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

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

Published on: September 30, 2019

Temperature- and phase-independent lateral force sensor based on a core-offset multi-mode fiber interferometer.

Bo Dong¹, Da-Peng Zhou, Li Wei

¹Department of Physics and Computer Science, Wilfrid Laurier University, Waterloo, Ontario, Canada. dbo1978@163.com

|July 8, 2009

Summary

A new lateral force sensor uses a core-offset multi-mode fiber interferometer. This sensor shows high extinction ratio sensitivity, is independent of temperature and phase, and offers a simple, low-cost design for various applications.

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Area of Science:

Optoelectronics and Photonics
Fiber Optic Sensors

Background:

Interferometric sensors are crucial for precise measurements.
Existing fiber optic sensors can be sensitive to environmental factors like temperature.

Purpose of the Study:

To develop a novel lateral force sensor with enhanced stability and sensitivity.
To explore the application of core-offset multi-mode fiber interferometers for force sensing.

Main Methods:

Fabrication of a multi-mode fiber interferometer with a core-offset fused section between single-mode and multi-mode fibers.
Application of lateral force to a section of the multi-mode fiber.
Monitoring changes in extinction ratio and interference phase.

Main Results:

A high extinction ratio was achieved through controlled misalignment.
Lateral force variations directly correlated with changes in extinction ratio.
The sensor demonstrated phase-independency and temperature-insensitivity.
The sensor exhibited good repeatability and high sensitivity.

Conclusions:

The core-offset multi-mode fiber interferometer is a promising platform for robust lateral force sensing.
The sensor's temperature- and phase-independent characteristics offer significant advantages.
Potential applications include fiber filters and tunable phase-independent attenuators.