| Author | Comment | Last activity | Moderation | ||
|---|---|---|---|---|---|
| stoft | "Ok, still a mystery; but I'll bet it's something simple that's overlooked. Let's double-check the obvious. In room light, the webcam by itself shou..." | Read more » | almost 9 years ago | |||
| smurpau | "Welp, still no luck, although the purple tint does appear to reduce the clipping (presumably just by absorbing some of the incident light) " | Read more » | almost 9 years ago | |||
| smurpau | "You know what, you're right. I don't see anything reflected from either side through the ethanol-washed piece, but I do through the original purple..." | Read more » | almost 9 years ago | |||
| stoft | "Ok, it was just a reflection in the earlier photo. Just good to check. Could there be any issue with the DVD as a diffraction grating having been a..." | Read more » | almost 9 years ago | |||
| smurpau | "Is this the paper holder you mean? I can't see any real gap from the front or back. I tried the spectrometer with the slit reversed as well (I'll t..." | Read more » | almost 9 years ago | |||
| stoft | "Quick question .... in your photo above (of the 0.4mm slit) it looks like there is a gap between the slit film and the paper holder for that film. ..." | Read more » | almost 9 years ago | |||
| smurpau | "Yes, this is the fluorescent tube 0.4mm slit diffraction grating and webcam As I said I've focused the webcam without the diffraction grating..." | Read more » | almost 9 years ago | |||
| warren | "I think the best plan may be to try focusing the webcam with the spec open and using a webcam program. It should be focused as it ships, actually. " | Read more » | almost 9 years ago | |||
| warren | "Hmm, I can't see any spectra on your profile at https://spectralworkbench.org/profile/smurpau Are you sure the earlier spectrum you posted was a f..." | Read more » | almost 9 years ago | |||
| smurpau | "Thanks for your reply @stoft. The light source is a fluorescent tube (there aren't any CFLs available here). I also have a green flashlight and my ..." | Read more » | almost 9 years ago | |||
| stoft | "Hmmm. Well, I'd agree the above image seems "fuzzy" but I'm also not clear as to what light the spectrum is representing. It also looks very over-e..." | Read more » | almost 9 years ago | |||
| smurpau | "I have the v3.0 kit but can't get a focused spectrum no matter how far I turn the focus ring clockwise or counter clockwise. The diffraction gratin..." | Read more » | almost 9 years ago | |||
| shanlter | "Thanks @Liz, last year, there's a big scandal on gutter oil in Taiwan. https://en.wikipedia.org/wiki/2014_Taiwan_food_scandal " | Read more » | almost 9 years ago | |||
| liz | "This is great! 20 people replicated this construction in Cuenca, Ecuador by printing out their own on heavy black paper. " | Read more » | almost 9 years ago | |||
| liz | "Hi @ygzstc, i heard from Li Zhou and He Shan in Guangzhou who asked me to pass along a question about detecting "recycled" food oil, AKA used resta..." | Read more » | almost 9 years ago | |||
| warren | "I'd also like to highlight the issue of the webcam USB cable pushing the camera -- we need a better way to manage the cable and have since the 2.0 ..." | Read more » | about 9 years ago | |||
| tonyc | " This isn't quite right dimensions, but proof of concept on the flared base allowing the block to register (with pressure from the bowed side wa..." | Read more » | about 9 years ago | |||
| warren | "Oh! comments crossed in cyberspace. I like the angled design, for strength! I think we could figure out the angles by building it in Sketchup and ..." | Read more » | about 9 years ago | |||
| tonyc | " This is a sketch of new version, with rectangular base. This would prevent the nose slopping around. Still tapers to a width equal to the webcam...." | Read more » | about 9 years ago | |||
| warren | "I just put together a little test based on your idea, although it only includes the webcam stand and not the DVD so far. I tried to make more inter..." | Read more » | about 9 years ago | |||
| tonyc | " " | Read more » | about 9 years ago | |||
| tonyc | "Here are some photos of another scale version. At the bottom is a new idea I want to create, but just parking for now. This model has a narrow "no..." | Read more » | about 9 years ago | |||
| MelissaN | "I wonder, for usability, if the V piece and the M-folded piece can have slits for the attenuator in both sides as well as their being an extra cuto..." | Read more » | about 9 years ago | |||
| HalLasell | "This is an old thread, and this has probably been resolved. However, Matlab has tools which enable which support conversion of Matlab code to C co..." | Read more » | about 9 years ago |