Sensitivity characteristics of long-period fiber gratings
Sensitivity characteristics of long-period fiber gratings
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DOI：
10.1109/50.983240
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发表时间：
2002-02-01
影响因子：
4.7
通讯作者：
Bennion, I
中科院分区：
文献类型：
--
作者：
Shu, XW;Zhang, L;Bennion, I
我们提出了一个详细的调查长周期光纤光栅（LPFGs）的灵敏度作为温度，应变和周围的折射率的函数，特别注意高阶包层模式和超灵敏传感器的可能性。从一般的理论分析，我们确定了一个一般的灵敏度因子，它提供了新的物理洞察LPFG的行为，并代表了一个有用的设计辅助结合一组测量特定的灵敏度因子。我们的分析揭示了在模式色散特性中存在转折点，在该转折点处可以获得超灵敏操作。在一组广泛的协调实验中，我们验证了理论预测与密切的协议，并提供演示的设备行为接近转折点。替代传感器方案的温度，应变和折射率，分别基于测量的双谐振特性的模式和传输特性接近的转折点，利用高阶模式的长周期光纤光栅，提出。对于至少两个变量，我们记录了最高的LPFG灵敏度尚未报告。
We present a detailed investigation into the sensitivity of long-period fiber gratings (LPFGs) as a function of temperature, strain, and surrounding refractive index, with particular attention to the higher order cladding modes and the possibilities for ultrasensitive sensors. From a general theoretical analysis, we identify a general sensitivity factor which offers new physical insight into LPFG behavior and represents a useful design aid in conjunction with a set of measurand-specific sensitivity factors. Our analysis reveals the existence of turning points in the mode dispersion characteristics at which ultrasensitive operation may be obtained. In an extensive set of coordinated experiments, we verify the theoretical predictions with close agreement and provide demonstrations of the device behavior close to the turning points. Alternative sensor schemes for temperature, strain, and refractive index based, respectively, on measurement of the dual resonance characteristic of the modes and on the transmission characteristics close to the turning points, utilizing higher order modes of the LPFG, are presented. For two variables at least, we record the highest LPFG sensitivities yet reported.