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The numerical mirage method for photothermal characterization of materials
Michael T Demko1, Stephen R Hostler, Alexis R Abramson
1Department of Mechanical and Aerospace Engineering, Case Western Reserve University, 10900 Euclid Avenue, Cleveland, Ohio 44106-7222, USA.
The Review of Scientific Instruments
|May 2, 2008
Summary
A new numerical mirage method offers rapid, noncontact thermal characterization using laser beam deflection. This technique accurately determines thermal diffusivity without sample modification, simplifying experiments and expanding capabilities.
Area of Science:
- Materials Science
- Thermal Analysis
- Optics
Background:
- Noncontact thermal measurement techniques are crucial for rapid material characterization.
- Traditional mirage methods can be complex and limited in scope.
- Accurate thermal property determination is essential for material development.
Purpose of the Study:
- To develop a simple and versatile noncontact thermal characterization method.
- To expand the capabilities and simplify the experimental procedure of traditional mirage methods.
- To accurately determine the thermal diffusivity of materials.
Main Methods:
- Development of the "numerical mirage method" utilizing transient photothermal deflection.
- Employing a laser beam to probe a modulated temperature gradient.
- Utilizing a numerical solver for accurate deflection profile modeling and linear curve fitting.
Main Results:
- The numerical mirage method was successfully developed and validated.
- Accurate determination of thermal diffusivity was achieved.
- Good agreement with literature values was obtained for reference samples (bismuth and fused quartz).
Conclusions:
- The numerical mirage method provides a rapid and noncontact approach for thermal characterization.
- This technique simplifies experimental procedures and enhances versatility.
- The method is suitable for various sample and heating configurations, enabling accurate thermal diffusivity measurements.
