A novel multi-channel distributed optical fiber intrusion monitoring system with smart fiber link backup and on-line fault diagnosis functions was proposed. A 1 ~ N optical switch was intelligently controlled by a per...A novel multi-channel distributed optical fiber intrusion monitoring system with smart fiber link backup and on-line fault diagnosis functions was proposed. A 1 ~ N optical switch was intelligently controlled by a peripheral interface controller （PIC） to expand the fiber link from one channel to several ones to lower the cost of the long or ultra-long distance intrusion monitoring system and also to strengthen the intelligent monitoring link backup function. At the same time, a sliding window auto-correlation method was presented to identify and locate the broken or fault point of the cable. The experimental results showed that the proposed multi-channel system performed well especially whenever any a broken cable was detected. It could locate the broken or fault point by itself accurately and switch to its backup sensing link immediately to ensure the security system to operate stably without a minute idling. And it was successfully applied in a field test for security monitoring of the 220-km-length national borderline in China.展开更多
基金The authors gratefully acknowledge the previous supports provided by the National High Technology Research and Development Program of China （863 Program, Grant No. 2007AA01Z245）, and the supports provided for this research by the Major Program （Grant No. 61290312） and Youth Foundation （Grant No. 61301275） of the National Science Foundation of China （NSFC）, and the Fundamental Research Funds for the Central Universities （Grant No. ZYGX2011 J010）. This work is also supported by Program for Changjiang Scholars and Innovative Research Team inUniversity （PCSIRT, IRTI218）, and the 111 Project （B14039）. Open Access This article is distributed under the terms of the Creative Commons Attribution License which permits any use, distribution, and reproduction in any medium, provided the original author（s） and source are credited.
文摘A novel multi-channel distributed optical fiber intrusion monitoring system with smart fiber link backup and on-line fault diagnosis functions was proposed. A 1 ~ N optical switch was intelligently controlled by a peripheral interface controller （PIC） to expand the fiber link from one channel to several ones to lower the cost of the long or ultra-long distance intrusion monitoring system and also to strengthen the intelligent monitoring link backup function. At the same time, a sliding window auto-correlation method was presented to identify and locate the broken or fault point of the cable. The experimental results showed that the proposed multi-channel system performed well especially whenever any a broken cable was detected. It could locate the broken or fault point by itself accurately and switch to its backup sensing link immediately to ensure the security system to operate stably without a minute idling. And it was successfully applied in a field test for security monitoring of the 220-km-length national borderline in China.
