3B SCIENTIFIC PHYSICS U10010 Manuel De L'utilisateur page 17

4.7. Time dependent amplification
The plate used in 4.6 can also be used to demonstrate
the time-dependent amplification method that is of-
ten employed, particularly in medicinal applications.
The rise time, threshold and start point of the ampli-
fier can all be adjusted so that the individual echoes
all appear to be of equal magnitude. The time-depend-
ent amplifier thus compensates for the attenuation in
the material. Variations in width and point of action
can emphasize areas at different depths or even filter
certain depths out. An example is shown in the follow-
ing diagram.
The damping visible in the display above is just about
eliminated with the time-dependent amplification set-
tings used in the display below.
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