非對稱同軸塞格內克光纖溫度感測器之研製

The Study of Unbalanced In-Line Sagnac Fiber-Optics Temperature Sensor

曹榮勳(Tsau-Rong Xun)

指導教授 ： 王文壽 ； 林鴻銘

崑山科技大學/工程學院/電子工程研究所/碩士(2004年)

https://doi.org/10.6828/KSU.2004.00008

摘要

本文以所提出之新型非對稱同軸塞格內克光纖干涉儀為感測架構，使用應力感應型高雙折射光纖為感測元件，利用光譜干涉原理，量測干涉光譜的位移達到感溫之目的。感測光纖之長度與感測靈敏度成正比，本實驗在感測光纖70cm時有最佳感測響應，位移靈敏度達1.476nm/℃，相對溫度解析度為0.04℃，平均誤差率為0.78%，而利用干涉峰值寬 的變化可量測絕對溫度，其靈敏度為0.013nm/℃。爲使感測系統最佳化，研究以C+L波段自發性光纖光源為感測光源，其具頻寬1520~1620nm，光功率可達16dBm，且波長穩定度佳，光輸出無極化方向，可降低系統之強度雜訊與系統之偏振漂移，提高感測解析度與精準度響應，其未來在感測系統的應用上，有極高的發展潛力。

關鍵字

溫度感測 ； 光纖感測

並列摘要

We demonstrate a highly sensitive temperature sensor with a stress-induced high-birefringence-fiber as the sensing component, the new design of Unbalanced In-Line Sagnac Fiber-Optics interferometer that is able to sense the temperature using spectral domain by shifts. Knowing the length and the sensitivity of sensor fiber are proportional to each other, the result of this research shows the sensor fiber has the highest sensitivity at length 70cm, the sensitivity is 1.476nm/℃, and the resolution is 0.04℃; the average inaccuracy is 0.78%. When using separation between peak to measure absolute Temperature, its sensitivity is 0.013 nm/℃. In order to optimize the system, C+L band ASE was used as sensor source. Not only its bandwidth expands from 1520nm to 1620nm, and output power up to 16dBm, it has high wavelength stability and no polarization direction. All those advantages can lower the system’s intensity noise and polarization floating while augmenting the resolution and accuracy. In short, with C+L band ASE light sources, this newly designed system’s application on the sensor system will be immeasurable.

並列關鍵字

Optical Fiber Snsor ； Temperature Sensor

參考文獻

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