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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...

Design Example: Strain Gauge Bridge or Wheatstone Bridge

Design Example: Strain Gauge Bridge or Wheatstone Bridge

The utilization of strain gauges as transducers for converting mechanical strain into electrical signals is a common practice in various engineering applications. These strain gauges are frequently integrated into Wheatstone bridge circuits to accurately measure parameters such as force or pressure. Within this context, each element within the circuit exhibits a resistance that undergoes subtle variations when subjected to mechanical strain. The primary objective is to convert minuscule...

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Related Experiment Video

Updated: Jul 14, 2026

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

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

Published on: January 30, 2020

Composite-cavity-based Fabry-Perot interferometric strain sensors.

Jianzhong Zhang¹, G D Peng, Libo Yuan

¹Department of Physics, Harbin Engineering University, Harbin 150001, China. zhangjianzhong@hrbeu.edu.cn

|July 3, 2007

Summary

A novel composite-cavity Fabry-Perot interferometric sensor minimizes temperature cross-sensitivity while enabling high multiplexing capability. This strain sensor system utilizes white-light interferometry for accurate demodulation, demonstrating its practical application.

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Last Updated: Jul 14, 2026

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Area of Science:

Optics and Photonics
Materials Science
Sensor Technology

Background:

Fabry-Perot interferometers are sensitive to strain but often suffer from temperature cross-sensitivity.
Multiplexing multiple sensors in a single system is challenging, limiting practical applications.
Accurate strain measurement is crucial in various engineering and scientific fields.

Purpose of the Study:

To propose a composite-cavity-based Fabry-Perot interferometric strain sensor system.
To achieve minimum cross-sensitivity to temperature and high multiplexing capability simultaneously.
To demonstrate the feasibility of the proposed sensor system.

Main Methods:

Fabrication of a composite-cavity Fabry-Perot structure.
Interrogation of the sensor system using white-light interferometric technology.
Demodulation of the strain signal by analyzing coherence spectra.

Main Results:

The proposed sensor system demonstrated significantly reduced cross-sensitivity to temperature.
High multiplexing capability was achieved, allowing for multiple sensors to be interrogated.
A two-sensor demonstration system was successfully built and tested.

Conclusions:

The composite-cavity Fabry-Perot interferometric strain sensor offers a promising solution for accurate and multiplexed strain measurements.
The developed white-light interferometric interrogation technique effectively demodulates the strain signal.
This technology has potential applications in structural health monitoring and precision engineering.