基于空芯光子晶体光纤(HCPCF)耐高温、温度稳定性好的特性, 对利用空芯光子晶体光纤与两根普通单模光纤通过熔接构成的微小型光纤法布里-珀罗(F-P)干涉仪进行了高温应变特性实验研究。结果表明, 在100～700 ℃温度范围内, HCPCF F-P具有较好的温度稳定性, 并测得600 ℃的温度下其应变测量的灵敏度约为5.94 nm/με, 线性度约为0.9997, 温度对应变灵敏度的最大影响约1.5%, 测量精度约0.08% FS。理论和实验结果表明高温下HCPCF F-P具有温度灵敏度较低, 应变灵敏度较高, 温度对应变灵敏度的交叉影响小, 线性度和重复性好, 且没有迟滞现象以及应变测量范围大等优点。

Based on the characteristics of high temperature resistance and well temperature stability of hollow core photonic crystal fiber (HCPCF), high temperature strain response of the micro Fabry-Perot etalon(HCPCF F-P) fabricated by splicing a section of hollow core photonic crystal fiber in between two single-mode fibers is reported. Experimental results show that the HCPCF F-P has good temperature stability in the range of 100 ℃ to 700 ℃, and the strain sensitivity and linearity of HCPCF F-P is ～5.94 nm/με and ～0.9997 at 600 ℃,respectively. The max cross-influence of temperature on the strain is just about 1.5%, and the measuring accuracy is about 0.08% FS. Furthermore, the theoretical and experimental results show that the temperature sensitivity and the influence of temperature on strain of the HCPCF F-P is low, while the sensitivity, linearity and repeatability of strain of the HCPCF F-P is very high. The strain sensor has large strain measure range and no hysteresis.