| Author | Comment | Last activity | Moderation | ||
|---|---|---|---|---|---|
| warren | "Also see some of the suggestions here, which experiment with interior rigidity as well: https://publiclab.org/notes/ygzstc/08-19-2015/some-suggesti..." | Read more » | almost 9 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 9 years ago | |||
| viechdokter | "The little thing with the hole in front of your DVD - is this for preventing stray light coming in? " | Read more » | almost 9 years ago | |||
| warren | "I frequently have laser-cut acrylics made, in lots of several hundred, and the simplest ones are still about $3.50 each -- the process is not cheap..." | Read more » | almost 9 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 9 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 9 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 9 years ago | |||
| warren | "Excellent; so we'll think about timeframe plus # of samples. I think we could prompt people in the interface to "ensure stable reading" during a fe..." | Read more » | almost 9 years ago | |||
| viechdokter | "So... how about turning the (DVD holding) paper thing around and create a paper housing all around the wooden block with a parallel surface, a rect..." | Read more » | almost 9 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 » | almost 9 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 » | almost 9 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 » | almost 9 years ago | |||
| warren | "Great analysis. Based on this, I wonder if we should more strongly encourage people to do live capturing, and to have a time averaging default sett..." | Read more » | almost 9 years ago | |||
| viechdokter | "BTW I wonder if we could find out more about the effects of the camera if you could do this same setup plus statistics again let's say with a green..." | Read more » | almost 9 years ago | |||
| viechdokter | "PS: I guess if you use acrylic you need a real dull black finish to prevent stray light. PPS: when I thought about a new setup I also came to a "C..." | Read more » | almost 9 years ago | |||
| viechdokter | "Hi Chris, do you mean "sit flush" as in "parallel", "pressing tightly against it"? I thought you had a good reason for the 20° angle between DVD a..." | Read more » | almost 9 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 » | almost 9 years ago | |||
| warren | "Awesome! I did some sketches for a multiple piece outside enclosure that could be prototyped in cardboard but final cuts in laser cut acrylic: L..." | Read more » | almost 9 years ago | |||
| viechdokter | "For anyone who is interested: https://publiclab.org/notes/viechdokter/04-15-2016/thinking-about-a-more-stable-spectrometer " | Read more » | almost 9 years ago | |||
| viechdokter | "Sorry about the typo. I meant "You could build this from wood or ..." " | Read more » | almost 9 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 » | almost 9 years ago | |||
| warren | "Thanks, Dave, very helpful answers. I understand what you're saying about the difficulty of structuring a measurement of structural stability -- I'..." | Read more » | almost 9 years ago | |||
| stoft | "@viechdokter:, thanks; just a lot of years of practice. Not to worry, your's are logical and thoughtfully organized. Jeff, thanks. Yes, new observ..." | Read more » | almost 9 years ago | |||
| viechdokter | "The last point would be easiest to test: test a no-brand lamp with the same setup and the same power source and do the same stats on the results. " | Read more » | almost 9 years ago |