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Abstract Review
| Corresponding Author |
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| Authors |
| Name | | Affiliation |
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Gary Chanan |
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University of California, Irvine |
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Matthias Schoeck |
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The Thirty Meter Telescope Project |
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| Abstract |
| Session | | 1 (Instrumentation and observations to quantify the magnitude and distribution of atmospheric optical turbulence.) |
| Title | | 'Atmospheric Turbulence Profiling using Multiple Adaptive Optics
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| Abstract | | The Slope Detection And Ranging (SloDAR) method recovers atmospheric
turbulence altitude profiles from the time averaged spatial
cross-correlation of the wavefront slopes measured by Shack Hartmann
wavefront sensors (SHWFS). The Palomar Multi-Guide Star Unit (MGSU) is set up
to test tomographic multiple guide star adaptive optics on the 5-meter
telescope and provides
an ideal test bed for SloDAR turbulence profiling. The MGSU
contains four independent SHWFS cameras. Each pair of cameras (six
pairs in total) was used to perform SloDAR analysis. An engineering run
with natural guide stars was carried out in February 2006. In this
talk we will present the SloDAR profiling results and compare these with
simultaneous DIMM/MASS measurements.
We will also discuss the methods used to deal with such problems as
static aberrations and bright sky backgrounds (with 4x4 pixels in each subaperture).
In addition we performed wind profiling using time delayed
cross-correlations to determine wind speed and direction. We were able
to measure five layers with different altitudes, wind speeds and
directions and to use these results to improve the resolution of the
turbulence profiles by a large factor.
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