Xiao Yueyu, Cheng Jiayao
Key Laboratory of Specialty Fiber Optics and Optical Access Networks, Shanghai University, Shanghai 200444, China.
Institute of Fiber Optics, Shanghai University, Shanghai 201800, China.
Sensors (Basel). 2024 Dec 6;24(23):7805. doi: 10.3390/s24237805.
A highly sensitive sensor, which can detect the temperature and strain simultaneously, is proposed using a hollow-core anti-resonant fiber with composite nested tubes. The sensing fiber contains two kinds of nested tubes, and two different sensing mechanisms, the resonance coupling effect and the intermodal interference, are realized in the same section of a hollow-core anti-resonant fiber fully filled with ethanol. Five conjoined nested anti-resonant tubes are introduced to suppress the confinement loss of the higher-order mode LP. One hybrid conjoined nested tube, which consists of a half-circular anti-resonant tube and a half-circular resonant tube, is introduced to induce a resonant coupling between the LP mode in the core and the dielectric mode in the nested resonant tubes. Numerical investigations demonstrate the shifts of the feature wavelengths of the resonance coupling effect, and the intermodal interference shows different velocities with temperature and strain, while a simultaneous measurement of temperature and strain can be realized with high sensitivities (3.36 nm/°C and -0.003 nm/με to temperature and strain, respectively). Since the sensor can be fabricated by full infiltration with liquid into the large-size core and cladding tubes of hollow-core anti-resonant fibers, and special post-processing, such as selective infiltration or coating, is notneeded. The proposed sensors based on hollow-core anti-resonant fibers with functional liquid infiltration provide a more efficient and versatile platform for the temperature and strain sensing.
提出了一种使用带有复合嵌套管的空心反谐振光纤的高灵敏度传感器，该传感器能够同时检测温度和应变。传感光纤包含两种嵌套管，并且在完全充满乙醇的空心反谐振光纤的同一截面中实现了两种不同的传感机制，即谐振耦合效应和模式间干涉。引入五个相连的嵌套反谐振管以抑制高阶模式LP的限制损耗。引入一种由半圆形反谐振管和半圆形谐振管组成的混合相连嵌套管，以在纤芯中的LP模式与嵌套谐振管中的介电模式之间引发谐振耦合。数值研究表明了谐振耦合效应特征波长的偏移，并且模式间干涉在温度和应变下呈现出不同的速度，同时可以实现对温度和应变的高灵敏度同步测量（分别为3.36 nm/°C和-0.003 nm/με ）。由于该传感器可以通过将液体完全渗透到空心反谐振光纤的大尺寸纤芯和包层管中来制造，并且不需要诸如选择性渗透或涂层等特殊后处理。所提出的基于功能液体渗透的空心反谐振光纤传感器为温度和应变传感提供了一个更高效、更通用的平台。
