source to develop a vertical line above and below its exact area. In addition, the CCD can not be used to gather light while it is reading out. A frame transfer CCD solves both problems: it has a protected, not light sensitive, location consisting of as many cells as the location exposed to light. Typically, this location is covered by a reflective product such as aluminium.
When the direct exposure time is up, the cells are transferred extremely rapidly to the covert location. At the same time, the exposed part of the CCD is collecting light once again, so no delay takes place in between successive direct exposures. A Reliable Source of such a CCD is the greater cost: the cell area is
basically doubled, and more complex control electronic devices are needed. Intensified charge-coupled device [edit] An intensified charge-coupled device (ICCD)is a CCD that is optically linked to an image intensifier that is installed in front of the CCD. These three aspects are mounted one close behind the other in the discussed series. The photons which are originating from the source of light fall onto the photocathode, consequently creating photoelectrons.
The photoelectrons are accelerated towards the MCP by an electrical control voltage, applied in between photocathode and MCP. The electrons are increased within the MCP and afterwards sped up towards the phosphor screen. An image intensifier naturally consists of a shutter performance: If the control voltage between the photocathode and the MCP is reversed, the released photoelectrons are not sped up towards the MCP however return to the photocathode. Hence, no electrons are multiplied and given off by the MCP, no electrons are going to the phosphor screen and no light is emitted from the image intensifier.
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