本論文是以Mach-Zehnder干涉儀為光纖感測器架構，干涉儀兩臂同時作為感測光纖段，並自行製作一摻鉺光纖環型共振腔雷射為光源，同一光源以前後雙向進入感測架構中，前後向各有一光偵測器接收干涉訊號。入侵感測位置與干涉儀前、後端距離有一長度差，我們把此長度差推算為兩干涉訊號的時間延遲，兩時間延遲的訊號以互相關運算(cross-correlation)作分析，進而達到入侵感測與定位的效果。

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