Post by thread:Eprom eraser

Wagner Lipnharski wrote: > Just take extra care to never look at the light, it can create severe > problems at your eyes retinae. Actually Wagner, it is not so much the retinae that are at risk. The UV is absorbed quite well be the stuff in between, such as the cornea, lens and vitreous humour. Trouble is, it "cooks" them on the way through! Also the sclera (white capsule of the eye) and conjunctiva (lining on the surface of all but the cornea). "Welding Flash" and later, cataracts are the most notable effects. I'll ask someone about retinopathy though. Better approximation on the Ozone. If I recall this correctly, Oxygen absorbs UV which breaks it into free radicals. These attach to O2 molecules to become O3 (Ozone). These are however even more inclined to absorb UV, so the Ozone is a good absorber. As Eric Oliver has mentioned to me in passing, the theory goes that free Fluorine and to a lesser extent Chlorine catalyse the Ozone rapidly back into Oxygen and reduce its absorption, but this is in hot dispute. FWIW. -- Cheers, Paul B.

"Paul B. Webster VK2BZC" wrote: {Quote hidden}> > Wagner Lipnharski wrote: > > > Just take extra care to never look at the light, it can create severe > > problems at your eyes retinae. > > Actually Wagner, it is not so much the retinae that are at risk. The > UV is absorbed quite well be the stuff in between, such as the cornea, > lens and vitreous humour. Trouble is, it "cooks" them on the way > through! > > Also the sclera (white capsule of the eye) and conjunctiva (lining on > the surface of all but the cornea). "Welding Flash" and later, > cataracts are the most notable effects. I'll ask someone about > retinopathy though. > > Better approximation on the Ozone. If I recall this correctly, Oxygen > absorbs UV which breaks it into free radicals. These attach to O2 > molecules to become O3 (Ozone). These are however even more inclined to > absorb UV, so the Ozone is a good absorber. > > As Eric Oliver has mentioned to me in passing, the theory goes that > free Fluorine and to a lesser extent Chlorine catalyse the Ozone rapidly > back into Oxygen and reduce its absorption, but this is in hot dispute. > > FWIW. > -- > Cheers, > Paul B. Paul, you are 100% correct. It is a pleasure to share a cyberspace with you. Retinae problems are mostly caused by lasers that can "carve" severe "drawings" at it. About the Ozone, the high voltage also cause the same Oxygen recombination. Florida's weather is one of the most ozone creator in the entire world (from high voltage effect), based on the lightning occurrences here... :) Yesterday I paid attention to the "every afternoon thunderstorm" in Central Florida. This "raining period" starts sometime from 2pm to 4pm and lasts 1 hour. It is suddenly announced with strong thunder sounds that stays until the last drop of rain. Yesterday I tried to clock (for some time) the longest period without lightning, it was less than 5 seconds. The thunder sounds are pretty constant, and I start to miss those nice and calm rains (from Brazil) when you can hear the rain drops over empty cans at the backyard. Here this is getting weird, even with dozens of lightning protection systems we rush to disconnect everything, including phone lines. I have this neighbor that got most of his electronics fried two weeks ago. He uses those $25,000 insured surge protectors, as I do too. What that think can do when a 100,000 Volts 2,000 Amperes just travels over your power lines? Our power distribution system is underground, as well our phone system cables, "Things of nature".