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Updated: Apr 28, 2026

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

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Published on: September 30, 2019

Fiber-optic ground settlement sensor based on low-coherent interferometry.

Pinglei Zhang, Heming Wei, Xuefeng Zhao

|June 13, 2014

Summary

This summary is machine-generated.

A new fiber-optic method uses a Michelson interferometer and liquid-filled chambers for precise ground settlement monitoring. This technique achieves micrometer accuracy, crucial for infrastructure like high-speed railways.

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Last Updated: Apr 28, 2026

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

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A Silicon-tipped Fiber-optic Sensing Platform with High Resolution and Fast Response

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Published on: January 7, 2019

Area of Science:

Civil Engineering
Geotechnical Engineering
Optical Metrology

Background:

Ground settlement monitoring is essential in civil engineering.
Current millimeter-accuracy instruments are insufficient for specialized applications like high-speed railways.
Achieving micrometer-scale accuracy is challenging due to sensor stability during slow settlement.

Purpose of the Study:

To propose a fiber-optic ground settlement monitoring methodology.
To achieve micrometer-scale measurement accuracy for ground settlement.
To address the limitations of existing ground settlement monitoring technologies.

Main Methods:

A scanning low-coherent Michelson interferometer was employed.
A liquid surface within an interferometer path enabled micrometer-scale measurements.
Hydraulically connected chambers measured differential settlement or heave via liquid level changes.

Main Results:

The fiber-optic methodology demonstrated potential for micrometer-scale ground settlement monitoring.
Experimental results showed a best accuracy of ±20 μm for ground settlement monitoring.
A reference compensation sensor contributed to achieving high accuracy.

Conclusions:

The proposed fiber-optic Michelson interferometer system offers a viable solution for high-accuracy ground settlement monitoring.
This method is suitable for critical infrastructure requiring precise deformation measurements.
Further development could enhance stability and applicability in diverse environmental conditions.