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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...

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: Mar 3, 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

High Precision Temperature Insensitive Strain Sensor Based on Fiber-Optic Delay.

Ning Yang¹, Jun Su², Zhiqiang Fan³

¹School of OptoElectronic information, University of Electronic Science and Technology of China, Chengdu 610054, China. ningchenluck@126.com.

Sensors (Basel, Switzerland)

|May 5, 2017

Summary

This summary is machine-generated.

This study presents a fiber-optic delay strain sensor that precisely measures strain by detecting optical delay changes. Its design offers high accuracy and temperature insensitivity for practical structural health monitoring.

Keywords:

elastic coefficient fiber-optic delay strain sensor temperature insensitive

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Last Updated: Mar 3, 2026

A Random-displacement Measurement by Combining a Magnetic Scale and Two Fiber Bragg Gratings

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Published on: September 30, 2019

Fiber Optic Distributed Sensors for High-resolution Temperature Field Mapping

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

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Published on: January 7, 2019

Area of Science:

Optoelectronics
Fiber Optics
Sensor Technology

Background:

Traditional strain sensors often suffer from temperature cross-sensitivity.
Accurate and robust strain measurement is crucial for structural health monitoring.

Purpose of the Study:

To develop and analyze a novel fiber-optic delay based strain sensor.
To achieve high precision and temperature insensitivity in strain measurement.

Main Methods:

Theoretical analysis of fiber-optic delay elastic properties.
Measurement of the elastic coefficient (3.78 ps/km·με).
Implementation of a reference path to mitigate temperature effects and use of an optical fiber stretcher for testing.

Main Results:

Demonstrated low strain error despite temperature fluctuations.
Achieved a high strain sensitivity of 4.75 με within a 350 με range.
Validated the sensor's feasibility, practicality, and cost-effectiveness.

Conclusions:

The fiber-optic delay strain sensor is a practical solution for accurate strain measurement.
The sensor's design allows for quasi-distributed measurements for long-distance structural monitoring using wavelength division multiplexing.