A Cost-Effective Optical Fiber Sensor Network Exploiting Brillouin Beat Frequency Shift

2013 ◽  
Author(s):  
Siyadong Xiong ◽  
Chenglong Liu ◽  
Chao Peng ◽  
Zhengbin Li
Keyword(s):  
Optical Fiber ◽  
Frequency Shift ◽  
Sensor Network ◽  
Beat Frequency ◽  
Optical Fiber Sensor ◽  
Cost Effective ◽  
Fiber Sensor

scholarly journals Measurement Improvement of Distributed Optical Fiber Sensor via Lorenz Local Single Peak Fitting Algorithm

Symmetry ◽  
2021 ◽  
Vol 13 (7) ◽  
pp. 1166
Author(s):  
Bin Liu ◽  
Jianping He ◽  
Shihai Zhang ◽  
Yinping Zhang ◽  
Jianan Yu ◽  
...  
Keyword(s):  
Optical Fiber ◽  
Frequency Shift ◽  
Optical Fiber Sensor ◽  
Gain Spectrum ◽  
Fiber Sensor ◽  
Peak Fitting ◽  
Fitting Algorithm ◽  
Distributed Optical Fiber Sensor ◽  
Brillouin Gain ◽  
Distributed Optical Fiber

Brillouin frequency shift (BFS) of distributed optical fiber sensor is extracted from the Brillouin gain spectrum (BGS), which is often characterized by Lorenz type. However, in the case of complex stress and optical fiber self damage, the BGS will deviate from Lorenz type and be asymmetric, which leads to the extraction error of BFS. In order to enhance the extraction accuracy of BFS, the Lorenz local single peak fitting algorithm was developed to fit the Brillouin gain spectrum curve, which can make the BSG symmetrical with respect to the Brillouin center frequency shift. One temperature test of a fiber-reinforced polymer (FRP) packaged sensor whose BSG curve is asymmetric was conducted to verify the idea. The results show that the local region curve of BSG processed by the developed algorithm has good symmetry, and the temperature measurement accuracy obtained by the developed algorithm is higher than that directly measured by demodulation equipment. Comparison with the reference temperature, the relative measurement error measured by the developed algorithm and BOTDA are within 4% and 8%, respectively.

A Temperature Optical Fiber Sensor Network: From Laboratory Feasibility To Field Trial

1992 ◽  
Author(s):  
H. Fevrier ◽  
J. Hervo ◽  
S. Artigaud ◽  
A. Tardy ◽  
M. Jurczyszyn ◽  
...  
Keyword(s):  
Optical Fiber ◽  
Sensor Network ◽  
Field Trial ◽  
Optical Fiber Sensor ◽  
Fiber Sensor

scholarly journals Long-Reach DWDM-Passive Optical Fiber Sensor Network for Water Level Monitoring of Spent Fuel Pool in Nuclear Power Plant

Sensors ◽  
2020 ◽  
Vol 20 (15) ◽  
pp. 4218 ◽  
Author(s):  
Hoon-Keun Lee ◽  
Jaeyul Choo ◽  
Gangsig Shin ◽  
Joonyoung Kim
Keyword(s):  
Optical Fiber ◽  
Water Level ◽  
Sensor Network ◽  
Nuclear Power ◽  
Safety Information ◽  
Optical Fiber Sensor ◽  
Water Levels ◽  
Fiber Sensor ◽  
Spent Fuel ◽  
Spent Fuel Pool

This paper presents a passive optical fiber sensor network based on the dense wavelength division multiplexing (DWDM) to remotely monitor the water level of the spent fuel pool in nuclear power plants. In states of emergency, such as a tsunami, safety information must be secured for rapid response, in spite of all power losses in the plant. We consider the proposed passive sensor network to be one of the best solutions that is able to provide the remote (more than tens of kilometers) monitoring station with the highly reliable on-site information. The principle of water level measurement is based on the change of Fresnel reflection power coefficient at sensing units, which are installed according to the water levels in a row. The sensing units that play the role of reflector and modulator at the same time are connected to an arrayed waveguide grating (AWG) for DWDM. By measuring the spectrum of the optical signal transferred from the sensing units, the water level can be determined in real-time. However, in the remote sensing, the system performance can be seriously degraded due to the Rayleigh Back-Scattering (RBS) of the seeded amplified spontaneous emission (ASE) light that is induced at the fiber-optic link. As such, we investigate the effect of RBS on the remote (more than tens of kilometers) sensing performance of the proposed network. Following the theoretical analysis, we propose a simple network configuration to overcome the RBS issue by utilizing two different transmission paths: one for downstream of the ASE seed light, and the other for upstream of the optical signals coming from the sensing units. Based on the proposed configuration, the maximum sensing distance can be increased up to 42.5 km without the support of any optical amplifier.

Sign in / Sign up

Export Citation Format

Share Document