KEYWORDS: Photoacoustic spectroscopy, Monte Carlo methods, Sensors, Acoustics, Remote sensing, Reconstruction algorithms, 3D modeling, Photoacoustic tomography, Signal detection, Algorithm development
Remote photoacoustic tomography by speckle-analysis which is based on the measurement of the surface tilt is interesting for a lot of medical applications such as endoscopy or wound imaging. In this work, a new model which is capable to simulate the resulting surface tilt after photoacoustic excitation is presented. A Monte Carlo simulation is coupled to a stress simulation which allows the determination of the temporal surface deformation and the resulting tilt. A first comparison to experimental results from literature is done and discussed. In future, this model might help to optimize the speckle-sensing technique for photoacoustic signal detection. Furthermore, it could be used to develop and test image reconstruction algorithms.
This document shows the theory and set-up of a non-contact measurement strain gauge, which measures translation
and strain of a mechanically or thermally loaded specimen. The measurement gauge basically consists of
a light source emitting a collimated monochromatic laser beam illuminating the specimen and two CMOS line-
scan cameras, which are arranged symmetrically about the incident laser beam picking up speckled reflection.
The cameras are recording the granular laser speckles in specific time-intervals and the subsequent images are
processed by an algorithm1 implemented in GNU C. As a result one obtains accurate information about changes
in the state of strain and rigid body translation the specimen undergoes2 . Furthermore experimental results are
introduced. The dilatation of a piezo-stack, the elastic modulus of a thin copper wire and the elastic modulus
of a soldering joint are investigated.
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