absorption
absorption


Author Comment Last activity Moderation
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 7 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 7 years ago
warren "Yes, that sounds right. I think the remaining issue was that unfortunately it wasn't clear if the RPi camera can be accessed via the browser webcam..." | Read more » over 7 years ago
rthalman "Warren, looking at your post (and specifically the size of the camera you are referring to, you could easily interface that by just attaching it to..." | Read more » over 7 years ago
warren "Related question here: https://publiclab.org/notes/warren/09-28-2016/upgrade-a-diy-spectrometer-with-a-raspberry-pi-camera " | Read more » over 7 years ago
warren "Very interested to see this, kudos! We've had some difficulties finding standard ways to disable exposure compensation on webcams, and there's been..." | Read more » over 7 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 » over 7 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 » over 7 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 » over 7 years ago
gpotters "@cfastie: well, I recall that we made whole leaf spectra in the lab (me = biologist, Ph D of UAntwerp). Guess with a decent light source you can do..." | Read more » over 8 years ago
vanjo63 "I am going to try the experiment with an extraction of grass pigments by ethanol even if I don't think there is a big difference. That will allow t..." | Read more » over 8 years ago
cfastie "I have wondered about how important it is to really extract the plant pigments for this type of absorbance observation. If you had an intact transp..." | Read more » over 8 years ago
gpotters "Maybe you should try to do your extraction with some alcohol. Chlorophylls are, after all, lipophilic and you have to get them out of the chloropla..." | Read more » over 8 years ago
cfastie "I guess you are right about the two peaks. I was thinking that you had captured the lesser peak of Chlorophyll a shown here at about 410 nm: Tha..." | Read more » over 8 years ago
dhaffnersr "This is very very cool! I'm looking forward to more of your work. " | Read more » over 8 years ago
vanjo63 "Oh tank you for this information, I didn't know that was possible to do that via the application Spectral Workbench 2 :) " | Read more » over 8 years ago
warren "This is very cool, thanks for posting! I also wanted to point out that comparisons of this type are possible in Spectral Workbench 2: And so ar..." | Read more » over 8 years ago
vanjo63 "In fact, chlorophyll a has 2 peaks : the first around 430 nm and the second around 660 nm ; while chlorophyll b has also 2 peaks : the first around..." | Read more » over 8 years ago
cfastie "That's a good idea to use only one color of light. It can make it easier to interpret the result. Your result is very consistent with the two peaks..." | Read more » over 8 years ago
shubham "Thank you Warren. I downloaded the .csv file and will try to work on the stats. Will keep updated on the project. :) " | Read more » over 8 years ago
warren "This looks fantastic; yes, you could increase your camera resolution. You can download .csv from any Spectral Workbench spectrum -- it's on the le..." | Read more » over 8 years ago
warren "I am so sad in retrospect that I did not enter this competition, Chris. " | Read more » about 9 years ago
cfastie "Please note at upper left the response to this note. https://publiclab.org/notes/cfastie/12-24-2014/potent-potable-puzzle " | Read more » over 9 years ago
stevie "So what's the answer? " | Read more » over 9 years ago