CCD imaging devices use a silicon chip which on which a large
array of photoelectric detectors are etched. Each of these detectors
corresponds to a pixel. As light energy falls on these pixels,
a negative charge develops from the photoelectric effect of
the base material. These charges are read out and digitized
in an array corresponding to the image. This is an inherently
slow process, but recent advances in CCD imaging technology
have made CCDs useful for high speed imaging applications.
While the image
quality of CCDs is not yet at the level of film, they provide
some advantages which make them excellent for many applications.
The images are available within seconds, and do not require
a non-renewable medium like film. Information output is digital
and can be easily stored, manipulated, analyzed and printed
with the wide variety of computer based imaging software and
hardware.
Image
Quality of Rotating Mirror
Image
Quality of Gate Intensified CCD
Cordin
manufactures a variety of CCD cameras
which achieve ultra high framing rates by using multiple CCDs
looking through a single lens. These CCDs are triggered in
rapid sequence, and then read out off line to produce a high
speed record. These systems are available in both intensified
and non-intensified configurations.
This
approach enables Cordin systems to achieve much faster framing
rates than CCD or CMOS systems that are based on a single
imaging chip read out very fast.
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