4 ms·
Are all the rainbow colored pixels in the picture caused by radiation hitting the camera sensor?
by jrs235 8y ago
Are all the rainbow colored pixels in the picture caused by radiation hitting the camera sensor?
- java-man 8y agoyes
- furyofantares 8y agoAll pixels in the picture are caused by radiation hitting the camera sensor
- dimensi0nal 8y agoI assume the commenter was referring to ionizing radiation.
- db48x 8y agoIn a CCD, even photons of visible light are ionizing radiation. The light causes electrons to pop out of a semiconductor and get caught in a capacitor, where they are stored long enough to be read out as a voltage, and turned into a number.
- est31 8y agoI don't think so. I rather think it's water droplets acting as little prisms. Radiation would hit the camera sensor in a random pattern and the effect would decay over time. A bit like how you determine pi with the monte calro method by throwing points at a circle and then checking whether they are inside or not. I found a video of the robot on YouTube [1] and it seems that the rainbow patterns don't follow the "monte carlo throwing" pattern, but their location depends on the scene. I don't know how radiation would affect a CMOS sensor, but I would guess it to be similar to what strong light is doing, e.g. when you point your camera into the sun. What then happens is an effect called "blooming": CMOS sensors work by photodiodes converting light to electric potential. If the radiation that reaches one of the photodiodes in the sensor plane is strong enough, the potential would jump to the other sensors next to it, causing a large bright field in the digital image. Edit: Oh and it seems that the material itself is reflecting light in a rainbow pattern, but that's not the same as "ionizing radiation hitting the sensor". Edit2: it could just be oil. Oil on water causes rainbow like artifacts. [1]: https://www.youtube.com/watch?v=cyKEVD4oC4s https://www.youtube.com/watch?v=cyKEVD4oC4s
- deleted 8y ago[deleted]