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Optical fiber random grating-based multiparameter sensor.

Yanping Xu, Ping Lu, Song Gao

|December 2, 2015

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A new fiber-optic sensor uses a femtosecond laser-micromachined random grating for simultaneous temperature, strain, and refractive index measurement. This compact sensor offers an excellent alternative for multifunctional sensing applications.

Area of Science:

Photonics and Sensing Technologies
Optical Fiber Sensors
Nanofabrication

Background:

Multiparameter sensing is crucial for various applications.
Existing fiber-optic sensors often face limitations in compactness and fabrication complexity.
The development of novel sensing structures is essential for advancing measurement capabilities.

Purpose of the Study:

To propose and demonstrate a novel multiparameter fiber-optic sensor.
To achieve simultaneous measurement of temperature, axial strain, and surrounding refractive index.
To leverage femtosecond laser micromachining for sensor fabrication.

Main Methods:

Fabrication of a random grating on an optical fiber using femtosecond laser micromachining.
Utilizing a wavelength-division spectral cross-correlation algorithm to analyze spectral shifts.

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Related Experiment Videos

Last Updated: Mar 29, 2026

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

Writing Bragg Gratings in Multicore Fibers

Writing Bragg Gratings in Multicore Fibers

Published on: April 20, 2016

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

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

Published on: January 7, 2019

Experimental characterization of sensor response to temperature, axial strain, and refractive index variations.

Main Results:

Simultaneous measurement of temperature, axial strain, and refractive index was successfully demonstrated.
Achieved sensitivities of 10.32 pm/°C (temperature), 1.24 pm/με (axial strain), and -1520.6 pm/RIU (refractive index).
The proposed fiber random grating offers high physical strength and simplifies fabrication without a phase mask.

Conclusions:

The developed fiber-optic sensor provides a simple, compact, and robust solution for multiparameter sensing.
Femtosecond laser micromachined random gratings are a promising platform for multifunctional fiber sensors.
The sensor's high sensitivity and simultaneous measurement capability open avenues for advanced monitoring applications.