In this work, a simple fiber Fabry-Perot air-cavity interferometer (FPI) is formed by splicing a 246 μm long hollow core silica tube (HCST) between two single mode fibers (SMFs). In the thermal characterization test, the FPI exhibits limited linear range up to 700 °C in the first cycle of isochronal annealing treatment from room temperature up to 1000 °C. However, after a series of repeated isochronal thermal annealing, the temperature response of the proposed FPI is extended further to 1000 °C with a good thermal repeatability. Meanwhile, the annealed FPI has linear axial strain sensitivities up to 1000 με from room temperature up to 800 °C. The proposed fiber structure is a potential sensor for high-temperature or stress measurement in aeronautical or metallurgical fields.

在这项工作中，通过在两个单模光纤（SMF）之间拼接一个246μm长的空心二氧化硅管（HCST），形成了一个简单的光纤Fabry-Perot气腔干涉仪（FPI）。在热特性测试中，FPI在从室温到最高1000°C的等时退火处理的第一个循环中，显示出高达700°C的有限线性范围。但是，经过一系列重复的等时热退火之后，提出的FPI的温度响应进一步扩展到1000°C，并具有良好的热重复性。同时，退火后的FPI从室温到800°C的线性轴向应变敏感性高达1000με。所提出的纤维结构是用于航空或冶金领域中高温或应力测量的电势传感器。