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Enhanced sensitivity of distributed-temperature sensor with Al-coated fiber based on OFDR

机译：基于DDR的AL涂层光纤增强了分布式温度传感器的灵敏度

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摘要

In this paper, we present a distributed-optical fiber temperature sensor with enhanced sensitivity with Al coating using the Rayleigh backscattering (RBS) spectrum shift measured via optical frequency-domain reflectometry (OFDR). The Al-coated sensing fiber having a larger thermal expansion coefficient than that of silica produces a strain-coupled shift in the RBS under an increase in temperature. This effect leads to an enhanced temperature sensitivity of the distributed measurement scheme. In order to analyze the principle of temperature sensitivity enhancement, a simple analysis was performed by considering the fiber directional strain and force equilibrium between the optical fiber and Al-coated layer. Our results revealed that the temperature sensitivity achieved with the Al-coated fiber in OFDR was similar to 56% higher relative to that of a single-mode fiber.
机译：在本文中，我们使用光学频率域反射测量（OFDR）测量的瑞利反向散射（RBS）光谱偏移，介绍了分布式光纤温度传感器，其与Al涂层的灵敏度增强。具有较大的热膨胀系数的Al涂覆的感测纤维比二氧化硅的热膨胀系数较大，在温度的增加下产生RBS的应变耦合偏移。该效果导致分布式测量方案的温度灵敏度增强。为了分析温度灵敏度增强的原理，通过考虑光纤和涂层层之间的光纤定向应变和力平衡来进行简单的分析。我们的结果表明，相对于单模纤维的Al涂层纤维所获得的温度敏感性与单模纤维的涂层纤维相似。

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