Direct inscription and evaluation of fiber Bragg gratings in carbon-coated optical sensor glass fibers for harsh environment oil and gas applications

Nedjalkov Antonio; Meyer Jan; Waltermann Christian; Reimer Maximilian; Gillooly Andy; Angelmahr Martin; Schade Wolfgang

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Direct inscription and evaluation of fiber Bragg gratings in carbon-coated optical sensor glass fibers for harsh environment oil and gas applications

机译：碳涂层光学传感器玻璃纤维中纤维布拉格光栅的直接铭文和评价，用于苛刻环境油和气体应用

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In this research work, we show the successful inscription of fiber Bragg gratings into carbon-coated pure silica as well as germanium-doped glass fibers by applying the pulsed laser point-by-point manufacturing technique. First, the parameters used for the Ti:sapphire femtosecond laser process are demonstrated. Without removing the polymeric carbon coating, destruction-free formation of highly reflective Bragg gratings is performed with selected types of hermetically enclosed fibers. We demonstrate the advantage of the carbon coating by long-term exposure to a pure hydrogen atmosphere at an elevated temperature. Such harsh conditions exist in the oil and gas industry, which means there is high application potential for technologically advanced optical sensors. Compared to the also examined standard glass fibers with a distinct signal attenuation, carbon-coated fibers show no significant degradation. Finally, we analyze the mechanical stability of the processed fibers via standardized tensile tests. No substantial decrease in strength occurs among the sensor-integrated samples. (C) 2018 Optical Society of America

机译：在这项研究工作中，我们通过施加脉冲激光点逐方制造技术，展示纤维布拉格光栅的纤维布拉格光栅的掺杂纯二氧化硅以及锗掺杂的玻璃纤维。首先，对Ti的参数进行说明：Sapphire Femtosecond激光过程。在不除去聚合物碳涂层的情况下，使用选定类型的气密封闭的纤维进行高度反射布拉格光栅的无破坏性形成。我们通过长期暴露于纯氢气氛在升高的温度下证明了碳涂层的优点。石油和天然气工业中存在这种恶劣的条件，这意味着技术先进的光学传感器的应用潜力很高。与另外的信号衰减的药物玻璃纤维相比，碳涂覆的纤维显示出没有显着的降解。最后，我们通过标准化的拉伸试验分析加工纤维的机械稳定性。传感器集成样本中不发生实质性降低。（c）2018年光学学会

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《Applied optics》 |2018年第26期|共11页
作者
Nedjalkov Antonio; Meyer Jan; Waltermann Christian; Reimer Maximilian; Gillooly Andy; Angelmahr Martin; Schade Wolfgang;
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Fraunhofer Heinrich Hertz Inst Dept Fiber Opt Sensor Syst Stollen 19H D-38640 Goslar Germany;

Fraunhofer Heinrich Hertz Inst Dept Fiber Opt Sensor Syst Stollen 19H D-38640 Goslar Germany;

FiSens GmbH Rebenring 33 D-38106 Braunschweig Germany;

Tech Univ Clausthal Inst Management &

Econ Julius Albert Str 2 D-38678 Clausthal Zellerfeld Germany;

Fibercore Ltd Univ Pkwy Southampton Sci Pk Southampton SO16 7QQ Hants England;

Fraunhofer Heinrich Hertz Inst Dept Fiber Opt Sensor Syst Stollen 19H D-38640 Goslar Germany;

Fraunhofer Heinrich Hertz Inst Dept Fiber Opt Sensor Syst Stollen 19H D-38640 Goslar Germany;

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Direct inscription and evaluation of fiber Bragg gratings in carbon-coated optical sensor glass fibers for harsh environment oil and gas applications

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