Optical Fiber Sensor Network Integrating Communication and Sensing Functions Using Hetero-core Spliced Fiber Optic Sensors

2009 ◽  
Author(s):  
Nobutoshi Abe ◽  
Norihiko Shinomiya ◽  
Yoshimi Teshigawara
Keyword(s):  
Optical Fiber ◽  
Sensor Network ◽  
Fiber Optic ◽  
Optical Fiber Sensor ◽  
Fiber Optic Sensors ◽  
Fiber Sensor

Integrated Fiber Optic Sensors For Nondestructive Characterization Of Concrete Structures

1997 ◽  
Vol 503 ◽  
Author(s):  
F. Ansari
Keyword(s):  
Optical Fiber ◽  
Optical Fibers ◽  
Fiber Optic ◽  
Optical Fiber Sensor ◽  
Fiber Optic Sensors ◽  
Fiber Sensors ◽  
Fully Integrated ◽  
Integrated Optical ◽  
Concrete Elements

ABSTRACTIt is possible to monitor the initiation and progress of various mechanical or environmentally induced perturbations in concrete elements by way of fully integrated optical fiber sensors. Geometric adaptability and ease by which optical fibers can be embedded within concrete elements has led to the development of a number of innovative applications for concrete elements. This article is intended for a brief introduction into the theories, principles, and applications of fiber optic sensors as they pertain to applications in concrete.. However, due to the fact that the transduction mechanism in optical fibers is invariant of the materials employed, the principles introduced here also correspond to other structural materials. The only application related differences among various materials pertain to sensitivity and choice of optical fiber sensor types.

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

An Optical Fiber Sensor for Measuring Light Absorption in Suspension Solutions

2011 ◽  
Vol 121-126 ◽  
pp. 2509-2513
Author(s):  
Fei Bing Xiong ◽  
N Djeu ◽  
Wen Zhang Zhu
Keyword(s):  
Optical Fiber ◽  
Glassy Carbon ◽  
Fiber Optic ◽  
Optical Fiber Sensor ◽  
Fiber Optic Sensor ◽  
Fiber Sensor ◽  
Graphite Flake ◽  
Chemical Information ◽  
Carbon Particles ◽  
Optic Sensor

An optical fiber sensor based on attenuated total reflectance (ATR) for extraction chemical information from highly scattering turbid materials has been evaluated. The influence of particles on bulk absorption and ATR transmitted spectra of micron-sized graphite flakes and spherical glassy carbon suspensions were investigated. The ATR transmitted spectra of coiled fiber-optic sensor in those suspensions with various concentrations are insensitive to scattering of suspended particles, especially for graphite flake suspensions. The reason for different influence of graphite flakes and spherical glassy carbon particles suspensions on e ATR spectra analyzed. This study demonstrates that fiber-optic sensor based on ATR technique is a feasible technique in application for monitoring turbid suspensions.

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.

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