| Author | Comment | Last activity | Moderation | ||
|---|---|---|---|---|---|
| warren | "Ponoko requested that I don't let cut lines overlap, so I adjusted the cut file: spec-housing-2.1-24x12.pdf spec-housing-2.1-24x12.svg " | Read more » | almost 9 years ago | |||
| warren | "I like the screw-in-the-base option, but I also wonder if good coverage of strong double-sided tape is a choice we can offer too. Good thoughts; I'..." | Read more » | almost 9 years ago | |||
| stoft | "Just checking .... what is the mechanical relationship between the dimensions of the paper module and the inside dimensions of the laser-cut cover?..." | Read more » | almost 9 years ago | |||
| warren | "It's going to be $16.20, which is expensive for a cut but cheap for a prototype :-) Transparent acrylic (although I could use matte black at 22.70..." | Read more » | almost 9 years ago | |||
| warren | "I'm going to try getting it lasercut at http://www.ponoko.com/ -- in part to test if Ponoko is a service others could use for prototyping lasercut ..." | Read more » | almost 9 years ago | |||
| warren | "I like the idea of side holes for different types of spectrometry! The flap is to hold something like a leaf against the window so it's flat, and ..." | Read more » | almost 9 years ago | |||
| stoft | "I'm not following the flap bit. Why does the spectrometer need to be blocked? Also, from some simple experiements, I found that I needed much much ..." | Read more » | almost 9 years ago | |||
| warren | "I'm also interested in how this rigid frame allowed for additional scanning or sampling apparatus, for example for reflectance measurements off of ..." | Read more » | almost 9 years ago | |||
| warren | "Good idea -- here's an updated version with small screw or bolt holes: spectrometer-housing-2.svg spectrometer-housing-2.pdf " | Read more » | almost 9 years ago | |||
| stoft | "Clever; only 2 part types. Since the internal components are still merely "trapped" by the paper housing, you might consider adding a couple holes ..." | Read more » | almost 9 years ago | |||
| straylight | "thanks ygzstc, that makes sense. I think that the approximation that relative intensity measured from the scope can be used in place of the log rel..." | Read more » | almost 9 years ago | |||
| ygzstc | "Yes the Beer-Lambert Law is based on -log(I/Io) but it's applicable for a single wavelength value. (https://en.wikipedia.org/wiki/Beer%E2%80%93Lamb..." | Read more » | almost 9 years ago | |||
| warren | "It's odd -- I see the graphs. Straylight, can you contact web@publiclab.org so we can figure out what's going on there? " | Read more » | almost 9 years ago | |||
| straylight | "Thanks for the question. My apologies that all of the graphs appear to have vanished (they have for me). Not sure why, maybe a hosting issue. Anyw..." | Read more » | almost 9 years ago | |||
| anjohn12 | "Quick question, I'm trying to do something similar for a school project. Shouldn't the absorbance of the sample be the negative log of the percent ..." | Read more » | almost 9 years ago | |||
| kkoerner | "LukeS good to know, thanks for testing out those pumps and posting your results! " | Read more » | almost 9 years ago | |||
| mathew | "Great writeup, Luke! cool work. " | Read more » | almost 9 years ago | |||
| LukeS | "@kkoerner, I tried a similar pump when I was researching this and it created too much turbulent/pulsed of the air stream to get a good measurement ..." | Read more » | almost 9 years ago | |||
| msysinfo | "I need to measure oil concentration in a water mixture. Can a SPECTROMETER be used to measure the oil concentration? If it a solute that dissolves ..." | Read more » | over 9 years ago | |||
| kgradow1 | "Listed! " | Read more » | over 9 years ago | |||
| liz | "Thank you for this incredible documentation! Do you have a list of what you purchased from the Science Company? I bet other people would like to re..." | Read more » | over 9 years ago | |||
| nshapiro | "@kkoerner Hi Karl! Great find! It would be fantastic if you could request a quote on these. We are planning on have a lending library of these tool..." | Read more » | over 9 years ago | |||
| kkoerner | "Any thoughts on using a smaller pump? If you're only trying to draw 0.3 SLPM, there are a couple of pumps (see the attached datasheet and catalog) ..." | Read more » | over 9 years ago | |||
| danbeavers | "It appears you need some more ventilation or perhaps start using the remediation process. http://publiclab.org/notes/nshapiro/10-20-2014/diy-indoo..." | Read more » | over 9 years ago |