High-Density Weak In-Fiber Micro-Cavity Array for Distributed High-Temperature Sensing with Millimeter Spatial Resolution
High-Density Weak In-Fiber Micro-Cavity Array for Distributed High-Temperature Sensing with Millimeter Spatial Resolution
复制标题
用于毫米空间分辨率分布式高温传感的高密度弱光纤内微腔阵列
DOI：
10.1109/jlt.2022.3201055
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发表时间：
2022
影响因子：
4.7
通讯作者：
Yiping Wang
中科院分区：
文献类型：
--
作者：
Bin Du;Jun He;Baijie Xu;Xizhen Xu;Cailing Fu;Pengfei Li;Xunzhou Xiao;Shen Liu;Yatao Yang;Yiping Wang
高温下的高空间分辨率分布式传感在许多工业领域中至关重要，例如航空发动机、核能、熔炉和燃料电池。在这里，我们提出并展示了一个大规模的复用高密度弱光纤微腔（MC）阵列的分布式高温传感毫米空间分辨率。利用飞秒激光逐点刻刻法在普通单模光纤（SMF）中形成两个弱反射器，构成了一个具有100 03 BC;m短腔长和223 C; -55 dB低峰值反射率的本征法布里-珀罗干涉仪（IFPI）的光纤内微腔。利用不同的飞秒激光脉冲能量制备了多个高密度的微通道阵列，这些微通道阵列由相同的弱IFPI组成，IFPI数超过1000，研究了微通道阵列的传输损耗。实验结果表明，单个微扰引起的TL可低至0.0009dB。此外，通过在室温和100000 B 0;C之间循环加热和冷却来研究MC的高温性能，显示出-2.29 GHz 002 F; 00 B 0;C的温度敏感性（即，18.4 pm002F;00B0;C）。利用光频域反射解调技术，实现了光纤内MC阵列的分布式高温传感，在100000 ℃的高温下获得了1 mm的高空间分辨率。因此，所提出的高密度弱光纤MC阵列适用于恶劣环境下的分布式高温传感，在航空航天、核电、冶金、电化学等领域具有广阔的应用前景。
High-spatial-resolution distributed sensing at high temperature is crucial in many industrial areas, such as aero-engines, nuclear power, furnaces, and fuel cells. Here, we propose and demonstrate a large-scale multiplexed high-density weak in-fiber micro-cavity (MC) array for distributed high-temperature sensing with millimeter spatial resolution. The proposed in-fiber MC, featured by an intrinsic Fabry-Perot interferometer (IFPI) with a short cavity length of 100 03BC;m and a low peak reflectivity of 223C; -55 dB, was formed by two weak reflectors created in a conventional single-mode fiber (SMF) by using femtosecond laser point-by-point inscription. Several high-density MC arrays, consisting of identical weak IFPIs over 1000, were fabricated by using different femtosecond laser pulse energy to investigate the transmission loss (TL) of MC arrays. The experimental result shows that the TL induced by a single MC could be low as 0.0009 dB. Moreover, the high-temperature performance of the MCs was studied via cyclic heating and cooling between room temperature and 100000B0;C, showing a temperature sensitivity of -2.29 GHz002F;00B0;C (i.e., 18.4 pm002F;00B0;C). Furthermore, distributed high-temperature sensing was demonstrated by employing the fabricated in-fiber MC array with the demodulation of optical frequency domain reflectometry, and a high spatial resolution of 1 mm was achieved at a high temperature of 1000 00B0;C. As such, the proposed high-density weak in-fiber MC arrays are suitable for distributed high-temperature sensing in harsh environment, and hence have wide prospection of application in the fields of aerospace, nuclear power, metallurgy, and electrochemical industry.