Ultrasound

Ultrasound

1. is a sound with a higher frequency than humans can hear (20-20,000 Hz

   • Electrical sustems can be made which produce electrical oscillations of any frequency.
     • Can be converted into mechanical vibrations to produce sound waves.

2. Partial Reflection

   • is when a wave passes from one medium into another some waves are reflected off the boundary between the two media and some is transmitted.
     • So you can pint a pulse of ultrasound at any object and wherever there are boundaries between one substance and another some of the ultrasound gets refracted back
       • The time it takes for the reflections to reach a detector can be used to measure how far away the boundary is
   • Is how ultrasoung imaging works

3. Finding Boundaries

   • S=V X T
     • S= distance in m
     • V= speed in m/s
     • T= time in s
   • Oscilloscope Traces can be used to find boundaries
     • Shows an ultrasound pulse reflectinf off two separate boundaries