scholarly journals CYTOP Fibre Bragg Grating Sensors for Harsh Radiation Environments

Sensors ◽  
2019 ◽  
Vol 19 (13) ◽  
pp. 2853 ◽  
Author(s):  
Christian Broadway ◽  
Damien Kinet ◽  
Antreas Theodosiou ◽  
Kyriacos Kalli ◽  
Andrei Gusarov ◽  
...  
Keyword(s):  
Gamma Radiation ◽  
Nuclear Waste ◽  
Bragg Grating ◽  
Fibre Bragg Grating ◽  
Polymer Fibre ◽  
Bragg Wavelength ◽  
Total Radiation Dose ◽  
Fibre Bragg Grating Sensor ◽  
Bragg Grating Sensor ◽  
Waste Repositories

We present a polymer fibre Bragg grating sensor and its sensitivity to gamma radiation by observing the reflected spectral profile. The Bragg grating is femtosecond inscribed within a perfluorinated CYTOP fibre and the alteration of the Bragg wavelength corresponds to the total radiation dose received. Over a total dose of 41 k Gy, the fibre demonstrates a sensitivity of − 26.2 p m / k Gy and a resolution of 40 Gy. Under active consideration for the instrumentation of nuclear waste repositories, this study gives a better understanding of the effects of gamma radiation upon Bragg gratings in CYTOP fibres.

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.

Monitoring pressure profiles across an airfoil section with a fibre Bragg grating sensor array

2018 ◽  
Author(s):  
John W. Arkwright ◽  
Anthony W. Papageorgiou ◽  
Luke A. Parkinson ◽  
Andrew R. Karas ◽  
Kristy L. Hansen
Keyword(s):  
Sensor Array ◽  
Bragg Grating ◽  
Fibre Bragg Grating ◽  
Airfoil Section ◽  
Pressure Profiles ◽  
Fibre Bragg Grating Sensor ◽  
Bragg Grating Sensor

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.

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