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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.


Papers
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Patent
09 Sep 1985
TL;DR: In this paper, the authors describe an apparatus and a method of analysis of line patterns such as fingerprints, ideograms, or the like, which comprises the steps of superimposing a centrosymmetric reference pattern of lines over the line pattern to be analyzed to form an interferometric pattern of the moire type, and enlarging it until the lines of the reference pattern fill the space between adjacent lines closest to the characteristic element to translate the superimposed line patterns into a field pattern of different optical densities.
Abstract: The disclosure herein describes an apparatus and a method of analysis of line patterns such as fingerprints, ideograms, or the like, which comprises the steps of superimposing a centrosymmetric reference pattern of lines over the line pattern to be analyzed to form an interferometric pattern of the moire type, positioning the reference pattern on a characteristic element of the line pattern to be analyzed, and enlarg­ing it until the lines of the reference pattern fill the space between adjacent lines closest to the character­istic element to thereby translate the superimposed line patterns into a field pattern of different optical densities.

1 citations

Proceedings ArticleDOI
15 Jan 1988
TL;DR: In this paper, a method for automatic measurement of the small tilt angle variation of an object surface by using a digital holographic moire interferometryI based on computer processing is described.
Abstract: A method for automatic measurement of the small tilt angle variation of an object surface by using a digital holographic moire interferometryI based on computer processing is described. The test surface is placed in the middle of a set of two gratings. A monochromatic plane wave illuminates the first grating and undergoes diffraction. After being reflected by the test surface, the first grating produces the magnified Talbot image. The moire fringe is generated by superimposing this Talbot image on the second grating. The inclination angle of the moire fringe is a measure of the tilt angle of the test surface. Fast and automatic measurement has been achieved with improved accuracy and sensitivity. In the experiment, the small tilt angle variation of the plane mirror is measured.

1 citations

DOI
14 Sep 1977
TL;DR: In this paper, an exact superposition of each pair of frames is obtained by comparing a reference speckle pattern registered in each frame with a standard, provided by an immobile auxiliary diffuser.
Abstract: One of the more widely used methods for the study of combustion phenomena is the deflexion-mapping method, in combination with Moire techniques. As combustion phenomena are essentially dynamic, multiple frames are generally needed to record the whole event. An exact superposition of each pair of frames may then be done, in order to deduce from the resulting Moire patterns, the change of the thermodynamic variables in the corresponding time interval. We present here a new technique by means of which the superposition of the pairs of frames can be done exactly. This superposition is obtained by comparing a reference speckle pattern registered in each frame with a standard. The reference speckle pattern is provided by an immobile auxiliary diffuser. After developing, a laser beam is directed through the reference region of the nearly superposed pairs of frames, and these are displaced one respect to the other until Young fringes disappear. This yields the criterion of correct superposition. A major advantage of this technique is that the filtering of the Moire patterns corresponding to each pair of frames, and the control of their correct superposition, are made simultaneously on the focal plane of a single lens in a simple optical setup.

1 citations

Journal ArticleDOI
TL;DR: In this article, the kinematics of moire fringes produced by moving line gratings relative to each other were studied and a method of determination of the instantaneous pole of relative rotation of the gratings was derived.
Abstract: A study of the kinematics of moire fringes produced by moving line gratings relative to each other provides an explanation for optical phenomena appearing during the motion. A method of determination of the instantaneous pole of relative rotation of the gratings is further derived.

1 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023181
2022321
202126
202048
201946
201844