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CCDs
Ok help.
What about these do we have to know for AQA syllabus A Astrophysics?
I can't find any good notes on them.. so help me!! I don't really understand them.
also what is quantum efficiency?
What about these do we have to know for AQA syllabus A Astrophysics?
I can't find any good notes on them.. so help me!! I don't really understand them.
also what is quantum efficiency?
My knowledge of this is very hazy at best but I think the quantum efficiency is what percentage of photons the CCD detects. So if it detected 20 photons out of 100 that were incident on it, then the QE would be 20%.
A CCD is made from silicon, with many pixels. When photons fall on a pixel, an electron is liberated and they are trapped in a potential well. The percentage of electrons detected is the quantum efficiency which is over 70% for a CCD. After a few minutes, the pixels are scanned, electrons are collected and an image is built up, with the number of electrons in each pixel proportional to the brightness.
Advantages of a CCD are the quantum efficiency being high, and that it is quick and easily processed.
That's all I have in my notes!
Advantages of a CCD are the quantum efficiency being high, and that it is quick and easily processed.
That's all I have in my notes!
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