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Bring Back Super CCD Technology!

Started 10 months ago | Discussions thread
Truman Prevatt
Truman Prevatt Forum Pro • Posts: 14,596
Re: Bring Back Super CCD Technology!
5

CCD hasn't gone away. It is used for highly specialized applications. For example the detectors on the James Webb uses CCDs.

https://webb.nasa.gov/content/observatory/instruments/nircam.html

At one time CCD's were coined as "bucket brigades." Each site collected charge and then it was marched off chip like passing a bucket of electrons to the exterior where surrounding circuitry would process the data. In CMOS the amplifiers and ADC's are on chip in the form of CMOS transistors and the digital data is read off the chip in "parallel."

The big advantage of CMOS over CCD for consumer cameras is power consumption and expense of fabrication. On the other hand CCD is much lower noise and more sensitive which is why the Hubble and the Web use CCD cameras most precision instruments use CCD. The down side of CCD is it is more expensive to produce and much more power hungry. That is why it has disappeared in consumer cameras with the exception of maybe those for astrophotography. CCD cameras are uniquely suited for long exposure deep sky photography because of their low noise profile - especially when cooled.

https://www.flir.com/support-center/iis/machine-vision/knowledge-base/key-differences-between-ccd-and-cmos-imaging-sensors/

https://www.skyatnightmagazine.com/top-astronomy-kit/best-ccd-cameras-astrophotography/

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