| Author | Comment | Last activity | Moderation | ||
|---|---|---|---|---|---|
| jpschaaf | "I never really knew much about spectrometers (and still don't) but I happened on an article about green laser pointers which mentioned that a numbe..." | Read more » | over 6 years ago | |||
| Swede2 | "Oh, that's great. I'm glad the comment was useful. If you are satisfied with your hand built version, I'd recommend ordering the desktop version. I..." | Read more » | over 6 years ago | |||
| warren | "Ooh, good question on the camera! Post a question at #spectrometry and i know people have tried a lot of cameras! " | Read more » | over 6 years ago | |||
| jpschaaf | "By the way, thanks for mentioning the use of electrical tape. Applying that suggestion took my attempt to build one from nearly worthless to vague..." | Read more » | over 6 years ago | |||
| warren | "There may also be some mis-auto-focusing by the smartphone camera. Over-exposure too, but also try getting the focus to lock on the more detailed l..." | Read more » | over 6 years ago | |||
| stef | "Your image is way over exposed. You should be aware that this is an entry level project. The desk top is also used to stimulate discussion. Please..." | Read more » | over 6 years ago | |||
| Swede2 | "I'm adding one more discovery. I had been using a CD-R for the window because I have plenty of scrap versions of them. I decided to sacrifice a DV..." | Read more » | over 6 years ago | |||
| warren | "That's so awesome, @sanchittechnogeek -- did it go smoothly for you? any trouble, or improvements you made? " | Read more » | over 6 years ago | |||
| sanchittechnogeek | "Created a spectrometer! :) here are the pics below! " | 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 » | about 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 » | about 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 » | about 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 » | about 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 » | about 8 years ago | |||
| dhaffnersr | "This is very very cool! I'm looking forward to more of your work. " | Read more » | about 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 » | about 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 » | about 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 » | about 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 » | about 8 years ago |