spectrum of the image of a deformed grating, from which strain distribution was given as the derivatives of the phases of the complex Moire fringes.
Journal ArticleDOI
Strain analysis by mismatch moire method and grid method using Fourier transform
TL;DR: In this article, a new method of the moire analysis of strain using the Fourier transform was presented, which uses the phase information of the mauve fringe brightness to obtain the complex moire pattern.
Journal ArticleDOI
Strain Measurement by Scanning-moire Method
TL;DR: In this article, the effects of thinning out of scanning lines and the relation between moire fringes and strain are studied by the sampling theorem, where deformed model gratings are sampled by a television camera and they are thinned out properly by using an image processing system.
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Application Of Moire Analysis Of Strain Using Fourier Transform
Deformation measurement during powder compaction by a scanning-moiré method
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