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From: Chuck Simmons
Organization: You jest.
X-Mailer: Mozilla 4.61 [en] (X11; U; Linux 2.0.33 i586)
Subject: Re: Deflecting laser beam 90
Date: Sat, 28 Sep 2002 18:17:28 GMT
NNTP-Posting-Date: Sat, 28 Sep 2002 11:17:28 PDT
Glenn Gundlach wrote:
> firstname.lastname@example.org (Bob Wilson) wrote in message news:...
> > In article ,
> > KILOWATT"nospam"@SOFTHOME.NET says...
> > >
> > >Hi everyones. It's to protect a very small area
> > >with the beam of an ordinary laser pointer.
> > >I need a way to deflect it's beam by 90=B0 but cannot
> > >figure how since my knowledge in optics is limited.
> > >
> > >With a small piece of mirror it's easy to bring back
> > >the beam to toward the laser source...(at or near 180=B0)
> > >but at the angle of 90=B0...hmmmmm..????????????????
> > >TIA
> > >--
> > What's the problem? A mirror angled at 45 degrees will defect light a=
t a 90
> > degree angle. The fact that it is laser light is utterly irrelivant. =
> > is light.
> > Bob.
> Everybody talks of mirrors and of course are correct, but nobody has
> talked about maintaining the alignment. I presume the idea is to do 3
> bounces and detect activity at all 4 sides of the crib. Keeping
> everything precisely aligned will be an engineering exercise all by
> itself. I'd like to see mama at 4AM when she goes to get the baby and
> trips the alarm. Simplify your life. Lose the alarm and close the door
> with the cat out of the room.
There is a way.
V cube corner |
If the colimated laser beam is made an inch or so in diameter, the
sensitivity of the return beam to alignment is small because of the cube
corner. Basically, for ideal alignment. you adjust to hit the cube
corner in the center.
... The times have been, =
That, when the brains were out, =
the man would die. ... Macbeth =
Chuck Simmons email@example.com
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