ebert
ebert


Author Comment Last activity Moderation
warren "If it's helpful, we can probably ask some of the OTK beta participants for one, since a couple have access to lab spectrometers. In your image/ima..." | Read more » over 6 years ago
cfastie "Hi Gwill, there do seem to be a lot of terbium peaks. I have not yet figured out how to know which of those peaks are expected in the light from a ..." | Read more » over 6 years ago
warren "Thanks, Gwill -- good resource. Chris, I wanted to get some more clarity from @gretchengehrke on the mercury oxidation states in the comments of m..." | Read more » over 6 years ago
Guillaume123 "Chris, Have you ever looked at "The Elements Spectra"; it gives you numerical values of the peaks, you can get it from: www.infini-t.com or email..." | Read more » over 6 years ago
warren "Don't we have an ocean optics spectrum to source from too? I don't remember if we took a cfl spectrum with it, but we could maybe ask Mary to take ..." | Read more » almost 7 years ago
warren "Oh, sorry, to be clear, i just need the wavelength values. " | Read more » almost 7 years ago
warren "Hi Chris, for the upcoming "root mean square error" calibration "fitness" test, I want to sample not every single point, but all the peaks and trou..." | Read more » almost 7 years ago
cfastie "I don't know whether you could see a clear projected image of the spectrum. I think you could, but it would rather small and dim. I also don't know..." | Read more » almost 8 years ago
wizard "Wow... excellent information... thanks. I am a newbie, and my questions will be indicative of that.... I see now that I may assemble two spectrome..." | Read more » almost 8 years ago
warren "Sunwukong - I would love to see a pic of your setup; is it connected to a telescope? " | Read more » over 8 years ago
cfastie "Sunwukong, You can download the data from any spectrum at SpectralWorkbench.org. So at this page for one of the nicer CFL spectra from Ebert, you c..." | Read more » over 8 years ago
sunwukong "Do you have a data source for the intensity, pixl, wave length for the CFL in this image. Pictures are beautiful. I have a similar setup using so..." | Read more » over 8 years ago
Sreyanth "Thanks for such a nice post :-) I used overlapping averages to solve the x-shift problem and hence it actually averages the spectrum to a smoother..." | Read more » almost 9 years ago
cfastie "Maybe in a future enhancement the top 10 or 20 matches could be reanalyzed to check for this type of false positive. The reanalysis could be either..." | Read more » almost 9 years ago
warren "I expect that the odd matches you're getting are because Sreyanth's code is storing overlapping averages of intensity in 10 nanometer bins, and the..." | Read more » almost 9 years ago
straylight "Chris, this is so cool, really good info. I wonder if it applies to single malts ? " | Read more » about 9 years ago
cfastie "Excel allows nesting if statements, so: if((if(red>green,red,green))>blue,(if(red>green,red,green)),blue) should work, if you're not int..." | Read more » over 9 years ago
cfastie "=max(blue:red) is soo much easier. Thanks. The greater of three method seems to be useful for transmission or absorption spectra when a continuous..." | Read more » over 9 years ago
cfastie "Dan, you are correct that all we want to know is how the light intensity varies across the sensor where the grating has spread out the spectrum. Un..." | Read more » over 9 years ago
warren "The Bayer filter is frustrating, but if we can figure it out, it might be a hidden plus for us; in some ways, the R, G, and B channels can be treat..." | Read more » over 9 years ago
danbeavers "Perhaps I missed the explination but please help me understand why you don't just sum the 3 bands. It seems to me that the operative filter is the ..." | Read more » over 9 years ago
Tom_H "I think the essence here is that you have to watch carefully what is going on and choose a method that seems most appropriate for the situation. Th..." | Read more » over 9 years ago
Tom_H "Blown out data should show up as 255 in the csv file and thus would appear in a graph as peaks with a flat top (plateau) when graphed in excel, and..." | Read more » over 9 years ago
Tom_H "A simpler formula is: =max(red:blue) " | Read more » over 9 years ago