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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...

Strain and Elastic Modulus

Strain and Elastic Modulus

The quantity that describes the deformation of a body under stress is known as strain. Strain is given as a fractional change in either length, volume, or geometry under tensile, volume (also known as bulk), or shear stress, respectively, and is a dimensionless quantity. The strain experienced by a body under tensile or compressive stress is called tensile or compressive strain, respectively. In contrast, the strain experienced under bulk stress and shear stress is known as volume and shear...

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Related Experiment Video

Updated: May 17, 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

Polymer optical fiber for large strain measurement based on multimode interference.

Jie Huang¹, Xinwei Lan, Hanzheng Wang

¹Department of Electrical and Computer Engineering, Missouri University of Science and Technology, Rolla, Missouri 65409, USA.

|October 18, 2012

Summary

This summary is machine-generated.

A new polymer optical fiber sensor uses multimode interference theory to detect large strains up to 20,000 microstrain. This advanced sensor is ideal for structural health monitoring applications.

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Related Experiment Videos

Last Updated: May 17, 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

Production of a Strain-Measuring Device with an Improved 3D Printer

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Published on: January 30, 2020

Fabrication and Characterization of Disordered Polymer Optical Fibers for Transverse Anderson Localization of Light

Fabrication and Characterization of Disordered Polymer Optical Fibers for Transverse Anderson Localization of Light

Published on: July 29, 2013

Area of Science:

Optoelectronics
Materials Science
Fiber Optics

Background:

Polymer optical fibers (POFs) offer unique advantages for sensing applications.
Structural health monitoring requires robust and sensitive strain detection methods.
Multimode interference (MMI) offers a promising physical principle for optical sensing.

Purpose of the Study:

To develop and demonstrate a novel large strain sensor utilizing polymer optical fiber.
To leverage multimode interference (MMI) principles for strain measurement.
To assess the sensor's performance for structural health monitoring.

Main Methods:

Fabrication of a single-mode-multimode-single-mode fiber structure using POF.
Experimental investigation of the strain sensing mechanism based on MMI.
Characterization of the sensor's dynamic range and detection limit.

Main Results:

Successfully constructed a POF-based MMI strain sensor.
Demonstrated a large dynamic strain sensing range of 2x10^4 με (2%).
Achieved a low detection limit of 33 µε for precise strain measurement.

Conclusions:

The developed POF MMI sensor is effective for large strain detection.
The sensor exhibits excellent performance metrics suitable for structural health monitoring.
This technology presents a viable solution for advanced structural integrity assessment.