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�������պ����ѧѧ�� 2009, Vol. 35 Issue (5) :618-622    DOI:
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Sensing theory of fiber optic intrusion sensor based on multimode fiber intensity modulation
Li Chenguang, Yang Dewei, Luo Guangming, Li Chen*
School of Instrument Science and Opto-electronics Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100191, China

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Abstract�� An intrusion sensor adopting a "single-mode multimode single-mode" (SMS)structure was introduced. The actual sensor element was the multimode fiber spliced to two single-mode fibers on its two ends. In order to improve the sensing sensitivity, the theory of intensity modulation was researched. High sensitive sensor structure was obtained by simulation and experiment. The sensor uses coherent light source, step-index multimode fiber, and splices the single-mode fibers and the multimode fiber along the fiber axis. This scheme can be deployed to various intrusion sensing applications such as country borders, military bases, oil pipelines, for its simple structure and long sensing distance.
Keywords�� fiber optic sensors   optical fiber intrusion alarm   multimode fiber     
Received 2008-08-10;
About author: ���(1982-),��,�ӱ��żҿ���,˶ʿ��,dawn100@126.com.
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���, ���ΰ, �޹���, �� �.��ģ����ǿ�ȵ������Ŷ�����������ԭ��[J]  �������պ����ѧѧ��, 2009,V35(5): 618-622
Li Chenguang, Yang Dewei, Luo Guangming, Li Chen.Sensing theory of fiber optic intrusion sensor based on multimode fiber intensity modulation[J]  JOURNAL OF BEIJING UNIVERSITY OF AERONAUTICS AND A, 2009,V35(5): 618-622
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http://bhxb.buaa.edu.cn//CN/     ��     http://bhxb.buaa.edu.cn//CN/Y2009/V35/I5/618
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