| Author | Comment | Last activity | Moderation | ||
|---|---|---|---|---|---|
| stef | "Further to my previous replies, it may be possible to view the sun disk attenuated with the filters used by welders to view their work. I have not ..." | Read more » | over 6 years ago | |||
| Metamer | "I, too am trying to get spectral data of sun/sunsets. Would be interested to hear what you've learned " | Read more » | almost 7 years ago | |||
| stef | "What I was alluding to is that with all of the filter attenuation, the cmos sensor was still overloaded. This can be seen in the spectra submitted..." | Read more » | almost 7 years ago | |||
| Ag8n | "There are two approaches to this, the hardware and software. Sounds like you took care of the hardware end very well. Can you think of any softwa..." | Read more » | almost 7 years ago | |||
| stef | "I have used photographic neutral density filters and have not been able to view the sun directly using the spec3 highly modified device. The attenu..." | Read more » | almost 7 years ago | |||
| Ag8n | "Only one suggestion then. Sunlight can be strong. As a safety measure, partially block the sun and work your way up to full exposure. Might not ..." | Read more » | almost 7 years ago | |||
| jsbonillam | "I am going to make and analyse the graphs with the wavelength and absorption. " | Read more » | almost 7 years ago | |||
| Ag8n | "Please forgive the question, but what lines are you using and what method of analysis? Thank you for the information. " | Read more » | almost 7 years ago | |||
| warren | "Oh, i don't know, but it looks very cool! " | Read more » | almost 7 years ago | |||
| jsbonillam | "@warren The camera will be just part of the spectrometer. I am still considering whether to use LDRs (light depending resistors), as here http://ww..." | Read more » | almost 7 years ago | |||
| warren | "How would you set up the spectrometer next to the other equipment, or the tracker? Are you using a raspberry pi camera as-is, as well, or just as p..." | Read more » | almost 7 years ago | |||
| warren | "I think the Lego spectrometer's suitability for this is an open question, but the Raspberry Pi Camera v2 is very low noise and could be worth testi..." | Read more » | almost 7 years ago | |||
| stoft | "Jeff, I have doubts about "current bleeding" between the quantum wells as they are isolated from each other with silicon and the conversion to data..." | Read more » | over 8 years ago | |||
| viechdokter | "Yeah, thanx for the tags. I will try to add them to my next notes. But feel free to add any tags you find helpful. " | Read more » | over 8 years ago | |||
| warren | "Also, it may be helpful to add some common tags like "spectrometer,overexposure" to your posts, which I've been trying to help do too. This will ho..." | Read more » | over 8 years ago | |||
| warren | "I also think that when a blue pixel is extremely overexposed, neighboring pixels may be triggered, either by current on the sensor chip itself or p..." | Read more » | over 8 years ago | |||
| warren | "Hi, thanks for posting! One thing I've wondered about is whether different exposures -- that are not clipping/overexposed but are different overall..." | Read more » | over 8 years ago | |||
| stoft | "Interesting observations. My guess is that IF the camera's sensor responded in a purely linear fashion, the over exposure would be white as you'd e..." | Read more » | over 8 years ago | |||
| viechdokter | "Hi Chris, you are right, the settings are important too. I absolutely forgot to mention them. Here is a (translated) snapshot of the settings: ..." | Read more » | over 8 years ago | |||
| cfastie | "Hi viechdokter, These are great observations. They reveal important features of spectra created using consumer cameras as the detector. It's real..." | Read more » | over 8 years ago | |||
| viechdokter | "Okay, now I understand. Thanx. " | Read more » | over 8 years ago | |||
| warren | "Hi, I think the glass in the camera lens and the sensor limitations may prevent much UV, even without a window. When we use a laser, we're mostly ..." | Read more » | over 8 years ago | |||
| viechdokter | "Okay, my sunlight did not show much UV because I let it shine through a glass window. Next time I will try without the glass. (Waiting for the nex..." | Read more » | over 8 years ago | |||
| dhaffnersr | "I am so glad that you asked that question! I use 2 types of cuvettes, 1) Quartz - they have neutral UV absorption, so it passes right on through wi..." | Read more » | over 8 years ago |