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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Patent•
21 Jan 1969
TL;DR: In this article, a technique for observing and measuring the contour of a surface with moire optical interference patterns was proposed, which can be viewed as contour lines appearing on the surface and representing actual regions of equal elevation of the surface contour.
Abstract: A technique for observing and measuring the contour of a surface with moire optical interference patterns. Illumination diverging from a source passes through a periodically repetitive image structure to cast a shadow image of such structure onto a surface being examined. The surface and the shadow image cast thereon are viewed through a periodically repetitive image structure to establish moire interference patterns. These moire interference patterns can be viewed as contour lines appearing on the surface and representing actual regions of equal elevation of the surface contour, and the actual increments of elevation between adjacent moire fringes can be determined.
49 citations
TL;DR: The proposed median-Gaussian filtering framework shows good results for STXM images with the size of power of two, if such parameters as threshold, sizes of the median and Gaussian filters, and size of the low frequency window, have been properly selected.
49 citations
49 citations
Patent•
07 Nov 1983TL;DR: In this article, a fiducial line pattern reticle illuminated by CW or pulsed laser light is projected on a corneal surface through lenses, a prismoidal beamsplitter quarterwave plate, and objective optics.
Abstract: A computer assisted keratometer in which a fiducial line pattern reticle illuminated by CW or pulsed laser light is projected on a corneal surface through lenses, a prismoidal beamsplitter quarterwave plate, and objective optics. The reticle surface is curved as a conjugate of an ideal corneal curvature. The fiducial image reflected from the cornea undergoes a polarization shift through the quarterwave plate and beamsplitter whereby the projected and reflected beams are separated and directed orthogonally. The reflected beam fiducial pattern forms a moire pattern with a replica of the first recticle. This moire pattern contains transverse aberration due to differences in curvature between the cornea and the ideal corneal curvature. The moire pattern is analyzed in real time by computer which displays either the CW moire pattern or a pulsed mode analysis of the transverse aberration of the cornea under observation, in real time. With the eye focused on a plurality of fixation points in succession, a survey of the entire corneal topography is made and a contour map or three dimensional plot of the cornea can be made as a computer readout in addition to corneal radius and refractive power analysis.
49 citations
TL;DR: In this paper, the complete state of strain throughout an extended field can be determined from a single photograph by the moire grid-analyzer method, where two families of moire fringes appear simultaneously, providing displacements inx andy directions throughout the field.
Abstract: The complete state of strain throughout an extended field can be determined from a single photograph by the moire grid-analyzer method. Grids are used for the active, or specimen screen, and for the rigid analyzer screen. Hence, two families of moire fringes appear simultaneously, providing displacements inx andy directions throughout the field.
47 citations