本論文研究光纖液體多參數感測實驗，液體參數分別是溫度、折射率及液位；並且搭配自行開發之機械式光開關與Labview軟體應用進行量測資料擷取，可針對不同光路進行切換。多參數感測使用布拉格光纖光柵及長週期光纖光柵作為感測頭，液體折射率以鹽水為樣本，長週期光纖光柵對於水溫及折射率皆有影響性；而布拉格光纖光柵則針對液位感測所設計。其中折射率感測範圍為1.336-1.376，波長總飄移量約為2.4nm，長週期光纖光柵對於外在液體折射率平均變化約為-47.46 nm/index(n)，線性度R2約為0.9896；溫度感測範圍25-50 ̊C、液體高度40cm-140cm；由雙參數之液體溫度與液體高度同步感測。實驗分析得知長週期光柵對溫度比布拉格光柵靈敏，波長總飄移量約為7.5nm，長週期光纖光柵對於外在溫度平均變化約為-0.2544 nm/℃，線性度R^2約為0.9865，而液體位置經實驗發現其溫度高低亦影響液體高度之波長飄移量，例如由低溫25 ̊C的-1.2 pm/cm下降至高溫50 ̊C條件下的-4 pm/cm，線性度R^2約為0.9967。
自主開發之1x4機械式光開關，插入損失改善到1 dB以下，除降低插入損耗外，亦達成藉由Labview程式擷取感測資料並能夠儲存光功率計量測之資料作為感測紀錄，透過機械式光開關的便利性，不僅能夠感測橋梁結構之變化，亦可根據用途作橋下或大樓水塔之水質水位之同時感測。

The aim of this thesis is to develop fiber optic sensing for liquid multi-parameter measurement. The parameters we measured including temperature, refractive index and liquid level. A home-made mechanical optical switch and a self-written Labview are used to measure the liquid parameters in different fiber routings. The home-made mechanical optical switch is convenience for switching among different optical paths.
In this thesis, two kinds of fiber gratings were fabricated and used to measure liquid multi-parameters. The home-made fiber Bragg grating (FBG) combined long period fiber grating (LPFG) were used to measure liquid refractive index, level and temperature in saline solution. It is found that LPFG is sensitive to refractive index and temperature while FBG is sensitive to liquid level. Firstly, the refractive index we measured ranging from 1.336 to 1.376 corresponding to wavelength drift of 2.4 nm. The average refractive index co-efficiency and linearity ?2 are -47.46 nm/n and 0.9896, respectively. The liquid temperature we measured ranging from 25℃ to 50℃ corresponding to wavelength shift amount of 7.5nm. The average temperature co-efficiency and linearity ?2 are -0.2544 nm/℃ and 0.9865, respectively.
Secondly, a FBG-based linear cavity fiber laser is also proposed and applied to the liquid level sensing. Liquid level sensing using saline liquid with sensing depth from 40 to 140 cm. FBGs are attached upon a carbon fiber reinforced plastics (CFRPs) to sense the water level. It was found that the liquid temperature may induce wavelength shift. By experiment, we found that as temperature increases from 25℃ to 50℃, the wavelength shift slope increases from -1.2 pm/cm to -4 pm/cm. The average sensitivity and linearity ?2 of water level sensor are 0.04572 nm/cm and 0.9967, respectively. And the total wavelength variation is about 8 nm for liquid level sensing measurement.
The 1x4 home-made mechanical optical switch has low insertion loss of less than 1 dB. The Labview software is also designed to retrieve sensing data and store the information. The proposed sensing scheme may find potential applications for simultaneously measurement of water parameters under bridge or building tower.

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