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Proceedings Paper

Effects of Lambertian sources design on uniformity and measurements
Author(s): Nadine Cariou; Chris Durell; Greg McKee; Dylan Wilks; Wilfried Glastre
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Paper Abstract

Integrating sphere (IS) based uniform sources are a primary tool for ground based calibration, characterization and testing of flight radiometric equipment. The idea of a Lambertian field of energy is a very useful tool in radiometric testing, but this concept is being checked in many ways by newly lowered uncertainty goals. At an uncertainty goal of 2% one needs to assess carefully uniformity in addition to calibration uncertainties, as even sources with a 0.5% uniformity are now substantial proportions of uncertainty budgets. The paper explores integrating sphere design options for achieving 99.5% and better uniformity of exit port radiance and spectral irradiance created by an integrating sphere. Uniformity in broad spectrum and spectral bands are explored. We discuss mapping techniques and results as a function of observed uniformity as well as laboratory testing results customized to match with customer’s instrumentation field of view. We will also discuss recommendations with basic commercial instrumentation, we have used to validate, inspect, and improve correlation of uniformity measurements with the intended application.

Paper Details

Date Published: 11 November 2014
PDF: 11 pages
Proc. SPIE 9241, Sensors, Systems, and Next-Generation Satellites XVIII, 924116 (11 November 2014); doi: 10.1117/12.2066739
Show Author Affiliations
Nadine Cariou, Labsphere, Inc. (France)
Chris Durell, Labsphere, Inc. (United States)
Greg McKee, Labsphere, Inc. (United States)
Dylan Wilks, Labsphere, Inc. (United States)
Wilfried Glastre, Bertin Technologies (France)

Published in SPIE Proceedings Vol. 9241:
Sensors, Systems, and Next-Generation Satellites XVIII
Roland Meynart; Steven P. Neeck; Haruhisa Shimoda, Editor(s)

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