多模光纤
光学
材料科学
渐变折射率纤维
纤维
光纤传感器
光纤
流离失所(心理学)
保偏光纤
物理
复合材料
心理学
心理治疗师
作者
Chunlan Liu,Ping Wu,Chen Shi,Chunbiao Liu,Yong Wei,Lei Hu,Rui Wang,Tianci Jiang
标识
DOI:10.1016/j.optcom.2022.129095
摘要
Based on the self focusing characteristics of graded index multimode fiber, a fiber SPR micro displacement sensor can be constructed, which has two bottleneck problems of difficult to fabricate and the small displacement detection range. In this paper, we proposed and constructed a new heterocore structure of grade multimode fiber-single-mode fiber-grade multimode fiber to realize the micro displacement sensing, which has stable performance and simple fabrication. By increasing the core diameter of modulation graded multimode fiber and displacement fiber, the displacement detection range of probe was increased. The simulating and testing results indicate that the SPR micro displacement sensor based on the graded multimode heterogeneous core structure can well realize the two-parameter sensing of micro displacement, and its average wavelength and light intensity sensitivity can reach 1.23 nm/ μ m. And 0.00576 a.u./ μ m respectively, the measurement resolution is 0 . 813 μ m . When using step multimode fiber with core diameter of 40 μ m in place of single-mode fiber as the displacement fiber the displacement detection range reaches 50 μ m which is double that of the reported fiber SPR micro displacement sensor. The proposed fiber SPR micro displacement sensor well solved the two bottleneck problems above, which can be used in the field of micro displacement measurement of structural health monitoring.
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