Ccd Architectures; Full Frame; Frame Transfer - Roper Photometric Owner's Manual

Image travel/parallel shift
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CCD
Architectures

Full frame

Full Frame

Frame Transfer

Time Delay Integration
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Three types of CCD imagers are used for quantitative electronic imaging. CCD
Architectures illustrates basic CCD structures that are in current use.

CCD Architectures

Frame transfer
Image
The standard full-frame CCD imager has the simplest architecture. The parallel
register is used for photon exposure, charge integration, and charge transport. A
shutter is used to control the exposure and to block light during readout,
preventing charge smearing.
The frame-transfer CCD imager has a parallel register divided into two distinct
areas. The area at the far end of the parallel register is the image array, where
images are focused and integrated. The other area, the storage array, is identical
in size and is covered with an opaque mask to provide temporary storage for
collected charge.
After the image array is exposed to light, the entire electronic image is rapidly
shifted to the storage array. While the masked storage array is read, the image
array may integrate charge for the next image. A frame-transfer CCD imager can
operate continuously without a shutter at a high rate.
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Mask
Storage
Photosite
Chapter 3. Advanced CCD Theory
Interline transfer
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