Journal ArticleDOI
Determination of basic grids for subtractive moire patterns.
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TLDR
The simple formula derived in the paper establishes a direct relationship between moire beat patterns and basic grids for minute displacements and possible advantages of the practical use of this element are outlined.Abstract:
The simple formula derived in the paper establishes a direct relationship between moire beat patterns and basic grids for minute displacements. The possibilities of finding a basic grid for a desired moire pattern are pointed out. The analysis is illustrated by several examples of Fresnel moire zone plate patterns and concentric equidistant circular moire patterns obtained by changes of scale and rotation. Possible advantages of the practical use of this element are outlined.read more
Citations
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Journal ArticleDOI
Adjustable refractive power from diffractive moiré elements
TL;DR: It is shown how suitable combinations of cascaded diffractive optical elements can form a combined "moiré DOE" of adjustable refractive power and high diffraction efficiency.
Journal ArticleDOI
Demonstration of focus-tunable diffractive Moiré-lenses.
TL;DR: The experimental investigation shows that the Moiré-lenses have a broad adjustable refractive power range with a high efficiency, which allows one to use them for flexible beam steering and for imaging applications.
Book ChapterDOI
Recent Advances in Optical Image Processing
Ayman Alfalou,Christian Brosseau +1 more
TL;DR: Optical processing of images has received much attention recently as mentioned in this paper, mainly by studying correlation applications for identification and tracking, two-dimensional and three-dimensional holography, compression and encryption of images, etc.
Patent
Optical device with a pair of diffractive optical elements
TL;DR: In this paper, a plate-like diffractive optical element is arranged in parallel to each other in order to perform similar tasks, such as acting as a lens, an axicon, a phase shifter, or a spiral phase plate.
Journal ArticleDOI
Variable aberration generators using rotated Zernike plates
Eva Acosta,Salvador Bará +1 more
TL;DR: The rotational properties of Zernike polynomials allow for an easy generation of variable amounts of aberration using two rotated phase plates, each one encoding one or several ZERNike modes.
References
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Journal ArticleDOI
Variable Fresnel Zone pattern.
Adolf W. Lohmann,D. P. Paris +1 more
TL;DR: Four ways of creating a FZP pattern as a moiré effect by superposing pairs of suitable masks are described, sufficiently general to allow the synthesis of patterns other than the FzP by means of a variable moirÉ effect.
Journal ArticleDOI
Precision Alignment Using a System of Large Rectangular Fresnel Lenses
TL;DR: A system of large rectangular Fresnel lenses has been used in the laser alignment system for the SLAC two-mile accelerator.
Journal ArticleDOI
Varifocal moiré zone plates for straightness measurement
J. M. Burch,D. C. Williams +1 more
TL;DR: A Fresnel zone plate of variable size can be formed as a moiré pattern between a suitable pair of identical grids to monitor the straightness of a continuous linear motion.
Journal ArticleDOI
Moire fringes by evolute gratings.
TL;DR: Analytical expressions describing the moire fringes formed by two periodic structures consisting of the evolutes of a circle are derived.
Journal ArticleDOI
Moiré Fringes as Visual Position Indicators
TL;DR: A summary of the main known forms of moire fringes for visual metrological applications is given in this paper, where a recognizable unique fringe indicates an also unique position of a grating, displaced relative to its stationary counterpart.