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4 March 2013 On the sensor influence in photoacoustic signal produced by point-like source
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In order to explore the influence of a finite sensor on the detected photoacoustic pressure, we used the solution of the photoacoustic wave equation for a point-like source to simulate the pressure detected by a flat circular sensor. The sensor was simulated by a mesh of point-like sensors connected in parallel. First, we studied the shape of the photoacoustic pressure when sensor discretization was varied. The artifacts in the predicted pressure decreased as discretization size increased. The above implies that the adequate modeling of pressure depends on the discretization size. Pressure detection at different positions with respect to the sensor location was considered. In this sense we simulated a point-like source located at different positions over an axis in the center of the sensor perpendicular to the sensing surface. We also simulated the behavior of the photoacoustic pressure taking a fixed coordinate system and exploring the variations in the translational and rotational degrees of freedom for the source-sensor system. We found that simulated pressure from the proposed approach for the finite sensor clearly differs from the point-like detection model.
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C. A. Bravo-Miranda, A. González-Vega, and G. Gutiérrez-Juárez "On the sensor influence in photoacoustic signal produced by point-like source", Proc. SPIE 8581, Photons Plus Ultrasound: Imaging and Sensing 2013, 858144 (4 March 2013);

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