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From: "Frithiof Andreas Jensen"
Subject: Re: Deflecting laser beam 90°
Date: Mon, 30 Sep 2002 11:46:59 +0200
References: <3D94749D.82FBE140@imit.kth.se> <firstname.lastname@example.org> <email@example.com> <3D94AF9C.C6503CF2@webaccess.net>
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"KILOWATT" wrote in message
> Thanks very much for your reply Ban...even if you only have a tortoise
> Cheap >1mW lasers are inoffensive to the eye in way that the
> natural reaction of closing eyelid (even for Sasha,my cat! ;-) )
"Cheap" implies "Nasty" - the power regulation in most laser pointers is
There were tests done her in the DK when the laser pointers hit the street
and the kids were using them against anything with eyes - the power could
vary from less than 1 mW to a whopping 5 mW, even within the same brand.
I would use one of the circuits from "optical gate" application notes from
Natsemi, Philips or Siemens...If you a want a visual "laser-light" effect,
there is no harm in using a high-intensity LED with a collimating lens.
...Or a web-cam with motion detection software - one could then build some
target-aquisition and tracking software to whack the cat with a water gun
for increased nerd-value (and some entertainment ;-)
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