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Proceedings Paper

Versatile cryogenic rotary-positioning systems
Author(s): Robert Birner; Dieter Werner Sodeikat; U. Ruppert
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Paper Abstract

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.

Paper Details

Date Published: 1 November 1990
PDF: 11 pages
Proc. SPIE 1340, Cryogenic Optical Systems and Instruments IV, (1 November 1990); doi: 10.1117/12.23058
Show Author Affiliations
Robert Birner, Messerschmitt-Boelkow-Blohm GmbH (Germany)
Dieter Werner Sodeikat, Messerschmitt-Boelkow-Blohm GmbH (Germany)
U. Ruppert, Freie Univ. Berlin (Germany)


Published in SPIE Proceedings Vol. 1340:
Cryogenic Optical Systems and Instruments IV
Ramsey K. Melugin; Gerald R. Pruitt, Editor(s)

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