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基于在折射率引导型光子晶体光纤(PCF)上写制长周期光栅(LPG),并填充折射率温度敏感型液体,提出了一种新型温度传感器。应用全矢量有限元法,计算了在六角形结构排列的大模场面积光子晶体光纤(LMA-PCF)的空气孔中填充液体乙醇前后,PCF的纤芯基模和包层模的模场分布和色散曲线。根据耦合模理论,分析了光子晶体光纤长周期光栅(PCF-LPG)的传输谱随温度变化的关系。研究表明,填充液体乙醇后,在-20℃～80℃范围内PCF-LPG传输谱中心波长随温度近似以线性变化,其温度敏感度为1.766nm/℃。
A novel temperature sensor is proposed based on writing a long period grating (LPG) on a refractive index guided photonic crystal fiber (PCF) and filling a refractive index temperature sensitive liquid. The full-field finite element method was used to calculate the mode field distribution of the PCF core and cladding modes before and after filling the air holes in the hexagonal LMA-PCF with air holes. And dispersion curve. According to the coupled-mode theory, the relationship between the transmission spectrum and the temperature of PCF-LPG is analyzed. The results show that the center wavelength of PCF-LPG emission spectrum changes linearly with the temperature in the range of -20 ℃ ~ 80 ℃ after filling with liquid ethanol, and the temperature sensitivity of PCF-LPG is 1.766nm / ℃.