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Perfectly understood non-uniformity: methods of measurement and uncertainty of uniform sources
Author(s): Joe Jablonski; Dan Scharpf; Saurabh Rabade; Luke Dobrowski; Chris Durell; Jeff Holt
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Paper Abstract

Uniformity from Lambertian optical sources such as integrating spheres is often trusted as absolute at levels of 98% (+/- 1%) or greater levels. In the progression of today’s sensors and imaging system technology that 98% uniformity level is good, but not good enough to truly optimize pixel-to-pixel and sensor image response. The demands from industry are often for “perfect” uniformity (100%) which is not physically possible, however, perfectly understood non-uniformity is possible. A barrier to this concept is that the definition and measurement equipment of uniformity measurements often need to be very specific to the optical prescription of the unit under test. Additionally, the resulting data are often a relativistic data set, assigned to an arbitrary reference, but not actually given an expression of uncertainty with a coverage factor. This paper discusses several optical measurement methods and numerical methods that can be used to quantify and express uniformity so that it has meaning to the optical systems that will be tested, and ultimately, that can be related to the Guide to the Expression of Uncertainty in Measurement (GUM) to provide an estimated uncertainty. The resulting measurements can then be used to realize very accurate flat field image corrections and sensor characterizations.

Paper Details

Date Published: 13 May 2019
PDF: 13 pages
Proc. SPIE 10980, Image Sensing Technologies: Materials, Devices, Systems, and Applications VI, 109800I (13 May 2019); doi: 10.1117/12.2519038
Show Author Affiliations
Joe Jablonski, Labsphere, Inc. (United States)
Dan Scharpf, Labsphere, Inc. (United States)
Saurabh Rabade, Labsphere, Inc. (United States)
Luke Dobrowski, Labsphere, Inc. (United States)
Chris Durell, Labsphere, Inc. (United States)
Jeff Holt, Labsphere, Inc. (United States)


Published in SPIE Proceedings Vol. 10980:
Image Sensing Technologies: Materials, Devices, Systems, and Applications VI
Nibir K. Dhar; Achyut K. Dutta; Sachidananda R. Babu, Editor(s)

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