Measuring frequency response of dispersion compensating fibre Bragg grating using Fourier coefficients

2005 ◽  
Vol 41 (7) ◽  
pp. 402 ◽  
Author(s):  
N. Cheng ◽  
D.J. Krause ◽  
J.C. Cartledge
Keyword(s):  
Frequency Response ◽  
Fourier Coefficients ◽  
Bragg Grating ◽  
Fibre Bragg Grating ◽  
Measuring Frequency

Amplification of fibre Bragg grating reflectivity by post-writing exposure with a 193 nm ArF laser

1994 ◽  
Vol 30 (14) ◽  
pp. 1133-1134 ◽  
Author(s):  
P. E. Dyer ◽  
K. C. Byron ◽  
R. J. Farley ◽  
R. Giedl
Keyword(s):  
Bragg Grating ◽  
Fibre Bragg Grating ◽  
Arf Laser ◽  
193 Nm

Microwave phase shifter based on fibre Bragg grating

1998 ◽  
Vol 34 (21) ◽  
pp. 2051 ◽  
Author(s):  
B. Ortega ◽  
J.L. Cruz ◽  
M.V. Andrés ◽  
A. Díez ◽  
D. Pastor ◽  
...  
Keyword(s):  
Phase Shifter ◽  
Bragg Grating ◽  
Fibre Bragg Grating ◽  
Microwave Phase Shifter

scholarly journals Photon-magnon response to fluid variability and saturation levels in sandstone reservoirs

2020 ◽  
Vol 17 (6) ◽  
pp. 1065-1074
Author(s):  
Abdullah Musa Ali ◽  
Amir Rostami ◽  
Noorhana Yahya
Keyword(s):  
Oil Recovery ◽  
Relative Permittivity ◽  
Wave Interaction ◽  
Heterogeneous Porous Media ◽  
Injection System ◽  
Bragg Grating ◽  
Fibre Bragg Grating ◽  
Core Flooding ◽  
Oil Saturation ◽  
Fluid Saturation

Abstract The need to recover high viscosity heavy oil from the residual phase of reservoirs has raised interest in the use of electromagnetics (EM) for enhanced oil recovery. However, the transformation of EM wave properties must be taken into consideration with respect to the dynamic interaction between fluid and solid phases. Consequently, this study discretises EM wave interaction with heterogeneous porous media (sandstones) under different fluid saturations (oil and water) to aid the monitoring of fluid mobility and activation of magnetic nanofluid in the reservoir. To achieve this aim, this study defined the various EM responses and signatures for brine and oil saturation and fluid saturation levels. A Nanofluid Electromagnetic Injection System (NES) was deployed for a fluid injection/core-flooding experiment. Inductance, resistance and capacitance (LRC) were recorded as the different fluids were injected into a 1.0-m long Berea core, starting from brine imbibition to oil saturation, brine flooding and eventually magnetite nanofluid flooding. The fluid mobility was monitored using a fibre Bragg grating sensor. The experimental measurements of the relative permittivity of the Berea sandstone core (with embedded detectors) saturated with brine, oil and magnetite nanofluid were given in the frequency band of 200 kHz. The behaviour of relative permittivity and attenuation of the EM wave was observed to be convolutedly dependent on the sandstone saturation history. The fibre Bragg Grating (FBG) sensor was able to detect the interaction of the Fe3O4 nanofluid with the magnetic field, which underpins the fluid mobility fundamentals that resulted in an anomalous response.

scholarly journals Fibre Bragg Grating Based Acoustic Emission Measurement System for Structural Health Monitoring Applications

Materials ◽  
2021 ◽  
Vol 14 (4) ◽  
pp. 897
Author(s):  
Sagar Jinachandran ◽  
Ginu Rajan
Keyword(s):  
Acoustic Emission ◽  
Structural Health Monitoring ◽  
Health Monitoring ◽  
Market Potential ◽  
Bragg Grating ◽  
Fibre Bragg Grating ◽  
Emission Measurement ◽  
Structural Health ◽  
Sensing Systems ◽  
Recent Trends

Fiber Bragg grating (FBG)-based acoustic emission (AE) detection and monitoring is considered as a potential and emerging technology for structural health monitoring (SHM) applications. In this paper, an overview of the FBG-based AE monitoring system is presented, and various technologies and methods used for FBG AE interrogation systems are reviewed and discussed. Various commercial FBG AE sensing systems, SHM applications of FBG AE monitoring, and market potential and recent trends are also discussed.

Calibration and operation of a fibre Bragg grating temperature sensing system in a grid-connected hydrogenerator

2013 ◽  
Vol 7 (1) ◽  
pp. 59-68 ◽  
Author(s):  
Marcelo Martins Werneck ◽  
Regina Célia da Silva Barros Allil ◽  
Bessie A. Ribeiro
Keyword(s):  
Temperature Sensing ◽  
Bragg Grating ◽  
Fibre Bragg Grating ◽  
Sensing System
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