Modular removable precision mechanism for alignment of an FUV spatial heterodyne interferometer

Details Modular removable precision mechanism for alignment of an FUV spatial heterodyne interferometer Modular removable precision mechanism for alignment of an FUV spatial heterodyne interferometer

Oct 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991spie.1549..308t&link_type=abstract

In: EUV, X-ray, and gamma-ray instrumentation for astronomy II; Proceedings of the Meeting, San Diego, CA, July 24-26, 1991 (A93

Computer Science

Sound

1

Instrument Compensation, Interferometers, Optical Heterodyning, Spaceborne Experiments, Structural Weight, Ultraviolet Spectrometers, Far Ultraviolet Radiation, Feedback Control, Sounding Rockets, Weight Reduction

Scientific paper

Spaceflight optical instruments have two conflicting requirements. They need to be both rigid and lightweight. In addition, for interferometric far ultraviolet spectrometers, the requirements for precision positioning are more severe than for conventional spectrometers. To meet the challenge of lightweight optical instruments, a modular adjustment mechanism was developed to position two orthogonal axes of a universal three-axis gimbal support system with a positioning accuracy on the order of 10 arc seconds. The mechanism was designed as a self-contained assembly which can be removed after final alignment of a spacebound optical instrument to reduce its in-flight mass. To demonstrate the concept, a number of these assemblies were made and mounted on two of the positioning axes of a far ultraviolet spatial heterodyne interferometer. A shaft clamp was used on each positioning axis to retain the adjusted position. This paper describes the design of the mechanism and presents optical test results.

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