Skip to main content
. 2016 Aug 6;16(8):1248. doi: 10.3390/s16081248

Figure 8.

Figure 8

Pulse-echo waveforms and their spectra measured from the press-focused transducer before the lens casting process (a) and the double-focused transducer fabricated in this study (b). The solid line indicates the magnitude of the spectrum and the dotted line is the pulse-echo waveform.