| Author | Comment | Last activity | Moderation | ||
|---|---|---|---|---|---|
| mimiss | "We could have more than one of those larger LED's that we're currently using, but it might be bulky. One bulb on could be green, two bulbs on could..." | Read more » | over 5 years ago | |||
| warren | "true! might it be harder to read a bunch of sensors near each other? depends how theyre positioned i guess... " | Read more » | over 5 years ago | |||
| mimiss | "Moving to something that isn't color based might also help to clear up AQI confusion " | Read more » | over 5 years ago | |||
| mimiss | "The cost would be a bit more, but what about a small strip of LED lights and the number of lights that turn on correlate to the concentration? Simi..." | Read more » | over 5 years ago | |||
| warren | "During a quick chat with @mimiss, we discussed how a clicking sound speeding up or slowing down is used by Geiger counters. Using a blinking light ..." | Read more » | over 5 years ago | |||
| warren | " https://mapknitter.org/maps/solar shows an image like this, using a color mapping which is often used in thermal photography: " | Read more » | over 5 years ago | |||
| Jorgelopez | " This looks very interesting though " | Read more » | over 5 years ago | |||
| barakkasan | " Some say "partial color blindness" actually has more color intelligence than normal people you can see here: frontiersin " | Read more » | over 5 years ago | |||
| WhiteRabbit | "Interesting results! " | Read more » | over 10 years ago | |||
| WhiteRabbit | "Thank you for the very nice write-up. FWIW, it might be that you can get light in a narrower bandwidth from a point source than from an LED: http..." | Read more » | over 10 years ago | |||
| warren | "I know some people use the magnetic film from floppy disks, and I think i have some, if you want to try. " | Read more » | over 11 years ago | |||
| nedhorning | "There are gel and glass NIR-block filters that you can buy that do a pretty good job at blocking visible light. There might also be some other free..." | Read more » | over 11 years ago | |||
| mrrg | "Is it not possible to eliminate the visible light? " | Read more » | over 11 years ago | |||
| mathew | "Nice work with the LEDs. Look forward to seeing the setup at the Barnraising. " | Read more » | over 11 years ago | |||
| warren | " " | Read more » | over 11 years ago | |||
| cfastie | "The relative amounts of NIR vs visible light in each channel is definitely a big and important unknown. The camera can't do anything to change that..." | Read more » | over 11 years ago | |||
| nedhorning | "With the Infrablue filter there is both visible and NIR light hitting the camera sensor and it would be helpful to know how different wavelengths a..." | Read more » | over 11 years ago | |||
| mrrg | "okay, I was thinking you do not need to characterize it just treat all of it as NIR if you have a good filter.. Why do you need to characterize it?..." | Read more » | over 11 years ago | |||
| warren | "I guess the WB introduces a big unknown about the relative amounts of NIR vs visible light. One way the NIR and VIS might mix in blue is that perha..." | Read more » | over 11 years ago | |||
| nedhorning | "Sorry for not explaining this better. We were just trying to understand which sensor channels are recording which wavelengths of light. The images ..." | Read more » | over 11 years ago | |||
| mrrg | "Maybe I have misunderstod what you try to do.. but what if you add thicker sheet of HDPE plastic in front of the camera then only NIR would get thr..." | Read more » | over 11 years ago | |||
| nedhorning | "Thanks for posting this Jeff. The results are interesting. Most of the LEDs that I've seen have band widths in the 5nm - 10nm range. It's important..." | Read more » | over 11 years ago | |||
| straylight | "wow, good results jeff, as it happens, I'm about to do a similar test on some filters which we use for another experiment. It is rather important t..." | Read more » | over 11 years ago |