Journal
PHOTONIC SENSORS
Volume 5, Issue 1, Pages 19-23Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s13320-014-0203-2
Keywords
Passive net; rockfall hazard; fiber Bragg grating; disaster alarm strategy; tunnel portal
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Funding
- National Engineering Laboratory for Fiber Optic Sensing Technology, Wuhan University of Technology, China
- Fundamental Research Funds for the Central Universities [WUT: 2014-IV-090]
- National Natural Science Foundation of China (Major Program) [61290310]
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In order to realize working state remote monitoring for a passive net, alarm timely and correctly for the rockfall invasion, and solve the disadvantages in the existing means, such as needing power supply in situ, vulnerability to electromagnetic interference and environmental climate impact, a smart passive net structure based on the optical fiber sensing technology was designed which equipped with intercepting and sensing functions. The wire rope net as one part of the smart passive net was weaved with two kinds of optical fiber sensing elements, namely, fiber Bragg grating (FBG) perimeter severity sensors and optical fiber monitoring net with each end of the tail fiber containing an FBG probe. Based on the proposed smart structure, a combination alarm strategy for rockfall was proposed, which can distinguish transmission bug, whether the rockfall invasion or net broken occurs. Through a designed simulation test, the effectiveness of the proposed alarm strategy was certificated.
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