Accurate high-temperature profile sensing with dense multipoint arrays of regenerated fiber Bragg gratings

IF 4.4 2区 物理与天体物理 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Results in Physics Pub Date : 2024-09-12 DOI:10.1016/j.rinp.2024.107970
Andrea Stadler , Andreas Zeisberger , Fabian Buchfellner , Alexander Roehrl , Alexander W. Koch , Johannes Roths
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Abstract

A spectrally and spatially dense sensor array consisting of 15 regenerated fiber Bragg gratings (RFBGs) over a length of 30 mm is presented for precise and fast multipoint temperature sensing up to 700°C. For the first time, it could be shown that with a dense fiber Bragg grating (FBG)-based sensor array the accuracy requirements of Class 1 thermocouples could be achieved and even exceeded. This also represents the highest spatial density of FBG-based high-temperature multipoint sensing reported so far. The mitigation of broadband losses during the regeneration process was studied, revealing the advantages of the low broadband loss characteristics of the RFBGs, especially when larger numbers of measuring points are required. Low measurement uncertainties were achieved by a new, improved calibration methodology and by an analysis of interferences of an FBG with the side lobes of spectrally neighboring FBGs as well as their suppression by a suitable arrangement of the Bragg wavelengths within the array and corresponding data processing. The capabilities of this multipoint sensor technique were demonstrated by resolving the temperature profile within the calibration volume of a calibration furnace and by resolving the temporal and spatial temperature gradients within the flame of a Bunsen burner. The results are of great importance for fiber-optic sensing of high-temperature profiles in real-world applications.
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利用再生光纤布拉格光栅密集多点阵列进行精确的高温轮廓传感
本文介绍了一种由 15 个长度为 30 毫米的再生光纤布拉格光栅(RFBG)组成的光谱和空间致密传感器阵列,用于精确、快速的多点温度传感,最高温度可达 700°C。这首次表明,使用基于密集光纤布拉格光栅(FBG)的传感器阵列,可以达到甚至超过 1 级热电偶的精度要求。这也是迄今为止报道的基于 FBG 的高温多点传感的最高空间密度。对再生过程中宽带损耗的缓解进行了研究,揭示了 RFBG 低宽带损耗特性的优势,尤其是在需要大量测量点的情况下。通过一种新的、改进的校准方法,以及对 FBG 与光谱相邻 FBG 的边叶干扰的分析,并通过阵列内布拉格波长的适当排列和相应的数据处理来抑制边叶干扰,实现了较低的测量不确定性。通过解析校准炉校准容积内的温度曲线和解析本生灯火焰内的时空温度梯度,证明了这种多点传感器技术的能力。这些结果对于光纤传感实际应用中的高温剖面具有重要意义。
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来源期刊
Results in Physics
Results in Physics MATERIALS SCIENCE, MULTIDISCIPLINARYPHYSIC-PHYSICS, MULTIDISCIPLINARY
CiteScore
8.70
自引率
9.40%
发文量
754
审稿时长
50 days
期刊介绍: Results in Physics is an open access journal offering authors the opportunity to publish in all fundamental and interdisciplinary areas of physics, materials science, and applied physics. Papers of a theoretical, computational, and experimental nature are all welcome. Results in Physics accepts papers that are scientifically sound, technically correct and provide valuable new knowledge to the physics community. Topics such as three-dimensional flow and magnetohydrodynamics are not within the scope of Results in Physics. Results in Physics welcomes three types of papers: 1. Full research papers 2. Microarticles: very short papers, no longer than two pages. They may consist of a single, but well-described piece of information, such as: - Data and/or a plot plus a description - Description of a new method or instrumentation - Negative results - Concept or design study 3. Letters to the Editor: Letters discussing a recent article published in Results in Physics are welcome. These are objective, constructive, or educational critiques of papers published in Results in Physics. Accepted letters will be sent to the author of the original paper for a response. Each letter and response is published together. Letters should be received within 8 weeks of the article''s publication. They should not exceed 750 words of text and 10 references.
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