Proceedings PaperAVIRIS Scan Drive Design And Performance
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The Airborne Visible/Infrared Imaging Spectrometer (AVIRIS) images the ground with an instantaneous field of view (IFOV) of 1 mrad. The IFOV is scanned 30 deg from left to right to provide the cross-track dimension of the image, while the aircraft's motion provides the along-track dimension. The scanning frequency is 12 Hz, with a scan efficiency of 70%. The scan mirror has an effective diameter of 5.7 in., and its positional accuracy is a small fraction of a milliradian of the nominal position-time profile. This paper describes the design and performance of the scan drive mechanism. Trade-offs among various approaches are discussed, and the reasons given for the selection of the cam drive. The salient features of the design are presented. The method of measuring performance is described, and the performance results are given.