| Author | Comment | Last activity | Moderation | ||
|---|---|---|---|---|---|
| Ag8n | "In industry, we commonly used draeger tubes to measure for a number of contaminants. There are other companies that make less expensive versions o..." | Read more » | over 4 years ago | |||
| monikaroymoni186 | "Thanks for sharing this article it was very helpful. Call Girls in Gurugram | 100% Hot Model Girls Service 24/7 Best Royal Escorts services in Guru..." | Read more » | over 4 years ago | |||
| social_equinoxlab | " Nice post buddy !! Really informative !! you can also check out this website for more info !! Indoorairqualitymonitoring.in " | Read more » | about 5 years ago | |||
| liz | "Hi @mprof9, if you post your project following the template above, people can start asking questions and collaborating! sensor calibration is a big..." | Read more » | over 5 years ago | |||
| warren | "Wow, that's great -- if you'd like to build out more about it, feel free to upload more photos and potentially create a page about it using one of ..." | Read more » | about 6 years ago | |||
| mprof9 | "Hi Warren. Yes, this is a project of mine. This is currently run at home, sampling ambient air outside on my terrace. Since I live in a small villa..." | Read more » | about 6 years ago | |||
| warren | "Hi, this is interesting! Is it your project? " | Read more » | about 6 years ago | |||
| btbonval | "@nshapiro Calibration is calibration, be it analog or digital. Not sure why that distinction is made, but the rest of the statements are more heart..." | Read more » | almost 9 years ago | |||
| nshapiro | "@btbonval we are using an analog detection method to avoid the pitfalls of digital calibration. The tubes are sealed in the lab and read on the spo..." | Read more » | almost 9 years ago | |||
| nshapiro | "Hey @liz! We have some of that information up @ http://publiclab.org/wiki/formaldehyde-exposure but you're totally right! We really need to make ou..." | Read more » | almost 9 years ago | |||
| liz | "I wish we had an info graphic to show which levels of formaldehyde are regulated by which agencies as compared to which levels of formaldehyde are ..." | Read more » | almost 9 years ago | |||
| DavidMack | "formaldehyde info from the Agency for Toxic Substance Disease Registry (ATSDR) http://www.atsdr.cdc.gov/substances/toxsubstance.asp?toxid=39#12 S..." | Read more » | almost 9 years ago | |||
| btbonval | "Any positive or negative controls you plan to test against just to make sure the device works? I know when I was using VOC detectors a long time a..." | Read more » | almost 9 years ago | |||
| liz | "Here's some info i received from @nshapiro over email: OSHA does regulate and test for formaldehyde but their levels are sky high and set in 1987:..." | Read more » | almost 9 years ago | |||
| nshapiro | "Here is some alternative tech to the FLIR-- hyperspectral camera for methane visualization (which is one of the most expensive gases to monitor). M..." | Read more » | about 9 years ago | |||
| amysoyka | "Here is the link to the full talk: https://www.youtube.com/watch?v=z7dfK5RfMTs " | Read more » | over 9 years ago | |||
| amysoyka | "You might appreciate what these guys did. http://youtu.be/yqB8w0WXhnc 1:45 - they built a portable lab to monitor gasses around fracking sites. " | Read more » | over 9 years ago | |||
| mathew | "Those lower wavelength bands may be cheaper or possibly not require as much cooling to get a fast sensor response. Good thinking. We need a ~100k..." | Read more » | over 9 years ago | |||
| geraldmc | "While methane has a main absorption band between 3200-3400nm, it also has weaker bands around 2300nm and 1650nm. For the 3200-3400nm band EOC sell..." | Read more » | over 9 years ago | |||
| mathew | "MWIR lenses: https://www.thorlabs.com/newgrouppage9.cfm?objectgroup_id=5428 http://www.ispoptics.com/catalog/2/IR%20Lens%20Assemblies http://www..." | Read more » | over 9 years ago | |||
| mathew | "The key filter seems to be a 3.46micrometer peek bandpass filter for midwave (MWIR) infrared. a few groups seem sell them or something like it. h..." | Read more » | over 9 years ago | |||
| mathew | "InAs (Indium Arsenide) looks almost perfect, with a high sensitivity and a peak sensitivity at 3400nm (3.4micrometers) when cooled to 196K. 196K is..." | Read more » | over 9 years ago | |||
| mathew | "Finding a sensor that can do high-speed sampling in the range required is looking pretty expensive. Thor Labs has a series of amplified, cooled se..." | Read more » | over 9 years ago | |||
| mathew | "Can we digitize a 240x320 analog video signal using an standard audio jack? A mac laptop captures a maximum of two cannels (stereo) at 96khz, with..." | Read more » | over 9 years ago |