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A Simple Optical Sensor Based on Multimodal Interference Superimposed on Additive Manufacturing for Diameter

Victor H R Cardoso^1,2, Paulo Caldas^2,3, Maria Thereza R Giraldi⁴

¹Applied Electromagnetism Laboratory, Federal University of Pará, Rua Augusto Corrêa, 01, Belém 66075-110, Brazil.

Sensors (Basel, Switzerland)

|June 24, 2022

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This study introduces a novel sensor for measuring diameter changes in cylindrical structures, like pipelines and trees. The sensor utilizes a core diameter mismatch technique with a 3D-printed component and a Mach-Zehnder interferometer for accurate monitoring.

Area of Science:

Optical Engineering
Sensor Technology
Materials Science

Background:

Diameter variations in cylindrical structures are crucial for monitoring applications such as oil pipelines and tree radial growth.
Existing methods for diameter measurement may lack sensitivity or practicality for certain applications.

Purpose of the Study:

To propose and experimentally validate a novel sensor for precise diameter change measurement.
To investigate a sensor based on core diameter mismatch technique for monitoring cylindrical structures.

Main Methods:

A sensor was fabricated using a 3D printer and a Mach-Zehnder interferometer (SMF-MMF-SMF configuration).
The sensor's performance was evaluated by fixing it at different points on a printed piece, analyzing spectral shifts due to induced strain and curvature.

Keywords:

SMS diameter monitoring optical sensor optical strain gauge

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Optimization involved creating supports on the printed piece to isolate strain influence.

Main Results:

The sensor demonstrated sensitivity to diameter reduction through shifts in the transmittance spectrum.
Optimized setup focusing on strain yielded good sensitivity and a reasonable dynamic range.
The experimental setup proved to be easily reproducible.

Conclusions:

The developed sensor effectively measures diameter variations in cylindrical structures.
The core diameter mismatch technique offers a viable solution for applications in pipeline monitoring and ecological studies.
The sensor's ease of reproduction and good performance indicate its potential for practical implementation.