| Author | Comment | Last activity | Moderation | ||
|---|---|---|---|---|---|
| jjoll | "thanks for the answer Warren, I have one more question. I was going through the Spectral Workbench website. I noticed that you can extract cvs file..." | Read more » | over 7 years ago | |||
| warren | "There have been some efforts to use linear CCDs with arduinos, which is very cool and bypasses a lot of the mysterious image processing cameras do:..." | Read more » | over 7 years ago | |||
| cfastie | "The Public Lab spectrometers rely on cameras to make images of diffraction patterns. So the raw data is a photograph or video frame. Processing the..." | Read more » | over 7 years ago | |||
| jjoll | "hello savargaz, thanks for the answer. what are your thoughts on distinguishing classes as large as all plastics. Will there be a unique spectral s..." | Read more » | over 7 years ago | |||
| savargaz | "You can most definitely use spectrometers to detect different types of materials. All materials are composed differently and thus will absorb and r..." | Read more » | over 7 years ago | |||
| warren | "Just wanted also to link to @stoft's input on this question in this comment: As to the RPi camera, it seems to have two "difficulties" which need ..." | Read more » | about 8 years ago | |||
| warren | "Oh great; @khufkens also shared that on this site! https://publiclab.org/notes/khufkens/11-02-2015/ov5647-raspberry-pi-camera-spectral-response-qua..." | Read more » | about 8 years ago | |||
| warren | "I found that V4L2 driver apparently makes it possible to use the raspberry pi camera in Firefox with webrtc, the API Spectral Workbench uses: https..." | Read more » | about 8 years ago | |||
| Siphirobe | "I was wondering the same thing, just with the PiNoIR camera since I am more interested in remote sensing of vegetation. " | Read more » | about 8 years ago | |||
| stef | "@warren After sleeping it over, realized that due to the no IR filter of the raspberry the bandwidth response will be different from the published..." | Read more » | about 8 years ago | |||
| stef | "@warren Here is a link http://www.khufkens.com/projects/ov5647-spectral-response/ and here is a zip file khufkens-pi-camera-response-curves-3342e..." | Read more » | about 8 years ago | |||
| warren | "That's a great thing to point out -- do you per chance have a link to the spectral bandwidth of the sensors? Thanks! " | Read more » | about 8 years ago | |||
| stef | "The BIG advantage of the Raspberry Pi is the use of the Sony IMX298 sensor whose spectral bandwidth is known and is 16 megapixel sensor. Much like ..." | Read more » | about 8 years ago | |||
| abdul | "@warren is there a chance to write a note about using a raspberry pi and post it as a build? I think others have had interest about this. Did we al..." | Read more » | over 8 years ago | |||
| warren | "There's now been a lot of work on this via WebValley and @cristoforetti -- take a look at #webvalley posts, and we managed to get it working! " | Read more » | over 8 years ago | |||
| interestedperson_ha | "@all who gave a comment/ answer: Thanks a lot for your advice, sorry for my late reply. Since I regard myself as spectrometry-newbie reading the c..." | Read more » | over 8 years ago | |||
| warren | "I think that makes sense. I didn't mean Beer Lambert would be related to the reagent's affect on the color, but merely that if the reagent reacts l..." | Read more » | over 8 years ago | |||
| stoft | "It is my understanding that Beer's law is not the relationship between reagent's effect on color, but is the property of light passing through a un..." | Read more » | over 8 years ago | |||
| warren | "Oh yeah -- actually that's an open source method too, by Joshua Pearce's lab; you can find some of the parts here: http://www.thingiverse.com/thing..." | Read more » | over 8 years ago | |||
| tonyc | "check out this tool, using reagents: here may be what you are looking for? " | Read more » | over 8 years ago | |||
| warren | "Hello, what are you interested in specifically measuring, in nutrients? Nitrogen, potassium, phosphorus? I believe there are some colorimetric reag..." | Read more » | over 8 years ago | |||
| warren | "Hi! We just released a Node.js version of the core library here: https://github.com/publiclab/spectral-workbench.js I think it'd be possible to ta..." | Read more » | over 8 years ago |