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Subject: Re: Laser Pointer Project
X-Newsreader: Forte Agent 1.92/32.572
Date: Wed, 04 Dec 2002 14:55:04 -0500
NNTP-Posting-Date: Wed, 04 Dec 2002 14:55:10 EST
Organization: Bell Sympatico
On 4 Dec 2002 10:45:04 -0800, Thorfirstname.lastname@example.org (P!erCer)
>Here is my plan:
>1) Take a cheap laser pointer
>2) Mount a tiny speakers (or coneless speaker drivers...what are they
>called?) to the front of the pointer, perpendicular to each other.
>3) Play tones through the speakers and watch the cool patterns.
Two speakers with the cone replaced by small plastic mirrors . Feed
the laser pointer and the two modified speakers with the audio from
the output of the audio amplifier .
Point the laser to the first mirror and the first mirror to the second
mirror that will project a modulated circle with variable diameter if
the power ratio applied to the two mirror is correct.
You cam also vibrate the mirrors with separate channels (stereo) and
modulate the laser with the sum or the difference of the two channels.
Have always the first mirror (physically smaller and less power
required) projecting on the second mirror (larger)
You have many possible combinations.
What about color ?
>1) Make or install my own tone generators so that I don't need to use
>two sound cards and a computer. Variable ones would be best.
>2) Install an additional oscillator to the on off switch to make the
>laser flash. Is this possible/good for lasers? Would I need to make
>a square wave?
>And here is my question(s):
>#1) What kind of drivers would work well to vibrate the laser? Tiny
>speaker, like the kind in headphones, were my first thought, but they
>really aren't made to move that much mass. I could just use plain
>electromagnets...with permanent magnets mounted to the outside of the
>laser. That could work, but it would add even more mass that must be
>moved. Perhaps...a mirror instead? I could fire the laser at the
>mirror, and jiggle the mirror around. The mirror would have to move
>in funny ways, though...rotate, not jiggle. Perhaps two magnets
>mounted on the back of the mirror and some kind of center pivot would
>do the trick...
>Thanks for your time,
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