RE: general laser babble

[HAREST@allenbrook.iix.com]

I too had this info stored from years back.  However, by the time I'd gotten
off my butt to implement this, Edmund's had discontinued that particular
item.  Not sure what the filtering range of this discontinued filter was,
but I believe laser is in the 908nm range.  Allowing that range through, and
filtering out the visible is the general desire.

They still make similar glass IR filters (730-1100nm), however the size is
12mm dia (#46082) or 25mm square (#46086) for $17.75 and $32.70
respectively.  Don't think I want to patch together a larger area of filter
from such small pieces, and I'm not sure if a single small opening in a
driving light cover would suffice?  Anyone care to speculate?

They do have plastic IR filters (gels) in larger sizes.  5.5" square
(#43951) and 4"x5" (#43954) for $24.50 and $11.75 respectively.  These pass
700-2200nm.  These have a thickness of 1.5mm so I'm not sure how resistant
to heat they will be.  Perhaps sandwiching a filter between some plexi will
work?  Speculation anyone?  This isn't my field, but I'm interested in
making it work. One laser ticket is enough thanks!

Perhaps some other scientific suppliers will have something similar.  Anyone
care to investigate?  I didn't have much luck when I looked into it earlier
this year.  Most have some small but incredibly expensive pieces only...

Later,
-S

Stott Hare
85 Callaway 4ktq
84 4ktq (MC conversion in progress) 


-----Original Message-----
From: frankbauer@thevine.net
Sent: Thursday, September 10, 1998 9:10 PM
To: quattro@coimbra.ans.net
Subject: general laser babble


joe sez:
>...
>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...
>...
>    If I can help provide any info on the above, gimmie a yell..
>...

i have a note here taken from a post from several years that say that
edmunds scientific (609-573-6250) sells a 5-3/8" diameter IR filter
(#A60033) for $39.95.
not sure how accurate or up-to-date this info is...

frank

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