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ultraviolet
ultraviolet


Author Comment Last activity Moderation
exekutive "Are there any materials which fluoresce only under a fairly narrow band around 365nm? " | Read more » about 4 years ago
exekutive "Thanks, that's an interesting device. But it is only sensitive to two very narrow frequency bands. " | Read more » about 4 years ago
david_uwi "I'm currently looking at the VEML6075 to detect UVA and UVB. It seems to be what I might call "semi-calibrated" that is you can use default setting..." | Read more » about 4 years ago
exekutive "Hmm, perhaps a better detector would be a SiC photodiode. " | Read more » about 4 years ago
warren "Hi! I think most webcams can't see much lower than 400nm, but if your sample flouresces in the visible range, you can read that... There's been so..." | Read more » about 4 years ago
dhaffnersr "It's me again Jeff, Dave H, sorry I posted the wrong graph i made, this is the right one " | Read more » over 6 years ago
dhaffnersr "Hey Jeff, I use spekwin32 for all my spectral data processing, first here are 2 references that may help you https://www.researchgate.net/topic/uv..." | Read more » over 6 years ago
warren "Hi, Dave - what is the tell-tale hump? Do you mean from the LED input light? If so, it's at 398nm, not 385nm. What processing did you do? " | Read more » over 6 years ago
dhaffnersr "Hey Jeff, I saw your spectra of the nail polish machine and there it is the tell tail "hump," so I exported it and processed it and here is what it..." | Read more » over 6 years ago
dhaffnersr "Hey Dave, well I was thinking along the lines of when I built a wind speed indicator with a small dc motor and LCD screen attached and calibrated i..." | Read more » over 6 years ago
stoft "Unfortunately, LED wavelength does not change with applied voltage or current -- their center peak wavelength is not variable or controllable and P..." | Read more » over 6 years ago
dhaffnersr "Hey Jeff! Sure I'd be happy to test any LEDs you want to send. I do want to throw an idea your way, I think using the higher wavelength LEDs are st..." | Read more » over 6 years ago
stoft "Sure ... what's the LED's packaging style/type? SMD, leaded, ...? " | Read more » over 6 years ago
warren "@dhaffnersr and @stoft, if you'd like I could send you the lower-wavelength LEDs as well for comparison testing? " | Read more » over 6 years ago
warren "@briandegger @jeffh - thanks for the tips on LED sourcing! Thought you'd enjoy seeing this. " | Read more » over 6 years ago
warren "These look good too, and come with a spectrum datasheet: http://www.ledgroupbuy.com/solderless-true-violet-led-405nm/ " | Read more » about 7 years ago
warren "Powered on one of these, with a dial: http://www.watterott.com/de/Wattuino-Nanite85?x56e76=f63b1cee028854c06b93338f2945a806 " | Read more » about 7 years ago
warren "Here's the big list of UV LEDs below 405 nm " | Read more » about 7 years ago
warren "Crap, those are only in quantities of 400+ or 1000+. I'll keep looking. " | Read more » about 7 years ago
warren "@tonyc @ygstcu - looking at higher powered LEDs, I've found: ~$4.40: http://www.digikey.com/product-detail/en/VLMU3500-385-060/VLMU3500-385-060TR-..." | Read more » about 7 years ago
cfastie "I got a notification of this last one (7:52 AM today). It ended up in my gmail spam folder. It's the first one since Oct 15. " | Read more » about 7 years ago
icarito "Testing email delivery again! " | Read more » about 7 years ago
icarito_alter "Testing for email messages from SSL webserver user... hello all! " | Read more » about 7 years ago
icarito " Testing! " | Read more » about 7 years ago