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. 2018 Nov 21;18(11):4081. doi: 10.3390/s18114081

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© 2018 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Simulated photoacoustic (PA) response using COMSOL. (A) The simulated PA signals with different intervals between the two arms of the fiber bundle. The intensity of the PA signal with a 14-mm interval was 3.35-fold larger than the PA signal with a 22-mm interval. (B) The X-Z plane time sequence snapshots of the PA wave field at 4 representative time points in 1% Lipofundin. When the target received a Gaussian light pulse (peak time at 30 ns), the PA wave started to generate from the surface of the target and propagated outward in the scattering medium.