| Author | Comment | Last activity | Moderation | ||
|---|---|---|---|---|---|
| warren | "Via Annie on the main publiclaboratory list In case you have not heard back, check EarthWorks website for application for community group to reque..." | Read more » | over 6 years ago | |||
| loganw | "@stevie: The sensor is probably too noisy to actually work for methane. There's some further stuff that seems worth trying w/r/t noise reduction th..." | Read more » | about 7 years ago | |||
| stevie | "Hi! was hearing from a number of groups in CO this week about interest in low cost methane sensing. Any updates here? " | Read more » | about 7 years ago | |||
| mathew | "I'm also interested if the same lenses and filters could be applied to a Lepton sensor-- It's primary sensitivity is in the far infrared. It appea..." | Read more » | over 7 years ago | |||
| mathew | "I discovered the OpenMV project has a thermopile board. I can't find a lot of documentation on it, but I found this: https://openmv.io/docs/librar..." | Read more » | over 7 years ago | |||
| loganw | "Here's an update, I've received a sensor (uncalibrated, which turns out to be an issue) and read data off of it: http://exclav.es/2016/10/26/talkin..." | Read more » | over 7 years ago | |||
| mathew | "we don't have to frame the capabilities as a large leaks vs. small leaks question, I think it will be more about lighting conditions. The commerc..." | Read more » | over 7 years ago | |||
| loganw | "Cool! I was thinking about attaching a peltier cooler to it. I can't find much info on what that does to a thermopile sensor though, since they bas..." | Read more » | over 7 years ago | |||
| mathew | "I found this handy thermoelectric cooler module calculator: http://tetech.com/peltier-thermoelectric-cooler-module-calculator/ " | Read more » | over 7 years ago | |||
| mathew | "great to see these initial assumptions! and awesome work on finding both a low-cost sensor and a low-cost filter. The FLIR Lepton thermal images a..." | Read more » | over 7 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 | |||
| mathew | "The mirror arrays are looking more and more attractive because of their light-efficiency and compactness. Also, since I can now order cast and hig..." | Read more » | over 9 years ago |