spectroscopy
spectroscopy


Author Comment Last activity Moderation
iresal "@JSummers I find very interesting the way you drive the ccd, I do not understand the clock roll value, was it arbitrary or is it related to the int..." | Read more » almost 6 years ago
xose "Amazing!!! " | Read more » almost 6 years ago
david_uwi "I've found that the clock timing with the Toshiba arrays is not quite as rigorous as suggested in the datasheet (I've only tried it with the TCD110..." | Read more » almost 6 years ago
Megoptera "What are the specifics on laser power? What do you use for the infrared blocker? What power microscope lenses do you use at #8 & 17? Thank you " | Read more » over 6 years ago
homechemist "Hi and sorry for the slow reply, yeah you are right, indeed I've a more detailed document related with the specifications and performance of my s..." | Read more » over 6 years ago
Megoptera "I couldn't help notice a lack of written material, esp a numeral-labeled diagram. Hoping this is an oversight or work-in-progress bcuz it has my in..." | Read more » over 6 years ago
stoft "But that was part of my point -- the camera does 'raw-capture' processing on the sensor's 12-14bit detector data before it gives you the 'raw' data..." | Read more » almost 8 years ago
cfastie "I think if you capture camera raw you have a single number (DN) for each pixel and you know what kind of Bayer filter that pixel was under. The DN ..." | Read more » almost 8 years ago
stoft "Hmmm ... remember that the jpeg data is derived from MANY pixels which were run thoguht demosaicing from the RGGB filtered data, so unless you had ..." | Read more » almost 8 years ago
warren "We'd have a lot more to work with if we knew which pixels were originally red vs green vs blue, and we could probably make more intelligent decisio..." | Read more » almost 8 years ago
stoft "Sure. No, it's not a photon count, but it is related -- though the DSLR is attempting to extract data that represents a film negative. To do that, ..." | Read more » almost 8 years ago
viechdokter "Thanx for explaining all this. Uhm, these "raw pixel data" you talked about, is THIS an electron/photon count? And if so, how long does the normal ..." | Read more » almost 8 years ago
stoft "Right, the (R+G+B)/3 average contains all the camera can deliver. [Aside: There are, however, separate 'weighted' formulas for combining RGB to get..." | Read more » almost 8 years ago
viechdokter "Ah, okay, I forgot about the "%" sign. I knew I was missing something. Just didn't know what exactly. Thanx for the quick answers. " | Read more » almost 8 years ago
dhaffnersr "hey viechdokter, the "scratched off" ccd screen, is the color film on the sensor's surface, very tricky and very risky to attempt it, but what hap..." | Read more » almost 8 years ago
cfastie "In Spectral Workbench the Y-axis on the spectrogram is "Intensity (%)." If you took the sum of all three channels and plotted them on the same grap..." | Read more » almost 8 years ago
viechdokter "@stoft: Yes, the second try suggests it is probably more a noise problem. I will re-do the test very carefully and see what a third data row brings..." | Read more » almost 8 years ago
stoft "Hmmm.... The noise appears significant enough that to do amplitude comparisons between filter settings I'd suggest taking at least 3 separate sets ..." | Read more » almost 8 years ago
stoft "My guess is that the wavelength transmission curve of the glass (depending on type) softly "rolls off" for shorter wavelengths -- i.e. the glass is..." | Read more » almost 8 years ago
cosettespafford "Thank you, Chris! Your explanation really helped! Cosette " | Read more » over 8 years ago
cfastie "Hello, Some experiments suggested that viewing the spectrum at a slight angle (from perpendicular to the grating) produced a clearer image of the ..." | Read more » over 8 years ago
QMTphysicist "Hi Suiris, it good to see how filtering the tap water works. How do you take transmittance measurements using spectralworkbench? I am looking into ..." | Read more » over 8 years ago
warren "Hi, we're compiling input here: https://github.com/publiclab/spectrometer3/issues/25 for an October redesign. Thanks! " | Read more » over 8 years ago
warren "Great, thanks. I think we could relatively easily find a heavier material to make this work. Would you be able to post the picture of your sleeve p..." | Read more » almost 9 years ago