Notes for JoVE 4.4.1 and 4.5.1 screen captures

The software we use displays both time (as in 4.4.1) and frequency (4.5.1) domains, so although the emphasis for the two sections is different, a consistent display format is used. The time domain display is on the left, and frequency domain is on the right.

4.4.1 	Time Domain Monitoring [JoVE 4.4.1 screen capture.mp4]
t=0	 The video begins with waveform generator off (no ultrasound)
t=7s	The waveform generator is turned on with a 1 MHz drive level large enough to produce ultrasound that causes bubble collapse and broadband noise seen on the PCD. 
t=10s	PCD signal exceeds range of digitiser (some of the signal appears cut off in the time domain display). 
t=14s	The digitiser range is increased from 200 to 800mV (see upper left corner of window), eliminating any signal clipping.
The subsequent signals are fairly consistent out to at least t = 30s, so it would be fine to stop the video there if not sooner.

4.5.1	Frequency Domain Monitoring 	 [JoVE 4.5.1 screen capture.mp4]
t=0	 The video begins with waveform generator off (no ultrasound)
t=3s	The waveform generator is turned on with a 1 MHz drive level large enough to produce ultrasound that causes bubble collapse and broadband noise seen on the PCD. 
t=10s	The waveform generator is turned off, and the drive level is reduced to primarily generate harmonics (2, 3, 4 ... MHz) and ultraharmonics (1.5, 2.5, 3.5 ... MHz).
t=17	The waveform generator is turned back on at the reduced drive level, and the desired harmonic and ultraharmonic spectrum lines are seen.
The subsequent signals are fairly consistent out to at least 37s, so it would be fine to stop the video there if not sooner.