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12 September 2003 A sensitive method for detecting vibration in a scene projector test
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An unexpected effect was observed in a data set recently measured at the Kinetic Kill Vehicle Hardware-in-the-loop Simulator (KHILS) facility. A KHILS projector was driven to illuminate a contiguous block of emitters, with all other emitters turned off. This scene was measured with a two-color IR sensor. A sequence of 100 images was recorded, and certain statistics were computed from the image sequence. After measuring and analyzing these images, a “border” was observed with a particularly large standard deviation around the bright rectangular region. The pixels on the border of the region were much noisier than either inside or outside of the bright region. Although several explanations were possible, the most likely seemed to be a small vibration of either the sensor or projector. The sensor, for example, uses a mechanical cyro-cooler, which produces a vibration that can be felt by hand. Further analyses revealed an erratic motion of the position of objects in the image with amplitude of a few tents of the detector pitch. This small motion is sufficient to produce large fluctuations in the image pixel values in regions that have a large radiance gradient - such as suggest that the standard deviation of a “block image” sequence is easy to compute and will show the characteristic effect in the presence of image motion as small as a fraction of the detector pitch.
© (2003) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Breck A. Sieglinger, David S. Flynn, Richard Bryan Sisko, and Rhoe A. Thompson "A sensitive method for detecting vibration in a scene projector test", Proc. SPIE 5092, Technologies for Synthetic Environments: Hardware-in-the-Loop Testing VIII, (12 September 2003);


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