scholarly journals Fiber-Optic Bragg Gratings for Temperature and Pressure Measurements in Isotope Production Targets for Nuclear Medicine

2020 ◽  
Vol 10 (13) ◽  
pp. 4610
Author(s):  
Michael Bakaic ◽  
Matthew Hanna ◽  
Cyril Hnatovsky ◽  
Dan Grobnic ◽  
Stephen Mihailov ◽  
...  
Keyword(s):  
Nuclear Medicine ◽  
Fiber Bragg Grating ◽  
Fiber Optic ◽  
Bragg Grating ◽  
Pressure Measurements ◽  
Isotope Production ◽  
Fbg Sensor ◽  
Temperature And Pressure ◽  
Beam Currents ◽  
Production Target

A Bragg grating inscribed into an inorganic optical fiber was tested in proton and neutron fields up to doses of 472 Gy. Observation showed that radiation had no effect on the performance of the Fiber Bragg Grating (FBG) used as a gauge measuring temperature and pressure. The FBG sensor was subsequently employed to measure the temperature and pressure inside a liquid isotope production target for nuclear medicine. The fiber Bragg grating measured the temperature and pressure of a water target as a 12 MeV proton beam impinged on it in real time and was tested with beam currents of up to 20 µA.

Surveillance of fiber optic and electric power cables using fiber Bragg grating sensors

1999 ◽  
Author(s):  
Francisco M. Araujo ◽  
M. Teixeira ◽  
Luis A. A. Ferreira ◽  
Ireneu M. Dias ◽  
A. Quintela ◽  
...  
Keyword(s):  
Electric Power ◽  
Fiber Bragg Grating ◽  
Fiber Optic ◽  
Bragg Grating ◽  
Power Cables ◽  
Fiber Bragg Grating Sensors ◽  
Electric Power Cables

Investigation on Temperature Compensation of Fiber Bragg Grating Sensors for Hull Monitoring

2018 ◽  
Author(s):  
Ruiqi Ma ◽  
Guoqing Feng ◽  
Huilong Ren ◽  
Peng Fu ◽  
Shuang Wu ◽  
...  
Keyword(s):  
Thermal Expansion ◽  
Fiber Bragg Grating ◽  
Temperature Compensation ◽  
Compensation Method ◽  
Bragg Grating ◽  
Theoretical Derivation ◽  
Temperature Changes ◽  
Hull Girder ◽  
Fbg Sensor ◽  
Fbg Sensors

Hull monitoring system with Fiber Bragg Grating (FBG) sensors increasingly receives people’s attentions. However, for the ship hull monitoring, the deformation of hull girder changes a lot as is subjected to a huge temperature variation. Therefore, the compensation method with only FBG temperature self-correction is not suitable for the hull monitoring sensors because no material thermal expansion effects are reasonably included. In this paper, the new compensation method of hull monitoring FBG sensor based on the sensor theory with both FBG temperature self-correction and steel thermal expansion effects correction is studied. The coupled compensation method suitable for hull monitoring sensor is obtained by theoretical derivation. As the comparison, the coupled compensation experiment was carried out. The results show that the relative error under the temperature compensation method is large in the case of drastic strain and temperature changes, and the correction results of the tested method will be closer to the true level.

scholarly journals Fiber Optic Fabry-Perot Current Sensor Integrated with Magnetic Fluid Using a Fiber Bragg Grating Demodulation

Sensors ◽  
2015 ◽  
Vol 15 (7) ◽  
pp. 16632-16641 ◽  
Author(s):  
Ji Xia ◽  
Qi Wang ◽  
Xu Liu ◽  
Hong Luo
Keyword(s):  
Fiber Bragg Grating ◽  
Magnetic Fluid ◽  
Fiber Optic ◽  
Current Sensor ◽  
Bragg Grating ◽  
Fabry Perot

Fiber optic pressure sensor using a fiber Bragg grating

1998 ◽  
Author(s):  
Chuan S. Tjin ◽  
Jianzhong Hao ◽  
Rahul Malik
Keyword(s):  
Fiber Bragg Grating ◽  
Pressure Sensor ◽  
Fiber Optic ◽  
Bragg Grating

The Vibration Analysis of a Novel Vortex Flowmeter Based on Fiber Bragg Grating

2012 ◽  
Vol 485 ◽  
pp. 526-531 ◽  
Author(s):  
Hui Juan Dong ◽  
Yong Cai ◽  
Jun He ◽  
Ren Bing Liu
Keyword(s):  
Fiber Bragg Grating ◽  
Vibration Analysis ◽  
Axial Strain ◽  
Damping Ratio ◽  
Bragg Grating ◽  
Measuring Range ◽  
Fbg Sensor ◽  
Vortex Flowmeter ◽  
Acrylic Glass ◽  
Mass Spring

A novel fiber Bragg grating vortex flowmeter was designed in this work, where the Bragg grating was enfolded in a cylinder eddy generator. Bragg grating subject to force and the corresponding strain were analyzed. Subsequently, the relationships between grating’s axial strain and flow were developed. In order to improve the flowmeter's resolution, the system was simplified by a mass-spring-damper model, which was used to analyze resonance and choose acrylic glass as cylinder's material. In terms of the resolution of FBG sensor demodulation device and factors of vortex's formation, the measuring range of flowmeter is 1200L/h~5000L/h. The resolution is less than 40L/h with flow exceeding 2000L/h. The damping ratio is not sensitive to the flow when it is less than 2000L/h.

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