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Optical Engineering

Infrared detector size: how low should you go?
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Paper Abstract

In the past five years, significant progress has been accomplished in the reduction of infrared detector pitch and detector size. Recently, longwave infrared (LWIR) detectors in limited quantities have been fabricated with a detector pitch of 5 μm. Detectors with 12-μm pitch are now becoming standard in both midwave infrared (MWIR) and LWIR sensors. Persistent surveillance systems are pursuing 10-μm detector pitch in large format arrays. The fundamental question that most system designers and detector developers desire an answer to is: "How small can you produce an infrared detector and still provide value in performance?" If a system is mostly diffraction-limited, then developing a smaller detector is of limited benefit. If a detector is so small that it does not collect enough photons to produce a good image, then a smaller detector is not much benefit. Resolution and signal-to-noise are the primary characteristics of an imaging system that contribute to targeting, pilotage, search, and other human warfighting task performance. We investigate the task of target discrimination range performance as a function of detector size/pitch. Results for LWIR and MWIR detectors are provided and depend on a large number of assumptions that are reasonable.

Paper Details

Date Published: 5 June 2012
PDF: 7 pages
Opt. Eng. 51(6) 063202 doi: 10.1117/1.OE.51.6.063202
Published in: Optical Engineering Volume 51, Issue 6
Show Author Affiliations
Ronald G. Driggers, U.S. Naval Research Lab. (United States)
Richard H. Vollmerhausen, Univ. of Delaware (United States)
Joseph P. Reynolds, U.S. Army Night Vision & Electronic Sensors Directorate (United States)
Jonathan D. Fanning, U.S. Army Night Vision & Electronic Sensors Directorate (United States)
Gerald C. Holst, JCD Publishing (United States)

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