ccd
What is ccd? ccd stands for charged-coupled device.
A ccd is a sensor for recording images, consisting of an incorporated circuit containing a collection of connected capacitors.
I won’t go to much into the details on how one works. When light hits the CCD surface, it frees electrons to travel around and they collect in the capacitors. The electrons are shifted along the CCD by regular electronic pulses and “counted” by a circuit which dumps the electrons from all pixels in turn into a capacitor and measures and amplifies the voltage across it. Then empties the capacitor. This gives and effective grayscale image of how much light has fallen on every individual pixel.
CCDs contain grids of pixels are used in digital cameras, optical scanners and video cameras as light-sensing devices. They regularly respond to 70% of the incident light making them more proficient than film.. CCDs are rapidly adopted by astronomers.
CCDs are also widely used as sensors for astronomical telescopes, and night vision devices.
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