利用自發性布里淵散射技術之分佈型應變與溫度感測

Abstract

本篇論文針對了利用布里淵散射效應達到分佈型應變與溫度感測系統的兩個主題進行相關的研究，包括了應變與溫度的分離技術與改善空間解析度的探討。 在應變與溫度的分離部分，本文提出了一種利用感測光纖本身固有特性達到分離的方法，與現有研究中提出的方法比較，此種方法使得整個感測系統更加簡單、實用性更高、解析度更高且分離效果更好。 在空間解析度的改善方面，則是提出一種分解布里淵頻譜的訊號處理方法，不但解決了現有研究提出方法的問題，且擁有更大的動態範圍，更高的空間及位置解析度以及更高的溫度解析度。

In this thesis, two topics related to fiber sensors through Brillouin frequency shift, including the simultaneous measurement of fiber strain and temperature and the improvement of spatial resolution, have been studied. In the part of the simultaneous measurement of fiber strain and temperature, we propose a new method that utilizes a dispersion-shifted fiber. Comparing with the methods proposed, this method has the advantages of simplicity, high sensitivity and good resolution. Furthermore, in the part of the improvement of spatial resolution, a new technique employing spectrum decomposing is used to enhance the spatial and position resolution and to provide large dynamic range and high resolution in the same time. These two methods have also been successfully demonstrated experimentally. They are expected to be very useful in distributed fiber sensing systems.