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. Author manuscript; available in PMC: 2013 Sep 16.
Published in final edited form as: Ultrasonics. 2011 Nov 11;52(4):497–502. doi: 10.1016/j.ultras.2011.11.001

Fig. 6.

Fig. 6

Time domain pulse/echo response and normalized frequency spectrum of the first element of the annular array.(The X-cut quartz target was about 5 mm away from the array; The -6dB bandwidth of the signal is 90%.)