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S-type fiber surface plasmon resonance strain sensor.

Yong Wei, Chen Shi, Xiaoling Zhao

|October 18, 2022

Summary

This study introduces a novel S-type fiber optic sensor for precise strain measurement using surface plasmon resonance (SPR). The sensor demonstrates a sensitivity of -14.38 pm/µε, offering a new solution for engineering and health monitoring applications.

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Area of Science:

Optoelectronics
Fiber Optics
Sensor Technology

Background:

Surface plasmon resonance (SPR) sensors are primarily used for refractive index detection.
There is limited research on utilizing SPR sensors for strain measurement applications.

Purpose of the Study:

To propose and demonstrate a novel S-type fiber optic strain sensor based on SPR.
To investigate the relationship between S-type fiber geometry and SPR characteristics for strain sensing.

Main Methods:

Fabrication of an S-type structure on single-mode fiber via electrofusion.
Excitation of high-order cladding modes and subsequent SPR generation using a gold film.
Analysis of resonance wavelength shifts in response to applied strain.

Main Results:

The S-type fiber geometry influences the SPR incidence angle and working band.
The fabricated sensor achieved a sensitivity of -14.38 pm/µε over a strain range of 0-1200 µε.
Resonance wavelength shifted from 648.06 nm to 631.77 nm under tested conditions.

Conclusions:

The developed S-type fiber SPR sensor offers a new method for accurate strain measurement.
The sensor shows potential for applications in engineering, health monitoring, and early warning systems.