Background temperature effect to range performance of large F-number uncooled infrared cameras


  1. Laou, P.
Corporate Authors
Defence Research and Development Canada, Valcartier Research Centre, Quebec QC (CAN)
In earlier studies, it was shown in modeling that range performance of cameras with high resolution detectors could outperform those with lower resolution, even with larger F# optics (For example F#>1). However, background temperature of the scene, which affects the sensitivity of detectors, was not considered in these studies. In this work, range performance of uncooled infrared imaging systems were estimated with the use of NvThermIP tool with background temperature consideration. We showed that uncooled IR imaging systems with small pixel pitch, high resolution FPAs could outperform those with larger pitch FPAs at lower resolution in targeting tasks. This is still valid even (1) with negative impact to detail resolving performance from diffraction effect caused by smaller pitch and larger F#; (2) with negative impact to signal throughout caused by larger F#; and (3) with negative impact to FPA thermal sensitivity caused by lower background temperatures. These results mean that, for some applications such as soldier systems, acceptable range performance even in cold weather can be obtained from compact, lightweight infrared imaging systems with the use large F# optics, and high resolution, small pixel pitch detector arrays.

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uncooled infrared detectors;range performance
Report Number
DRDC-RDDC-2014-R52 — Scientific Report
Date of publication
01 Aug 2014
Number of Pages
Electronic Document(PDF)

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