dssk
dssk


Author Comment Last activity Moderation
martin-slavik "Limit of detection is dependent on instrument and method used. Desktop spectrometer works only with visible light, so for detection of substance yo..." | Read more » about 5 years ago
amirberAgain "There are two devices I'm familiar with which could be relevant to your question: Nima - uses detection strips for gluten https://nimasensor.com/ ..." | Read more » about 5 years ago
Ag8n "Metals usually take instruments like atomic absorption (AA) or inductively coupled plasma (ICP). These instruments can NOT be done easily on the P..." | Read more » about 5 years ago
programmer1200 "Yah I'll do a post about the cuvette holder , that will probably be more useful to people , the camera mount is nice and I like it but its not spec..." | Read more » about 5 years ago
warren "@warren awards a barnstar to programmer1200 for their awesome contribution! " | Read more » about 5 years ago
warren "Wow, this is such a cool post! Love your upgrades. Would you be willing to post another specifically about your different attachments? Thanks so mu..." | Read more » about 5 years ago
programmer1200 "Here are the files , if you have any question or issues feel free to contact me :) https://www.thingiverse.com/thing:2660910 " | Read more » about 5 years ago
programmer1200 "Yah I'll happily uploaded them and post the links on here when I get them all together, This is the first time i've ever shared one of my builds so..." | Read more » about 5 years ago
stef "Also more detail, e.g. slit width, any other departure from stock to help others. Stef " | Read more » about 5 years ago
stef "It would be useful if you had given the thingiverse number along with your note. I'm interested. Thanks. Stef. " | Read more » about 5 years ago
warren "Hi, what project or kit are you using? " | Read more » about 5 years ago
stoft "There's still some clipping (source light intensity too high) so a comparison, using a cardboard mask (with a small hole in it), between the two bu..." | Read more » about 6 years ago
warren "Oh, interesting -- what types of bulbs were they? " | Read more » about 6 years ago
pablo "I've changed the bulb and used a less powerful one and I got good results: https://spectralworkbench.org/spectrums/91741 without the blue noise. W..." | Read more » about 6 years ago
pablo "Hi! I've followed all the recommendations (except refocus) but the blue hump is still there: https://publiclab.org/notes/pablo/11-09-2016/how-to-do..." | Read more » about 6 years ago
warren "Great idea to constrain and track this down -- it might make a good new question in its own right, esp. if it's a common issue (which seems likely)..." | Read more » about 6 years ago
stoft "No I don't think it is just inherent in the camera. The blue led has a fairly narrow spectrum (say 25nm at most) so producing a 150nm 'spread' woul..." | Read more » about 6 years ago
warren "OK - i guess the blue bulge is just a limitation of the camera... i had forgotten exactly. But if you subtract a baseline reading from any readings..." | Read more » about 6 years ago
pablo "I've focuses to 22cm, removed blue LED: https://spectralworkbench.org/spectrums/91509 The blue hump is still there. I'll try to change the DVD to ..." | Read more » about 6 years ago
warren "I think the blue hump was something we saw a lot on those SYBA webcams, and believe it was related to a blue LED in the webcam itself, which you ca..." | Read more » about 6 years ago
stoft "I note that 1) your spectrum does "fit" though it is 2) "offset" a bit from center which is likely related to the angle. (Just to identify what is ..." | Read more » about 6 years ago
warren "I think you can use this old focus tutorial and do it empirically: https://publiclab.org/wiki/dsk#Unscrew+the+lens+and+remove+the+infrared+filter ..." | Read more » about 6 years ago
pablo "Thanks @stoft and @warren. I've left the DVD as it was in spectrometer v2.0 (test: https://spectralworkbench.org/spectrums/91439) and it works. No..." | Read more » about 6 years ago
stoft "The angle is a function of (mathematical) of the detectable wavelength range and the diffraction grating (DVD) line spacing. My calculations and my..." | Read more » about 6 years ago