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Micro/Nano-scale Strain Distribution Measurement from Sampling Moiré Fringes
Published on: May 23, 2017
Thermal strain measurement by one-beam laser speckle interferometry
Applied Optics
|March 18, 2010
Summary
This study used one-beam laser speckle interferometry to measure thermal strain in aluminum. The technique successfully captured transient strain fields with high-quality fringe patterns, validating its effectiveness.
Area of Science:
- Materials Science
- Optical Metrology
- Solid Mechanics
Background:
- Transient thermal strain fields are critical for understanding material behavior under rapid heating.
- Accurate measurement of these fields is challenging due to dynamic effects and environmental interference.
Purpose of the Study:
- To apply one-beam laser speckle interferometry for measuring transient thermal strain fields.
- To evaluate the technique's efficacy in analyzing localized heating effects on an aluminum plate.
Main Methods:
- Utilized a one-beam laser speckle interferometry setup.
- Employed a ruby pulse laser to minimize thermal air turbulence effects.
- Heated a small region of an aluminum plate to induce transient thermal strain.
Main Results:
- Obtained high-quality isothetic fringe patterns representing the strain distribution.
- Successfully measured transient thermal strain fields in the aluminum plate.
- Experimental results showed good agreement with existing data.
Conclusions:
- One-beam laser speckle interferometry is a viable method for measuring transient thermal strain.
- The use of a pulsed ruby laser enhances measurement accuracy by reducing environmental noise.
- The technique provides reliable data for validating material behavior models.
