Closed-circuit television arc guidance adapter kit for a computerized welding skate, phase 1

Closed circuit TV guidance adapter kit designed to integrate with computerized welding skat

A Step-by-step Guide to the Realisation of Advanced Optical Tweezers

Since the pioneering work of Arthur Ashkin, optical tweezers have become an indispensable tool for contactless manipulation of micro- and nanoparticles. Nowadays optical tweezers are employed in a myriad of applications demonstrating the importance of these tools. While the basic principle of optical tweezers is the use of a strongly focused laser beam to trap and manipulate particles, ever more complex experimental set-ups are required in order to perform novel and challenging experiments. With this article, we provide a detailed step- by-step guide for the construction of advanced optical manipulation systems. First, we explain how to build a single-beam optical tweezers on a home-made microscope and how to calibrate it. Improving on this design, we realize a holographic optical tweezers, which can manipulate independently multiple particles and generate more sophisticated wavefronts such as Laguerre-Gaussian beams. Finally, we explain how to implement a speckle optical tweezers, which permit one to employ random speckle light fields for deterministic optical manipulation.Comment: 29 pages, 7 figure

Side-emitting fibers: targeted light scattering in optical fibers

Light scattering in optical fibers can transform the fiber into a linear light source with customizable emission properties: a side-emitting fiber. Side-emitting fibers are light sources with special angular and longitudinal emission characteristics, not generally encountered in other light sources: they emit radiation in all directions like a diffuse light source, but the emission is preferentially directed forward. Also, the fiber’s surface emission may decrease exponentially or vary along the fiber. The contribution of this dissertation to the literature on side-emitting fibers is twofold; first, it will show how these fiber emission parameters will influence the generated light field in the proximity and the far field. Second, it will show how to customize the emission properties by using femtosecond laser-generated scattering centers: Arranging these building blocks can generate customized longitudinal emission profiles. Furthermore, it will derive an electromagnetic model of the scattering behavior of these modifications to show how their stochastic properties, shape, and volume affect the angular emission profile and their scattering power

Glowing felt textile

We demonstrate a new technology-a combination of side glowing (or side emitting) plastic optical fibers with seamless felting technology-that addresses the challenges of smart textiles related to cutting and stitching together with the ability to be washed. The technology was explored for the development of a collection of dresses called "Deep Sea Life" that exhibit versatile designs and styles and so can advance modern fashion design

Systems and Methods for Providing Compact Illumination in Head Mounted Displays

Disclosed are systems and methods for providing illumination in a head mounted display. In one embodiment a method includes emitting light from a plurality of sources at a plurality of wavelengths and transmitting the light from the plurality of sources to a first device. The method further includes combining the light, utilizing the first device, from the plurality of sources into a combined light signal and creating telecentricity in the combined light signal. The method also includes receiving a telecentric light signal on a display surface. In one embodiment the system includes a light source, a hybrid reflective structure configured as a truncated pyramid and further configured to transmit light emitted by the light source and an optics device configured to create telecentricity in light that was transmitted through the hybrid reflective structure to a display surface

Reusable photocatalytic optical fibers for underground, deep-sea, and turbid water remediation

An approach for underground, deep, and turbid water remediation is presented based on optical fibers with a photocatalytic coating. Thus, photocatalytic TiO2 P25 nanoparticles immobilized in a poly(vinylidene difluoride) (PVDF) matrix are coated on polymeric optical fibers (POFs) and the photocatalytic performance of the system is assessed under artificial sunlight. To the best of our knowledge, poly(methyl methacrylate)-POF coated with TiO2/PVDF and the reusability of any type of POF for photocatalytic applications are not previously reported. The photocatalytic efficiency of the hybrid material in the degradation of ciprofloxacin (CIP) and its reusability are evaluated here. It is shown that 50 w/w% of TiO2 P25 achieves a degradation of 95% after 72 h under artificial sunlight and a reusability of three times leads to a loss of activity inferior to 11%. The efficient removal of ciprofloxacin and the stability of the POF coated with TiO2 P25 successfully demonstrate its suitability in the degradation of pollutants with potential application in regions with low light illumination, as in underground and deep water.Peer ReviewedPostprint (published version