Thermal mode of a resistance furnace for drawing optical fiber. I. Generalized mathematical model of the heating unit

1988 ◽  
Vol 54 (2) ◽  
pp. 176-182
Author(s):  
V. N. Vasil'ev ◽  
G. N. Dul'nev ◽  
V. D. Naumchik
Keyword(s):  
Mathematical Model ◽  
Optical Fiber ◽  
Thermal Mode ◽  
Resistance Furnace ◽  
Heating Unit

scholarly journals The Non-Stationary Thermal Mode for Barrier Building Constructions in Non-Symmetric Boundary Conditions

2018 ◽  
Vol 7 (3.2) ◽  
pp. 535
Author(s):  
Olena Borshch ◽  
Volodymyr Borshch ◽  
Dmytro Guzyk
Keyword(s):  
Heat Transfer ◽  
Thermal Conductivity ◽  
Mathematical Model ◽  
Boundary Conditions ◽  
Thermal Diffusion ◽  
Thermal State ◽  
Thermal Mode ◽  
Temperature Mode ◽  
Deep Layers

In barrier building constructions the heat transfer occurs both at the expense of thermal conductivity and as a result of liquid and air vapors resistance. The mechanism of such resistance differs from classical processes of diffusion and the laws of hydrodynamics for integral medium.The temperature mode of the surface and deep layers of barrier building constructions in non-symmetric boundary conditions was     analyzed. A mathematical model was developed that characterizes the change in the thermal state of barrier constructions during thermal diffusion. The method for calculating the non-stationary thermal modes of flat walls was presented.  

scholarly journals Features of a mathematical model of heat transfer in a vacuum resistance furnace

2017 ◽  
Vol 891 ◽  
pp. 012108 ◽  
Author(s):  
K. Yu. Litvintsev ◽  
K. A. Finnikov ◽  
E. B. Kharlamov
Keyword(s):  
Heat Transfer ◽  
Mathematical Model ◽  
Resistance Furnace

The Effect of the Broken Edge on the Concentricity of the Micro-Polished Optical Fiber End-Face

2013 ◽  
Vol 284-287 ◽  
pp. 2778-2783 ◽  
Author(s):  
Ying Chien Tsai ◽  
Guang Miao Huang ◽  
Jun Hong Chen ◽  
Shih Wei Chen
Keyword(s):  
Mathematical Model ◽  
Optical Fiber ◽  
Material Removal Rate ◽  
Tilt Angle ◽  
Material Removal ◽  
Removal Rate ◽  
Coupling Efficiency ◽  
Polishing Process ◽  
Laser Module ◽  
Micro Lens

The concentricity of the optical fiber micro lens affects the coupling efficiency of a laser module a lot. In this paper, the effect of the perpendicularity of the broken edge on the concentricity of the micro optical fiber end-face during the micro polishing process is studied. A mathematical model is derived to describe the variation of the material removal rate (MRR) when the tilt angles and amount of feed of the optical fiber are changed. An experiment is built to measure the concentricity of optical fiber with different tilt angles and feeds. The result shows that both of the dimensionless factor QAB and measured concentricity have the same tendency. The concentricity is better when the tilt angle is smaller and the amount of feed is larger. An improved polishing process is suggested. A good concentricity within 1μm can be achieved when fabricate the double-variable curvatures end-face of the optical fiber.

scholarly journals OPTIMIZATION OF THE PROCESS OF HEAT TREATMENT OF POROUS THERMAL INSULATING MATERIAL IN A VORTEX APPARATUS BY MECHANICAL PROPERTIES

2021 ◽  
Vol 2 (37) ◽  
pp. 55-58
Author(s):  
I. Sokolovska ◽  
K. Chumak
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Mathematical Model ◽  
Porous Material ◽  
Thermal Processing ◽  
Thermal Exposure ◽  
Thermal Mode ◽  
Insulating Materials ◽  
The Given ◽  
External Loads

The paper provides experimental data, on the basis of which the influence of various factors on the strength characteristics of porous heat-insulating materials was studied. A mathematical model of the process of heat treatment of a porous material was also proposed, with the help of which its properties can be predicted. The field of application of heat-insulating materials directly depends on the thermophysical and mechanical properties of the material itself, which are also interconnected. Mechanical properties determine the behavior of a material under deformation and destruction from external loads and under thermal stress. To reveal the influence of the characteristics of thermal processing modes on the mechanical properties of the processed material, a mathematical model of the process of thermal processing of a porous material was built in the given work. The elastic modulus and strength of the material were taken as process indicators characterizing the behavior of the material during deformation and destruction due to external loads, and the temperature of the thermal process, the time of thermal exposure, the moisture content of the material and the porosity of the material were taken as factors characterizing the thermal processing mode. The point forecast of indicators according to the received models for the given thermal mode of processing of porous material made: value of the modulus of elasticity is equal to 0,413, value of durability of material on compression is equal to 0,056. The work revealed that the main factor that determines the strength of the heat-insulating porous material is the duration of thermal exposure. It is obvious that it is this factor that determines the intensity of heat and mass transfer processes in the material, which is interconnected with the main technological indicator – the temperature of the external coolant. It was also noted that the thermodynamic parameters of steam are determined by the temperature and duration of thermal contact with the coolant. Thus, using the data obtained, it is possible to predict the properties of the porous material.

A Mathematical Model of a Non-uniform Micromechanical Deformation of an Optical Fiber Segment with an Axial Symmetric Surface Stressing

2019 ◽  
Vol 21 (6) ◽  
pp. 331-340
Author(s):  
I.L. Borysenkov ◽  
◽  
A.F. Fedechev ◽  
G.I. Leonovich ◽  
S.V. Kupriyanov ◽  
...  
Keyword(s):  
Mathematical Model ◽  
Optical Fiber ◽  
Fiber Segment ◽  
Symmetric Surface

De Algorithm Optimization Design Research and Numerical Simulation of a New Optical Fiber F-P Sensing System

2013 ◽  
Vol 710 ◽  
pp. 484-487
Author(s):  
Ning Shan ◽  
Tuan Jie Liu
Keyword(s):  
Numerical Simulation ◽  
Mathematical Model ◽  
Optical Fiber ◽  
Optimization Design ◽  
Design Research ◽  
Algorithm Optimization ◽  
Signal Attenuation ◽  
Practical Applications ◽  
Sensing System ◽  
De Algorithm

Optical fiber F-P sensor has several advantages, such as strong anti-interference ability, quick speed and high precision. It is widely applied in detecting fields. But optical fiber F-P sensor deviates from working point easily in practical applications, it leads to output signal attenuation and the decreasing of signal noise ratio. The double wavelength optical fiber F-P sensing system is designed to solve the problem. DE algorithm mathematical model of sensing system is established, meanwhile, a higher orthogonal precision sensing system is optimization designed. The orthogonal error of sensing system is studied. The results show that DE algorithm is correct and reliable. Its run time is shorter and the error is less than 10-3. The optimization objective decreases sharply. When the length of F-P cavity changes 0~2500nm, the orthogonal error of sensing system is less than 5%. It has higher stability and anti-interference ability. These results show that the DE algorithm can be used for the structural optimization design of optical fiber F-P sensor.

Mathematical model for the dynamics of an optical fiber viscometer

2006 ◽  
Author(s):  
Wei-Chih Wang ◽  
Joe Ho ◽  
Per G. Reinhall
Keyword(s):  
Mathematical Model ◽  
Optical Fiber
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