The use of optical fiber for the creation of security systems for electrical cables of distribution networks of 0.4 kV

Abstract The article presents the results of research aimed at solving important production issues related to the theft of power cables and reducing the reliability of electrical networks with a voltage of 0.4 kV. To implement the security system, a single-mode optical fiber and a hardware and software complex for data processing were used. The results of the work can be used in security systems for various purposes, including telecommunications and construction systems. During the experiments, it was found that the photoelasticity effect occurs during mechanical action on the optical fiber, which causes changes in the refractive indices of the shell and core, while the properties of light change. In contrast to the known security systems and methods of fixing violations, a high-resolution television matrix is used, and not a photodetector device that records only changes in intensity. The television matrix is installed at the output of the optical fiber and records all changes in the light spot, and the hardware and software complex converts these changes into numerical values.

Download Full-text

Questions of application of fiber-optic sensors for monitoring crack growth during rock deformations

Journal of Physics Conference Series ◽

10.1088/1742-6596/2140/1/012037 ◽

2021 ◽

Vol 2140 (1) ◽

pp. 012037

Author(s):

V V Yugay ◽

P Sh Madi ◽

S B Ozhigina ◽

D A Gorokhov ◽

A D Alkina

Keyword(s):

Optical Fiber ◽

Fiber Optic ◽

Single Mode ◽

Mechanical Action ◽

Fiber Optic Sensors ◽

Fiber Optic Sensor ◽

Mountain Range ◽

Mining Equipment ◽

Optic Sensor ◽

Rock Deformations

Abstract The paper considers ways to solve the problem of developing a system for monitoring displacement in quarries, which are the main main cause of the collapse of boards and berms in quarries. To ensure safety and constant monitoring during work at the quarry, there are chiseled fiber-optic sensors. The fiber-optic sensor is made on the basis of a single-mode optical fiber, which makes it possible to measure the displacements of the mountain range at distances of about 30 km with high accuracy. Laboratory sample a fiber-optic sensor in its work uses a method for monitoring additional losses that occur during mechanical action on an optical fiber. The fiber-optic sensor was made to show a fairly high linearity and accuracy during measurements and can be used to control the deformation of the array after appropriate refinement of its design. This article is aimed at creating means of controlling the process of deformation and displacement of a mountain massif. Ultimately, the results of the study will help prevent accidents associated with the collapse of the sides. Since the growth of cracks in the rocks of the bort mountain massif leads to its sudden collapse and creates a significant danger for personnel, it also causes the failure of mining equipment.

Download Full-text

OPTICAL FIBER LOSS ANALYSIS FOR AN APPLICATION OF SPECTROPHOTOMETER SYSTEM

Jurnal Teknologi ◽

10.11113/jt.v79.10612 ◽

2017 ◽

Vol 79 (5) ◽

Author(s):

Nurfatihah Che Abd Rashid ◽

Nor Hafizah Ngajikin ◽

Khairunnisa Mohd Yusof ◽

Suhaila Isaak ◽

Asrul Izam Azmi ◽

...

Keyword(s):

Optical Fiber ◽

Fiber Type ◽

Light Emitting Diode ◽

Single Mode ◽

Single Mode Fiber ◽

Silicon Photodiode ◽

Light Emitting ◽

Loss Analysis ◽

System A ◽

Bending Diameter

Loss analysis due to the insertion of optical fiber in short wavelength spectrophotometer system is experimentally conducted to improve resolution and flexibility of the system design. In this paper, type, length and bending diameter of the optical fiber are analyzed as a preliminary work towards the development of a low-loss spectrophotometer system. In order to analyze a suitable type of fiber to be adopted in this system, a 20 mm length and 0 mm bending diameter of a single-mode fiber (SMF), multi-mode fiber (MMF) and Polymethyl methacrylate (PMMA) fiber are tested. The length and bending diameter of the suitable fiber is then varied from 20 mm to 60 mm and 6 mm to 22 mm respectively. In this paper, light emitting diode (LED) centered at 525 nm wavelength with 35 nm full width half maximum (FWHM) is used as the spectrophotometer light source while silicon photodiode is used as the detector. In this work, photodetector output voltage is recorded to analyze the loss contributed by these three parameters. At this particular wavelength, PMMA is found to be a suitable fiber to be adopted due to its minimal loss performance. Besides the fiber type, having a minimal fiber length with maximal fiber bending diameter can reduce loss due to the insertion of optical fiber in spectrophotometer system, hence improving the spectrophotometer resolution performance.

Download Full-text