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1 November 1990 Versatile cryogenic rotary-positioning systems
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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.
© (1990) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Robert Birner, Dieter Werner Sodeikat, and U. Ruppert "Versatile cryogenic rotary-positioning systems", Proc. SPIE 1340, Cryogenic Optical Systems and Instruments IV, (1 November 1990);

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