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Author Comment Last activity Moderation
warren "@guolivar have you read over these reports and do they factor into your assessment of the Purple Air? Thank you both! " | Read more » over 3 years ago
warren "This is a GREAT post. Thank you so much!!! " | Read more » over 3 years ago
warren "Ah, yes, confirmed by @guolivar's post: https://publiclab.org/notes/guolivar/01-08-2018/thoughts-on-low-cost-air-quality-sensors " | Read more » over 3 years ago
warren "Quick update - the sensor in the Purple Air seems to be this one or one very similar, a laser based sensor with a fan -- the PMS5003 -- $30 shippe..." | Read more » over 3 years ago
stevie "Hi @BrandonFeenstra ! I had a group asking me about the Dylos this morning, so I went to the AQMD website and found the report for it like the one ..." | Read more » over 3 years ago
GreenFrogg "I don't have experience with the Purple Air. The page is an overview made by the Dutch institute of environmental health (RIVM). They coordinate. Y..." | Read more » over 3 years ago
stevie "@GreenFrogg I was checking out your list of sensors on this page and didn't see the Purple Air. Have you worked with it? what are your thoughts on..." | Read more » over 3 years ago
liz "This is so useful! Another imaginative concept brought to real world utility by Chris Fastie. If I ever have a well, I will install this to learn a..." | Read more » almost 4 years ago
warren "Tremendous! :tada: " | Read more » almost 4 years ago
amirberAgain "Si-based cameras (as the ones used in smartphones) have a very low sensitivity over 950nm and virtually none over 1000nm, so it is very unlikely. I..." | Read more » over 4 years ago
aldehyde "Hey folk, What kind of Framework (for Participatory PM2.5) can use for creating monitoring cities? " | Read more » over 4 years ago
guolivar "I tried to put a long answer here but it kept throwing errors so I wrote a note with my thoughts on this issue: https://publiclab.org/notes/guoliv..." | Read more » over 4 years ago
warren "Wig Zamore also chimed in on the mailing list: Hi Jeff - My guess is that if Weather Underground and EPA and CARB have been involved the product i..." | Read more » over 4 years ago
BrandonFeenstra "If you would like to learn more about Air Quality Sensors and their performance against regulatory instrumentation, I would recommend a visit to th..." | Read more » over 4 years ago
maltheR "Thanks for the info... I was looking for it myself.. And big up for your photos, sir.. " | Read more » almost 5 years ago
stoft "BTW .... the comments about LED 'voltage' perspective do not seem inline with LED parameters. With LEDs, it's not the voltage, it's the current you..." | Read more » over 6 years ago
warren "Thanks, Dave, good to know. I'd sort of imagine it's a monochromator, like a reverse-spectrometer, using masking and a diffraction grating to gener..." | Read more » over 6 years ago
stoft "Note: Their UV source was a PTI LS-100 fluorescence spectrophotometer -- no longer sold. From a google books print, it sounds like a variable-wavel..." | Read more » over 6 years ago
warren "Ah, thanks for the download tip. OK, that's really interesting to see that lower excitation wavelengths create more variable/distinct emission spe..." | Read more » over 6 years ago
stoft "Note: The article can be downloaded w/o signing up using the 'Download Full Text' button at the upper right of the image frame on the web page. Fr..." | Read more » over 6 years ago
warren "Another thing that 1995 paper could tell us is why they chose 30nm as the offset to discard above the excitation wavelength, and more about the lig..." | Read more » over 6 years ago
warren "I think @gretchengehrke is back from GOSH in Switzerland, so maybe she can chime in, but I wanted to question specifically @ethanbass's point: the..." | Read more » over 6 years ago
warren "Gretchen is a chemist, so I thought she could shed some light on our questions about overlap and shorter wavelength LEDs. " | Read more » over 6 years ago
warren "@gretchengehrke, can you help us w excitation emission wavelength questions? " | Read more » over 6 years ago