piclist 1998\10\11\223913a >
Thread: how to filter surounding light
face BY : Mark Willis email (remove spam text)

If you use a lens to focus just the light from the area you want to
examine, and use matte black paint inside the focusing assembly (and
keep the lens clean), that should pretty much do it (look into how
astronomers get telescopes to reject surrounding light, basically this
is the same problem on a *very much* smaller scale <G>)

 Mark, mwillisspamspamnwlink.com

M van der Bilt wrote:
{Quote hidden}

<36216B8F.4B6B7C3C@nwlink.com> 7bit

See also: www.piclist.com/techref/logic/dsps.htm?key=filter
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