laser
laser


Author Comment Last activity Moderation
cfastie "Hi Jay, This is a great example of how important it is to get a good exposure on spectral photos. You have to hit it just right to get the most in..." | Read more » over 10 years ago
warren "We are now putting together an initial spectrometry oil testing kit... it'll need a lot of refinement but we really want to get moving on this. Che..." | Read more » over 10 years ago
warren "Hmm, do you have enough UV light? No, the sample container shouldn't matter, as long as you are seeing a glow coming from the sample. Can you post ..." | Read more » over 10 years ago
salem "hey guys..i am trying to do the same experiment but i am not getting any result. it seems that the uv light can't enter the spectrometer in order t..." | Read more » over 10 years ago
pwe11 "Hey guys- I'm new here and apologize if this has already been stated. If you want to see the maximum fluorescence, you must first look at its absor..." | Read more » over 10 years ago
eustatic "I'm also trying to reproduce. it's on an much longer time frame, though, than this experiment. " | Read more » over 10 years ago
warren "Note to self: found possibly-suitable boxes: http://www.uline.com/Product/Detail/S-12694BL/Retail-Boxes/9-x-6-1-2-x-2-3-4-Black-Colored-Mailers?mod..." | Read more » over 10 years ago
warren "Sorry -- he is going to try to reproduce this experiment. :-P " | Read more » over 10 years ago
warren "Scott has ordered some laser pointers and is going to try to reproduce. " | Read more » over 10 years ago
eustatic "woah! " | Read more » over 10 years ago
eustatic "cool " | Read more » over 10 years ago
jeffh "There are tradeoffs, but it's certainly worth trying violet/UV LEDs. The wavelengths are roughly equivalent, but the LED emits across a broader ran..." | Read more » over 10 years ago
warren "@jeffh - do you think it'd be possible to do such analysis using a blue or ultraviolet LED, instead of a laser? I wonder if it would be safer (for ..." | Read more » over 10 years ago
jeffh "Very nice experiment, and a great set-up for measurements. I bought a 405-nm laser a couple of months ago, and that's a much better wavelength for ..." | Read more » over 10 years ago
warren "@stoft - the reference was just the UV laser. I didn't have an empty vial at the time but you're right that we should do that test. The sample is a..." | Read more » over 10 years ago
greggbone "I would love to be able to characterize oils, olive oil in particular. Two areas of characterization: Adulteration and Quality. A very high perce..." | Read more » over 10 years ago
stoft "Jeff, nice experiment. Yes, UV is the right choice -- the shorter the wavelength the better. I'm assuming that the UV-light 'reference' was with wa..." | Read more » over 10 years ago
warren "Hi, sorry! It's a 532 green laser, like these: http://www.amazon.com/Shaped-Green-Laser-Point-LT-023/dp/B00D85BS4G/ http://www.amazon.com/Shaped-..." | Read more » almost 11 years ago
eustatic "what freq / amperage etc is this laser? " | Read more » almost 11 years ago
eustatic "awesome " | Read more » almost 11 years ago
id022012 "Greetings, can you tell me the brand and technical specifications of the laser you used in this experiment ? I would definitly like to expand on th..." | Read more » almost 11 years ago
liz "Hi Jeff, This is a really exciting direction! I have been wondering why particulate matter sensors are so expensive and hoping someone would start ..." | Read more » about 12 years ago