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Thermally induced emission from hydroxyl groups in fused silica optical fibers

机译：熔融石英光纤中羟基的热诱导发射

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摘要

Hydroxyl is one of the most common impurities in fused silica optical fibers. For an optical fiber based sensor operating at lower temperatures, hydroxyl presence in the fiber core causes absorption in the near infrared region. When the sensor is exposed to a high temperature environment, emission from hydroxyl can be strong enough to affect accuracy of the sensor. To better understand the hydroxyl emission phenomenon in silica optical fibers at high temperatures, the emission intensity of step index, pure silica core, multimode fibers was measured at temperatures from 600 degrees C to 1200 degrees C, and was used to evaluate the activation energy of the thermally induced emission. The removal of hydroxyls by annealing the silica fiber in a nitrogen environment was also conducted at selected temperatures to determine the time dependence of the process. The measurements and calculations show that the hydroxyl emission intensity increases exponentially with temperature, and that the hydroxyl removal process also follows an Arrhenius relationship. The results give insight into appropriate optical fiber sensor designs to minimize signal degradation caused by hydroxyl emission intensity change.
机译：羟基是熔融石英光纤中最常见的杂质之一。对于在较低温度下运行的基于光纤的传感器，纤维纤芯中存在羟基会导致在近红外区域吸收。当传感器暴露于高温环境中时，羟基发出的光可能足以影响传感器的精度。为了更好地理解高温下石英光纤中的羟基发射现象，在600℃至1200℃的温度下测量了阶跃指数，纯石英纤芯，多模光纤的发射强度，并用于评估其活化能。热致发射。还通过在氮气氛下对二氧化硅纤维进行退火来除去羟基，以测定该过程的时间依赖性。测量和计算表明，羟基释放强度随温度呈指数增加，并且羟基去除过程也遵循阿伦尼乌斯（Arrhenius）关系。结果有助于深入了解合适的光纤传感器设计，以最大程度地减少由羟基发射强度变化引起的信号衰减。

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  • 来源
    《Optical fiber technology》 |2019年第11期|101951.1-101951.6|共6页
  • 作者

    Yu Li; Homa Daniel; Ohodnicki Paul Jr.; Buric Michael; Chorpening Benjamin; Pickrell Gary; Wang Anbo;

  • 作者单位

    Virginia Polytech Inst & State Univ Ctr Photon Technol Bradley Dept Elect & Comp Engn 460 Turner St Suite 303 Blacksburg VA 24061 USA;

    Virginia Polytech Inst & State Univ Dept Mat Sci & Engn 213 Holden Hall Blacksburg VA 24061 USA;

    Natl Energy Technol Lab 3610 Collins Ferry Rd Morgantown WV 26507 USA|Carnegie Mellon Univ Dept Mat Sci & Engn Pittsburgh PA 15213 USA;

    Natl Energy Technol Lab 3610 Collins Ferry Rd Morgantown WV 26507 USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
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