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基于空芯光子晶体光纤(HCPCF)的在线法-珀标准件(ILFE)应变传感器的应变灵敏度高,对温度敏感系数小,其腔长可制作得比传统ILFE长,适于在一路光路中进行频分复用从而扩大多点应变检测的准分布应变传感系统的容量。理论分析了制作中提高基于空芯光子晶体光纤的在线法-珀应变传感器输出信号的方案,通过实例讨论了光源时间相干长度对该类法-珀腔腔长的限制。结合波分频分复用,进行了基于该复用方法的应变测试实验研究,实验结果表明,其测量精度可达±5με,可用于大型结构健康监测。
On-line Perot-Standard (ILFE) strain transducers based on hollow-core photonic crystal fibers (HCPCFs) have high strain sensitivity and low temperature sensitivity, and their cavity lengths can be made longer than conventional ILFE for use in a single optical path Frequency division multiplexing to expand the capacity of quasi-distributed strain sensing systems for multi-point strain sensing. The scheme of improving the output signal of the in-line Peripheral sensor based on the hollow-core photonic crystal fiber is theoretically analyzed. The limitation of the coherence length of the light source on the cavity length is discussed through examples. Combined with the WDM, a strain test based on this multiplexing method is carried out. The experimental results show that the measurement accuracy can be up to ± 5με, which can be used to monitor the health of large structures.