Abstract
A historical outline traces the development from the initial experiments using hybrid technologies to present day integrated arrays in volume production, and to the latest developments. The theory of operation of photodiode arrays is explained, showing how sensitive scanned arrays are made possible by the charge integration technique, and describing and comparing the various scanning methods which have been proposed and developed, including serial multiplexing, bucket brigades, CCD, CID etc. The optical and electrical characteristics of arrays are discussed, pointing out the effects of various main limiting factors on array performance. The main fields of application of arrays are presented, together with the considerations relevant to designing systems of various types.

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