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Image motion compensation on the Spacelab 2 Solar Optical Universal Polarimeter /SL2 SOUP/The SOUP experiment on Spacelab 2 includes a 30 cm visible light telescope and focal plane package mounted on the Instrument Pointing System (IPS). Scientific goals of the experiment dictate pointing stability requirements of less than 0.05 arcsecond jitter over periods of 5-20 seconds. Quantitative derivations of these requirements from two different aspects are presented: (1) avoidance of motion blurring of diffraction-limited images; (2) precise coalignment of consecutive frames to allow measurement of small image differences. To achieve this stability, a fine guider system capable of removing residual jitter of the IPS and image motions generated on the IPS cruciform instrument support structure has been constructed. This system uses solar limb detectors in the prime focal plane to derive an error signal. Image motion due to pointing errors is compensated by the agile secondary mirror mounted on piezoelectric transducers, controlled by a closed-loop servo system.
Document ID
Document Type
Conference Proceedings
Tarbell, T. D.
(Lockheed Missiles and Space Co. Palo Alto, CA, United States)
Duncan, D. W.
(Lockheed Missiles and Space Co. Palo Alto, CA, United States)
Finch, M. L.
(Lockheed Research Laboratories Palo Alto, Calif., United States)
Spence, G.
(USAF, Geophysics Laboratory, Sunspot N. Mex., United States)
Date Acquired
August 11, 2013
Publication Date
January 1, 1981
Subject Category
Spacecraft Instrumentation
Meeting Information
Meeting: Seminar on Shuttle pointing of electro-optical experiments
Location: Los Angeles, CA
Start Date: February 10, 1981
End Date: February 13, 1981
Accession Number
Funding Number(s)
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