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Updated: Jul 14, 2026

Design and Fabrication of an Optical Fiber Made of Water

Design and Fabrication of an Optical Fiber Made of Water

Published on: November 8, 2018

Extrinsic Fabry-Perot cavity optical fiber liquid-level sensor.

Tao Lü¹, Suping Yang

¹School of Mathematics and Physics, China University of Geosciences, Wuhan, China. lvtaohn@126.com

|June 1, 2007

Summary

This study presents a novel optical fiber liquid-level sensor using a Fabry-Perot (FP) cavity. The sensor achieves high accuracy and stability for continuous liquid level monitoring, even in hazardous areas.

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Area of Science:

Optoelectronics
Fiber optic sensing
Instrumentation

Background:

Accurate liquid-level measurement is crucial in various industrial applications.
Traditional sensors may face limitations in hazardous environments.
Optical fiber sensors offer potential advantages due to their immunity to electromagnetic interference.

Purpose of the Study:

To propose and demonstrate a novel optical fiber liquid-level sensor.
To achieve high accuracy and long-term stability in liquid-level measurements.
To enable continuous monitoring in explosive and flammable environments.

Main Methods:

An extrinsic Fabry-Perot (FP) cavity sensor was designed.
The FP cavity was constructed using a single-mode optical fiber and an elastic silicon layer.

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Liquid pressure variations were used to modulate the FP cavity length and detect phase shifts.

Main Results:

The sensor demonstrated an accuracy of 2 mm over a 3.5 m range for water level measurement.
High accuracy and long-term stability were achieved under ambient temperatures (10-38 °C).
The sensor design incorporated self-compensated steps for enhanced performance.

Conclusions:

The developed optical fiber liquid-level sensor is effective for continuous and accurate measurements.
The sensor is suitable for use in explosive and flammable environments.
This technology offers a robust solution for challenging liquid-level sensing applications.