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. Author manuscript; available in PMC: 2019 Jul 12.
Published in final edited form as: Proc IEEE Sens. 2018 Dec 27;2018:10.1109/ICSENS.2018.8589733. doi: 10.1109/ICSENS.2018.8589733

Fig. 5.

Fig. 5

Experimental setup for photoacoustic imaging (PAI). (a) Schematic diagram of PAI experimental setup using PMUTs. (b) Picture of the setup showing the agarose gel phantom, PMUTs array, light-guide, and embedded pencil lead targets, (c) Photoacoustic A-line signal detected by the PMUT element after 39 dB gain, from a pencil lead placed ~2.3 cm away, on excitation by the laser source. The inset shows the frequency response of the photoacoustic pulse with center frequency of ~7 MHz and approximately 68% fractional bandwidth.