�From:�	Martin Schmitz, BT (SCHMITZ)
�To:�		sowacs@aqua.ccwr.ac.za
�Date:�	Wednesday, May 8, 1996  12:35 pm
�Subject:�	re TDR,Radar,shockwave

Hi listmembers,

Bruce commented:
"...Is TDR just high frequency radar
(the reflection of shockwaves?)
I think not. Explanations... "

Let me try one...
There is a similarity between Radar and
acoustical shockwaves in the way that
both spread by similar physical 
principals. Both are damped by material
properties and can be reflected at layers
of different material properties: in the
 case of Radar the dielectric constant,
with shockwaves density and others.

TDR is different in the way that the waves
are guided along the electrodes and are
reflected at their end while the other
waves travel freely in the material.

TDR mesures the average material
properties between the electrodes, while
Radar and shockwaves detect 'sharp'
changes in material properties.

So I see the stronger similarity between
shockwaves and Radar.

Think about (military)
submarines/aeroplanes:
what they do with their active sonar/
active Radar is very similar.

best regards
:-) Martin