Radiation tolerant fiber Bragg gratings for high temperature monitoring at MGy dose levels
Radiation tolerant fiber Bragg gratings for high temperature monitoring at MGy dose levels
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DOI：
10.1364/ol.39.005313
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发表时间：
2014-09-15
期刊：
影响因子：
3.6
通讯作者：
Ouerdane, Y.
中科院分区：
文献类型：
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作者：
Morana, A.;Girard, S.;Ouerdane, Y.
我们报告了一种制造光纤布拉格光栅 (FBG) 的方法，可耐受高辐射剂量（高达 3 MGy）和高温（高达 230 摄氏度）的非常恶劣的环境。通过暴露于功率超过 500 mW 的 800 nm 飞秒红外激光，然后在 750 摄氏度下进行 15 分钟的热退火处理，将此类 FBG 写入两种类型的抗辐射光纤（纯二氧化硅和掺氟芯）中。在辐射下，我们的研究表明，与写入的 FBG 的响应相比，在辐射下，3 MGy 剂量下的辐射引起的布拉格波长偏移 (BWS) 大大降低在非优化条件下。对于 25 摄氏度至 230 摄氏度的照射温度，BWS 保持低于晚上 10 点，FBG 峰值幅度没有明显下降。从应用的角度来看，这种辐射引起的BWS对应于低于1.5摄氏度的温度测量的附加误差，为核工业耐辐射多点温度传感器的开发开辟了道路。 (C) 2014年美国光学学会
We report a method for fabricating fiber Bragg gratings (FBG) resistant to very severe environments mixing high radiation doses (up to 3 MGy) and high temperatures (up to 230 degrees C). Such FBGs have been written in two types of radiation resistant optical fibers (pure-silica and fluorine-doped cores) by exposures to a 800 nm femtosecond IR laser at power exceeding 500 mW and then subjected to a thermal annealing treatment of 15 min at 750 degrees C. Under radiation, our study reveals that the radiation induced Bragg wavelength shift (BWS) at a 3 MGy dose is strongly reduced compared to responses of FBGs written with nonoptimized conditions. The BWS remains lower than 10 pm for temperatures of irradiation ranging from 25 degrees C to 230 degrees C without noticeable decrease of the FBG peak amplitude. For an applicative point of view, this radiation induced BWS corresponds to an additional error on the temperature measurements lower than 1.5 degrees C, opening the way to the development of radiation-tolerant multi-point temperature sensors for nuclear industry. (C) 2014 Optical Society of America