| Author | Comment | Last activity | Moderation | ||
|---|---|---|---|---|---|
| warren | "There's now been a lot of work on this via WebValley and @cristoforetti -- take a look at #webvalley posts, and we managed to get it working! " | Read more » | almost 8 years ago | |||
| warren | "the slit-based PLab design does not provide the optical characteristics of field of view like the lens on a camera (and I'm not aware of any analog..." | Read more » | almost 8 years ago | |||
| warren | "The new SpectralWorkbench.js library can (in Node.js javascript) convert a spectrum image file to a spectrum JSON or CSV file, so perhaps that's a ..." | Read more » | almost 8 years ago | |||
| warren | "However, if it's possible to either turn off exposure compensation between your two scans, or to scan both spectra at the same time (side by side),..." | Read more » | almost 8 years ago | |||
| warren | "Yes, as @stoft mentions, an absolute intensity calibration is not required for demonstrating the Beer Lambert law; @mathew refers to a post about g..." | Read more » | almost 8 years ago | |||
| warren | "This is especially cool as it uses a Raspberry Pi camera, which it seems can be set for fixed exposure and uncompressed image capture. I'm going to..." | 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 | |||
| warren | "Really, almost there, I guess I must not have accounted for the loss of material by the laser, but it needs to be 1/16 inch taller and wider. Maybe..." | Read more » | almost 8 years ago | |||
| warren | "What I did to compare is to calibrate on a CFL, then scan a tube fluorescent, so that the methodology for calibration is the same: https://spectra..." | Read more » | almost 8 years ago | |||
| warren | "Actually this looks calibrated, no? " | Read more » | almost 8 years ago | |||
| warren | "OK, done! I just replaced the original file. " | Read more » | almost 8 years ago | |||
| warren | "Ugh, i must've made some mistakes in unit conversions, and it came out quite wrong. Here's a new version, more carefully measured: spec-housing-2..." | Read more » | almost 8 years ago | |||
| 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 » | about 8 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 » | about 8 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 » | about 8 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 » | about 8 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 » | about 8 years ago | |||
| warren | "Thanks, Guillaume851 - I've seen yours and it does look very rigid, thank you! Part of the design I'm prototyping in my note here is a design we co..." | Read more » | about 8 years ago | |||
| warren | "If you're at all interested in reflectance measurements, I posted a sketch for a reflectance setup here that might interest you: https://publiclab...." | Read more » | about 8 years ago | |||
| warren | "Great post! I love how you so clearly stated some of the conclusions. A few thoughts: maybe I missed this, but to @viechdokter's comment, are th..." | Read more » | about 8 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 » | about 8 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 » | about 8 years ago | |||
| warren | "I went ahead and created a specific issue for native 8-bit storage: https://github.com/publiclab/spectral-workbench.js/issues/18 As well as outlin..." | Read more » | about 8 years ago | |||
| warren | "Hi, all -- 2.55 is definitely related to the 0-255 value. The code that generates the CSV is here: https://github.com/publiclab/spectral-workbench..." | Read more » | about 8 years ago |