Design and development of the image scanner for Lineate Imaging Near Ultraviolet Spectrometer (LINUS)
Kompatzki, Ricardo C.
Davis, D. Scott
Olsen, Richard Christopher
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The Lineate Imaging Near Ultraviolet Spectrometer (LINUS) is a spectral imager that works in the ultraviolet region of the spectrum, and its purpose is to study atmospheric gas plumes. This thesis project is part of an ongoing effort to field-test the first version of LINUS by mid-2001. It concentrates in the development of the ultra-precise servo system that controls the pointing/scanning system of the instrument. The closed-loop angular-position servo is controlled by a dedicated motion controller board that is installed in the host computer. Control of the servo is achieved through proportional- integral-derivative (PID) algorithms built into the hardware and firmware of the motion controller board. The servo has been designed to an angular resolution of 9 seconds of arc, and was tuned for a step of 1000 counts. Static and dynamic tests were conducted and showed that the servo is stable and accurate. The tested accuracy of the servo is well within the design goal of one half encoder count.
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