| Author | Comment | Last activity | Moderation | ||
|---|---|---|---|---|---|
| cfastie | "The entrance slit should be parallel to the grating lines. I don't recall that anyone found that spectral quality is improved with one side or the ..." | Read more » | over 8 years ago | |||
| doctek | "Not sure if that helps or not. Here is a fundamental question I'm unclear about. Knowing that the diffraction lines on the DVD are parallel to the ..." | Read more » | over 8 years ago | |||
| warren | "Sorry, i was holidazing! Can you upload a pic of your build, so we can help debug? You kind of have to look perpendicular to the grating's surface,..." | Read more » | over 8 years ago | |||
| doctek | "Thanks for this clever design! I made this using my Portrait and the only cardstock I had handy: pink. After assembly, I covered the outside in bla..." | Read more » | over 8 years ago | |||
| warren | "I love it! It looks great, and I have a Cameo too. I want to try cutting it into a plastic sheet, too! " | Read more » | over 8 years ago | |||
| mathew | "that is a great idea! HPMC, or hypromellose looks promising. It looks like pullulan is used as a Near IR tracer, so it would fluoresce, but maybe ..." | Read more » | over 8 years ago | |||
| ethanbass | "How about using vegetarian capsules? This kind is made out of hydroxypropyl methylcellulose (or HPMC). They also make vegetarian capsules out of pu..." | Read more » | over 8 years ago | |||
| mathew | "I wish we didn't have the fluorescence issues, the gelcaps do allow the capture of a brighter fluorescence than the cuvette holders; the chlorophyl..." | Read more » | over 9 years ago | |||
| mathew | "whelp. forget gelcaps. The article I posted here is right- gelatin fluoresces. the whole blue-green section of this spectra was the cap itself. " | Read more » | over 9 years ago | |||
| mathew | "poop. the caps fluoresce. " | Read more » | over 9 years ago | |||
| mathew | "I will test an empty gelcap for fluorescence now. I searched google maps for a "compounding pharmacy" in my neighborhood and found one close by. T..." | Read more » | over 9 years ago | |||
| warren | "I tried to find gel caps but CVS didn't have them; I was going to order online but saw your note about the fluorescence... should I still order them? " | Read more » | over 9 years ago | |||
| warren | "Do you (or jack) mean getting the laser to be in the same place each time with relation to the slit? If the laser is fixed in place by the cardboar..." | Read more » | over 9 years ago | |||
| mathew | "@JSummers was commenting that the light path on my gel caps was never going to be consistent enough to compare to the laser peak. this seems to be..." | Read more » | over 9 years ago | |||
| mathew | "the fluorecence looks the same even when the laser heads into the sample at a slightly different angle-- is the light path critical? I figured it o..." | Read more » | over 9 years ago | |||
| warren | "Actually, kind of amazing -- for the Creative webcam ones, not enough laser was actually reflected into the spectrometer to get the 405nm peak... c..." | Read more » | over 9 years ago | |||
| warren | "Oh, edit: the Creative had a wider than usual slit -- maybe 1.25mm or so. So maybe the clipping in the blue channel wouldn't be as bad with a littl..." | Read more » | over 9 years ago | |||
| JSummers | "I hate to say it, but it looks like your laser peak at 499 nm looks like it was truncated, meaning that your fluorescence intensity is 25% of what ..." | Read more » | over 9 years ago | |||
| warren | "Check out this post: http://publiclab.org/notes/warren/07-05-2014/oil-testing-spectrometry-workshop-at-fab-10 " | Read more » | almost 10 years ago | |||
| warren | "Hey dusjagr - did you see these posts on a new design for a liquid spectrometer? http://publiclab.org/notes/warren/08-08-2013/design-for-coffee-sp..." | Read more » | over 10 years ago | |||
| warren | "I've been thinking a lot about this -- really want to design a version with an LED for a fixed, stable light source as well. I'd love to have a ver..." | Read more » | almost 11 years ago | |||
| warren | "Apologies for the character rendering; it's a known bug we're trying to resolve: https://github.com/jywarren/plots2/issues/102 " | Read more » | almost 11 years ago | |||
| dusjagr | "Und die Gr??ne Fee ist auch mir ??ber ohen Fragenzeichen " | Read more » | almost 11 years ago | |||
| dusjagr | "and the fonts for "les Fran??ais" dont really work.... V??ritable F??e Verte " | Read more » | almost 11 years ago |