| Author | Comment | Last activity | Moderation | ||
|---|---|---|---|---|---|
| stoft | "Hmmm, well the RAW data should have the same scale units which would be unsigned 8-bit integer from 000 to 255 -- so the Y axis should show noise h..." | Read more » | almost 8 years ago | |||
| stoft | "@Warren, I don't see that anyone is suggesting credential based peer review for PLab but IMHO, that does not exclude filtering based on good scienc..." | Read more » | almost 8 years ago | |||
| stoft | "@david-days, right. So, I have a theory ... right place for theories, right? ... that having a diverse source of contributors means just as diverse..." | Read more » | almost 8 years ago | |||
| stoft | "Well, except there's still a problem with the plot. The smallest increment looks to be '4 steps' per scale units of '10'. Either there was some mul..." | Read more » | almost 8 years ago | |||
| stoft | "Or, they are all 'bad' (noisy) to some degree ;-) The sharpness of the peak is still mostly a factor of slit, mechanical rigidity, being light-tigh..." | Read more » | almost 8 years ago | |||
| stoft | "Well, I'll chip in an alternative $0.02. I view formal / official peer review, the peer review 'scientific' concept, the peer review concept and en..." | Read more » | almost 8 years ago | |||
| stoft | "Yes, it's called quantization; the camera only has 8-bits and the scale of the two plots is likely about 3-5x different. Take a look at the 'red' p..." | 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 | |||
| stoft | "I believe both Excel and Quattro Pro provide for multiple plots. I suspect your's may as well -- in Quattro it's under the specialty xy plotting. I..." | Read more » | almost 8 years ago | |||
| stoft | "Not to worry, I too find bits to revise after I publish; what counts is fixing the details as they appear. One thought on visualization. When I do ..." | Read more » | almost 8 years ago | |||
| stoft | "Right. That's the Bayer filter pattern which sits in front of the imager chip and gives double the signal sensitivity for Green -- a simulation of ..." | Read more » | almost 8 years ago | |||
| stoft | "Good observations! Remember that the AGC is likley based on the sum total over the entire image; not per pixel. If there were independent AGC per c..." | Read more » | almost 8 years ago | |||
| stoft | "Jeff, I have a local supplier call Tap Plastics but I assume laser-cut plastics are now available in most metropolitan areas. Ok, that's fine to k..." | Read more » | almost 8 years ago | |||
| stoft | "@viechdokter, yes, it was just an experimental baffle for stray light. Keeping reflections low inside the space between slit and grating is necessa..." | Read more » | almost 8 years ago | |||
| stoft | "Actually, you need several additional pieces for SWB: 1) average 3-5 parallel lines, 2) monitor stability and take data until it IS stable or times..." | Read more » | almost 8 years ago | |||
| stoft | "Ideally, the user would select a "stable" ('smooth' or 'broad peak') region to monitor and then the software would take samples (and average) while..." | Read more » | almost 8 years ago | |||
| stoft | "You mean something like this? (from https://publiclab.org/notes/stoft/03-02-2015/plab-3-spectrometer-upgrade-prototype): Yes, mine could be simp..." | Read more » | almost 8 years ago | |||
| stoft | "This is and interesting observation and thought experiment. And I'd agree that controlling a light source's intensity while monitoring the camera's..." | Read more » | about 8 years ago | |||
| stoft | "@viechdokter yes, having a stable source helps isolate the noise source. I chose the Solux as I could measure the current as an independent check o..." | Read more » | about 8 years ago | |||
| stoft | "I believe the configuration with 45 and 20 deg was extracted from physically experimenting on the first PLab design. ( I think they were having dif..." | Read more » | about 8 years ago | |||
| stoft | "Yes, I'd agree that time averaging would help and, if possible, it sould be the default to reduce this noise component. I do not have 30 fps data, ..." | Read more » | about 8 years ago | |||
| stoft | "Hmmm... a few counter thoughts. 1) To match the camera optics with the grating to keep the spectral band spread across the pixels seems to require..." | Read more » | about 8 years ago | |||
| stoft | "Jeff; I'm glad I was clear. The mechanics is like the rest; it starts with the objective / spec that it is an optical device. That immediately rule..." | Read more » | about 8 years ago |