Re: CCD

Hi,

CCD devices sound expensive - I saw an article a while ago (can't remember
where though) in which someone was using ordinary EPROMs as CCD devices.
Apparently they work well enough to be able to get a recognizable black and
white picture from although, of course, it is grainy due to the limitation
on pixel numbers. Still, it might be good enough for this purpose and EPROMs
are so easily available in scrapped equipment that it may be worth while
looking at them as a source of sensors. From what I remember, you read them
continually and the cells on which light has fallen report a lower value
proportional to the light's intensity (grey scale value) or something.

Ian
--
Ian W. Wright
Sheffield UK

----- Original Message -----
From: Arne Chr. Jorgensen <instel@...>
To: <CAD_CAM_EDM_DRO@onelist.com>
Sent: 20 September 1999 00:40
Subject: [CAD_CAM_EDM_DRO] CCD


> From: "Arne Chr. Jorgensen" <instel@...>
>
> Hi, I have read a bit more.....
>
>
> Jon, you top the cake !!! << Damn Heisenberg !! >> I got in
> serious trouble after that - so my advice - don't try to drink any
> coffee while you read it !
>
> About the CCD, - yes, I have had the same thoughts. But most of
> the CCD's I know of, has a serial output. I tried something with a
> 1024 pixel area, but before I got any results, - I fried the
> piece. I had planned to get a smaller one, 128 bits - but the
> problem is still the serial interface.
> But what I was thinking - is like a nonier ? scale . ( I don't know
> if I spell that right )
> Process the bits in parallel. Maybe it could be broken down to a
> just some TTL gates, a 16 to 4 decoder, -- you know in what
> direction I am thinking.
>
> There is also some small detectors with 4 integrated sensors, used
> for position lenses in laser heads, etc.
>
> If you forget your plotter, and just think of an 8mm film. It should
> be possible to make something more accurate, don't you think ?
>
> file://ARNE
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