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在正六边形包层空气孔中填充特定负折射率温度系数材料,通过温度自补偿实现非温度依赖的应变传感检测。基于耦合模理论,建立传感分析模型,结合控制变量法对不同温度和波长下的模式有效折射率进行数值分析。在包层空气孔填充不同液体材料,探究基模以及一阶光波模式的谐振波长对温度的不敏感特性,并对PCFBG中不同光波模式的温度/应变传感特性进行对比研究。计算结果表明,在包层空气孔填充材料I,环境温度由-20℃升至100℃,基模光场的反射峰中心波长仅漂移2.3pm,应变灵敏度达到1.234 8pm/με;在包层空气孔填充材料II,一阶光波模式仅漂移4.6pm,应变灵敏度为1.311 8pm/με。表明在光子晶体光纤包层空气孔中填充对应的温度补偿材料能有效实现具备温度稳定性的高灵敏度应变传感监测。
The hexagonal cladding air hole is filled with a specific negative refractive index temperature coefficient material, and the temperature independent compensation is used to realize the non-temperature-dependent strain sensing detection. Based on the coupled-mode theory, a sensory analysis model is established, and the mode-effective refractive index under different temperature and wavelength is numerically analyzed with the control variable method. In the cladding air holes, different liquid materials were filled in to investigate the temperature-insensitive characteristics of the fundamental mode and the first-order lightwave mode resonant wavelength, and to compare the temperature / strain sensing characteristics of different lightwave modes in the PCFBG. The calculated results show that the center wavelength of reflection peak in the mode field is only about 2.3pm and the strain sensitivity reaches 1.234 8 pm / με when the ambient air filling material I is increased from -20 ℃ to 100 ℃. In the cladding air Hole fill material II, the first-order lightwave mode only drifts 4.6pm and the strain sensitivity is 1.3118 pm / με. It is indicated that the corresponding temperature compensation material can be filled in the air hole of the photonic crystal fiber cladding to effectively realize the high sensitivity strain sensing monitoring with temperature stability.