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Measurements of Strain

Measurements of Strain

Strain quantifies the deformation of a material under force, typically measured as normal strain, which represents the change in length when compared with the original length. Electrical strain gauges are used for enhanced accuracy. These devices consist of a conductive wire mounted on a paper backing that adheres to the material's surface. These gauges operate on the piezoresistive effect, where the wire's electrical resistance changes in response to mechanical deformation. The strain gauge...

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Related Experiment Video

Updated: May 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

All-fiber, long-active-length Fabry-Perot strain sensor.

Simon Pevec¹, Denis Donlagic

¹University of Maribor, Faculty of EE & Computer Science, Smetanova 17, SI-2000 Maribor, Slovenia.

|September 22, 2011

Summary

This study introduces a novel all-fiber Fabry-Perot strain sensor offering high sensitivity and low temperature dependence. Its cost-effective manufacturing and precise measurement capabilities advance fiber optic sensing technology.

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Last Updated: May 29, 2026

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Area of Science:

Fiber Optic Sensors
Optical Metrology
Materials Science

Background:

Traditional strain sensors often face limitations in sensitivity, temperature stability, and production scalability.
Developing robust, high-performance fiber optic sensors is crucial for advanced structural health monitoring and industrial applications.

Purpose of the Study:

To present a novel all-silica, all-fiber Fabry-Perot strain sensor with enhanced performance characteristics.
To demonstrate a cost-effective manufacturing method suitable for high-volume production.
To validate the sensor's high sensitivity and broad measurement range.

Main Methods:

Micro-machining of a specialized sensor-forming fiber to create the Fabry-Perot cavity.
Direct splicing of the sensor fiber to standard lead-in fibers.
Utilizing a commercial, multimode fiber-based signal processor for strain measurement.

Main Results:

Achieved a high strain resolution better than 1 microstrain (µε).
Demonstrated a wide measurement range exceeding 3000 µε.
The sensor exhibits low intrinsic temperature sensitivity and a long active length.

Conclusions:

The developed all-fiber Fabry-Perot strain sensor offers a promising solution for high-precision strain monitoring.
The micro-machining and splicing technique facilitates cost-effective, scalable manufacturing.
This sensor technology has significant potential for applications requiring accurate and stable strain measurements.