Zhu Xiaojun, Chen Feijie, Zhuang Haoran, Qian Jiayi, Liu Hai, Cao Juan, Shi Yuechun, Wang Xia, Wu Wuming
School of Microelectronics and Integrated Circuits (Jiangsu Key Laboratory of Semi. Dev. & IC Design, Package and Test), Nantong University, Nantong 226019, China.
School of Information Science and Technology, Nantong University, Nantong 226019, China.
Micromachines (Basel). 2024 Nov 27;15(12):1427. doi: 10.3390/mi15121427.
We present a high-sensitivity curvature and strain Mach-Zehnder interferometer (MZI) fiber sensor based on a configuration of no-core fiber (NCF) and four-core fiber (FCF). We used an optical fiber fusion splicer to directly splice a segment of FCF between two segments of NCF, with both the FCF and NCF made of SiO, where the FCF exhibits multi-path interference characteristics that allow for higher sensitivity. The NCF, with its self-focusing property, excites higher-order modes, which split and transmit it into the four cores of the FCF. The experimental results show that within a curvature range of 0.0104 m-0.1515 m, the maximum sensitivity can reach -78.04 dB/m with a high linear value of ~0.99. Additionally, the strain response is also experimentally studied. In the range of 0-600 με, the maximum strain sensitivity is -6.49 pm/με. The sensor demonstrates high curvature and strain sensitivity, indicating its potential applications in sensing measurements.
我们展示了一种基于无芯光纤（NCF）和四芯光纤（FCF）配置的高灵敏度曲率和应变马赫-曾德尔干涉仪（MZI）光纤传感器。我们使用光纤熔接机将一段FCF直接熔接在两段NCF之间，FCF和NCF均由SiO制成，其中FCF呈现多路径干涉特性，可实现更高的灵敏度。具有自聚焦特性的NCF激发高阶模式，这些模式分裂并传输到FCF的四个芯中。实验结果表明，在曲率范围为0.0104 m - 0.1515 m内，最大灵敏度可达-78.04 dB/m，线性度高达~0.99。此外，还对应变响应进行了实验研究。在0 - 600 με范围内，最大应变灵敏度为-6.49 pm/με。该传感器展示出高曲率和应变灵敏度，表明其在传感测量中的潜在应用。
