Topic
Moiré pattern
About: Moiré pattern is a research topic. Over the lifetime, 1917 publications have been published within this topic receiving 27176 citations. The topic is also known as: moiré fringes & moire pattern.
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TL;DR: In this paper, a digital shadow moire technique is applied to obtain surface contours by adopting the concept of digital speckle pattern interferometry (DSPI) phase-shifting methods.
7 citations
TL;DR: This study presents a simple method to obtain matched reference patterns using a phase-scan procedure to generate synthetic Moiré images that will enable deflectometric diagnostics of transient phenomena such as laser-produced plasmas and could improve the sensitivity and accuracy of medical phase-contrast imaging.
Abstract: Moire fringe deflectometry with grating interferometers is a technique that enables refraction-based x-ray imaging using a single exposure of an object. To obtain the refraction image, the method requires a reference fringe pattern (without the object). Our study shows that, in order to avoid artifacts, the reference pattern must be exactly matched in phase with the object fringe pattern. In experiments, however, it is difficult to produce a perfectly matched reference pattern due to unavoidable interferometer drifts. We present a simple method to obtain matched reference patterns using a phase-scan procedure to generate synthetic Moire images. The method will enable deflectometric diagnostics of transient phenomena such as laser-produced plasmas and could improve the sensitivity and accuracy of medical phase-contrast imaging.
7 citations
25 Aug 2011
TL;DR: In this paper, a Charge Coupled Device (CCD) is used for capturing the numerical moire fringe, substituting for the usual photodetector, which can be used for measuring the displacement of the object.
Abstract: Moire fringe can be used for measuring the displacement of the object. In this paper, Charge Coupled Device (CCD) is used for capturing the numerical moire fringe, substituting for the usual photodetector. The movable grating is labeled by the special figure, which moves in the moire fringe with the movable grating moving. The original position serves as the reference, and the special figure is searched for in the moire fringe by the correlation operation to determine its shift of pixel in the screen, then by the calibration value to calculate the displacement of the measured object. This method does not need to count the shifting number of the moire fringe. However the lateral magnifying power of lens is considered seriously.
7 citations
TL;DR: In this paper, an extended abstract of a paper presented at Microscopy and Microanalysis 2013 in Indianapolis, Indiana, USA, August 4 -August 8, 2013 is presented.
Abstract: Extended abstract of a paper presented at Microscopy and Microanalysis 2013 in Indianapolis, Indiana, USA, August 4 – August 8, 2013.
7 citations
TL;DR: The present paper illustrates the aspects of a digital imaging system relevant to the determination of fractional fringes, and enables reliable analysis from extremely few fringes.
Abstract: Geometric moire enjoys the advantages of simplicity of technique and equipment, and the ability to use white light. However, resolution has been hampered by difficulties in employing more than 40 l per mm. The present paper illustrates the aspects of a digital imaging system relevant to the determination of fractional fringes, and enables reliable analysis from extremely few fringes.
7 citations