Abstract

la Perpendicular segment-to-segment tilt correlations for the Keck Telescope, caused by atmospheric turbulence. Here, “perpendicular” refers to that tilt component perpendicular to the line connecting the segment centers. Horizontal axis is separation in units of the segment diameter (1.64 m). The full 10 meter baseline was not reached because of limitations on the detector size. Sampling was at 91 Hz for 164 seconds. Tilts were corrected for telescope drift by removing global linear trend. Theoretical curves (after Takato and Yamaguchi 1995) are labeled with assumed outer scale; curve marked “Kolmogorov” is for infinite outer scale. Data points are from a representative run; a series of 28 runs from May 1994 and August 1995 shows similar results, with the average value of the outer scale less than 200 m.

© 1996 Optical Society of America