TY - JOUR T1 - Border Protection Bragg Fiber Sensor TT - حسگر فیبر براگ مرزبانی JF - opsi JO - opsi VL - 23 IS - 0 UR - http://opsi.ir/article-1-1318-en.html Y1 - 2017 SP - 101 EP - 104 KW - Bragg Fiber KW - Border Protection KW - Loss KW - Optical Time Domain Reflectometry KW - Sensor N2 - In this paper a new method for intruder detection in border protection application using distributed Bragg fiber sensors is proposed. This method is based on exciting the acoustic modes of Bragg fiber under the influence of intruders' passing in borders. The changes in radial component of displacement vector of acoustic modes cause the thickness of Bragg fiber's claddings to change. As a result the quarter wave stack condition is violated and the light loss in place of intruder's passing is increase. By investigating the resulting trace of Optical Time Domain Reflectometry method in Bragg fiber, it is possible to determine the position of intruder's passing in borders. M3 ER -