I set my Pi HQ camera taking images in the dark from 0s to about 300s to work out what its dark current is, and noticed the graph had a very clear sawtooth pattern to it. I would expect this to increase roughly linearly with exposure time, so I am wondering that this strange behaivour could be. Graph is exposure time against the counts shown on the camera.I tried this again but this time took the exposures in a random order rather than gradually increasing, but the same trend emerges:I asked ChatGPT and it thought it could be a "periodic black level correction," which lead me to this post that seems to discuss something similar but doesn't mention this pattern I'm seeing.
I also found that when photographing a flat field at very low exposure times, the sensetivity seems to have a plateu. See this graph:I am wondering if this has something to do with the sensor as well.
I also found that when photographing a flat field at very low exposure times, the sensetivity seems to have a plateu. See this graph:
Statistics: Posted by DanielDC88 — Mon Dec 09, 2024 9:19 pm