【摘要】：溫度傳感器被廣泛應用于農業(yè)、工業(yè)、物聯(lián)網(wǎng)等諸多領域,光纖溫度傳感器具有電絕緣、耐高壓、耐腐蝕的特點,保偏光子晶體光纖依靠其優(yōu)良的高雙折射特性成為光纖傳感技術領域的研究熱點,保偏光子晶體光纖是溫度傳感器的重要組成元件,其性能的好壞決定了溫度傳感器靈敏度的高低。本文提出了一種新型混合晶格結構的保偏光子晶體光纖,該光纖由矩形空氣孔和圓形空氣孔混合排列而成。首先使用基于有限元法的Comsol軟件研究了該光纖的基模模場分布及雙折射特性,并分析了不同結構參數(shù)變化對光纖模式雙折射特性及拍長特性的影響。研究表明,隨著工作波長的增大,光纖的雙折射也增大,在0.4μm到2.0μm波段模式雙折射保持在10-2量級。當空氣孔間距Λ壓縮至1μm,矩形空氣孔面積A為1μm×0.1μm,圓形空氣孔直徑D增大到0.96μm時,工作波長λ為1550nm的光纖雙折射可達到3.4849×10-2。在此基礎上從溫敏液體的選擇、填充方式的確定及光纖結構參數(shù)的變化三個方面研究了此新型結構保偏光子晶體光纖的溫敏特性,研究結果表明,使用乙醇液體填充纖芯區(qū)域圓形空氣孔,一定結構參數(shù)下光子晶體光纖溫度靈敏度達到10-5數(shù)量級。最后將該光纖用于Sagnac結構的保偏光子晶體光纖溫度傳感器設計,通過Matlab進行仿真分析,結果表明,使用1450nm—1650nm的寬譜光源入射時,基于此保偏光子晶體光纖的Sagnac光纖溫度傳感器的透射譜諧振峰隨溫度變化產生明顯偏移,傳感器靈敏度為2nm/℃,線性測量范圍為-30℃~78℃。該溫度傳感器具有抗電磁干擾、小型化、靈敏度高、測量范圍寬等優(yōu)點,在工業(yè)檢測和控制中有廣泛的應用。
[Abstract]:Temperature sensor is widely used in agriculture, industry, Internet of things and many other fields. Optical fiber temperature sensor has the characteristics of electrical insulation, high voltage resistance and corrosion resistance. Polarization-maintaining photonic crystal fiber (PCF) is an important component of temperature sensor because of its excellent high birefringence in the field of optical fiber sensing technology, and the polarization-maintaining photonic crystal fiber (PCF) is an important component of the temperature sensor. The sensitivity of temperature sensor is determined by its performance. A novel polarization-maintaining photonic crystal fiber with mixed lattice structure is presented in this paper. The fiber is composed of rectangular air holes and circular air holes. Firstly, the basic mode field distribution and birefringence characteristics of the fiber are studied by using Comsol software based on the finite element method, and the effects of different structural parameters on the birefringence and beat length of the fiber are analyzed. The results show that the birefringence of the fiber increases with the increase of the operating wavelength, and the mode birefringence in the range from 0.4 渭 m to 2.0 渭 m remains in the order of 10 渭 2. When the air hole spacing is compressed to 1 渭 m, the rectangular air hole area A is 1 渭 m 脳 0.1 渭 m, and the diameter of circular air hole D is increased to 0.96 渭 m, the birefringence of the fiber with 位 1550nm can reach 3.4849 脳 10 ~ (- 2). On this basis, the temperature-sensitive characteristics of the novel polarization-maintaining photonic crystal fiber are studied from three aspects: the selection of thermosensitive liquid, the determination of filling mode and the change of fiber structural parameters. The results show that: When ethanol liquid is used to fill circular air holes in the core region, the temperature sensitivity of photonic crystal fiber can reach the order of 10 ~ (5) under certain structural parameters. Finally, the fiber is applied to the design of polarization-maintaining photonic crystal fiber temperature sensor in Sagnac structure, and the simulation analysis is carried out by Matlab. The results show that when the wide-spectrum light source of 1450nm-1650nm is used to incident, Based on the polarization-maintaining photonic crystal fiber, the resonant peak of transmission spectrum of Sagnac optical fiber temperature sensor is obviously shifted with the change of temperature. The sensitivity of the sensor is 2nm/ 鈩，

本文編號：2467079