Enhancement of absolute measurement range of in-fibre Bragg grating sensors with interferometric wavelength-shift detection

1996 ◽  
Author(s):  
Y. J. Rao
Keyword(s):  
Absolute Measurement ◽  
Measurement Range ◽  
Bragg Grating ◽  
Wavelength Shift ◽  
Fibre Bragg Grating ◽  
Shift Detection

SENSITIVITY MEASUREMENT OF FIBRE BRAGG GRATING SENSOR

2016 ◽  
Vol 78 (3) ◽  
Author(s):  
Suzairi Daud ◽  
Muhammad Safwan Abd Aziz ◽  
Kashif Tufail Chaudhary ◽  
Mahdi Bahadoran ◽  
Jalil Ali
Keyword(s):  
Tunable Laser ◽  
Sensor System ◽  
Laser Source ◽  
Bragg Grating ◽  
Wavelength Shift ◽  
Fibre Bragg Grating ◽  
Sensor Head ◽  
Fibre Bragg Grating Sensor ◽  
Pass Through ◽  
Bragg Grating Sensor

A practical pass-through type fibre Bragg grating (FBG) temperature sensor system have been designed, developed, simulated, and experimentally investigated. The performance of FBG was evaluated in harsh environments exposed under direct sunlight, rain, and wind. The sensor system designed directly focused with convex and hand lens. The temperature of FBG’s sensor head been measured. The broadband laser source was launched into the system using tunable laser source (TLS) and both transmission and reflection spectra of FBG sensor were measured by optical spectrum analyzer (OSA). Results shows that the Bragg wavelength shift,  increased proportionally with the temperature changes. The sensitivity of FBG were recorded at 0.0100 and 0.0132 nm °C-1 for the systems where convex and hand lens applied to the FBG’s sensor head respectively, while the sensitivity of 0.0118 nm °C-1 measured for the system without any focusing element applied.

scholarly journals Azobenzene-Based Gel Coated Fibre Bragg Grating Sensor for Moisture Measurement

2016 ◽  
Vol 2016 ◽  
pp. 1-7 ◽  
Author(s):  
Mohammed Moniruzzaman ◽  
John Rock
Keyword(s):  
Low Cost ◽  
Bragg Grating ◽  
Wavelength Shift ◽  
Fibre Bragg Grating ◽  
Polymer Gel ◽  
Nondestructive Measurement ◽  
Moisture Sensor ◽  
Water Ingress ◽  
Fibre Bragg Grating Sensor ◽  
Bragg Grating Sensor

A fibre Bragg grating sensor is coated with a novel polymer gel in order to investigate its suitability for nondestructive measurement of moisture in materials that can potentially lose their integrity due to moisture ingress. Absorption and desorption of moisture lead to swelling/shrinkage of an azobenzene-based gel, which induces a strain in the Bragg grating resulting in wavelength shifts. The results demonstrated that the amount of wavelength shift is linearly dependent on the amount of water ingress by the gel. The performance of the proposed optical fibre moisture sensor was found to be repeatable with no detectable hysteresis and has the potential to offer a low-cost route for monitoring moisture content.

Dual-cavity interferometric wavelength-shift detection for in-fiber Bragg grating sensors

1996 ◽  
Vol 21 (19) ◽  
pp. 1556 ◽  
Author(s):  
Y. J. Rao ◽  
L. Zhang ◽  
I. Bennion ◽  
D. A. Jackson
Keyword(s):  
Fiber Bragg Grating ◽  
Bragg Grating ◽  
Wavelength Shift ◽  
Fiber Bragg Grating Sensors ◽  
Shift Detection

Time-and-spatial-multiplexing tree topology for fiber-optic Bragg-grating sensors with interferometric wavelength-shift detection

1996 ◽  
Vol 35 (13) ◽  
pp. 2267 ◽  
Author(s):  
A. B. Lobo Ribeiro ◽  
Y. J. Rao ◽  
L. Zhang ◽  
I. Bennion ◽  
D. A. Jackson
Keyword(s):  
Fiber Optic ◽  
Spatial Multiplexing ◽  
Tree Topology ◽  
Bragg Grating ◽  
Wavelength Shift ◽  
Shift Detection

Wavelength Shift Detection Methods Based on Cross-Correlation Analysis for Signal Demodulation of Fiber Bragg Grating Sensing System

2012 ◽  
Vol 239-240 ◽  
pp. 156-162
Author(s):  
Fan Yang ◽  
Biao Wei
Keyword(s):  
Correlation Analysis ◽  
Fiber Bragg Grating ◽  
Cross Correlation ◽  
Absolute Error ◽  
Bragg Grating ◽  
Wavelength Shift ◽  
Sensing System ◽  
Cross Correlation Analysis ◽  
Signal Demodulation ◽  
Shift Detection

In order to improve the signal demodulation performance of fiber Bragg grating (FBG) sensing system, a wavelength shift detection method based on cross-correlation analysis is proposed to improve the accuracy of the measurement. The simulation results indicate that the absolute error of the measurement can be between 2 pm - 3 pm within the range of SNR of 14 dB-7 dB. Under the condition with high SNR, the absolute error can be approximately reduced to 0.5 pm. Hence, this demodulation algorithm can reduce the influences of the noises effectively and help to further study the features of the FBG sensor demodulation system.

Real-time monitoring of a variable-camber aileron rib by original strain-angle transducer

2015 ◽  
Vol 28 (8) ◽  
pp. 1023-1035 ◽  
Author(s):  
Gianluca Amendola ◽  
Monica Ciminello ◽  
Ignazio Dimino ◽  
Salvatore Ameduri
Keyword(s):  
Conceptual Design ◽  
Metal Plate ◽  
Rigid Bodies ◽  
Design Parameters ◽  
Bragg Grating ◽  
Wavelength Shift ◽  
Original Strain ◽  
Fibre Bragg Grating ◽  
Angular Rotation ◽  
Post Buckling

The object of this work is the conceptual design and modelling of a transducer based on fibre optic sensor and conceived to measure rotations of rigid components around a pivot. The device, namely, post-buckling-fibre Bragg grating, is constituted of a flexible metal plate hosting a fibre Bragg grating strain sensor; the edges of the plates are hinged onto the rotating rigid bodies, eccentrically with respect to the pivot. In this way, any increase in rotation produces a further bending of the plate corresponding to a fibre Bragg grating wavelength shift. Among the different applications, an aileron morphing architecture is considered. This architecture is composed of a rib made of three rigid parts, hinged each other and moved through a dedicated kinematic chain. Two post-buckling-fibre Bragg grating devices are installed between the adjacent rib blocks giving a measure of their current angular rotation. A peculiarity of the proposed device is its ability in working in post-buckling configuration, with two main advantages: (1) easy, plug-and-play, installation (the device supporting plate can be manually bent and plugged within the connection hinges) and (2) tuning of the sensitivity or range of measure, on the basis of the fibre Bragg grating location onto the plate and of the initial post-buckling level. At first, the conceptual design was dealt with a theoretical model describing the post-buckling behaviour of beams, highlighting the effect of the main design parameters; then, the plate displacement field was related to rotation angle of the rib; a dedicated numerical (finite element) model was thus realized to prove the concept feasibility and simulate in detail its functionality. Finally, experimental set-up was provided in order to validate the design.

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