[sdiy] DIY Optical organs.

[Scott Gravenhorst]

I work on large disk drives years ago.  Some smaller types had optical
positioning  sensors.  These used a grain of wheat bulb.  The light passed
through a glass with black ink and a clear slit, then to a graticle that
moves with the heads.  The graticle marks defined where the tracks on the
disk are.

Tony Clark <clark at andrews.edu> wrote:
>   Hi,
>
>> Anyone tried laser printing waveforms onto acetate? I'm not expecting =
>> hi-fi results. :)
>
>   No I haven't tried doing waveforms, but I did try to make a linear 
>encoder once, using the same trick.  The problem that I ran into is that 
>it greatly depends on your light source, I think.  In order to pick up on 
>that fine of a resolution, your source/pickup needs to be extremely 
>narrow.  I found that once the lines got so fine, the bleed-through got to 
>be too excessive.
>   Anyone else care to add anything?
>
>   Cheers,
>
>   Tony
>
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>"We wouldn't want to ship something that doesn't work"
>   - Carl Stork, general manager, Microsoft Windows division
>     Excerpt from EE Times April 2, 2001
>

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