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A Study on the Security of Infrastructure using fiber Optic Scattering Sensors  

Kwon, Il-Bum (Center for Environment and Safety Measurement, Korea Research Institute of Standards & Science)
Yoon, Dong-Jin (Center for Environment and Safety Measurement, Korea Research Institute of Standards & Science)
Lee, Seung-Seok (Center for Environment and Safety Measurement, Korea Research Institute of Standards & Science)
Publication Information
Journal of the Korean Society for Nondestructive Testing / v.24, no.5, 2004 , pp. 499-507 More about this Journal
Abstract
We have studied tile detection techniques, which can determine the location and the weight of an intruder into infrastructure, by using fiber-optic ROTDR (Rayleigh optical time domain reflectometry) sensor and fiber-optic BOTDA (Brillouin Optical time domain analysis) sensor, which can use an optical fiber longer than that of ROTDR sensor Fiber-optic sensing plates of ROTDR sensor, which arc buried in sand, were prepared to respond the intruder effects. The signal of ROTDR was analyzed to confirm the detection performance. The constructed ROTDR could be used up to 10km at the pulse width of 30ns. The location error was less than 2 m and the weight could be detected as 4 grades, such as 20kgf, 40kgf, 60kgf and 80kgf. Also, fiber optic BOTDA sensor was developed to be able to detect intrusion effect through an optical fiber of tells of kilometers longer than ROTDR sensor. fiber-optic BOTDA sensor was constructed with 1 laser diode and 2 electro-optic modulators. The intrusion detection experiment was peformed by the strain inducing set-up installed on an optical table to simulate all intrusion effect. In the result of this experiment, the intrusion effort was well detected as the distance resolution of 3m through the fiber length of about 4.81km during 1.5 seconds.
Keywords
infrastructure; intrusion detection; buried sensing plates; fiber-optic ROTDR Sensor; fiber-optic BOTDA sensor;
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