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.

Some Investigations on the Methods of Measuring 3-Dimensional Plastic Deformations by Laser

Abstract: The moire method and the holographic interferometry, which are effective for the measurement of large and small deformations respectively, are developed. The moire method proposed in this paper is founded on the interference between the grating printed on a specimen and Young's interference fringes instead of the reference grating. If Young's interference fringes are projected on to the specimen from two directions, two components of the displacement are obtained. Measurement of an incremental deformation is also possible when some sensitizer is affixed to the specimen and Young's interference fringes are projected on to it two times during deformation. As for the holographic interferometry, Enno's method is improved so that two families of the interference fringes corresponding to two components of the displacement may be obtained on the congruent images to each other. Fundamental data are provided about these methods.

Method and device for removing moire patterns, and image display

Abstract: The invention discloses a method and a device for removing moire patterns, and an image display, which relate to the technical field of image processing, and aim to solve the problem of image distortion when the moire patterns in an image are removed. The method for removing the moire patterns comprises the following steps of: converting a first spatial domain image from a spatial domain to a frequency domain to obtain a first frequency domain image; determining frequency coordinates corresponding to a moire pattern in the first frequency domain image; filtering a frequency domain value at thefrequency coordinates corresponding to the moire pattern in the first frequency domain image to obtain a second frequency domain image; and converting the second frequency domain image from the frequency domain to the spatial domain to obtain a second spatial domain image. The method and the device for removing the moire patterns and the image display provided by the embodiment of the invention are used for image processing.

Augmented reality display system using modulated moiré imaging technique.

Abstract: To enhance the depth rendering ability of augmented reality (AR) display systems, a modulated moire imaging technique is used to render the true three-dimensional (3D) images for AR display systems. 3D images with continuous depth information and large depth of field are rendered and superimposed on the real scene. The proposed AR system consists of a modulated moire imaging subsystem and an optical combiner. The modulated moire imaging subsystem employs modulated point light sources, a display device, and a microlens array to generate 3D images. A defocussing equal period moire imaging structure is used, which gives a chance for the point light sources to modulate the depth position of 3D images continuously. The principles of the imaging system are deduced analytically. A custom-designed transparent off-axis spherical reflective lens is used as an optical combiner to project the 3D images into the real world. An experimental AR system that provides continuous 3D images with depth information ranging from 0.5 to 2.5 m is made to verify the feasibility of the proposed technique.

Moiré phonons in graphene/hexagonal boron nitride moiré superlattice

Abstract: We theoretically study the in-plane acoustic phonons of graphene/hexagonal boron nitride moir\'e superlattice using a continuum model. We demonstrate that the original phonon bands of individual layers are strongly hybridized and reconstructed into moir\'e phonon bands consisting of dispersive bands and flat bands. The phonon band structure can be effectively described by a spring-mass network model to simulate the motion of moir\'e domain walls where the flat-band modes are interpreted as vibrations of independent, decoupled strings. We also show that the moir\'e phonon has angular momentum due to the inversion symmetry breaking by hBN, with high amplitudes concentrated near the narrow gap region. Finally, we apply the same approach to twisted bilayer graphene and we find a notable difference between the origins of the flat-band modes in G/hBN and TBG, reflecting distinct geometric structures of the domain pattern.