Computer Science – Performance
Scientific paper
Oct 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982spie..332..198f&link_type=abstract
IN: International Conference on Advanced Technology Optical Telescopes, Tucson, AZ, March 11-13, 1982, Proceedings (A83-30976 13
Computer Science
Performance
Dynamic Loads, Site Selection, Telescopes, Wind Pressure, Wind Velocity Measurement, Anemometers, Atmospheric Temperature, Data Processing, Gust Loads, Pitot Tubes, Pressure Sensors, Wind Effects
Scientific paper
It is pointed out that the next generation of large telescopes will be exposed to higher wind loading as a consequence of reductions in the dome size in relation to the aperture. Thin actively figured mirrors and tighter pointing requirements will make them more susceptible to the general wind loading, including higher frequency components. The figure control and pointing servo loops will call for wider bandwidth and higher gain to maintain good optical performance. Design of these servo loops will require knowledge of the wind power spectra so that loop stability and correction performance can be assessed. A Pitot tube anemometer mounted on a tower at the leading edge of various observing sites and four differential pressure sensors mounted across the mirror plane are used to take wind measurements. The anemometer measurements are made at two different elevations in order to provide site wind vs elevation extrapolation data. Hundred-second measurements, with the data sampled at 50 Hz, are made. Fourier transforms of the data take in a frequency range of 0.02 to 25 Hz.
Forbes Florence
Gabor George
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