High-sensitivity fiber SPR strain sensor based on n-type structure

Author:

Wei Yong,Ren Puxi,Liu Chunlan,Tang Yixiong,Zhang Ziqiang,Liu Chunbiao,Shi Chen,Liu Zhihai1

Affiliation:

1. Harbin Engineering University

Abstract

At present, fiber strain sensors are mainly of the grating type and interference type, while there is relatively little research on fiber surface plasmon resonance (SPR) strain sensors. In this Letter, we propose a highly sensitive fiber SPR strain sensor based on an n-type structure. The strain changes the shape of the fiber n-type structure, causing the transmission mode of light in the fiber to change, thereby changing the SPR incidence angle and causing the SPR resonance valley wavelength to shift, achieving highly sensitive SPR strain sensing. The test results indicate that the strain sensing sensitivity of the proposed sensor reaches 21.33 pm/µε, and two n-type structures are connected in series to obtain a double n-type structure, further enhancing the strain sensing sensitivity to 33.44 pm/µε. This fiber strain sensor has advantages of high sensitivity, low temperature cross talk, strong structural stability, and low production cost, and is expected to become a new solution for wearable intelligent monitoring equipment and strain sensors in the aerospace field.

Funder

Foundation of Intelligent Ecotourism Subject Group of Chongqing Three Gorges University

Open Project Program of Key Laboratories of Sensing and Application of Intelligent Optoelectronic System in Sichuan Provincial Universities

Open Project Program of Chongqing Key Laboratory of Development and Utilization of Genuine Medicinal Materials in Three Gorges Reservoir Area

Fundamental Research Funds for Chongqing Three Gorges University of China

Open Project Program of Chongqing Key Laboratory of Geological Environment Monitoring and Disaster Early-Warning in Three Gorges Reservoir Area

Science and Technology Project Affiliated to the Education Department of Chongqing Municipality

National Natural Science Foundation of China

Publisher

Optica Publishing Group

Subject

Atomic and Molecular Physics, and Optics

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