| Author | Comment | Last activity | Moderation | ||
|---|---|---|---|---|---|
| stoft | "Looks promising. Maybe these are obvious but... - Pick 3-5 oils, or oil mixtures, as a reference test set -- low to high density -- then use them f..." | Read more » | about 10 years ago | |||
| warren | "Unfortunately some of these lines are covered by others. I guess I should make the key show a wavelength too? " | Read more » | about 10 years ago | |||
| warren | "OK, I added a couple more features -- one which bisects a graph with a vertical line where the area of the graph is equally divided -- what's that ..." | Read more » | about 10 years ago | |||
| warren | "Mathew's notes on how overexposure/clipping can mess up curve shape are very important here and underscore @stoft's encouragement that we screen fo..." | Read more » | about 10 years ago | |||
| JSummers | "It sounds like the cuvettes absorb some oils (not quite the same as melting, but bad none the less). Plastic cuvettes are made for use with aqueou..." | Read more » | over 10 years ago | |||
| mathew | " " | Read more » | over 10 years ago | |||
| mathew | "this camera has these rounded diesel and oil curves. ND crude is decidedly greener than diesel in these spectra. https://spectralworkbench.org/set..." | Read more » | over 10 years ago | |||
| mathew | "ok, trying to see if I can get good results from the Sanm camera, since all these spectra are from the discontinued Syba camera.... nope. the Sanm ..." | Read more » | over 10 years ago | |||
| mathew | "nice! " | Read more » | over 10 years ago | |||
| mathew | "Gel caps fluoresce and we can't use them. And styrene is dissolved by oils. and we can't use it either. " | Read more » | over 10 years ago | |||
| mathew | "Ok- so styrene cuvettes are dissolved by diesel fuel and several other oils. In the photo below you can see the bottom dissolving into a sticky mes..." | Read more » | over 10 years ago | |||
| warren | "OK, added "equalize area" and scripting to the sets page: https://spectralworkbench.org/sets/show/1461 It still doesn't save, but makes that part ..." | Read more » | over 10 years ago | |||
| warren | "Diesel, gear oil, and N. Dakota crude: " | Read more » | over 10 years ago | |||
| warren | "Just a quick followup on area normalization: We really need smoothing that we can save too. " | Read more » | over 10 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 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 » | over 10 years ago | |||
| mathew | "poop. the caps fluoresce. " | Read more » | over 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 » | over 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 » | over 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 » | over 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 » | over 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 » | over 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 » | over 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 » | over 10 years ago |