scholarly journals Bi-Dimensional Deflection Estimation by Embedded Fiber Bragg Gratings Sensors

Proceedings ◽  
2019 ◽  
Vol 15 (1) ◽  
pp. 3
Author(s):  
Palma ◽  
Palumbo ◽  
Pietra ◽  
Canale ◽  
Alviggi ◽  
...  
Keyword(s):  
Real Time ◽  
Fiber Bragg Gratings ◽  
Beam Theory ◽  
Bragg Gratings ◽  
Strain Sensors ◽  
Structural Monitoring ◽  
Direct Measure ◽  
Large Structure ◽  
Good Agreement ◽  
Classical Beam Theory

In this work, we present and discuss on the deflection estimation of a bi-dimensional panel by using Fiber Bragg Gratings (FBGs) as strain sensors embedded in the structure and a method based on the classical beam theory. The existing difficulties in the direct measure of the deflection are overcome thanks to the proposed technique and a real-time indirect structural monitoring is possible both on small and large structure. In many tests the estimated deflection with the proposed method has been compared with direct deflection measurements obtained with a mechanical comparator showing good agreement. A resolution of few tens of microns over a surface of the order of 1 m2 has been reached.

CGH-based real-time analysis of fiber Bragg gratings in few mode LMA fibers

2012 ◽  
Author(s):  
Markus Mundus ◽  
Jens U. Thomas ◽  
Christian Voigtländer ◽  
Ria G. Becker ◽  
Cesar Jauregui ◽  
...  
Keyword(s):  
Real Time ◽  
Fiber Bragg Gratings ◽  
Bragg Gratings ◽  
Time Analysis ◽  
Real Time Analysis

Characterization of Optical Fiber Bragg Gratings as Strain Sensors Considering Load Direction

2008 ◽  
Author(s):  
Michael C. Emmons ◽  
Sunny Karnani ◽  
K. P. Mohanchandra ◽  
Gregory P. Carman ◽  
Stefano Trono ◽  
...  
Keyword(s):  
Optical Fiber ◽  
Fiber Bragg Gratings ◽  
Bragg Gratings ◽  
Strain Sensors ◽  
Great Promise ◽  
Fiber Direction ◽  
Load Direction ◽  
Isotropic Composite ◽  
Loading Direction

This study investigates the influence of lay-up and load direction on embedded optical fiber Bragg gratings (FBGs) used as strain sensors. FBGs have shown great promise for application to structural health monitoring with advantages of small size and cylindrical geometry readily allowing for embedment within fiber reinforced composites. Characterization of the embedded FBGs is necessary to develop a rugged and reliable strain sensor. This paper specifically explores the effects of loading direction on the FBG strain outputs. A well behaved baseline case is established with results for gratings loaded parallel to the optical fiber direction while embedded parallel to the adjacent structural fibers in a quasi-isotropic composite. Results and analysis are also presented for a case involving a composite fabricated with the optical and structural fibers parallel to each other but perpendicular to the loading direction. Extremely good results are obtained relating FBG strain measurements with that of surface mounted resistance strain gauges.

All-optical real-time monitoring of air/vacuum valves in water pipeline systems using fiber Bragg gratings

2021 ◽  
Vol 44 (1) ◽  
Author(s):  
Genivaldo A. de Aquino ◽  
Yvone de F. L. De Lucca ◽  
Thiago D. Cabral ◽  
Pedro M. Lazari ◽  
André L. S. S. Martim ◽  
...  
Keyword(s):  
Real Time ◽  
Fiber Bragg Gratings ◽  
Bragg Gratings ◽  
Real Time Monitoring ◽  
All Optical ◽  
Pipeline Systems ◽  
Water Pipeline

scholarly journals Experimental Study on Glaze Icing Detection of 110 kV Composite Insulators Using Fiber Bragg Gratings

Sensors ◽  
2020 ◽  
Vol 20 (7) ◽  
pp. 1834
Author(s):  
Jie Wei ◽  
Yanpeng Hao ◽  
Yuan Fu ◽  
Lin Yang ◽  
Jiulin Gan ◽  
...  
Keyword(s):  
Transmission Lines ◽  
Temperature Compensation ◽  
Fiber Bragg Gratings ◽  
Polar Angle ◽  
Bragg Gratings ◽  
Strain Sensors ◽  
Power Grids ◽  
Wavelength Shift ◽  
Detection Technology ◽  
Load Characteristics

Icing detection of composite insulators is essential for the security and stability of power grids. As conventional methods have met difficulties in harsh weather, a 110 kV composite insulator with embedded Fiber Bragg Gratings (FBGs) was proposed for detecting glaze icing in this paper. FBG temperature compensation sensors in ceramic tubes were adopted for simultaneous measurement of icicle loads and temperature. Then, temperature calibration experiments and simulated icicle load experiments were carried out to obtain temperature and icicle load characteristics of FBGs. The results showed that temperature sensitivities of FBG strain sensors and FBG temperature compensation sensors were 18.16 pm/°C, and 13.18 pm/°C, respectively. Besides, wavelength shifts were linearly related to icicle loads within the polar angle range of −60° to 60°, and the load coefficient of FBG facing the icicle was -34.6 pm/N. In addition, the wavelength shift generated by several icicles was equal to the sum of wavelength shifts generated by each icicle within the polar angle range of −15° to 15°. Finally, icicles can cause wavelength shifts of FBGs within a big shed spacing. The paper provides a novel icing detection technology for composite insulators in transmission lines.

Fiber Bragg gratings-based sensing for real-time needle tracking during MR-guided brachytherapy

2016 ◽  
Vol 43 (10) ◽  
pp. 5288-5297 ◽  
Author(s):  
Maxence Borot de Battisti ◽  
Baudouin Denis de Senneville ◽  
Metha Maenhout ◽  
Jan J. W. Lagendijk ◽  
Marco van Vulpen ◽  
...  
Keyword(s):  
Real Time ◽  
Fiber Bragg Gratings ◽  
Bragg Gratings

Dynamic Temperature Compensating Interrogation Technique for Strain Sensors With Tilted Fiber Bragg Gratings

2008 ◽  
Vol 20 (16) ◽  
pp. 1393-1395 ◽  
Author(s):  
Yinping Miao ◽  
Bo Liu ◽  
Weihua Zhang ◽  
Bo Dong ◽  
Haibin Zhou ◽  
...  
Keyword(s):  
Fiber Bragg Gratings ◽  
Bragg Gratings ◽  
Strain Sensors ◽  
Dynamic Temperature ◽  
Interrogation Technique

scholarly journals Development of real‐time vibration measurement system by fiber Bragg gratings with pulse light

2020 ◽  
Vol 103 (11-12) ◽  
pp. 9-15
Author(s):  
Tatsuya Yamaguchi ◽  
Yamato Sugimoto ◽  
Yukitaka Shinoda
Keyword(s):  
Real Time ◽  
Measurement System ◽  
Fiber Bragg Gratings ◽  
Bragg Gratings ◽  
Vibration Measurement ◽  
Pulse Light
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