Data processing in safety monitoring for earth embankment dams using fully distributed sensing along optical fibers

2009 ◽  
Author(s):  
A. H. Chen ◽  
H. Y. Zeng ◽  
P. Y. Zhu ◽  
Y. B. Leng
Keyword(s):  
Data Processing ◽  
Optical Fibers ◽  
Safety Monitoring ◽  
Distributed Sensing ◽  
Embankment Dams ◽  
Earth Embankment

scholarly journals Safety Inspection Strategy for Earth Embankment Dams using Fully Distributed Sensing

2011 ◽  
Vol 8 ◽  
pp. 520-526 ◽  
Author(s):  
Pingyu Zhu ◽  
Y.B. Leng ◽  
Y.Zhou ◽  
G.L. Jiang
Keyword(s):  
Distributed Sensing ◽  
Embankment Dams ◽  
Inspection Strategy ◽  
Earth Embankment

Simultaneous Calibration Method for Strain and Temperature of Distributed Sensing Optical Fibers

2014 ◽  
Vol 43 (12) ◽  
pp. 1206002 ◽  
Author(s):  
吕安强 Lv An-qianga ◽  
李永倩 LI Yong-qiana ◽  
李静 LI Jingb ◽  
陈永 CHEN Yonga
Keyword(s):  
Optical Fibers ◽  
Calibration Method ◽  
Distributed Sensing

Design of Mine Production Safety Monitoring System

2012 ◽  
Vol 503-504 ◽  
pp. 1330-1333
Author(s):  
Yan Kun Wang ◽  
Yun Xu Shi ◽  
Hong Mei Fan
Keyword(s):  
Data Processing ◽  
Monitoring System ◽  
Processing System ◽  
Safety Monitoring ◽  
Monitoring Data ◽  
Data Processing System ◽  
Network Systems ◽  
Safety Monitoring System ◽  
Monitoring Data Processing ◽  
And Control

The mine safety monitoring system is a set of sensor technology, electronics technology, power electronics technology, computer technology, wireless communication and network technology in one of China's leading multi-functional computer network systems, including underground, Inoue environment and equipment the detection of network systems and the Inoue monitoring data processing system. Environment and equipment for testing network system to achieve underground, of Inoue environment physical monitoring and control; monitoring data processing system is a comprehensive treatment of the collected data in order to achieve the sub-station set up and control equipment or detection sensors, through LAN detection information sharing, may constitute the enterprise information system.

scholarly journals Enhancement of the Performance and Data Processing Rate of an Optical Frequency Domain Reflectometer Distributed Sensing System Using A Limited Swept Wavelength Range

Sensors ◽  
2018 ◽  
Vol 18 (10) ◽  
pp. 3480 ◽  
Author(s):  
Kunpeng Feng ◽  
Jiwen Cui ◽  
Yihua Jin ◽  
Xun Sun ◽  
Dong Jiang ◽  
...  
Keyword(s):  
Data Processing ◽  
Frequency Domain ◽  
Spatial Resolution ◽  
Wavelength Range ◽  
Distributed Sensing ◽  
Optical Frequency ◽  
Local Similarity ◽  
Processing Rate ◽  
Spectrum Range ◽  
Measurable Range

A novel optical frequency domain reflectometer (OFDR) processing algorithm is proposed to enhance the measurable range and data processing rate using a narrow swept spectrum range and reducing the time consuming of the process distributed sensing results. To reduce the swept wavelength range and simultaneously enhance strain measurable range, the local similarity characteristics of Rayleigh scattering fingerprint spectrum is discovered and a new similarity evaluation function based on least-square method is built to improve the data processing rate and sensing performance. By this method, the strain measurable range is raised to 3000 µε under a highest spatial resolution of 3 mm when the swept spectrum range is only 10 nm and the data processing rate is improved by at least 10 times. Experimental results indicate that a nonlinearity of less than 0.5%, a strain resolution of better than 10 µε, a repeatability at zero strain of below ±0.4 GHz and a full-scale accuracy is lower than 0.85 GHz under a highest spatial resolution of 3 mm can be achieved. Advantages of this method are fast processing rate, large strain measurable range, high SNR, and applicability with current OFDR systems.

scholarly journals Tests under irradiation of optical fibers and cables devoted to corium monitoring in case of severe accident in a Nuclear Power Plant

2020 ◽  
Vol 225 ◽  
pp. 08006
Author(s):  
G. Cheymol ◽  
L. Maurin ◽  
L. Remy ◽  
V. Arounassalame ◽  
H. Maskrot ◽  
...  
Keyword(s):  
Optical Fiber ◽  
Optical Fibers ◽  
Nuclear Power ◽  
Carbon Coating ◽  
Hydrogen Diffusion ◽  
Coating Layer ◽  
Distributed Sensing ◽  
Severe Accident ◽  
Normal Operation ◽  
The Status

The DISCOMS project, which stands for “DIstributed Sensing for COrium Monitoring and Safety”, considers the potential of distributed sensing technologies, based on remote instrumentations and Optical Fiber Sensing cables embedded into the concrete floor under the reactor vessel, to monitor the status of this third barrier of confinement. This paper focuses on the selection and testing of singlemode (SM) optical fibers with limited RIA (Radiation Induced Attenuation) to be compliant with remote distributed instruments optical budgets, the ionizing radiation doses to sustain, and their reduction provided by the concrete basemat shielding. The tests aimed at exposing these fibers and the corresponding sensitive optical cables, to the irradiation doses expected during the normal operation of the reactor (up to 60 years for the European Pressurized Reactor), followed by a severe accident. Several gamma and mixed (neutron-gamma) irradiations were performed at CEA Saclay facilities: POSÉÏDON irradiator and ISIS reactor, up to a gamma cumulated dose of about 2 MGy and fast neutron fluence (E > 1 MeV) of 6 x 1015 n/cm2. The first gamma test permitted to assess the RIA at various optical wavelengths, and to select three radiation tolerant singlemode fibers (RIA < 5 dB/100 m, at 1550 nm operating wavelength). The second one was performed on voluminous strands of sensitive cables encapsulating the selected optical fibers, up to approximately the same accumulated dose, at two temperatures: 30°C and 80°C. A significant increase of the RIA, without any saturation tendency, appeared for fibers inserted into cables, correlated with the increase of the hydroxyl attenuation peak at 1380 nm. Molecular hydrogen generated by the radiolysis of compounds of the cable is at the origin of this phenomenon. A third gamma irradiation run permitted to measure the radiolytic hydrogen production yield of some compounds of a dedicated temperature cable sample. The efficiency of a carbon coating layer over the silica cladding, acting as a barrier against hydrogen diffusion, was also successfully confirmed. Finally, the efficiency of this carbon coating layer has also been tested under neutron irradiation, then qualified as a protection barrier against hydrogen diffusion in the optical fiber cores.

Novel optical fibers for Brillouin-based distributed sensing

2013 ◽  
Author(s):  
Peter D. Dragic ◽  
John Ballato ◽  
Stephanie Morris ◽  
Alex Evert ◽  
Robert R. Rice ◽  
...  
Keyword(s):  
Optical Fibers ◽  
Distributed Sensing
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