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

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Nearshore Contamination Monitoring in Sandy Soils Using Polymer Optical Fibre Bragg Grating Sensing Systems.

Sina Fadaie¹, Moura Mehravar¹, David John Webb¹

¹College of Engineering and Physical Sciences, Aston University, Birmingham B4 7ET, UK.

Sensors (Basel, Switzerland)

|July 27, 2022

Summary

A new polymer optical fibre Bragg grating (POFBG) sensor accurately detects soil salinity. This innovation aids structural health monitoring and protects coastal infrastructure from corrosion and groundwater contamination.

Keywords:

contaminated soil health monitoring nearshore geo-structures polymer optical fibre Bragg grating

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Last Updated: Sep 3, 2025

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Area of Science:

Civil Engineering
Materials Science
Environmental Monitoring

Background:

Civil engineering assets face deterioration in corrosive environments, especially near coastal zones.
Salinity contamination from seawater intrusion threatens infrastructure and freshwater resources.
Accurate structural health monitoring is crucial for asset safety and longevity.

Purpose of the Study:

To investigate a novel polymer optical fibre Bragg grating (POFBG) sensor for detecting soil salinity.
To assess the sensor's performance in representative soil environments with varying salinity and water content.
To provide a practical tool for precise salinity measurement in soil.

Main Methods:

Utilized a novel polymer optical fibre Bragg grating (POFBG) sensor.
Conducted experiments in soil with varying water content and salinity levels.
Measured sensor response to assess sensitivity and accuracy.

Main Results:

The POFBG sensor demonstrated a sensitivity of 58 ± 2 pm/% to salinity.
Achieved an average standard error of 0.43% for salinity measurements across different soil water contents.
Validated the sensor's effectiveness in a representative soil environment.

Conclusions:

The developed POFBG sensor is a promising tool for high-precision salinity detection in soil.
This technology can significantly enhance structural health monitoring of coastal infrastructure.
The sensor contributes to safeguarding groundwater resources in coastal areas.