| Author | Comment | Last activity | Moderation | ||
|---|---|---|---|---|---|
| warren | "I guess the WB introduces a big unknown about the relative amounts of NIR vs visible light. One way the NIR and VIS might mix in blue is that perha..." | Read more » | over 11 years ago | |||
| warren | "settling would work too, sure -- i think the important thing is the solubility " | Read more » | over 11 years ago | |||
| warren | "Hi Scott -- it looks like the samples are too dense for light to pass through... ideally the source light (laser or UV) goes all the way through th..." | Read more » | over 11 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 11 years ago | |||
| warren | "Wow... where do you get petroleum ether? I'm very interested in the isolation technique... is it applicable to other sample preparation, like for d..." | Read more » | over 11 years ago | |||
| warren | "Hi, Miguel - excellent and exciting to see your work! What kind of non polar solvent did you use? That's like, some kind of oily substance? " | Read more » | over 11 years ago | |||
| warren | "If you upload the image of selenium and clone the calibration of one of my spectra: https://spectralworkbench.org/tag/nist you'll have selenium. A..." | Read more » | over 11 years ago | |||
| warren | "Updated with a picture of it screwed together! " | Read more » | over 11 years ago | |||
| warren | "They will shortly be in the mail to you, Mathew. Thanks! " | Read more » | over 11 years ago | |||
| warren | "Mathew and I are getting ready for the smartphone spectrometers to ship and are printing slits on photographic printing plates (mathew probably kno..." | Read more » | over 11 years ago | |||
| warren | "Update! The 3d print returned and it looks great! " | Read more » | over 11 years ago | |||
| warren | "I think if we do something with a few more lines, as you say, we can try it out. Say, 75-50-25-0-25-50-75, each band being about a 1/4" wide. If yo..." | Read more » | over 11 years ago | |||
| warren | "Aha! http://www.amazon.com/3M-3700-Color-Laser-Transparency/dp/B00004TS5M/ I'll order this now; maybe drying won't be a problem with a laser print..." | Read more » | over 11 years ago | |||
| warren | "I actually don't have an inkjet printer; would you be at all interested in printing a few sheets of this and mailing it to me? I could then cut it ..." | Read more » | over 11 years ago | |||
| warren | "Thinking about how to do this well... did you print on a laserprinter? Can you run transparency through one of those? Would inkjet work, or would i..." | Read more » | over 11 years ago | |||
| warren | "I actually think there's an advantage to stepped grading, because a) it's easier to pick out the pattern -- like a barcode -- vs. continuous chang..." | Read more » | over 11 years ago | |||
| warren | "This looks great! Now, the tough part -- detecting enough light to get a spectrum. If you let the sample settle for a few days, does it look more c..." | Read more » | over 11 years ago | |||
| warren | "Cool -- can you post a link? " | Read more » | over 11 years ago | |||
| warren | "I especially like this photo: The tracing paper was my suggestion; you can read about it here " | Read more » | over 11 years ago | |||
| warren | "Wow, that is a gorgeous spectrum! Have you uploaded it to Spectral Workbench yet? I'd love to see a graph. " | Read more » | over 11 years ago | |||
| warren | "users would naturally just pick the middle I guess I'm suggesting that with a 50/0/50 attenuator, although users may pick the middle naturally (as..." | Read more » | over 11 years ago | |||
| warren | "I ended up trying some semi-opaque plastic but indeed the light has to be really strong as a result: http://publiclab.org/notes/warren/07-31-2013/m..." | Read more » | over 11 years ago | |||
| warren | "Also, i ended up ordering those crude oil samples online: http://publiclab.org/notes/warren/05-03-2013/crude-oil-samples-for-purchase-online I'm h..." | Read more » | over 11 years ago | |||
| warren | "Hi, sorry! It's a 532 green laser, like these: http://www.amazon.com/Shaped-Green-Laser-Point-LT-023/dp/B00D85BS4G/ http://www.amazon.com/Shaped-..." | Read more » | over 11 years ago |