h a l f b a k e r y
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Any of you who have done some welding,
or tried to make charcoal using a giant
Fresnel lens, knows this: very bright
things can hurt your eyes. Very dark
glasses can prevent this, but with them
on, all you can see is the bright spot -
everything else is too dark. Thus welders
their mask up and down in the
course of work to make sure they are
actually still welding what they want to
weld. Fresnel lens users ... well, that is
The BVG are like night vision goggles in
that they produce an image of the world
an image similar to that on the view
screen of your camera or phone. The
image has a maximum brightness for any
object, and so looking through them, the
bright spot simply looks flat white. You
can see other things around it.
There may be a little magic to this. It
be that a camera lens has the same
failings as an eye as regards bright
One approach to this would be to have
very dark filter as used in welders
then augment the image as is done in
night vision goggles. This would
a colorless image similar to night vision
Automatic Welding Helmets
The conventional solution to this problem. [jutta, Feb 05 2006]
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||This is somewhat similar to the dark spot windshield glass that several people have proposed over the years, but I think the technology is at least plausible. Croissant (having done some glass welding in my time).
||Possibly redundant as there are welding masks that darken quickly when you start to weld. (I haven't used them but am told they work well). I find that the bright light from the weld allows you to see the surroundings once you start. But, yes, a reduction in contrast would be good. I've tried welding in full sunlight and found I could see well with the mask down. Another way to reduce the range of brightness. Well thought out. +
||I've used those - worked well for me. It's easier for a beginner if you don't have to battle your mask all the time.