Shadowgraph imaging is a powerful optical technique for visualizing density gradients in transparent media. In the context of measuring thermal conductivity, shadowgraph imaging can be employed to study the behavior of heat flow in various materials. By capturing the way light is refracted by these density variations, valuable insights into the thermal properties of the material can be obtained. In our recent work, to investigate the thermal conductivity of biological tissues in presence of nanostructures, shadowgraph imaging has been employed with the aim of software implementation of lock-in amplification.
Photoacoustic viscoelasticity is a cutting-edge technique that combines the principles of photoacoustics and mechanical wave propagation to assess the viscoelastic properties of materials. By inducing acoustic waves through light absorption and analyzing their propagation, this method enables the characterization of the mechanical behavior of samples. We have delved into the application of photoacoustic viscoelasticity for the non-destructive evaluation of biological entities, offering a novel approach to studying their viscoelastic properties. We employed this innovative technique for two kind of samples; Bacterial colonies and the Brain tissue (for Autism Spectrum Disorder).
The presentation will provide a comprehensive overview of the fundamentals, methodologies and findings related to both techniques.


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