https://doi.org/10.1051/epjconf/202226610022
Practical limits and opportunities with speckle metrology
Luleå University of Technology, 97187 Luleå, Sweden
* Corresponding author: mikael.sjodahl@ltu.se
Published online: 13 October 2022
In this presentation, the role of speckles as a carrier of information in phase-based optical metrology is re-visited. Starting with the fundamental mechanisms for speckle decorrelation it is shown that information about the state of an object is transferred through the modified mutual coherence function and can be detected either through the phase, speckle movement, speckle decorrelation or as a combination. The presentation is focusing on practical scale laws that set the limit for what is possible to achieve with present day technology and is demonstrated with a few examples incorporating measurements of microstructural changes, strain, shape, lenses and other refractive index objects.
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