re: general laser babble

["Smith, Kirby A" <kirby.a.smith@lmco.com>]

"Joseph F. Governali" <jfgovern@mailbox.syr.edu> included in his report on
jamming laser radars:

The absolute BEST METHOD OF CLOAKING THE CAR WAS TO MOUNT A
LARGE (PAR 46) OFF-ROAD LAMP ON THE FRONT BUMPER, APPROXIMATELY CENTERED,
MOUNTED WITH AN INFRA-RED FILTER!!!!!  
........
	The parts for this project can be had cheaply at your local NAPA
store...  The only part that I'm not sure about is the IR-Pass filter.
The magazine mentioned that you could get the filter from most scientific
supply companies...  
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Suitable glass filter material is made by Schott, among others, and would
run around $50 for a 2 inch piece from the supply companies.  Enough for a
large lamp might be expensive, although surplus companies may have
appropriate material.  Lower cost gels from Kodak would be unsuitable in
rain and heat.  However, depending on the actual wavelength of the laser, to
get good transmission at the laser radar detector's filter passband, there
will be leakage in the visible, such that operation at night might reveal a
red glow.  A truly covert, but seriously expensive solution would be to use
a powerful laser diode with diverging optics to cover the desired field of
regard.

                .... Kirby   (Kirby A. Smith)
                              2 x 1988 90q
                          New Hampshire USA