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| Re: [Orchid] Infrared light | ||
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From: Mike Aurelius Date: Fri Nov 22 20:04:47 2002 |
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========[ Invite a Friend - http://www.ganoksin.com/invite.htm ]======== Donna - Ok, I can see what they are doing, although I do not totally agree with the way they are calculating the shade number. As I mentioned in my previous note, one of the key factors in determining the shade number is the maximum visible light transmission, which for a shade 5 is 3.16%. What I believe that Gentex is doing is modifying the typical welders filter curve (which looks like a standard distribution curve) in such a way to transmit light centered in the orange/yellow wave bands (560 to 600 nm) and lowering the transmission in the rest of the visible light bands to achieve the overall 3.16% visible light transmission. There is nothing wrong or illegal or anything with doing this, and it does achieve the purpose of allowing "more" light through the filter (actually, the more "brilliant" colors), however, for metal working, you really want to cut the yellow sodium flare at 575 nm, not enhance it (this is what a didymium filter does). The standard welders filter peaks at about 536 nm, so what they have done is shifted the transmission spectrum towards the IR by about 50-60 nm. I have nothing against Gentex, as I said they are a well-known company with a good reputation. However, I don't personally believe that this particular filter is a good thing. The yellow flare that comes from sodium burning off is distracting and annoying and all this filter does is allow more of it to pass through. Anyway, that is my $0.02. Mike Aurelius ____________________________________________________________________ T h e O r c h i d L i s t Open Electronic Forum for Jewelry Manufacturing Methods and Procedures ____________________________________________________________________ Orchid FAQ: ~ http://www.ganoksin.com/orchid/faq.htm Orchid Archives: ~ http://www.ganoksin.com/orchid/archive Orchid Galleries: ~ http://www.ganoksin.com/orchid/gallery.htm Invite a Friend: ~ http://www.ganoksin.com/invite.htm ____________________________________________________________________ Tips From The Jeweler's Bench - Article Archive ~ http://www.ganoksin.com/borisat/tip_sear.htm The Jeweler's Selected Bibliography List ~ http://www.ganoksin.com/jewelry-books Buy Orchid Jewelry: ~ http://www.ganoksin.com/shop ____________________________________________________________________ -Unsubscribe: -Email: orchid-request AT ganoksin.com Body=unsubscribe subject=blank ____________________________________________________________________ |
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