Abstract

The application of multiplex spectrometry to cryogenically cooled LWIR extrinsic photodetectors is limited by system noise. This noise limitation results in a detector NEP that is directly proportional to bandwidth. Therefore, multiplex schemes that require increased bandwidth are not productive of real advantage. However, doubly encoded systems that are based on 2n − 1 or n + N − 1 measurements have the potential to provide a real throughput gain proportional to the number of elements used on the throughput matrix.

© 1974 Optical Society of America

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