Comments

Author Comment Last activity Moderation
stoft "Nice graphics. Yes, white LEDs are not broad spectrum. If it's of any help, I set (Matlab code) the ELP camera to: Manual Exposure, Exposure=-3 (-1..." | Read more » almost 3 years ago
stoft "@stef, thanks for the curve data. While the data is useful for comparison with relative sensitivity curves of other cameras, the data, unfortunatel..." | Read more » about 4 years ago
stoft "What I've read is that the RPi camera used to use the OV5647 camera chip but has "upgraded" (changed chips) to a Sony IMX 219 PQ CMOS image sensor ..." | Read more » about 4 years ago
stoft "Jeff, I inserted the component details in the note above, just before the plots. As to the RPi camera, it seems to have two "difficulties" which n..." | Read more » about 4 years ago
stoft "Jeff, yes, the data is being collected, and yes, higher resolution does improve observation of detail like slit differences. I'm evolving some new ..." | Read more » about 4 years ago
stoft "Jeff - hands-on experiences are usually helpful even if incomplete. You could tinker with the paper-n-tape process even if there are not enough hou..." | Read more » about 4 years ago
stoft "Thanks Jeff; understood. I'm presently working on a higher resolution P-4 spectrometers (including monochrome) so might find a spot for comparison ..." | Read more » about 4 years ago
stoft "@warren, I posted some draft note on testing to: https://publiclab.org/questions/stoft/09-15-2016/what-mechanical-specs-can-and-should-plab-spectro..." | Read more » about 4 years ago
stoft "Looks like good confirmation of what I observed -- although the clipping does distort the data. Yes, the noise at sample rate is not AGC (that loop..." | Read more » over 4 years ago
stoft "@Warren, thanks for the suggestions. Take a look (above) at the two new plots which replace the one(s) you referenced. You're right, the new ones m..." | Read more » over 4 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 » over 4 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 » over 4 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 » over 4 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 » over 4 years ago
stoft "Mathew, thanks. It's an interesting technique, though not without some added work to characterize a diffusion surface and assure bulb stability. I ..." | Read more » over 4 years ago