In-Fiber Mach-Zehnder Interferometer Based on Three-Core Fiber for Measurement of Directional Bending
In-Fiber Mach-Zehnder Interferometer Based on Three-Core Fiber for Measurement of Directional Bending
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DOI：
10.3390/s19010205
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发表时间：
2019-01-01
期刊：
影响因子：
3.9
通讯作者：
Zeng, Zhongliang
中科院分区：
文献类型：
--
作者：
Ding, Lei;Li, Yu;Zeng, Zhongliang
提出了一种基于三芯光纤马赫-曾德尔干涉仪(MZI)的高灵敏度定向弯曲传感器。这种基于MZI的弯曲传感器是通过在两个芯偏移的单模光纤(SMF)之间熔接一段TCF而制成的。由于磁芯在TCF中的位置，应用于基于TCF的MZI的弯曲会导致磁芯的伸长或缩短，这使得传感器适合于定向弯曲测量。为了分析弯曲特性，研究了两种基于TCF的传感器，它们的熔接铁芯位于SMF之间的不同位置。测量技术中采用了扫频源。实验结果表明，两种传感器在0度弯曲方向上的弯曲灵敏度分别为15.36 nm/m(-1)和3.11 nm/m(-1)，在180度弯曲方向上的弯曲灵敏度分别为-20.48 nm/m(-1)和-5.29 nm/m(-1)。两种传感器的温度灵敏度分别为0.043 nm/℃和0.041 nm/℃。该传感器结构紧凑，用途广泛，制作成本低廉，有望在生物医学传感领域具有潜在的应用前景。
A highly sensitive directional bending sensor based on a three-core fiber (TCF) Mach-Zehnder interferometer (MZI) is presented in this study. This MZI-based bending sensor was fabricated by fusion-splicing a section of TCF between two single-mode fibers (SMF) with core-offset. Due to the location of the core in the TCF, a bend applied to the TCF-based MZI led to an elongation or shortening of the core, which makes the sensor suitable for directional bending measurement. To analyze the bending characteristics, two types of TCF-based sensors, with the fusion-spliced core located at different positions between the SMFs, were investigated. A swept source was employed in the measurement technique. The experimental results showed that, for the two types of sensors in this setup, the bending sensitivities of the two sensors were 15.36 nm/m(-1) and 3.11 nm/m(-1) at the bending direction of 0 degrees, and -20.48 nm/m(-1) and -5.29 nm/m(-1) at the bending direction of 180 degrees. The temperature sensitivities of the two sensors were 0.043 nm/degrees C and 0.041 nm/degrees C, respectively. The proposed sensors are compact, versatile, inexpensive to fabricate, and are expected to have potential applications in biomedical sensing.