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Sound - Ultrasound Scanning.
The difference in time
between emitted and reflected ultrasound
waves
can be used to show how far away the
reflecting surface is
(see range
and direction
finding).
When ultrasound is
directed at the human body,
the surfaces of different tissues
inside the body partly reflect the
ultrasound.
A detector will receive ultrasound echoes at
different times,
depending on how deep inside the
body the tissue surfaces
are.
The detector produces electrical signals which are sent to a
computer
and then displayed on a screen as a
picture.
This is a clever way of "seeing" inside a body
without causing any damage.
Ultrasound scans can
safely be used to see an image of a developing
baby
inside the uterus of a pregnant mother.
This is called "fetal imaging" or
"pre-natal scanning"
and is useful to show if the baby is
healthy.
A similar
technique can be used in industry
to show cracks or flaws inside metal
objects.
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