| Author | Comment | Last activity | Moderation | ||
|---|---|---|---|---|---|
| warren | "Oh, interesting -- what types of bulbs were they? " | Read more » | about 8 years ago | |||
| pablo | "I've changed the bulb and used a less powerful one and I got good results: https://spectralworkbench.org/spectrums/91741 without the blue noise. W..." | Read more » | about 8 years ago | |||
| pablo | "Hi! I've followed all the recommendations (except refocus) but the blue hump is still there: https://publiclab.org/notes/pablo/11-09-2016/how-to-do..." | Read more » | about 8 years ago | |||
| warren | "Great idea to constrain and track this down -- it might make a good new question in its own right, esp. if it's a common issue (which seems likely)..." | Read more » | about 8 years ago | |||
| stoft | "No I don't think it is just inherent in the camera. The blue led has a fairly narrow spectrum (say 25nm at most) so producing a 150nm 'spread' woul..." | Read more » | about 8 years ago | |||
| warren | "OK - i guess the blue bulge is just a limitation of the camera... i had forgotten exactly. But if you subtract a baseline reading from any readings..." | Read more » | about 8 years ago | |||
| pablo | "I've focuses to 22cm, removed blue LED: https://spectralworkbench.org/spectrums/91509 The blue hump is still there. I'll try to change the DVD to ..." | Read more » | about 8 years ago | |||
| warren | "I think the blue hump was something we saw a lot on those SYBA webcams, and believe it was related to a blue LED in the webcam itself, which you ca..." | Read more » | about 8 years ago | |||
| stoft | "I note that 1) your spectrum does "fit" though it is 2) "offset" a bit from center which is likely related to the angle. (Just to identify what is ..." | Read more » | about 8 years ago | |||
| warren | "I think you can use this old focus tutorial and do it empirically: https://publiclab.org/wiki/dsk#Unscrew+the+lens+and+remove+the+infrared+filter ..." | Read more » | about 8 years ago | |||
| pablo | "Thanks @stoft and @warren. I've left the DVD as it was in spectrometer v2.0 (test: https://spectralworkbench.org/spectrums/91439) and it works. No..." | Read more » | about 8 years ago | |||
| stoft | "The angle is a function of (mathematical) of the detectable wavelength range and the diffraction grating (DVD) line spacing. My calculations and my..." | Read more » | about 8 years ago | |||
| warren | "@stoft or @cfastie may be able to provide more info, but I believe it's been shown that the exact angle is not as important within the likely resol..." | Read more » | about 8 years ago | |||
| pablo | "Thaks, Jeff. I'll try to use a wooden block with a hole in it, or made with pieces to allow the cable to pass. I'll keep distance and height from t..." | Read more » | about 8 years ago | |||
| warren | "Hi, sorry, we linked it to another page -- should perhaps make it more prominent; there's a link leading to the new location here: https://publicl..." | Read more » | about 8 years ago | |||
| warren | "Hi, Pablo - I think you can leave the DVD as it is, and the challenge will be to get it to remain in the same orientation with regard to the slit, ..." | Read more » | about 8 years ago | |||
| dcchallener | "Where is the video to assemble the box? " | Read more » | about 8 years ago | |||
| warren | "Updated my answer: yes! " | Read more » | about 8 years ago | |||
| warren | "Just wanted to ping in here we did some stress tests last week based on these proposed tests, and they're quite dramatic -- a 4-5nm shift (these we..." | Read more » | about 8 years ago | |||
| stoft | "I'd guess that it's just the collection and comparison of key measurements extracted from the spectra which may result in 'sensitivity' estimates. ..." | Read more » | about 8 years ago | |||
| warren | "OK -- a few thoughts -- I'm taking multiple spectra at each step, and tagging all with "stability-upgrade": https://spectralworkbench.org/tags/stab..." | Read more » | about 8 years ago | |||
| stoft | "@warren, I didn't see you comment about a draft of test types for replication experiments so I just posted them at the end of this published note o..." | Read more » | about 8 years ago | |||
| warren | "Oops, the event is here: https://publiclab.org/notes/warren/09-27-2016/document-your-hardware-upgrades-at-parts-crafts-documentation-days-oct-12-19 " | Read more » | about 8 years ago | |||
| warren | "Hi Dave - I wanted to try out a set of tests when "reproducing and testing" the stability upgrade at the #documentation-days events on the 12th and..." | Read more » | about 8 years ago |