response:18991
response:18991


Author Comment Last activity Moderation
JSummers " Getting the solar spectrum was a good idea. Clearly, the lines in this are not due to the light source and must be attributed to the detector. O..." | Read more » about 3 years ago
stoft "Progress. Right, the likely alignment issue is grating to camera which is notoriously hard to do without having much mechanical control beyond tape..." | Read more » about 3 years ago
jenjimah " I just looked up the transmission spectrum of borosilicate glass and you're right I think it's fine. I might just try the microscope slide idea. I..." | Read more » about 3 years ago
stoft " Right ... the optical distances are very small ;-) which is why mechanical rigidity is so important ... (think of the 'optical bench' which is mad..." | Read more » about 3 years ago
jenjimah " ^^^ I just realized you were referring to line spacing in microns, not lines/cm! Now it makes sense. " | Read more » about 3 years ago
jenjimah "Also - I like the idea of microscope slides, except that glass strongly absorbs UV <400nm. I'm not sure of how well the pi NoIR is on that range..." | Read more » about 3 years ago
jenjimah "Yes, so far I'm trying to accomplish all those 3 points. As for the slit, I made it from a razor blade so it should fulfill the criteria. I compare..." | Read more » about 3 years ago
stoft " A while back I experimented with some 35mm 'slide-mount' holographic grating film (I believe it was 1200) vs the DVD (which is 740). The diffracti..." | Read more » about 3 years ago
jenjimah " Thanks for the feedback, and for the equation. That's super helpful. I asked the PublicLab when I ordered my kit regarding the diffraction lines/i..." | Read more » about 3 years ago
stoft " Looks like a nice clean construction. The glue should help mechanical stability. I did notice the swap from DVD to what appears to be a film holog..." | Read more » about 3 years ago
jenjimah "154520 153053 - sunlight Since this example is sunlight, this may mean some distortions are attributable to factors other than the rolling shutt..." | Read more » over 3 years ago
jenjimah " Possible examples of banding: 128155 - fluorescent bulb 122557 - CFL 97106 - Calibration 91584 - looks like a white LED " | Read more » over 3 years ago