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Proceedings Paper

Impact of a scene projector array on the nonuniformity of a test article's output image
Author(s): Brian P. Beecken; Thomas J. McElmurry; Thomas R. Greenlee
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Paper Abstract

The contribution of a scene projector array to the nonuniformity of a test article's output image has been calculated. In addition to the inherent nonuniformity of the detector array, the output image nonuniformity is dependent upon the nonuniformity of the projector array and the relative positions of emitter images on the detector array as determined by the sampling ratio. In order to calculate the predicted output nonuniformity, a weighting function was developed that accounts for the different contributions of one emitter to different individual detector elements. It is through this weighting function that parameters such as the sampling ratio, the fill factor of the detector array, the optical blur of the emitters, and the alignment of the emitters with respect to the detectors affect the nonuniformity. A computer program has been written to numerically approximate the weighting function for a user- defined set of parameters. For realistic parameters, a significant contribution to the nonuniformity was found to occur when certain non-integer sampling ratios are used. This nonuniformity is based solely on the relative positions of the emitter images on the detector array and will occur even if the projector array is completely uniform.

Paper Details

Date Published: 19 July 1999
PDF: 13 pages
Proc. SPIE 3697, Technologies for Synthetic Environments: Hardware-in-the-Loop Testing IV, (19 July 1999); doi: 10.1117/12.352916
Show Author Affiliations
Brian P. Beecken, Bethel College (United States)
Thomas J. McElmurry, Bethel College (United States)
Thomas R. Greenlee, Bethel College (United States)


Published in SPIE Proceedings Vol. 3697:
Technologies for Synthetic Environments: Hardware-in-the-Loop Testing IV
Robert Lee Murrer, Editor(s)

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