Hollow light guide and optical fiber for UV laser transmission

1998 ◽  
Author(s):  
Uichi Kubo ◽  
Yuichi Hashishin ◽  
Hitoshi Nakano ◽  
Hiroyuki Tanaka
Keyword(s):  
Optical Fiber ◽  
Light Guide ◽  
Uv Laser

Development of Laser Dresser for Resin Bonded Diamond Wheel

2007 ◽  
Vol 329 ◽  
pp. 169-174 ◽  
Author(s):  
Hiroshi Matsuura ◽  
Kazuhiro Hane ◽  
Yasuhiro Kunieda ◽  
Nobuhito Yoshihara ◽  
Ji Wang Yan ◽  
...  
Keyword(s):  
Optical Fiber ◽  
Laser Light ◽  
Laser Energy ◽  
Uv Light ◽  
Mechanical Damage ◽  
Diamond Wheel ◽  
The State ◽  
Uv Laser ◽  
Wheel Surface ◽  
Core Diameter

The state of the wheel surface after dressing is important for processing of a surface to the nano-order level. A laser dresser was developed using ultraviolet (UV) laser light, which imparts no mechanical damage to the resin bond. One feature of this system is that UV laser energy is transmitted by a special optical fiber for UV light, and is transmitted only to the resin bond. Using this newly developed laser dresser, it was possible to ablate the resin bond to a depth of over 2 microns using a fiber with a core diameter of 200 microns.

Damage threshold of acrylic polymer jackets surrounded with optical fiber by UV laser

2006 ◽  
Author(s):  
Yoshinari Maezono ◽  
Iwasa Yousuke ◽  
Kou Kurosawa ◽  
Masahito Katto ◽  
Atsushi Yokotani
Keyword(s):  
Optical Fiber ◽  
Damage Threshold ◽  
Uv Laser ◽  
Acrylic Polymer

A simple and inexpensive modulated light calorimeter using an optical fiber light guide

1998 ◽  
Vol 69 (5) ◽  
pp. 2045-2049 ◽  
Author(s):  
N. J. Garfield ◽  
M. A. Howson ◽  
N. Overend
Keyword(s):  
Optical Fiber ◽  
Light Guide ◽  
Fiber Light Guide ◽  
Modulated Light

Silicon-containing polyimides: synthesis, properties, and application as optical fiber light guide coatings

2020 ◽  
Vol 69 (8) ◽  
pp. 1486-1491
Author(s):  
D. A. Sapozhnikov ◽  
A. V. Chuchalov ◽  
B. A. Bayminov ◽  
P. A. Shibaeva ◽  
E. M. Chaika ◽  
...  
Keyword(s):  
Optical Fiber ◽  
Light Guide ◽  
Fiber Light Guide ◽  
Synthesis Properties

Modelling and Experimental Investigation of Luminous Coupling in UVLED Driven Optical Fiber Reactors

2020 ◽  
Vol 1 (1) ◽  
pp. 50-60
Author(s):  
Johannes Robert ◽  
Thomas Jüstel ◽  
Roland Ulber ◽  
Volkmar Jordan
Keyword(s):  
Optical Fiber ◽  
Photocatalytic Oxidation ◽  
Light Guide ◽  
Light Transmission ◽  
Waste Water Treatment ◽  
Sol Gel ◽  
Radiant Flux ◽  
Hydroxyl Ion ◽  
Light Guides ◽  
Reflective Surfaces

Background: Photocatalytic oxidation is a promising tool for waste water treatment and decomposition of biologically non digestible substances. Immersed nanoscale catalyst particles from semiconductor materials such as TiO2 and ZnO can be excited by absorbed UV radiation, leading to hydroxyl-ion formation at the surface of the semiconductor and oxidative degradation of pollutants. Objective: This contribution deals with reactors equipped with catalyst coated light guides to combine the advantages of immobilized catalysts with nearly homogeneous irradiation. With experimental and theoretical methods the coupling and decoupling of radiation were investigated and the performance of catalyst coated light guides was tested by means of methylene-blue degradation. Methods: Radiation models, known from the recent literature, use single ray, parallel ray or multi ray models to approximate the light transmission. These models neglect Fresnel reflection and consider only coupling into the light guide. In this study, the LED was simulated as a Lambertian radiator using 10 4 rays with angle dependent intensities. This well-known model was extended with Fresnelreflection, which predicted the measured coupling efficiencies accurately. The simulations predict the decoupling and catalyst activation at the lateral surface of the light guide for two boundary cases, ideal matt and ideal reflective surfaces. To generate matt surfaces, the light guides were either scratched or coated with TiO2 p25 nanopowder. Sol-gel coating methods were used, to create reflective surfaces. Results: When using matt surfaces, the decoupling rate is very high: 80% of the radiant flux exits the light guide in less than 10 cm. If light guides with reflective surfaces are used, the radiant flux leaving the light guide is low: less than 10% of the radiation exited the light conductor in the first 10 cm. Methyleneblue degradation, seen as a model reaction, was used to determine the reactor performance by comparing the pseudo first order reaction coefficients. Due to the uniform light distribution along the length of the light guides and the resulting even formation of reactive radicals, the quantum yield was increased by a factor of 3, using sol-gel coated light guides, rather than powder coated light guides. Conclusion: The effectiveness of LED driven optical fiber reactors was intensified, if reflective surfaces are used instead of matt surfaces. These surfaces are achieved by sol gel chemistry. However, to use the complete amount of photons, which entered the optical fiber, very long light guides are needed.

scholarly journals Polymer optical fiber Bragg grating inscription with a single UV laser pulse

2017 ◽  
Vol 25 (8) ◽  
pp. 9028 ◽  
Author(s):  
A. Pospori ◽  
C. A. F. Marques ◽  
O. Bang ◽  
D. J. Webb ◽  
P. André
Keyword(s):  
Laser Pulse ◽  
Optical Fiber ◽  
Fiber Bragg Grating ◽  
Bragg Grating ◽  
Uv Laser ◽  
Polymer Optical Fiber ◽  
Optical Fiber Bragg Grating

scholarly journals Dynamic Measurements of Tank Wall Deformations as a New Method for Assessing its Technical Condition

2021 ◽  
Vol 2096 (1) ◽  
pp. 012026
Author(s):  
E Sh Gaysin ◽  
A R Valeev ◽  
R R Tashbulatov
Keyword(s):  
Optical Fiber ◽  
Light Guide ◽  
Fatigue Cracks ◽  
Technical Condition ◽  
Luminous Flux ◽  
New Approach ◽  
Steel Tank ◽  
Cycle Loading ◽  
The Difference ◽  
Number Of Cycles

Abstract The paper proposes a new approach to assessing the residual resource of the wall of a vertical steel tank by the criterion of low-cycle loading, taking into account its actual deformations. The method is based on the principle of measuring the difference in the power of the luminous flux at the ends of the light tube (light guide) when it is bent. An experiment was carried out using an optical pair (LED and photodiode) and an optical fiber. For this purpose, templates with known radii of curvature were prepared, a prototype of an Arduino-based device was developed and an optical fiber was manufactured, which was subsequently fixed on the wall of a two-hundred-liter metal barrel. As a result of the experiments, a formula was obtained for determining the curvature of the wall depending on the readings of the sensor. The sensitivity of the proposed method is estimated. An algorithm for determining the number of cycles before the formation of fatigue cracks is proposed, taking into account the actual values of the wall deflection.

Sign in / Sign up

Export Citation Format

Share Document