Advantages and Disadvantages of a CCD (Charge-Couple Device)?
So I'm doing a science project, and for my specific project, I have chosen the Charge-Coupled Device, or CCD. For one of the sections in this essay, however, I'm meant to describe the advantages and disadvantages of a CCD.
NOTE: THIS IS FOR AN ASTRONOMY UNIT. I do not want to know about how compatible it is with modern day iPhones or that kind of stuff. I want to know the disadvantages and advantages of using it for astronomical purposes-telescopes (esp. The Hubble Space Telescope). A good example would be that it has much higher resolution, and can capture objects much further away, etc.
The CCD replaced photographic plates in astronomy. If you could compare the two and list how the CCD is an improvement, extra props to you.
CCD's allow for electronic capture of photons, which in turn can be manipulated mathematically (by software) to represent data in various formats. Something that film can't do directly. CCD's offer greater resolution than film, images from CCD's can be stacked and used to enhance any given image, which is nearly impossible to do in film. CCD's also record data linearly, while film records data non-linearly.
The major downside to CCD's, it requires quite a bit of up front cost for not just the imager, but the software and computer to use the information. And the training to understand how to use the equipment.
Hmm. I lived through that, but my friend was a radio astronomer not an optical one so I don't remember all the details.
Early CCDs were one-dimensional like in a scanner or fax machine, so you could only use them in a spectrograph.
The big advantage was digital readout. Then CCDs got larger and larger and more sensitive until they could compete with film. I think astronomers were using them early before photographers. They were also very expensive and needed complicated electronics to read them out.
There's/was an issue with charge leaking out, but you could keep reading the CCD and accumulate the image digitally, then go back to collecting photons.
CCDs are now more sensitive than film - they can detect a single photon, while I think for sensitive film it takes about 9.
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