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. Author manuscript; available in PMC: 2007 Oct 10.
Published in final edited form as: IEEE Trans Ultrason Ferroelectr Freq Control. 2006 Jan;53(1):126–136. doi: 10.1109/tuffc.2006.1588398

Fig. 4.

Fig. 4

PCD measurements (13-MHz receiver) for a 4.6-MHz, seven-cycle, 0.95-MPa peak rarefactional pressure excitation. (a) Time waveform. (b) Corresponding time-frequency spectrogram.