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3 March 2014 Source-receiver photoacoustic wave interferometry
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The representation theorems of the convolution type and the correlation type are used to obtain the superposition of the Green's function and its time reversal counterpart for the photoacoustic wave equation. Based on the representation theorems, an interferometry relation providing the Green's function between sources and receivers is obtained. The reciprocity theorems for a spherical geometrical system consisting of sources located on the boundary of the inner spherical region and transducers located on the outer boundary are utilized. Therefore, the measurement would be observed at one of the detectors if there were a photoacoustic point source at the other one.
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Hakan Erkol, Aytac Demirkiran, Esra Aytac-Kipergil, Nasire Uluc, and Mehmet B. Unlu "Source-receiver photoacoustic wave interferometry", Proc. SPIE 8943, Photons Plus Ultrasound: Imaging and Sensing 2014, 89435B (3 March 2014); doi: 10.1117/12.2038999;

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