A novel method for inverse fiber Bragg grating structure design

Pressure pipelines have been applied widely in the chemical industry, the petroleum enterprises and the electrical power plants. Leakage and explosion accidents happened frequently owing to the weakness of the pressure pipeline. To monitoring the pressure pipeline weakness, a novel method is presented by using optical FBG (FBG: Fiber Bragg Grating) sensors to carry on the real-time monitoring of the pressure piping surface strains. A typical pressure pipeline was fabricated with weak position of L shaped, Tee shaped and U shaped joints. The strains of the weak position were analyzed by the ANSYS software, and then the same weak positions were monitored by experimental method of FBG sensor. The FBG sensor was verified a feasible means to monitoring the pressure pipeline by comparing the ANSYS software results with the experimental results of FBG sensors.

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Whole-Span and Whole Length Pre-Stress Loss Monitoring Technique Study in Bonded Pre-Stressed System

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.188.144 ◽

2012 ◽

Vol 188 ◽

pp. 144-149

Author(s):

Ji Bin Zhang ◽

Song Tao Lin ◽

Juan Gao

Keyword(s):

Fiber Bragg Grating ◽

Bragg Grating ◽

Optic Fiber ◽

Electromagnetic Environment ◽

Monitoring Technique ◽

Steel Strand ◽

Margin Of Safety ◽

Novel Method

The load of pre-stress structure comes from stretching of steel strand, but the stress built on the steel strand would be lost. The lost causes many problems on the structure, such as pre-stress uneven and margin of safety reduced. Monitoring stress lever on the steel strand can provide information of the structure, and then expert can estimate the behavior under load of structure. It is hardly to monitor the whole-span and whole length of steel strand by traditional senses and method, because of measure range, protection and interference of electromagnetic environment. A novel method based on Optic Fiber Bragg Grating (OFBG), which mentioned in the article, provides a successful experience on the monitoring of pre-stress loss in whole-span and whole length.

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Fiber Bragg grating based displacement sensors: state of the art and trends

Sensor Review ◽

10.1108/sr-06-2017-0116 ◽

2019 ◽

Vol 39 (1) ◽

pp. 87-98 ◽

Cited By ~ 5

Author(s):

Wenlong Liu ◽

Yongxing Guo ◽

Li Xiong ◽

Yi Kuang

Keyword(s):

Fiber Bragg Grating ◽

Composite Structures ◽

Structure Design ◽

Bragg Grating ◽

Content Type ◽

Displacement Sensors ◽

Special Fibers ◽

Beam Type ◽

Information Detection ◽

Wavelength Detection

Purpose The purpose of this paper is to present the latest sensing structure designs and principles of information detection of fiber Bragg grating (FBG) displacement sensors. Research advance and the future work in this field have been described, with the background that displacement and deformation measurements are universal and crucial for structural health monitoring. Design/methodology/approach This paper analyzes and summarizes the existing FBG displacement sensing technologies from two aspects principle of information detection (wavelength detection, spectral bandwidth detection, light intensity detection, among others) and principle of the sensing elastomer structure design (cantilever beam type, spring type, elastic ring type and other composite structures). Findings The current research on developing FBG displacement sensors is mainly focused on the sensing method, the construction and design of the elastic structure and the design of new information detection method. The authors hypothesize that the following research trends will be strengthened in future: temperature compensation technology for FBG displacement sensors based on wavelength detection; a study of more diverse elastic structures; and fiber gratings manufactured with special fibers will greatly improve the performance of sensors. Originality/value The latest sensing structure designs and principles of information detection of FBG displacement sensors have been proposed, which could provide important reference for research group.

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A novel fiber Bragg grating structure for multiparameter sensing with enhanced strain sensitivity

10.1063/1.4810732 ◽

2013 ◽

Author(s):

Pathi Munendhar ◽

Shaival Buch ◽

R. Aneesh ◽

Sunil K Khijwania

Keyword(s):

Fiber Bragg Grating ◽

Bragg Grating ◽

Strain Sensitivity ◽

Grating Structure ◽

Enhanced Strain

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A High Temperature Solid Pressure Sensor Based on Fiber Bragg Grating

Symmetry ◽

10.3390/sym13112098 ◽

2021 ◽

Vol 13 (11) ◽

pp. 2098

Author(s):

Hongying Guo ◽

Jiang Chen ◽

Zhumei Tian ◽

Aizhen Wang

Keyword(s):

High Temperature ◽

Fiber Bragg Grating ◽

High Temperatures ◽

Pressure Sensor ◽

Structural Model ◽

Structural Parameters ◽

Structure Design ◽

Bragg Grating ◽

Circular Membrane ◽

Sensor Structure

For the requirement of pressure detection in high temperature environments, this paper presents a fiber Bragg grating (FBG) based pressure sensor with a simple structure. The structural model of the sensor has been established with the consideration of a sensing principle and a small deflection effect of the circular membrane. The finite element analysis has been employed to validate the rationality of the sensor structure design and realize the digital simulation of the theoretical model. Through the analysis, the selection of packaging materials, the design of structural parameters and the pressure and temperature calibration of the developed sensor has been performed. The encapsulation of the sensor at high temperatures has been improved based on the theoretical analysis, simulation and testing, which proves the effectiveness of the sensor for pressure measurement at high temperatures of 100 °C~250 °C. The study provides a feasible sensing device for high-temperature pressure detection.

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A Novel Method of Switch Machine Gap Monitoring Based on Fiber Bragg Grating

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.209-211.2121 ◽

2012 ◽

Vol 209-211 ◽

pp. 2121-2126 ◽

Cited By ~ 1

Author(s):

Lei Zhang ◽

De Cun Dong ◽

Jun Ting Lin ◽

Zhi Peng Yuan ◽

Jie Yi Mao

Keyword(s):

Mathematical Model ◽

Fiber Bragg Grating ◽

Bragg Grating ◽

Monitoring Technology ◽

Monitoring Techniques ◽

Machine Maintenance ◽

Operational Safety ◽

Working Principle ◽

Novel Method ◽

Gap Data

The switch machine gap monitoring technology is the main technology to detect the turnout’s service status and ensure the operational safety. This paper deduces a mathematical model of the gap monitoring on the basis of the analysis of the gap monitoring techniques and the working principle of the switch machine. It uses the Fiber Bragg Grating technology to extract and analyze the gap data. The results show that the use of Fiber Bragg Grating could get a more accurate monitoring of the gap, and provide a more reliable support for the switch machine maintenance at the same time.

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