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Proceedings Paper

High Accuracy Motor Controller For Positioning Optical Filters In The Claes Spectrometer
Author(s): John B. Thatcher
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Paper Abstract

A brushless DC motor is ideally suited as a filter positioner in a cryogenic infrared spectrometer. Unlike stepper motors, a DC torque motor has infinite resolution for setting an etalon filter to any desired angle. However, the very precise angular positioning and rapid step response needed place rather constricting requirements on the electronic controller. Accuracy, stability, fast step response, and mechanism mechanical characteristics combine to pose a unique electronic design challenge. This paper describes one controller developed for the Cryogenic Limb Array Etalon Spectrometer (CLAES) on the Upper Atmospheric Re-search Satellite (UARS). An 18-bit control loop provides high accuracy, resolution, and stability. Details on loop stability and signal/noise considerations are discussed. Dynamic computer interaction allows the user to optimize step response.

Paper Details

Date Published: 27 April 1988
PDF: 7 pages
Proc. SPIE 0973, Cryogenic Optical Systems and Instruments III, (27 April 1988); doi: 10.1117/12.948391
Show Author Affiliations
John B. Thatcher, Lockheed Palo Alto Research Laboratory (United States)

Published in SPIE Proceedings Vol. 0973:
Cryogenic Optical Systems and Instruments III
Ramsey K. Melugin; Warren G. Pierce, Editor(s)

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