  Aging GONG second generation cameras (Silicon Mountain Design(TM) cameras)
were planned to be replaced after their long service of more than a decade.
This prompted a market-wide search for a potential replacement detector to meet
the GONG science requirements. This report provides some history of the search
process, a comparison between CMOS and CCD type sensors and then a quantitative
evaluation of potential candidates to arrive at final selection. Further, a
feasibility study of the selected sensor for adaptation to GONG optical system
was done and sensor characteristics were independently verified in the
laboratory. This technical report gives description of these studies and tests.
