foldable
foldable


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 » almost 9 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 » almost 9 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 » almost 9 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 » almost 9 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 » almost 9 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 » about 9 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 » about 9 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 » about 10 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 » about 10 years ago
mathew "poop. the caps fluoresce. " | Read more » about 10 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 » about 10 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 » about 10 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 » about 10 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 » about 10 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 » about 10 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 » about 10 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 » about 10 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 » about 10 years ago
warren "Check out this post: http://publiclab.org/notes/warren/07-05-2014/oil-testing-spectrometry-workshop-at-fab-10 " | Read more » over 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 » about 11 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 » over 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 » over 11 years ago
dusjagr "Und die Gr??ne Fee ist auch mir ??ber ohen Fragenzeichen " | Read more » over 11 years ago
dusjagr "and the fonts for "les Fran??ais" dont really work.... V??ritable F??e Verte " | Read more » over 11 years ago