基于具有TCF-PCF结构的新型马赫-曾德尔干涉仪的高灵敏度应变传感器。

Highly Sensitive Strain Sensor Based on a Novel Mach-Zehnder Interferometer with TCF-PCF Structure.

作者信息

Dong Xinran, Du Haifeng, Luo Zhi, Duan Ji'an

机构信息

State Key Laboratory of High Performance Complex Manufacturing, College of Mechanical and Electrical Engineering, Central South University, 932 South Lushan Street, Changsha 410083, China.

出版信息

Sensors (Basel). 2018 Jan 18;18(1):278. doi: 10.3390/s18010278.

A highly sensitive strain sensor based on a novel fiber in line Mach-Zehnder interferometer (MZI) was demonstrated experimentally. The MZI was realized by splicing a section of photonic crystal fiber (PCF) with the same length of thin core fiber (TCF) between two single mode fibers (SMFs). The fringe visibility of MZI can reach as high as 20 dB in air. In particular, the strain sensitivity of -1.95 pm/με was achieved within a range from 0 to 4000 με. Furthermore, the strain properties of different length of MZI was investigated. It was found that the sensitivity was weekly dependent on the length of MZI. The strain sensitivities corresponding to the MZI with 35 mm PCF, 40 mm PCF and 45 mm PCF at 1550 nm band were -1.78 pm/με, -1.73 pm/με and -1.63 pm/με, respectively. Additionally, the sensor has advantages of simple fabrication, compact size and high sensitivity as well as good fringe visibility.

实验展示了一种基于新型光纤在线马赫-曾德尔干涉仪（MZI）的高灵敏度应变传感器。该MZI通过在两根单模光纤（SMF）之间熔接一段与薄芯光纤（TCF）长度相同的光子晶体光纤（PCF）来实现。MZI在空气中的条纹可见度可达20 dB之高。特别是，在0至4000 με的范围内实现了-1.95 pm/με的应变灵敏度。此外，研究了不同长度MZI的应变特性。发现灵敏度对MZI的长度依赖性较弱。在1550 nm波段，对应于PCF长度为35 mm、40 mm和45 mm的MZI的应变灵敏度分别为-1.78 pm/με、-1.73 pm/με和-1.63 pm/με。此外，该传感器具有制作简单、尺寸紧凑、灵敏度高以及条纹可见度良好等优点。