| Author | Comment | Last activity | Moderation | ||
|---|---|---|---|---|---|
| elaineyuyu | "Hi Chris, thank you so much for your answer! It seems we will have to purchase one of those expensive multispectral cameras, since we need to ident..." | Read more » | almost 7 years ago | |||
| cfastie | "Spectrometers based on consumer cameras, like the Public Lab spectrometers, can be built so they provide good information about which narrow wavele..." | Read more » | almost 7 years ago | |||
| shanlter | "Thanks @Liz, last year, there's a big scandal on gutter oil in Taiwan. https://en.wikipedia.org/wiki/2014_Taiwan_food_scandal " | Read more » | about 9 years ago | |||
| liz | "Hi @ygzstc, i heard from Li Zhou and He Shan in Guangzhou who asked me to pass along a question about detecting "recycled" food oil, AKA used resta..." | Read more » | about 9 years ago | |||
| ygzstc | "Himmm...I was aware of straylight's great research note but the linearity you mentioned there is not about webcam but about peak heights vs. concen..." | Read more » | about 10 years ago | |||
| warren | "Automatic exposure control is not disabled -- but some tests have shown webcams to be pretty linear: http://publiclab.org/notes/straylight/05-13-20..." | Read more » | about 10 years ago | |||
| ygzstc | "Thanks Chris :) As far as I know, this seems to be the standard way to compare absorbance spectra...But modelling part may vary depending on the t..." | Read more » | about 10 years ago | |||
| cfastie | "I proclaim this study to be highly replicable, and encourage others to reproduce Yagiz's results. Not that we should have any doubts about Yagiz's ..." | Read more » | about 10 years ago | |||
| stoft | "Ok, so the plots are absorption; which makes more sense. However, the Y axis is labeled "Intensity". It would be more clear to either plot relative..." | Read more » | over 10 years ago | |||
| ygzstc | "Dave - Thanks a lot for the insights...As you said, when I add oil sample, intensity decreases and since the plots above is the difference between ..." | Read more » | over 10 years ago | |||
| jeffh | "Very nice work. I checked the listing for the lamp, and if you are using the original bulb, it is a "warm white" with color temperature of 2700 deg..." | Read more » | over 10 years ago | |||
| stoft | "Nice experiment. As I recall, white LEDs have a significant 'bump' at about 430nm, a dip at 470nm and a broad peak about 600nm so I assume the 470 ..." | Read more » | over 10 years ago | |||
| liz | "Wow this is fantastic!!! I can't wait to try this method~! " | Read more » | over 10 years ago | |||
| ygzstc | "Jeff, I am sure it can be done. However, coding is not my strong suit :( I may help on theory and algorithm development though... Cfastie, you are..." | Read more » | over 10 years ago | |||
| cfastie | "This is excellent research. Do you think if I bought some "100% extra virgin olive oil" and sent you a sample, you could tell me if it was really 1..." | Read more » | over 10 years ago | |||
| warren | "Wow, this is spectacular -- thanks! I'm wondering if there's a way we could write a macro for Spectral Workbench to do this kind of analysis in rea..." | Read more » | over 10 years ago |