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Characterization of the CFT-UT prototype. (a, b) Simulated and measured impedance and phase spectra of the CFT-UT. (c) Pulse-echo signal on a quartz plate. (d) Pulse length measurement of the detected ultrasound echo signal. PL, pulse length. (e) Frequency response of pulse-echo signal. (f) Frequency bandwidth measurement of the CFT-UT in the pulse-echo mode.
