Markowski Konrad, Araszkiewicz Piotr, Bojarczuk Juliusz, Perlicki Krzysztof
Opt Lett. 2020 May 15;45(10):2838-2841. doi: 10.1364/OL.390784.
In this Letter, a novel, to the best of our knowledge, Fabry-Perot cavity, based on Bragg grating technology for temperature and strain monitoring, is presented. Such a structure consists of two linearly chirped fiber Bragg gratings of a significant length written in a thermally tapered optical fiber. The technological process for manufacturing such a grating allows for utilization of almost every tapered fiber, by means of its profile and also phase masks with various chirp ratios. For this type of structure, a method for strain discrimination based on monitoring of the cavity length is proposed, enabling potential multiplexation of the sensor of two structures, which have the similar reflection spectra, by means of their spectral position. The utilized sensing mechanism allowed for achieving strain sensitivity by means of the cavity length change as high as 5 µm/µɛ. Also, as it has been experimentally shown a structure can also be employed for measurements of temperature, with the sensitivity equal to 8.96 pm/°C.
在本信函中，据我们所知，提出了一种基于布拉格光栅技术用于温度和应变监测的新型法布里 - 珀罗腔。这种结构由写在热锥形光纤中的两个相当长的线性啁啾光纤布拉格光栅组成。制造这种光栅的工艺过程允许通过其轮廓以及具有各种啁啾率的相位掩膜来利用几乎每根锥形光纤。对于这种结构类型，提出了一种基于监测腔长的应变鉴别方法，通过其光谱位置能够实现对具有相似反射光谱的两种结构的传感器进行潜在复用。所采用的传感机制通过高达5 µm/µɛ的腔长变化实现了应变灵敏度。此外，实验表明该结构也可用于温度测量，灵敏度等于8.96 pm/°C。
