Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990spie.1236..912m&link_type=abstract
IN: Advanced technology optical telescopes IV; Proceedings of the Meeting, Tucson, AZ, Feb. 12-16, 1990. Part 2 (A91-23201 08-89
Astronomy and Astrophysics
Astronomy
Equipment Specifications, Gratings (Spectra), Interferometers, Mirrors, Telescopes, Astronomical Photometry, Honeycomb Structures, Laser Interferometry, Optical Equipment
Scientific paper
A 16 meter optical telescope is described. The telescope tube has a large and heavy truss that creates deformation; when the telescope tube is rotating, four servos push forward or pull back the main mirror truss to automatically compensate for the deformation. To obtain high image quality and tracking and pointing accuracy, dynamic deflection must be measured and the measuring value should be fed back to servo motors to provide automatic compensation until the system deflection is zero. The interferometer of the automatic compensation system is fixed at the rear of the main mirror to avoid influencing the main optical path. Details are discussed on the measurement of the relative deflection, the honeycomb mirror, and a scheme for main mirror measurement.
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