Some Ideas On Ruling Engine Control Systems

Donald N.B. Hall

doi:10.1117/12.965671

10 February 1981 Some Ideas On Ruling Engine Control Systems

Donald N.B. Hall

Proceedings Volume 0240, Periodic Structures, Gratings, Moire Patterns, and Diffraction Phenomena I; (1981) https://doi.org/10.1117/12.965671
Event: 24th Annual Technical Symposium, 1980, San Diego, United States

Abstract

The magnitudes of various effects which may lead to wavefront errors in gratings ruled on the Harrison 'C' engine,and which are not corrected by the translation servo loop, are evaluated. It appears that thermal expansion is not a problem with the current level of temperature control (± 5 x 10 -3 C) and that variations in the refractive index of air could be compensated to the 10 nm level. However an interferometer which permits direct monitoring of the spacing between the diamond carriage assembly and the reference fused silica straightedge indicates larger wavefront errors may arise because of the present diamond carriage support.

Citation Download Citation

Donald N.B. Hall "Some Ideas On Ruling Engine Control Systems", Proc. SPIE 0240, Periodic Structures, Gratings, Moire Patterns, and Diffraction Phenomena I, (10 February 1981); https://doi.org/10.1117/12.965671

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