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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22 Sep 2022
Patent•
16 Aug 2019
TL;DR: In this paper, a stepping-free X-ray grating phase contrast imaging method is proposed to remove the phase stepping process and reduce the precision requirements for mechanical parts, and no extra cost is added, an object does not need to be subjected to mobile scanning and the requirements on the consistency of the Moire fringes are low.
Abstract: The invention discloses a stepping-free X-ray grating phase contrast imaging method. The method comprises the steps of 1) arranging an imaging system; 2) changing an angle of analyzing a grating or changing a period of self-imaging fringes of the phase grating, thereby enabling the plane of a detector to receive Moire fringes; 3) adjusting structural parameters of the imaging system to obtain a background displacement curve; 4) placing a sample at an object point, collecting fringe information received by the detector at the moment, and obtaining an object displacement curve; and 5) accordingto the obtained background displacement curve and object displacement curve, carrying out processing to obtain absorption, refraction and scattering information of the sample. Compared with a traditional X-ray grating phase contrast imaging method adopting phase stepping, the stepping-free X-ray grating phase contrast imaging method has the advantages that the phase stepping process is removed, sothat the phase contrast imaging speed is greatly increased, and the precision requirements for mechanical parts are reduced; and meanwhile, no extra cost is increased, an object does not need to be subjected to mobile scanning, and the requirements on the consistency of the Moire fringes are low. The stepping-free X-ray grating phase contrast imaging method is an effective supplement of the grating phase contrast imaging method.
17 Jul 1996
TL;DR: In this paper, an instrument to measure the convergence or divergence power of a wavefront using the fringes or software synchronous detection is described, which could be used to determine the dioptrical power of ophthalmic lenses.
Abstract: An instrument to measure the convergence or divergence power of a wavefront using
moire fringes or software synchronous detection is described. This instrument could be used to
measure the dioptrical power of ophthalmic lenses. The working principle could also be applied to
measure angles with high sensitivity.
Patent•
17 Jan 2019TL;DR: In this article, a crystal analyzer that can accurately detect a crystal strain or a crystal defect in a crystal was proposed, based on the correspondence relation between the pattern of the moire stripe of a moire image and the crystal defect.
Abstract: To provide a crystal analyzer that can accurately detect a crystal strain or a crystal defect in a crystal.SOLUTION: The crystal analyzer according to an embodiment includes: a first storage unit for storing a first image including a crystal lattice image in a crystal region of a sample including a crystal region; a first image processing unit for generating a moire image from the crystal lattice image; a second storage unit for storing at least one of the correspondence relation between the pattern of the moire stripe of a moire image and the crystal defect and the correspondence relation between the pattern of the moire stripe of the moire image and the crystal strain; and an analysis unit for analyzing the moire image generated from the crystal lattice image with reference to at least one of the correspondence relations and detecting at least one of the crystal defect and the crystal strain in the crystal region.SELECTED DRAWING: Figure 1
Patent•
14 Apr 2020
TL;DR: In this article, an interference phase shift sensitivity enhancing method based on moire fringes was proposed, which comprises the steps that an interference fringe light field formed by a spatial modulation type interferometer passes through a polaroid and then enters a common beam splitter prism.
Abstract: The invention discloses an interference phase shift sensitivity enhancing method based on moire fringes The method comprises the steps that an interference fringe light field formed by a spatial modulation type interferometer passes through a polaroid and then enters a common beam splitter prism, reflected light is reflected by a first plane mirror and then returns along an original light path, passes through the common beam splitter prism again and then enters an array detector through a polarization beam splitter prism, and a set of interference fringe distribution is formed; and transmission light is reflected twice in sequence, then enters the polarization beam splitting prism, and enters the array detector after being reflected, so that another group of interference fringe distribution with opposite fringe orientations is formed A third plane mirror is adjusted, so that an included angle is formed between two groups of interference fringes on the array detector, and moire fringes are formed When phase shift occurs to the interference fringes, obvious displacement occurs to the moire fringes The interference phase shift sensitivity enhancing method based on the moire fringes has universality and can effectively improve the measurement sensitivity of a spatial modulation type interference instrument