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Radiometric uncertainty of radiance measured with infrared cameras under variable ambient conditions
FOI, Swedish Def Research Agency, SE-58111 Linkoping, Sweden.
Linköping University, Department of Electrical Engineering. Linköping University, Faculty of Science & Engineering.
FOI, Swedish Def Research Agency, SE-58111 Linkoping, Sweden.
2015 (English)In: MODELING ASPECTS IN OPTICAL METROLOGY V, Society of Photo-optical Instrumentation Engineers (SPIE) , 2015, Vol. 9526, no 95260EConference paper (Refereed)
Abstract [en]

Radiometric calibration and non-uniformity correction are key operations in a signature measurement, which is a special challenge in the infrared range where a large number of parameters need to be characterized. The radiation hitting the cameras pixels will not only be due to the target, but will also depend on the atmosphere and optical components like lens and spectral filters. To obtain broadband radiative properties of a target, the spectral properties of these components must be accurately characterized. In addition to signal contributions from the incident radiation, the pixels digital numbers will also depend on the individual responses of the pixels. Results are presented for an infrared camera of the following parameters: stabilization period, dynamic response, dynamic range, ambient temperature dependence and non-uniformity. In radiometric calibrations using area blackbody sources, an estimate of the sensor signal is obtained by pixel averaging (which reduces the influence of non-uniformity), and the spectral distributions of the sources are known (via the Planck distribution). These conditions do not normally apply for signature measurements e.g. of small hot spots involving only a few pixels. The measurement uncertainty is compared between calibrations based on mean values and pixel-wise calibration. A discussion is given of the effects of unknown spectral distributions on the measurement uncertainty.

Place, publisher, year, edition, pages
Society of Photo-optical Instrumentation Engineers (SPIE) , 2015. Vol. 9526, no 95260E
Series
, SPIE Proceedings, ISSN 0277-786X
Keyword [en]
infrared; stabilization period; dynamic response; dynamic range; radiance; ambient temperature dependence; measurement uncertainty; non-uniformity; atmospheric transmission
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:liu:diva-120481DOI: 10.1117/12.2184861ISI: 000357949800009ISBN: 978-1-62841-686-2OAI: oai:DiVA.org:liu-120481DiVA: diva2:845513
Conference
Conference on Modeling Aspects in Optical Metrology V
Available from: 2015-08-12 Created: 2015-08-11 Last updated: 2015-08-12

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Department of Electrical EngineeringFaculty of Science & Engineering
Electrical Engineering, Electronic Engineering, Information Engineering

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ReferencesLink to record
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