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. Author manuscript; available in PMC: 2021 Apr 1.
Published in final edited form as: IEEE Trans Ultrason Ferroelectr Freq Control. 2019 Nov 28;67(4):801–809. doi: 10.1109/TUFFC.2019.2956463

Fig. 7.

Fig. 7.

Photoacoustic signal captured from a pencil lead target shows ~320 mV peak-to-peak amplitude, after 39 dB gain at the preamplifier stage. The frequency response of the photoacoustic pulse shows a ~6.75 MHz center frequency with ~89% bandwidth.