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Optical-fiber Fabry-Perot embedded sensor.

C E Lee, H F Taylor, A M Markus

|September 18, 2009

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An embedded optical-fiber sensor in composite material accurately measures temperature. This fiber optic sensor shows a lower response in the composite than in air, enabling thermal expansion coefficient estimation.

Area of Science:

Materials Science
Optical Engineering
Sensor Technology

Background:

Optical-fiber sensors offer precise measurement capabilities.
Integrating sensors into composite materials presents unique challenges and opportunities.
Fabry-Perot interferometers are suitable for high-sensitivity optical sensing.

Purpose of the Study:

To embed an optical-fiber Fabry-Perot interferometer into a graphite-epoxy composite.
To evaluate the performance of the embedded sensor for temperature monitoring.
To determine the thermal expansion coefficient of the composite material.

Main Methods:

An optical-fiber Fabry-Perot interferometer was embedded within a graphite-epoxy composite.
The sensor's response was characterized over a temperature range of 20 to 200 degrees C.

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Last Updated: Jun 20, 2026

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

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Published on: January 7, 2019

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Published on: February 3, 2023

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

Phase shift changes were measured to determine temperature sensitivity and thermal expansion.

Main Results:

The embedded sensor demonstrated reliable temperature sensing from 20 to 200 degrees C.
A temperature sensitivity of 8.0 x 10(-6)/ degrees C was measured for the embedded sensor.
The sensor exhibited a 4% lower response in the composite compared to an air ambient, allowing for thermal expansion coefficient estimation.

Conclusions:

An embedded optical-fiber Fabry-Perot interferometer can function as an effective temperature sensor within composite materials.
The reduced sensitivity in the composite provides a method for characterizing material thermal expansion.
This technique offers a pathway for integrated structural health monitoring in composite applications.