Improved High Dynamic Range for 3D Shape Measurement based on Saturation of the Coloured Fringe

Phase-shifting fringe projection methods have been developed for three-dimensional scanning (Zuo et al., 2018). However, the 3-Dimensional (3D) scanning of objects with a high dynamic reflectivity range based on structured light is a challenging task to achieve (Feng et al., 2018). The incorrect intensities captured will cause phase and measurement errors. Thus, this paper proposes a method that improves the current High Dynamic Range (HDR) (Jiang et al., 2016)) method to increase the dynamic range. The camera and projector have 3 channels, red, green, and blue, which can absorb and project these lights independently. This paper proposes a method that makes use of this by controlling the intensity of each projected for the camera. Each image can be split into 3 channels and provide 3 images which contain different intensities, then it will be used to compute the 3D information. In general, this is done by controlling the projection of red, green and blue (RGB) channel and apply the Jiang’s algorithm (Jiang et al., 2016). The results are compared and analysed with current HDR (Jiang’s method) and the regular three-step phase-shifting methods. From the experimental results, it has shown that our proposed method outperforms the current HDR and the regular three-step phase-shifting methods. Specifically, the proposed method manages to increase the dynamic range of the reflective property of objects. Additionally, our proposed method has also significantly reduced the times of 3D object measurements.

Universal Object Motions: Theory

Postulates governing universal object motion s are hypothesized. All o bjects display mass, geometry, andwavelengths (colors) determined either by their inherent properties of transmission or by their interactions withrays of different wavelengths. T h is paper proposes that RMs , which will be defined later, are the fundamentalcaus ation of motion in the UniverseThe motion of objects in theUniverse is governed by Newton 's laws of motion and laws of gravitation. Einstein’sspecial theory of relativity defines the motion of objects through relativistic frames and makes a bold hypothesisthat no object in the universe can surpass the speed of light. However, both, Newton’s and Einstein’s theoriessimply ignore the geometry of objects in defining the motion.This paper will explainho w the number of objects (defined here as RM), geometry of objects andemission/reflective property of objects are the fundamental cause for the origination of motion It is critical tounderstand how the number of objects, geometrical structure of objects and emission/reflective behaviour ofobjects can result in the occurrence of motion in the form of translational, rotational and revolution. When theproperties of objects such as geometry, light emission and the number of objects change, motion changes its forms.This paperis intended to be first of series of papers that will explain the nature of objects, their motion behavior s,and the fundamental nature of a Universe observed via the various object behavior s

Multifunctional graphene metasurface to generate and steer vortex waves

Graphene, an innovated 2D material with atomic thickness, is a very promising candidate and has drawn great attentions in various applications. Graphene metasurface enables dynamic control of various wavefronts, achieving distinguished functionalities. The flexibility of graphene metasurface makes it possible to implement multifunctional devices with ease. In this work, a novel design of multifunctional graphene metasurface, which can combine the functionalities of generating and steering vortex waves, has been proposed. The multifunctional graphene metasurface consists of a large array of graphene reflective unit cells. Each unit cell is controlled independently by its size and external static gate voltage. By scrutinizing the reflective property of the graphene cell, the graphene metasurface is designed to realize multi-functionalities. Simulation results show that vortex wave can be generated and steered. This work can establish a methodology to design multifunctional graphene metasurfaces, and the tunability of graphene opens the gate to the design and fabrication of reconfigurable graphene devices.

Robust anti-reflective silica nanocoatings: abrasion resistance enhanced via capillary condensation of APTES

Capillary condensation of APTES into silica anti-reflective coatings offers both excellent anti-reflective property and robust mechanical durability.

Facile Synthesis of Conical Arrays with Broadband Antireflective Property

Conical arrays of polydimethyl siloxane were fabricated by duplicating the morphology of needle tips. The prepared cones have periodic order and regular shape, with the bottom diameter of about 80 μm and height of about 250 μm. Due to their special structure, the conical arrays of polydimethyl siloxane exhibited broadband anti-reflective property. Compared with smooth surface, they could reduce the reflection of incident electromagnetic wave at ultraviolet, visible and near-infrared region. The specular reflectance was lower than 0.75% in the range of 250-2600 nm. The prepared PDMS cones have potential to be applied for antireflective devices. The method was simple for mass production of PDMS cones at low cost.