This is a testing site only. See the live Public Lab site here »
| Author | Comment | Last activity | Moderation | ||
|---|---|---|---|---|---|
| ruturaj_mohite | "I think sometimes rotating an image using software like Shotwell does't change the exif data, so there is no permanent change in the image orientat..." | Read more » | over 3 years ago | |||
| warren | " Hi, @B-winters - thanks for writing in. If you're comfortable using the command line and a Raspberry Pi, there is an offline version of a good bit..." | Read more » | over 4 years ago | |||
| arthaindustrialhill | " Thank you for the input and suggestions given, hopefully it will be a science for me to share photos " | Read more » | over 4 years ago | |||
| aemilius89 | " @warren Rotating the picture before uploading does no good. It will arrange the picture no matter what I do in the above manner. I would love to h..." | Read more » | over 4 years ago | |||
| warren | "Hi, Emiel - thank you very much for reporting this. We'll make a priority to get it fixed in the coming weeks but I apologize that the holidays are..." | Read more » | over 4 years ago | |||
| aemilius89 | " That is exactly what I tried as well. But i get send back to the 2.0 platform automatically. " | Read more » | over 4 years ago | |||
| B-winters | " I have had some similar issues with "flipped" images. Sometimes it seems that I just need to refresh the browser and wait, but I have also been tr..." | Read more » | over 4 years ago | |||
| JSummers | "You can get gratings from places like Thor Labs or Edmond Optics. For a uv lamp, I would look at Thor labs or spectrometer vendors like Ocean Opti..." | Read more » | almost 5 years ago | |||
| Ag8n | "Anything to help. Those wavelengths are common in HPLC work. Before the new instruments, for uv/vis detectors, they would take a mercury lamp and..." | Read more » | about 5 years ago | |||
| darkdimension | "@Ag8n Thank you for that bit of information. Those are spendy little lamps. I will see what I can get to work. Again, thank you for you helping me. " | Read more » | about 5 years ago | |||
| Ag8n | "The typical light sources used for commercial UV spectrophotometers are deuterium lamps. These light sources easily cover 190 nm to 400 nm. They ..." | Read more » | about 5 years ago | |||
| omarormachea | "Dear @TeacherHelen, you can use the following free software created for android platforms, you can get information about it, from the calibration a..." | Read more » | about 5 years ago | |||
| Bronwen | "Hi @TeacherHelen, nice to meet you! The Papercraft Spectrometer wiki is a good place to start. There you will find links to instructions for calibr..." | Read more » | about 5 years ago | |||
| Reallygeek | "I also tried to "override" by making this: https://docs.google.com/document/d/1cctjKW-4lCkrBZuILErFq1bBNidR6Igmm5zh9k_wvFo/edit?usp=sharing but I'..." | Read more » | over 5 years ago | |||
| Reallygeek | "Ok so all I did was, $W.getCrossSection= $W.data; which gave me the data one time, then every half second I got "$W.getCrossSection is not a functi..." | Read more » | over 5 years ago | |||
| jpschaaf | "I never really knew much about spectrometers (and still don't) but I happened on an article about green laser pointers which mentioned that a numbe..." | Read more » | over 5 years ago | |||
| Swede2 | "Oh, that's great. I'm glad the comment was useful. If you are satisfied with your hand built version, I'd recommend ordering the desktop version. I..." | Read more » | over 5 years ago | |||
| warren | "Ooh, good question on the camera! Post a question at #spectrometry and i know people have tried a lot of cameras! " | Read more » | over 5 years ago | |||
| jpschaaf | "By the way, thanks for mentioning the use of electrical tape. Applying that suggestion took my attempt to build one from nearly worthless to vague..." | Read more » | over 5 years ago | |||
| warren | "There may also be some mis-auto-focusing by the smartphone camera. Over-exposure too, but also try getting the focus to lock on the more detailed l..." | Read more » | over 5 years ago | |||
| stef | "Your image is way over exposed. You should be aware that this is an entry level project. The desk top is also used to stimulate discussion. Please..." | Read more » | over 5 years ago | |||
| Swede2 | "I'm adding one more discovery. I had been using a CD-R for the window because I have plenty of scrap versions of them. I decided to sacrifice a DV..." | Read more » | over 5 years ago | |||
| warren | "That's right! We thought 0-100 would be more familiar to people, but the original values are preserved in the raw data. " | Read more » | over 5 years ago | |||
| Dr_Z | "So I take it the percentages that come from scrolling along the graph are the ratio of the data pixel values to the max of 255, correct? " | Read more » | over 5 years ago |