Computer Science
Scientific paper
Nov 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990spie.1340..350b&link_type=abstract
IN: Cryogenic optical systems and instruments IV; Proceedings of the Meeting, San Diego, CA, July 10-12, 1990 (A92-22851 08-31).
Computer Science
Cryogenic Equipment, Infrared Telescopes, Instrument Orientation, Optical Scanners, Positioning Devices (Machinery), Indexes, Pointing Control Systems, Rotation, Thermal Vacuum Tests
Scientific paper
Systems for scan mirror positioning and filter wheel grating and indexing used in the Infrared Background Signature Survey sensor are described. A control loop which incorporates a cryogenic brushless torquer, an ironless inductive position sensor, and associated control electronics is used to achieve precise angular positioning with the angular range of +/- 7.5 deg. The motion programs include step, sawtooth, and staircase operations. A positioning accuracy of greater than 0.03 deg and a position resolution of greater than 0.001 deg have been achieved. Fixation of grating and mirror mechanism during launch is accomplished using short circuiting of motor windings for providing high braking torques. For a filter wheel indexing, the inductive position sensor is replaced by Hall probes, and the torque motor commutation uses Hall sensor signals. The same signals are applied to control the required 12 positions. A Hall sensor located at the filter wheel marks a reference position.
Birner Robert
Ruppert U.
Sodeikat Dieter W.
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