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Related Experiment Video

Updated: May 31, 2025

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

High-Performance Optical Fiber Displacement Sensor with Extended Linear Range and Sensitivity.

Gorka Zubia^1,2, Joseba Zubia^3,4, Josu Amorebieta⁵

¹Department of Graphical Expression and Project Engineering, University of the Basque Country, 48013 Bilbao, Spain.

Sensors (Basel, Switzerland)

|January 25, 2025

Summary

This summary is machine-generated.

We developed a new fiber optic displacement sensor design using a pentafurcated bundle. This optical fiber displacement sensor (OFDS) offers improved range and sensitivity for precise measurements in challenging environments.

Keywords:

aeronautical sensing displacement sensor intensity-modulated optical sensor optical fiber bundle design optical fiber sensor structural health monitoring tip clearance tip timing

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Last Updated: May 31, 2025

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Area of Science:

Optoelectronics and Photonics
Sensor Technology
Mechanical Engineering

Background:

Optical Fiber Displacement Sensors (OFDSs) offer advantages like compactness and electromagnetic immunity, making them suitable for confined spaces.
Fiber bundle geometry critically impacts OFDS performance, including sensitivity, range, and dead zones.

Purpose of the Study:

To present a streamlined design methodology for azimuthally symmetric OFDSs.
To enhance the linear range and sensitivity of OFDSs through optimized fiber bundle configurations.

Main Methods:

Proposed a pentafurcated fiber bundle design: one central transmitting fiber and four concentric rings of fibers.
Investigated the impact of fiber geometry on sensor performance parameters.
Conducted experimental validation of the proposed design.

Main Results:

The pentafurcated design significantly increased the sensor's range up to 10.5 mm.
Achieved enhanced sensitivity of 2 mm⁻¹ with the optimized configuration.
Minimized the sensor's dead zone to 2.5 mm for accurate short-distance measurements.

Conclusions:

The streamlined design methodology effectively improves OFDS performance.
The pentafurcated fiber bundle configuration represents a significant advancement in OFDS technology.
This optimized OFDS is suitable for accurate measurements in applications with limited space and access.