Full text loading...
(Color online) (a) Experimental set-up for passive sensing of the water interface with CMUT ring array. (b) Recorded noise power spectrum vs. DC bias voltage levels applied to CMUT terminals.
(Color online) (a) Superimposed broadband (5-25 MHz) cross correlation waveforms computed from 1 s long ambient noise recordings from sensors 1 and 2 (see Fig. 1(a)) for two different water heights. (b) Time frequency representation of the same cross correlation waveform (red dashed line) obtained when the water height is 1.5 mm. The colorscale is logarithmic (dB) and normalized to the maximum value displayed.
(Color online) (a) Experimental set-up for both active and passive ultrasonic imaging of a scatterer centered 1.3 mm above CMUT ring array. (b) Passive ultrasonic imaging of this scatterer using thermal-mechanical noise cross-correlation waveforms. (c) Conventional ultrasonic imaging of the same scatterer using pulse echo waveforms. The colorscale is logarithmic (dB) and each figure was normalized to its maximum displayed value.
Article metrics loading...