Ms. Mahsa Nemati Profile

Mahsa Nemati

at Technische Univ Delft

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Proceedings Article | 11 September 2012 Paper

Laser speckle analysis of flow in presence of static scatterers

M. Nemati, L. Wei, M. Zeitouny, Marco Stijnen, Sjoerd van Tuijl, N. Bhattacharya, H. Urbach

Proceedings Volume 8413, 84131D (2012) https://doi.org/10.1117/12.978225

KEYWORDS: Speckle, Scattering, Particles, Light scattering, Speckle pattern, Skin, Heart, Blood, Sensors, Blood circulation

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We are developing an experimental setup to characterize dynamic scattering in presence of static scattering. We attempt to retrieve the flow parameters like fluid concentration and velocity in presence of phantoms providing static scattering mimicking the characteristics of skin. Our measurement relies on an optimally-designed optical setup coupled to a high speed detector and the use of appropriate light sources. The flow of particles causes a time varying effect on the speckle pattern which can be measured quantitatively by the speckle contrast term. The speckle contrast is defined as the ratio of standard deviation and mean intensity of speckle variation. Depending on the concentration and velocity of moving particles, the speckle pattern will decorrelate and this results in a drop in the contrast which can also be seen in the recorded images as blurring of the speckle pattern. In literature, measured contrast is related to the velocity and the concentration of the scatterers as it plays a major role in the speckle correlation time (ιc). In our experimental setup we attempt to recover the properties of the moving scatterers in presence of static scatterers. In parallel we present experimental simulations of our experiment comparing it with theoretical studies describing dynamic speckle in presence of static scatterers.

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