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Experimental and image-inversion optimization aspects of thermal-wave diffraction tomographic microscopy.

L Nicolaides, A Mandelis

|May 2, 2009

Summary

Thermal-wave Slice Diffraction Tomography (TSDT) offers non-destructive imaging of sub-surface defects in opaque materials. A new high-resolution setup improves defect detection accuracy for enhanced material analysis.

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Area of Science:

Materials Science
Non-destructive Testing
Optical Imaging

Background:

Conventional tomography is ill-posed for thermal wave problems.
Sub-surface defect detection in opaque solids requires advanced imaging.
Photothermal techniques offer potential for near-surface analysis.

Purpose of the Study:

To develop and validate an improved Thermal-wave Slice Diffraction Tomography (TSDT) technique.
To enhance the resolution and accuracy of sub-surface defect imaging.
To address the ill-posed nature of thermal wave reconstruction.

Main Methods:

Utilized photothermal tomographic microscopy to gather experimental data.
Employed Tikhonov regularization and the L-curve method for numerical inversion and optimization.
Developed a new high-resolution radiometric setup for improved image quality.

Main Results:

Generated cross-sectional thermal diffusivity images of materials.
Successfully resolved multiplicity of solutions inherent in ill-posed problems.
Demonstrated reduced image broadening compared to previous low-resolution setups.

Conclusions:

The enhanced TSDT technique provides high-resolution imaging of near-surface defects.
The L-curve method effectively optimizes solutions for ill-posed thermal wave problems.
The new radiometric setup significantly improves defect detection capabilities.