Partitioned IR cell

Abstract This document describes a lead sulphide film detector configuration which is capable of detecting point targets in the presence of cloud-like background more effectively than lead sulphide cells of more conventional design. The results of an experiment which was undertaken to see if small cells of this type could be built and to investigate the background rejection advantage of the partitioned cell are described. The results indicate that partitioned cells are feasible to build by etching techniques. The measurements show that the partitioned cell, indeed, has better background rejection than ordinary cells. The improvement is roughly equivalent to the theoretical predictions.