scholarly journals A Review of Recent Results on Simultaneous Interrogation of Multiple Fiber Bragg Grating-Based Sensors Using Microwave Photonics

2019 ◽  
Vol 9 (2) ◽  
pp. 298 ◽  
Author(s):  
Lawrence R. Chen ◽  
Maria-Iulia Comanici ◽  
Parisa Moslemi ◽  
Jingjing Hu ◽  
Peter Kung
Keyword(s):  
Fiber Bragg Grating ◽  
High Speed ◽  
Large Scale ◽  
Microwave Photonics ◽  
Pulse Generation ◽  
Bragg Grating ◽  
Correlation Peak ◽  
Fabry Perot ◽  
Fbg Sensors ◽  
Power Mapping

We review recent results on exploiting microwave photonics to enable simultaneous interrogation of multiple fiber Bragg grating (FBG)-based sensors. In particular, we describe the use of (1) microwave photonic filtering and (2) chirped microwave pulse generation and compression as a means to map the wavelength (spectral) changes in the response of FBG-based sensors (specifically, an in-fiber Fabry-Pérot cavity sensor based on FBGs, FBG sensors directly, and a linearly chirped FBG sensor) to applied temperature (or strain) to the power of a radio-frequency signal (i.e., a wavelength-to-power mapping) or to the correlation peak of the compressed microwave signal. The approaches support high-resolution and high-speed interrogation and can be suitable for large scale sensing networks.

scholarly journals High-Speed Interrogation for Large-Scale Fiber Bragg Grating Sensing

Sensors ◽  
2018 ◽  
Vol 18 (3) ◽  
pp. 665 ◽  
Author(s):  
Chenyuan Hu ◽  
Wei Bai
Keyword(s):  
Fiber Bragg Grating ◽  
High Speed ◽  
Large Scale ◽  
Bragg Grating

scholarly journals Real Time Monitoring of Railway Traffic Using Fiber Bragg Grating Sensors

2010 ◽  
Author(s):  
M. L. Filograno ◽  
A. Rodri´guez-Barrios ◽  
M. Gonza´lez-Herraez ◽  
P. Corredera ◽  
S. Marti´n-Lo´pez ◽  
...  
Keyword(s):  
Fiber Bragg Grating ◽  
High Speed ◽  
Field Tests ◽  
Bragg Grating ◽  
Railway Traffic ◽  
Fbg Sensor ◽  
Commercial Operation ◽  
Load Calculation ◽  
Different Types ◽  
Fbg Sensors

In this work we present field tests concerning the application of Fiber Bragg Grating (FBG) sensors for the monitoring of railway traffic. The test campaigns are performed on the Spanish high speed line Madrid–Barcelona, with different types of trains (S-102 TALGO–BOMBARDIER, S-103 SIEMENS-VELARO and S-120 CAF). We located the FBG sensors in the rail track at 70 km from Madrid in the country side, where the trains primarily are tested during commercial operation with maximum speeds between 250–300 km/h. The FBG sensor interrogation system used allows the simultaneous monitoring of four FBG sensors at 8000 samples/s. The different position of the FBG sensors in relation with the rail can be used with different purposes such as train identification, axle counting, speed and acceleration detection, wheel imperfections monitoring and dynamic load calculation.

Simultaneous Measurement of Deformation and Fracture of Composite Structures Using Fiber Bragg Grating Sensors

2011 ◽  
Author(s):  
Hong-Il Kim ◽  
Jae-Hung Han ◽  
Hyung-Joon Bang ◽  
Soo-Hyun Kim ◽  
Bongwan Lee
Keyword(s):  
Fiber Bragg Grating ◽  
Simultaneous Measurement ◽  
Composite Structures ◽  
High Speed ◽  
Bragg Grating ◽  
Structural Failure ◽  
Aerodynamic Forces ◽  
Structural Shape ◽  
Deformation And Fracture ◽  
Fbg Sensors

Because of high specific strength and many other benefits, the use of composites for the large lightweight structures such as modern aircrafts and wind turbines are increasing. However, one of the serious drawbacks of composites is that the structural failure occurs in complex patterns without yielding. Therefore, structural health monitoring has been intensively investigated for the early detection of any problems in structural integrity. One of the promising sensors for this purpose is fiber Bragg grating (FBG) sensor. They can be easily inserted into the layered-structure of the composite materials due to their small size. The excellent multiplexing capability enables measurement to be taken at multiple points along a single sensor line. As well as damage detection, the structural shape measurement also draws attention. Particularly for structures experiencing aerodynamic forces such as wind turbines or helicopter blades, the structural shape itself is important because the applied aerodynamic forces are affected by structural shape deflections. Therefore, the authors have conducted a series of studies on the structural shape estimation of various structures. We have also developed a wavelength division multiplexing (WDM) Bragg grating sensing system for high speed strain sensing as well as low frequency dynamic strains. In the case of high-speed sensing, the interrogator allows a sampling ratio of over 40 kHz for six linearly arrayed FBG sensors per channel. Utilizing the developed interrogator, this paper presents some experimental results for simultaneous measurement of deformation and fracture signals of composite structures. An array of FBG sensors were installed onto composite beam specimens and the acoustic emission (AE) signals due to structural failure was continuously monitored while the overall structural deflection shape was monitored in real time. The reconstructed shapes of the specimens were in good agreement with the shapes captured from photographs taken with a high-speed camera. In summary, it was demonstrated that both fracture signals and the overall deformation shape of composite structures could be simultaneously monitored.

Simulation study of signal gain optimization based on hybrid composition techniques for high-speed optically dense multiplexed systems

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Mahmoud M. A. Eid ◽  
Ahmed Nabih Zaki Rashed ◽  
Shimaa El-Meadawy ◽  
Kawsar Ahmed
Keyword(s):  
Fiber Bragg Grating ◽  
Wavelength Division Multiplexing ◽  
High Speed ◽  
Glass Composition ◽  
Optical Amplifier ◽  
Bragg Grating ◽  
Modified Model ◽  
Signal Gain ◽  
Raman Amplifier ◽  
Fabry Perot

AbstractThis study created a 13 Gb/s transmission speed per 300 channel dense wavelength division multiplexing system based on hybrid optical fiber amplifiers and filter techniques to enhance signal gain. The filter techniques used here included a hybrid optical amplifier, a gain flattening filter (GFF), a Fabry–Perot filter, a fiber Bragg grating (FBG), and glass composition technique. The techniques were combined to optimize signal gain as follows: the study began with an erbium-doped fiber amplifier (EDFA), added a Raman amplifier, added GFF, added fiber Bragg grating, added glass composition, and finally achieved a hybrid-modified model after adding Fabry–Perot filter. The signal gain was optimized with the hybrid-modified model via the different operating parameters of the EDFA. The proposed model also showed a better performance (30–40 dB greater) than the previous model (Mahran O, Aly MH. Performance characteristics of dual-pumped hybrid EDFA/Raman optical amplifier. OSA – Applied Optics Jan 2016;55:22–6) after changing the values of the signal wavelength, the EDFA, and the length of the Raman amplifier.

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