pm-sensing
pm-sensing


Author Comment Last activity Moderation
amirberAgain "Saw this during the air pollution open call today, It looks really nice! any reason you used ImageJ and not Python + OpenCV? " | Read more » almost 5 years ago
richardbowman "Hello, "Cambridge" here (though I've actually moved now). You're right, a laser diode would certainly get rid of the chromatic issues. I suspect ..." | Read more » over 5 years ago
mathew "That is an interesting question. I think the laser would get rid of chromatic aberration-- its a single frequency of light-- but I'm not sure that..." | Read more » almost 6 years ago
marlokeno "Hi, @mathew and @SimonPyle - Terrific work! After seeing the demonstration mathew gave at the barnraising in November '16, and then looking at Ca..." | Read more » almost 6 years ago
liz "Hey @kevinvivergy it's so great to hear from you! Here's the blue tagging assistance box that you will see when you click on "click here": ...W..." | Read more » about 6 years ago
kevinvivergy "Can do @liz, any in particular you would recommend? Not familiar with the system! " | Read more » about 6 years ago
liz "Hi @kevinvivergy, i have just tagged this note as an activity that others could try as well. I did this by adding the tag activity:open-air. If you..." | Read more » about 6 years ago
mathew "Flatfield and scale images: " | Read more » about 6 years ago
mathew "Here are some image sets including a flat field calibration and scale from the PSL imaging. 20160923_PSL_Sphere_SET.zip " | Read more » about 6 years ago
kevinvivergy "Thanks @drapoli! Yeah, when I built this thing I had not heard of Purple Air, I am really interested to learn more about it. The AQMD site has done..." | Read more » over 6 years ago
drapoli "Great discussion and a lot of good ideas. The AQ-SPEC group (www.aqmd.gov/aq-spec) has published results on several PM sensors other than the Dylos..." | Read more » over 6 years ago
kevinvivergy "Ahhh I see. And it looks like both ways showed that there is a big plume of particulates coming out of the rock quarry that dissipated over the rig..." | Read more » over 6 years ago
mathew "the authors did two levels of survey-- first the 6 minute 'snapshots' and then they used that to determine where to place passive monitors for long..." | Read more » over 6 years ago
kevinvivergy "Wow that is super interesting. That would definitely cover the variation over space... but what about if the levels vary over time in each particul..." | Read more » over 6 years ago
mathew "hah! school networks are always a problem. I posted a note recently on hotspot identification, the first stage of which involved a systematic surv..." | Read more » over 6 years ago
kevinvivergy "Thanks @mathew! Has certainly been an adventure. Only consistent issue has been school internet security protocols- they treat the Raspberry Pi as ..." | Read more » over 6 years ago
mathew "I'm revisiting your note, just want to say again how cool this is! great to see you're still up and posting data. " | Read more » over 6 years ago
kevinvivergy "Yeah I was thinking the same with the paint, introduces another source for pollutants. When I called the Dylos folks, they said that the device wi..." | Read more » almost 7 years ago
DavidMack "I was thinking you could expose the intake to ambient temperature in winter and by heating the enclosure you'd be warming the instrument and air in..." | Read more » almost 7 years ago
kevinvivergy "@Davidmack all good thoughts, thanks for the detailed response. -The big challenge with intake thing is that, if I understand your approach correc..." | Read more » almost 7 years ago
DavidMack "@kevinvivergy great detailed post. I'm not that familiar with the Dylos--haven't handled one--but looking at some photos maybe just cut out holes ..." | Read more » almost 7 years ago
kevinvivergy "Thanks @mathew! Yeah @jeff showed those to me, the AQICN one was pretty straight up too and I just went with theirs because I read their tutorial f..." | Read more » almost 7 years ago
mathew "awesome resources and case! hadn't seen this summary of low cost PM sensors: http://www.aqmd.gov/aq-spec/evaluations#&MainContent_C001_Col00=2 " | Read more » almost 7 years ago
mathew "if you're interested, we made Dylos drivers for Open Pipe Kit for the Pi-- its a flexible platform for pushing data to Phant and any other database..." | Read more » almost 7 years ago