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Pulses of ultrasound are incident on a quartz crystal. This makes the crystal oscillate, and these oscillations of the crystal generate voltage pulses across it. The voltage pulses are amplified and processed to give a trace (series of spikes) on a cathode ray oscilloscope (C.R.O.) screen.
The specific acoustic impedances of the air and skin are very different, and when there is a large difference between the acoustic impedances of the two media, the intensity reflection coefficient for the boundary between the two media would be nearly equal to 1. This implies that most of the ultrasound approaching such a boundary would be reflected, so there would be little transmission.
Therefore, since there is a large difference between the acoustic impedances of air and skin, there would be very little transmission of ultrasound waves from air into skin.
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for the boundary between the two media would be nearly equal to 1. This implies that most of the ultrasound approaching such a boundary would be reflected, so there would be little transmission.
