question:question
question:question


Author Comment Last activity Moderation
amirberAgain "Be careful! light in the 450-480nm range (royal blue) is dangerous to unprotected eyes! 430 is not as bad but be aware! http://www.cree.com/led-com..." | Read more » over 6 years ago
amirberAgain "Can you measure pure water? Probably so! While largely transparent in the visible water absorb in the 700-850nm range, note that to image in that r..." | Read more » over 6 years ago
thangvu "I have no solution for multi-wavelength source like a spectrometer. I will try with another wavelength. " | Read more » over 6 years ago
thangvu "Thanks for your answer, I have the standard solution of 5-10-20..70 pt / cb (I borrowed), according to the standard method, when measured at 430nm,..." | Read more » over 6 years ago
Ag8n "Do you know what APHA values you will be observing? I was typically observing values under 25. And yes, a florescent light was very helpful again..." | Read more » over 6 years ago
Ag8n "If you used the right lamp, you would be ok. You need to use a broadband source, as stoft noted. " | Read more » over 6 years ago
thangvu "My idea is to use a 430nm wavelength to measure the color of the water, so, I use a 430nm (+ - 10nm) led as the source, but the 430nm led seems to ..." | Read more » over 6 years ago
thangvu "sorry for saying it is unclear, with wastewater, the color of the water partly assesses the level of water pollution. " | Read more » over 6 years ago
stoft "Depending on what information is needed from the spectrum (i.e. like the entire available spectrum, using a CLF will not be useful. A broadband sou..." | Read more » over 6 years ago
thangvu "Thanks for your helpful answers " | Read more » over 6 years ago
Ag8n "Try to avoid using blue water solutions, at least without doing some testing. The compact florescent lamps (CFL) loose intensity at the blue and o..." | Read more » over 6 years ago
Ag8n "Yes, it can. You need to go to the spectrometer page for more information. It will show how to set up cuvette s to hold water and what to use as ..." | Read more » over 6 years ago
briandegger "Maybe colour of liquid compared to distilled water/plain iron water. Qn example: Dissolved tannins give water a brown hue. " | Read more » over 6 years ago
stoft "Since H2O is a colorless fluid, 'color' appears not to be the correct intent of the question. The author would need to clarify the objective. " | Read more » over 6 years ago
zengirl2 "I think a fun way is using these Leaf Pack kits. " | Read more » over 6 years ago
Bronwen "You might like some of the work that North Brooklyn Boat Club has been doing in their Ed Shed. They also have a nice workbook designed for kids tha..." | Read more » over 6 years ago
xose " Incoming minirouters to try a libre one aroud 70$ for any wifi camera ;D " | Read more » over 6 years ago
xose "Just found this (GoPro only) for 90$ → http://www.eyeofmineactioncameras.com/Underwater_WiFi_View_by_Eye_Of_Mine_Action_Cameras_p/euwfv.htm " | Read more » over 6 years ago
guolivar "Some colleagues from Australia have been working on AirRater (https://airrater.org/) and we're working towards adapting it for specific projects. I..." | Read more » over 6 years ago
zengirl2 "TY @xose and @warren. I'll see if I can hunt down some more. " | Read more » over 6 years ago
xose "Hi there! We are working with some folks from Emapic on an online solution for the data collected with the Odo log 1.0. There's also @sarasage's Od..." | Read more » over 6 years ago
warren "@sarasage too! " | Read more » over 6 years ago
warren "Maybe @xose and others working on #odor-logging can chime in! " | Read more » over 6 years ago
warren "Added a follow-up to collect some reference images of respirable silica particles, here: https://publiclab.org/questions/warren/02-22-2018/what-do-..." | Read more » over 6 years ago