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A Random-displacement Measurement by Combining a Magnetic Scale and Two Fiber Bragg Gratings

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Published on: September 30, 2019

Bending sensor based on intermodal interference properties of two-dimensional waveguide array fiber.

S Li¹, Zhi Wang, Y Liu

¹Key Laboratory of Optical Information and Technology, Ministry of Education and Institute of Modern Optics, Nankai University, Tianjin, China.

|May 26, 2012

Summary

This summary is machine-generated.

We developed a sensitive bending sensor using a waveguide array fiber (WAF). This fiber optic sensor shows high sensitivity to bending, making it suitable for various measurement applications.

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Area of Science:

Optics and Photonics
Fiber Optic Sensing

Background:

Intermodal interference in optical fibers offers unique sensing properties.
Mach-Zehnder interferometers (MZI) are sensitive to external perturbations.

Purpose of the Study:

To propose a novel, highly sensitive bending sensor.
To investigate the intermodal interference properties of a waveguide array fiber (WAF) for bending detection.

Main Methods:

Fabrication of a fiber optic sensor using a strongly coupled two-dimensional waveguide array fiber (WAF) between single-mode fibers (SMF).
Utilizing the SMF-WAF-SMF structure as a Mach-Zehnder interferometer (MZI) to analyze intermodal interference.
Characterizing the sensor's response to bending across a wide curvature range.

Main Results:

The sensor exhibits high bending sensitivity due to intermodal interference between supermodes.
A resonance wavelength shift of up to 100 nm was observed within a curvature range of 0-10 m⁻¹.
The bending sensitivity follows a quadratic function of curvature.
Minimal impact of temperature variations on bending measurement precision was noted.

Conclusions:

The proposed WAF-based MZI demonstrates excellent performance for bending sensing.
The device offers high sensitivity and a wide sensing range, suitable for practical applications.
The simple fabrication process and temperature stability enhance its potential for widespread use.