Zhang Pan, Yang Hangzhou, Wang Yupeng, Liu Hui, Lim Kok-Sing, Gunawardena Dinusha S, Ahmad Harith
Appl Opt. 2017 Aug 1;56(22):6073-6078. doi: 10.1364/AO.56.006073.
In this work, we have proposed a sensor for strain measurement in high-temperature environments up to 800°C by employing two regenerated fiber Bragg gratings. Two seed gratings (SGs) are inscribed in high Ge-doped and B/Ge-codoped fibers, respectively, which possess different temperature sensitivities. To achieve two gratings with different strain sensitivities, one of the gratings is chemically etched to reduce the fiber diameter for strain sensitivity enhancement. A thermal annealing process is carried out to activate the grating regeneration in the SGs. The temperature and strain calibration experiments indicate that the proposed structure has uncertainty values of 23.42 με and 5.83°C over the ranges of 0-1000 με and 20°C-800°C, respectively.
在这项工作中，我们提出了一种通过使用两个再生光纤布拉格光栅来测量高达800°C高温环境下应变的传感器。两个种子光栅（SGs）分别写入高掺锗光纤和硼/锗共掺光纤中，它们具有不同的温度敏感性。为了获得具有不同应变敏感性的两个光栅，对其中一个光栅进行化学蚀刻以减小光纤直径，从而增强应变敏感性。进行热退火处理以激活种子光栅中的光栅再生。温度和应变校准实验表明，所提出的结构在0 - 1000με和20°C - 800°C范围内的不确定度值分别为23.42με和5.83°C。
