Developments In SPRITE Infrared Detectors

J. T. M. Wotherspoon; R. J. Dean; M. D. Johns; T. Ashley; C. T. Elliott; A. M. White

doi:10.1117/12.945012

21 January 1985 Developments In SPRITE Infrared Detectors

J. T. M. Wotherspoon, R. J. Dean, M. D. Johns, T. Ashley, C. T. Elliott, A. M. White

Proceedings Volume 0510, Infrared Technology X; (1985) https://doi.org/10.1117/12.945012
Event: 28th Annual Technical Symposium, 1984, San Diego, United States

Abstract

SPRITE infrared detectors are now established as high performance components for use in thermal imaging systems operating both in the 3-5μm and 8-14μm bands. Such systems are currently under development or in production. This paper reviews the concept of the SPRITE, discusses the method of fabrication and describes their performance. Recent research work, aimed at understanding those factors controlling the spatial resolution, is described. The fundamental component to the Modulation Transfer Function (MTF) is the minority carrier diffusion, however measurements on a number of SPRITE arrays with a range of minority carrier lifetimes have indicated values in excess of this. This has been shown to be due to readout sampling and background radiation effects. As a result 8-14μm SPRITE element geometries have been designed and manufactured which overcome these. In addition for 3-5μm SPRITE, novel element geometries have been researched which have the effect of suppressing the minority carrier diffusion contribution to the MTF. This is particularly important in view of the inherently long lifetimes for 3-5μm SPRITE.

Citation Download Citation

J. T. M. Wotherspoon, R. J. Dean, M. D. Johns, T. Ashley, C. T. Elliott, and A. M. White "Developments In SPRITE Infrared Detectors", Proc. SPIE 0510, Infrared Technology X, (21 January 1985); https://doi.org/10.1117/12.945012

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