本論文內容主要為介紹一種使用者能自行安裝的光纖式干涉儀入侵感測系統。此系統共有四個防禦區域，由四個防禦區域的外部共振腔各別產生不同波長的雷射光並進行干涉，而干涉後的訊號光再反射回傳至四個對應波長的PD，然後進入DAQ(數據採集卡)再透過電腦進行數據採集及觀察。戶外實驗中，我們將系統設置在山上，每防區以大約1公尺長的單芯光纜作為感測器將其安置在柵欄上，透過分析各防區接收到的訊號光，便可得知是否遭到入侵。而接受到的訊號經DAQ透過電腦來進行數據採集並計算出各防區的三個參數visibility、level crossing和frequency ratio，再分別找出各防區的閾值來進行比較，只有當所有參數都超過各防區設定好的閾值時才會發生警報並將其判定為入侵。本次研究設計的系統是僅需使用一條單模光纖即可串接多個防區，防區間也沒有互相干擾的情形，並且客戶是能夠自行安裝的，是簡單又具有成本效益的方法。

The main content of this thesis introduces a fiber-optic interferometer intrusion detection system that users can install by themselves. This system consists of four defense zones, each with an external resonant cavity generating laser light of different wavelengths for interference. The interfered signal light is then reflected back to four corresponding wavelength photodetectors (PD), and subsequently enters a data acquisition (DAQ) system for data collection and observation via a computer. In outdoor experiments, the system was deployed on a mountain, with approximately 1-meter-long single-mode fiber optic cables serving as sensors installed on fences for each defense zone. By analyzing the received signal light in each zone, intrusion can be detected. The received signals are processed by the DAQ system via a computer for data collection and calculation of three parameters for each defense zone: visibility, level crossing, and frequency ratio. Threshold values are then determined for each parameter in each zone for comparison. An alarm will be triggered and classified as an intrusion only when all parameters exceed their respective threshold values for each defense zone.An alarm is triggered only when all parameters exceed their respective threshold values, indicating intrusion. The system designed in this study requires only a single-mode fiber optic cable to connect multiple defense zones without interference between zones. Moreover, it is designed for self-installation by customers, offering a simple and cost-effective solution.

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