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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: Aug 25, 2025

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

Optical Strain Gauge Prototype Based on a High Sensitivity Balloon-like Interferometer and Additive Manufacturing.

Victor H R Cardoso^1,2, Paulo Caldas^2,3, Maria Thereza R Giraldi⁴

¹Applied Electromagnetism Laboratory, Federal University of Pará, Rua Augusto Corrêa, 01, Belém 66075-110, Brazil.

Sensors (Basel, Switzerland)

|October 14, 2022

Summary

This study presents a novel optical strain gauge using a balloon-like interferometer for precise displacement measurement. The compact, low-cost sensor offers high sensitivity, making it ideal for structural monitoring applications.

Keywords:

3D printer balloon-shaped diameter measurement displacement sensor strain sensor

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Last Updated: Aug 25, 2025

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

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Fabrication and Implantation of Miniature Dual-element Strain Gages for Measuring In Vivo Gastrointestinal Contractions in Rodents.

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Published on: September 18, 2014

Area of Science:

Fiber optics
Optical sensing
Interferometry

Background:

Traditional strain gauges can be limited by factors such as cost, size, and environmental sensitivity.
Developing compact, cost-effective, and highly sensitive displacement sensors is crucial for structural health monitoring.

Purpose of the Study:

To present and demonstrate a novel optical strain gauge based on a balloon-like interferometer structure.
To evaluate the sensor's performance for displacement and strain measurements.

Main Methods:

Fabrication of a balloon-like interferometer using a bent standard single-mode fiber and a 3D-printed component.
Utilizing the interference between core and cladding modes induced by fiber curvature for sensing.
Interrogating sensor response through wavelength shift or intensity change.

Main Results:

The optical strain gauge demonstrated a sensitivity of 55.014 nm/mm for displacement measurements from 0 to 10 mm.
A strain sensitivity of 500.13 pm/μϵ was achieved.
The sensor exhibits a simple, compact design with easy fabrication and repeatability.

Conclusions:

The developed optical strain gauge is a viable and cost-effective solution for measuring structure displacement.
The sensor's performance characteristics make it suitable for various structural monitoring applications.
The core-cladding mode interference principle offers a robust sensing mechanism.