scholarly journals Numerical and Experimental Performance Analysis of the Chirped Fiber Bragg Grating Based Abrasion Sensor for the Maintenance Applications in the Industry 4.0

Sensors ◽  
2020 ◽  
Vol 20 (3) ◽  
pp. 770
Author(s):  
Konrad Markowski ◽  
Kacper Wojakowski ◽  
Ernest Pokropek ◽  
Michał Marzęcki
Keyword(s):  
Fiber Bragg Grating ◽  
Fiber Optics ◽  
Cost Effective ◽  
Bragg Grating ◽  
Coupled Mode Theory ◽  
Spectral Position ◽  
Experimental Performance ◽  
Coupled Mode ◽  
Extensive Analysis ◽  
Chirped Fiber Bragg Grating

In this article, an extensive analysis of the performance of the fiber optics-based abrasion sensor that utilizes chirped fiber Bragg grating, is presented. For the response investigation during abrasion, a numerical analysis, based on the transfer matrix method and coupled mode theory, is provided. The influence of the SLED source spectral position in respect to the spectral position of the chirped fiber Bragg grating is evaluated together with the influence of the changes of the ambient temperature of the sensor. Experimental verification of the sensor’s performance is provided, together with the proposition of the packaging of the sensor. In the article, a simple, cost-effective and multiplexation-ready concept of the wear or abrasion sensor system is presented and discussed.

scholarly journals Phase-modified coupled mode theory for calculation of fiber Bragg grating Fabry-Perot cavity transmission spectrum

2008 ◽  
Vol 57 (10) ◽  
pp. 6393
Author(s):  
Wang Yan-Hua ◽  
Ren Wen-Hua ◽  
Liu Yan ◽  
Tan Zhong-Wei ◽  
Jian Shui-Sheng
Keyword(s):  
Fiber Bragg Grating ◽  
Transmission Spectrum ◽  
Bragg Grating ◽  
Coupled Mode Theory ◽  
Mode Theory ◽  
Coupled Mode ◽  
Cavity Transmission ◽  
Fabry Perot

scholarly journals Comparison of Fabry – Perot Filter of Fiber Bragg Grating for Visible and Ultraviolet Spectra

2016 ◽  
Vol 1 (1) ◽  
Author(s):  
Didik Puji Sutriyono
Keyword(s):  
Visible Light ◽  
Fiber Bragg Grating ◽  
Transfer Matrix Method ◽  
Matrix Method ◽  
Laser Source ◽  
Bragg Grating ◽  
Coupled Mode Theory ◽  
Coupled Mode ◽  
Ultraviolet Spectra ◽  
Fabry Perot

<p>The use of Fiber Bragg Grating (FBG) as Fabry – Perot filter has been successfully developed for visible light and ultraviolet spectra. The characteristic of FBG is analyzed by using computational model with Transfer Matrix Method by order 2 with the coupled mode theory. The reflectivity, length of grating and bandwidth are parameters to determine the performance of FGB with laser source of 1 mW for 250 – 350 nm, ultraviolet and 380 – 780 nm, visible light. The simulation is also carried out by various grating from 0.5 cm – 9.5 cm with increment step of 1 cm. The simulation result showed that there is the filter discrepancy for maximum peak. This design of FGB can be used as a filter. Only selected wavelength is allowed to transmit the signal until the end of the optical fiber.</p>

scholarly journals Comparison of Fabry – Perot Filter of Fiber Bragg Grating for Visible and Ultraviolet Spectra

2016 ◽  
Vol 1 ◽  
Author(s):  
Didik Puji Sutriyono
Keyword(s):  
Visible Light ◽  
Fiber Bragg Grating ◽  
Transfer Matrix Method ◽  
Matrix Method ◽  
Laser Source ◽  
Bragg Grating ◽  
Coupled Mode Theory ◽  
Coupled Mode ◽  
Ultraviolet Spectra ◽  
Fabry Perot

<p>The use of Fiber Bragg Grating (FBG) as Fabry – Perot filter has been successfully developed for visible light and ultraviolet spectra. The characteristic of FBG is analyzed by using computational model with Transfer Matrix Method by order 2 with the coupled mode theory. The reflectivity, length of grating and bandwidth are parameters to determine the performance of FGB with laser source of 1 mW for 250 – 350 nm, ultraviolet and 380 – 780 nm, visible light. The simulation is also carried out by various grating from 0.5 cm – 9.5 cm with increment step of 1 cm. The simulation result showed that there is the filter discrepancy for maximum peak. This design of FGB can be used as a filter. Only selected wavelength is allowed to transmit the signal until the end of the optical fiber.</p>

A Prototype of Fiber Bragg Grating Dendrometric Sensor for Monitoring the Growth of the Diameter of Trees in the Amazon

2020 ◽  
Vol 17 (11) ◽  
pp. 4841-4848
Author(s):  
Lelis Araujo de Oliveira ◽  
Jackson Moreira Oliveira ◽  
Fabio Barros de Sousa ◽  
Fiterlinge Martins de Sousa ◽  
Jorge Everaldo de Oliveira ◽  
...  
Keyword(s):  
Climate Change ◽  
Fiber Bragg Grating ◽  
Transfer Matrix Method ◽  
Fiber Optic ◽  
Bragg Grating ◽  
Coupled Mode Theory ◽  
Bragg Wavelength ◽  
Coupled Mode ◽  
Fbg Sensors ◽  
Point Dendrometer

In this work, we propose a fiber optic point dendrometer with two Fiber Bragg Grating (FBG) sensors capable of simultaneously measuring strain and temperature considered suitable for monitoring the growth of the diameter of trees in the Amazon compared to conventional electrical sensors and we perform a simulation on the performance of the sensors for measuring the diameter using the Coupled Mode Theory (CMT) and the Transfer Matrix Method (TMM). A measure of the diameter variation was suggested and the sensitivity of the sensors were analyzed from the measurements of the displacements of the Bragg wavelengths varying simultaneously the strain and the temperature. The results showed that the proposed configuration, thermally varied from 0 °C to 80 °C and deformed from 0 to 2400 μ could specifically detect minute variations in diameters with a resolution of 0.5 μm (0.0005 mm) with good linearity staying with a variation of the Bragg wavelength 0.12 nm for each 10 °C and 0.24 nm for each 200 μ. The feasibility of using this type of configuration of FBG sensors for strain and temperature measurements in the monitoring of forest, forestry, climate change and irrigation areas in the Amazon is very promising.

Analytical Model Analysis of Reflection/Transmission Characteristics of Long-Period Fiber Bragg Grating (LPFBG) by Using Coupled Mode Theory

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Iraj Sadegh Amiri ◽  
Ahmed Nabih Zaki Rashed ◽  
P. Yupapin
Keyword(s):  
Fiber Bragg Grating ◽  
Transmission Coefficient ◽  
Analytical Model ◽  
Bragg Grating ◽  
Coupled Mode Theory ◽  
Transmission Characteristics ◽  
Mode Theory ◽  
Coupled Mode ◽  
Long Period ◽  
Operating Wavelength

AbstractThis study presents an analytical model analysis of reflection/transmission characteristics of long-period fiber Bragg grating (LPFBG) by using coupled mode theory. Reflected signal power is deeply studied against grating length at the optimum operating signal wavelength of 1550 nm for the proposed and previous models. Reflectivity and transmission coefficient are also clarified versus operating wavelength for the previous model and proposed a model with a central wavelength of 1550 nm, Δn = 0.003 and optimum grating length of 30 mm. In the same way, the reflectivity and transmission coefficient are outlined against relative refractive grating difference step at the optimum wavelength of 1550 nm and optimum grating length of 30 mm. The optimum LPFBG can be achieved with the optimum grating length of 30 mm, operating wavelength of 1550 nm and relative refractive grating difference step of 0.3 %.

scholarly journals Experimental Strain Measurement Approach Using Fiber Bragg Grating Sensors for Monitoring of Railway Switches and Crossings

Sensors ◽  
2021 ◽  
Vol 21 (11) ◽  
pp. 3639
Author(s):  
Abdelfateh Kerrouche ◽  
Taoufik Najeh ◽  
Pablo Jaen-Sola
Keyword(s):  
Fiber Bragg Grating ◽  
Experimental Tests ◽  
Cost Effective ◽  
Measuring Method ◽  
Bragg Grating ◽  
Railway Network ◽  
System Failures ◽  
Railway Infrastructure ◽  
Train Speed ◽  
And Control

Railway infrastructure plays a major role in providing the most cost-effective way to transport freight and passengers. The increase in train speed, traffic growth, heavier axles, and harsh environments make railway assets susceptible to degradation and failure. Railway switches and crossings (S&C) are a key element in any railway network, providing flexible traffic for trains to switch between tracks (through or turnout direction). S&C systems have complex structures, with many components, such as crossing parts, frogs, switchblades, and point machines. Many technologies (e.g., electrical, mechanical, and electronic devices) are used to operate and control S&C. These S&C systems are subject to failures and malfunctions that can cause delays, traffic disruptions, and even deadly accidents. Suitable field-based monitoring techniques to deal with fault detection in railway S&C systems are sought after. Wear is the major cause of S&C system failures. A novel measuring method to monitor excessive wear on the frog, as part of S&C, based on fiber Bragg grating (FBG) optical fiber sensors, is discussed in this paper. The developed solution is based on FBG sensors measuring the strain profile of the frog of S&C to determine wear size. A numerical model of a 3D prototype was developed through the finite element method, to define loading testing conditions, as well as for comparison with experimental tests. The sensors were examined under periodic and controlled loading tests. Results of this pilot study, based on simulation and laboratory tests, have shown a correlation for the static load. It was shown that the results of the experimental and the numerical studies were in good agreement.

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