"DaFiend" wrote in news:1107310913.876953.310020
@o13g2000cwo.googlegroups.com:

Hi, i'm new to Alt.lasers, so bear with me, i'm unfamiliar w*ith the
setup of this forum, to be honest i find the google forums h*ard to
negotiate.I usually hang out at CPF, which was linked to her*e. Any
way, that getting OT.
What i wanted to bring up, was Skyline i read your email exc*hange
with the APSA, and was very impressed. Is there any way to includ*e the
Amount of the "reflected" beam that would reflected off the* cockpit
widows them selves? If not, Would you be able to include a r*efrence
to this?

BTW, it's "Skywise".

The genereal rule of thumb for the reflection off uncoated glass
at normal incidence (that is, not at an angle) is 4% per surface.
Not sure what it would be for the material actually used in
aircraft, but I doubt it's much different. It also will change
according to the angle of incidence, namely more reflection.
There could also be a small effect do to polarization. Different
polarizations reflect differently at shallow angles.

Before including such numbers in my calcs, I'd need real world
figures of reflection for the materials in use and their
dimensions and numebr of layers to be of much use.

But then, I'm not sure it would be worth the effort. Perhaps
other optics experts coudl comment?


Now i know that you guys have probably seen this:
http://www.lumalaser.com/redbaron.htm many times, but it relates to
this topic entirely. I don't know who's side of the debate i*t works
best for though

Oh yeah. We've been all over that. Do remember they were
dealing with a slow moving plane at very low altitude.

Brian
--
http://www.skywise711.com - Lasers, Seismology, Astronomy

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