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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...

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Updated: Jun 12, 2026

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

Grating speckle method for in-plane displacement measurement.

M Tu, J McKelvie, F L Dai

|June 18, 2010

Summary

A novel technique combines lensless speckle photography and a grid method for precise in-plane displacement measurement. This simple, high-sensitivity approach offers low-noise, high-contrast results without needing vibration isolation.

Area of Science:

Optical Metrology
Solid Mechanics
Experimental Stress Analysis

Background:

Accurate measurement of in-plane displacement is crucial for understanding material behavior under load.
Existing techniques may require complex setups or vibration isolation, limiting their practical application.

Purpose of the Study:

To propose and demonstrate a high-sensitivity technique for measuring in-plane displacement.
To develop a method that is simple, robust, and suitable for various environments.

Main Methods:

Combines lensless speckle photography with a high-frequency grid technique.
Contact specklegrams are captured before and after loading in a double exposure mode using white light.
Optical processing is employed to extract displacement components.

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Using Digital Image Correlation to Characterize Local Strains on Vascular Tissue Specimens

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Main Results:

The technique achieves high sensitivity, adjustable by grid frequency.
Low-noise fringe patterns with high contrast are obtained.
The method demonstrated suitability for mechanical laboratory and field applications.

Conclusions:

The proposed technique offers a simple and effective solution for in-plane displacement measurement.
Its robustness and lack of need for vibration isolation enhance its practical utility.
This method advances optical metrology for mechanical testing.