基于微型拉锥双芯光子晶体光纤的光纤磁场传感器

Jiansen Ye
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摘要

本文提出了一种具有锥形双芯光子晶体光纤耦合结构的光纤磁场传感器,并进行了实验验证。将磁流体注入光子晶体光纤的两个平行光纤芯之间的空穴中,然后将磁流体渗透到双芯光子晶体光纤的两个光纤芯水平变细。在双芯光子晶体光纤的融合锥端面镀上全反射膜。导光从输入端口传输到光纤的拉锥区域,经过模式耦合后被反射端面反射,最后从输出端口反射到输出光纤。根据上述反射光纤耦合器的光传输方式,研究了双芯光子晶体光纤耦合区注入中频后的磁场测量原理。有效折射率的变化会导致光纤磁场耦合器的中心波长偏移,通过查询传输谱的波长偏移来测量磁场。通过实验对传感器的磁场响应特性进行了研究和分析。实验结果表明,该方法的灵敏度可达116pm/Oe。光纤磁场传感器具有小型化、灵敏度高、无电磁干扰等优点。该磁场传感器可广泛应用于航空、军事、交通、医药等领域的磁场精确测量。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Optic fiber magnetic field sensor based on the miniature pull-taper twin-core photonic crystal fiber
In this paper, a optical fiber magnetic field sensor with the tapered twin-core photonic crystal fiber coupling structure has been presented and experimentally demonstrated. The magnetic fluid(MF) was injected into the air hole between two parallel fiber cores of the photonic crystal fiber, and then the two fiber cores of the twin-core photonic crystal fiber infiltrated with MF were tapered horizontally. A total reflection film was plated on the end face of the fusion cone of the twin-core photonic crystal fiber. The guided light was transmitted from the input port to the pull-cone area of the fiber, reflected by the reflection end face after mode coupling, and finally reflected from the output port to the output fiber. According to the above light transmission mode of reflective fiber coupler, The magnetic field measurement principle was studied, which the coupling region of twin-core photonic crystal fiber had been injected MF. The change of the effective refractive index will lead to the central wavelength shift of the fiber magnetic field coupler, and the magnetic field is measured by inquiring the wavelength shift of the transmission spectrum. The magnetic field response characteristics of the sensor were studied and analyzed through experiments. The experimental results show that the sensitivity of this method can reach 116pm/Oe. The fiber magnetic field sensor has the advantages of miniaturization, high sensitivity, and no electromagnetic interference. The magnetic field sensor can be widely used in the field of aviation, military, transportation, medicine and other fields of magnetic field accurate measurement.
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