Coviello Gianluca, Finazzi Vittoria, Villatoro Joel, Pruneri Valerio
ICFO-Institut de Ciencies Fotoniques, Mediterranean Technology Park, 08860 Castelldefels (Barcelona), Spain.
Opt Express. 2009 Nov 23;17(24):21551-9. doi: 10.1364/OE.17.021551.
We report on the development of a stable Photonic Crystal Fiber (PCF) based two-mode interferometric sensor for ultra-high temperature measurements (up to 1000 degrees C). The device consists of a stub of PCF spliced to standard optical fiber. In the splice regions, the voids of the PCF are fully collapsed, thus allowing the excitation and recombination of two core modes. The device spectrum exhibits sinusoidal interference pattern which shifts with temperature. We show that, despite being compact and robust, the proposed sensor head needs a quite long burn in (thermal annealing) to achieve an adequate and stable functionality level. The burn in process eliminates the residual stress in the fiber structure, which had been accumulated during the drawing phase, and changes the glass fictive temperature.
我们报告了一种基于光子晶体光纤（PCF）的稳定双模干涉传感器的开发，用于超高温测量（高达1000摄氏度）。该装置由一段熔接到标准光纤的光子晶体光纤短截线组成。在熔接区域，光子晶体光纤的空隙完全塌陷，从而允许两个纤芯模式的激发和复合。该装置的光谱呈现出随温度变化的正弦干涉图案。我们表明，尽管所提出的传感器头紧凑且坚固，但需要相当长的老化（热退火）时间才能达到足够且稳定的功能水平。老化过程消除了在拉丝阶段积累的光纤结构中的残余应力，并改变了玻璃虚构温度。
