29 September 2004 Mechanical jitter measurement results for large ground-based telescopes
Author Affiliations +
In a major effort to understand limitations on the performance of ground-based optical telescopes and gimbals, the Air Force Research Laboratory (AFRL) and a contractor support team measured the vibration and jitter of several large telescopes. These measurements were conducted over a ten-year period with high bandwidth accelerometers, angular position sensors, and seismometers attached to various locations on the telescopes, mounts, and bases. Measurements were taken over a 0.1 to 1000-Hz bandwidth and at angular tracking velocities between 0.001 and 18.5 degrees per second, single-axis. Jitter power spectral densities (PSD) and root-mean-square (rms) values and ranges were determined for both dynamic tracking and quiescent condition. Many telescopes exhibited near-noise-floor level jitter (i.e., about 10 nanoradians rms) under some conditions in certain bandwidth ranges. Under very high-speed single-axis tracking conditions (i.e., 10.5 - 18.5 degrees per second), jitter often rose to several micro-radians rms. This paper presents and discusses the overall mechanical jitter measurement results obtained for five telescopes with emphasis on two 3.5-meter aperture-class high-tracking rate instruments.
© (2004) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
James W. Mayo, James W. Mayo, } "Mechanical jitter measurement results for large ground-based telescopes", Proc. SPIE 5495, Astronomical Structures and Mechanisms Technology, (29 September 2004); doi: 10.1117/12.550712; https://doi.org/10.1117/12.550712


Low-Cost Enclosure For The Sub-Millimeter Telescope
Proceedings of SPIE (November 02 1983)
The ESO Very Large Telescope Project
Proceedings of SPIE (August 19 1986)
The 42m European ELT: status
Proceedings of SPIE (July 23 2008)
Thermal conditioning of the AEOS Telescope
Proceedings of SPIE (February 03 2003)
A preliminary design for the E-ELT enclosure
Proceedings of SPIE (July 09 2008)
Large telescope project dedicated to an origins survey
Proceedings of SPIE (July 06 2004)
Characterization of wind loading of telescopes
Proceedings of SPIE (July 29 2002)

Back to Top