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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: Oct 13, 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

Large-range phase-difference sensing technology for low-frequency strain interrogation.

Jinhui Shi, Dong Guang, Shili Li

|November 15, 2021

Summary

This summary is machine-generated.

This study introduces a novel phase-difference sensing technology (PDST) scheme for complete low-frequency strain measurement. The method overcomes phase range limitations, enabling accurate recovery of larger strain signals for applications like seismic monitoring.

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Related Experiment Videos

Last Updated: Oct 13, 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

Micro/Nano-scale Strain Distribution Measurement from Sampling Moiré Fringes

Micro/Nano-scale Strain Distribution Measurement from Sampling Moiré Fringes

Published on: May 23, 2017

Intermediate Strain Rate Material Characterization with Digital Image Correlation

Intermediate Strain Rate Material Characterization with Digital Image Correlation

Published on: March 1, 2019

Area of Science:

Optoelectronics
Fiber Optic Sensing
Strain Measurement

Background:

Phase-difference sensing technology (PDST) is used for strain measurement but is limited by its phase-difference measurement range.
The inherent (0, pi) range limitation of PDST hinders complete measurement of low-frequency strain signals.

Purpose of the Study:

To propose a novel scheme that achieves completeness in PDST for low-frequency strain interrogation.
To overcome the measurement range limitation of PDST and enable recovery of larger phase amplitudes.

Main Methods:

The proposed scheme utilizes dual-interferometers.
An elliptic-fitting algorithm is employed for data processing.
A phase compensation setting is implemented to break the (0, pi) measurement range limitation.

Main Results:

The experimental results demonstrate the successful acquisition of low-frequency strain signals.
The scheme effectively recovers low-frequency strain signals with phase amplitudes exceeding pi.
The method proves to be an efficient and complete approach for low-frequency optical fiber strain measurement.

Conclusions:

The developed scheme provides a complete and efficient solution for low-frequency strain measurement using PDST.
This technology has potential applications in seismic wave monitoring and rock deformation detection.