dc wrote:
> The range is short but moreover IR is directional.
this should be replaced by:
"IR is needs to be very directional otherwise the range is very short"
Physics demands that range and directionality are related:
a laser can be extremely directional and the range can go to the moon
and back (in extreme cases), while a non-directional beam drops
off as 1/r**2 with distance, so it won't go far.
Gerhard
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Gerhard Fasol, PhD Eurotechnology Japan K. K.
http://www.eurotechnology.com/
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Received on Mon Nov 11 06:25:10 2002