ebert
ebert


Author Comment Last activity Moderation
cfastie "That's very clever. " | Read more » about 5 years ago
dsvilko "Better than the vertical blur would be to simply resize the image to be 1 pixel tall (most resizing algorithms do this by averaging) and then again..." | Read more » about 5 years ago
dsvilko "Ups, I meant mercury, not sodium, of course. The line I can't identify is the one at 445.1 and 445.9nm. Any ideas? Also, are the two faint lines on..." | Read more » about 5 years ago
cfastie "I didn't know sodium was used as a phosphor in CFL lamps. That green line is one of the brightest in CFL spectra and in all mercury spectra, and me..." | Read more » about 5 years ago
dsvilko "By comparing my spectra of the Sun (more lines for precise polinomial callibration) with that of the CFL lamp, I can confirm that the green line is..." | Read more » about 5 years ago
stef "@warren, Here is the link to my latest cam https://spectralworkbench.org/spectrums/99143# also in Sun sky tags the slit is ca 0.04 mm cam is the MS..." | Read more » over 5 years ago
warren "Can you link to your data directly? I think it's possible higher resolution could help, but there may also be other resolution issues such as the ..." | Read more » over 5 years ago
liz "Thanks @zega! " | Read more » over 5 years ago
zega "Oh and i suggest using QTI plot (you can zoom into graph data way better then excel, plot traces with just right click/plot) very nice open source ..." | Read more » over 5 years ago
zega "Yes i do, here: FC__long.txt " | Read more » over 5 years ago
warren "Oh, great -- do you have raw data for these as well, like CSVs? " | Read more » over 5 years ago
zega "I will start with long CFL tubes that i just did... Unfortunately i don't have bare tube (diffuser in front/office lights) that might play same ro..." | Read more » over 5 years ago
cfastie "Hi Robert, In this note and comments we were lamenting the lack of replicate spectra of CFL lamps to confirm the information at the Wikipedia page...." | Read more » over 5 years ago
warren "Oh thanks! I believe, but Chris may correct me, that it'd be sufficient to measure a cold long tube fluorescent lamp and compare it to pretty much ..." | Read more » over 5 years ago
zega "@warren , @cfastie I see i'm kinda late to the party, i can offer source verification (you can ship CFL source to me) with 3rd party device, Ocean..." | Read more » over 5 years ago
warren "Great question -- I used tags to add the prompt for posting replications; if you're willing, would you mind posting your results using the button a..." | Read more » almost 6 years ago
cfastie "You are correct that this is not really an extraction. It's just plant material chopped up finely in a blender with some liquid. I also did this wi..." | Read more » almost 6 years ago
iamkat "Hi, I tried to re-create the lycopene extraction with methanol and ethanol (lab grade) but didn't get anywhere. It's my understanding that they are..." | Read more » almost 6 years ago
warren "Hmm. So I'm wondering if part of the fit problem is because we're simply comparing intensity at the 14 points and 13 troughs. Take this example: ..." | Read more » over 6 years ago
warren "Oops, meant to share links to my tests -- here's the one I used the new calibration system on, and listed 3 approximate errors for: https://spectra..." | Read more » over 6 years ago
warren "Hmm. I guess there are pros and cons to each approach. I agree that the 546 line doesn't result in a great linear calibration -- some end up about..." | Read more » over 6 years ago
cfastie "If the original Snowy Sky CFL is calibrated by pinning down the 436 nm and 546 nm peaks (using a macro) it looks like this: Most of the peaks do..." | Read more » over 6 years ago
warren "Would you be willing to try a recalibration using the 436/546 lines as a starting point? Would that be useful as a point of comparison? Also - I b..." | Read more » over 6 years ago
cfastie "That's a very important observation. Had I originally calibrated this spectrum on the 436 line and the 611 line (instead of 405 and 650), all the o..." | Read more » over 6 years ago