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Atmospheric turbulence profiling with SLODAR using multiple adaptive optics wavefront sensors.

Lianqi Wang¹, Matthias Schöck, Gary Chanan

¹Thirty Meter Telescope Project, Pasadena, California 91125, USA. lianqiw@tmt.org

|April 12, 2008

Summary

The slope detection and ranging (SLODAR) method profiles atmospheric turbulence using wavefront sensor data. This study enhances SLODAR with wind profiling for improved turbulence altitude resolution and velocity measurements.

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Area of Science:

Astronomy
Atmospheric Physics

Background:

The slope detection and ranging (SLODAR) method is used to reconstruct atmospheric turbulence profiles.
Shack-Hartmann wavefront sensors measure wavefront slopes, which are key inputs for SLODAR.
Adaptive optics systems require accurate turbulence profiling for optimal performance.

Purpose of the Study:

To present data reduction methods and results from SLODAR observations using the Palomar multiple guide star unit (MGSU).
To investigate the integration of wind profiling with SLODAR for enhanced turbulence analysis.
To assess the improvements in height resolution and wind velocity measurements offered by combined SLODAR and wind profiling.

Main Methods:

Utilized time-averaged spatial cross-correlations of wavefront slopes from Shack-Hartmann sensors.
Employed the Palomar multiple guide star unit (MGSU) as a testbed for SLODAR turbulence altitude profiling.
Incorporated delayed wavefront cross-correlations for wind profiling analysis alongside SLODAR.

Main Results:

Successfully applied SLODAR to reconstruct atmospheric turbulence profiles from MGSU data.
Demonstrated that wind profiling analysis improves the height resolution of SLODAR.
Obtained wind velocities for the identified turbulent layers, providing additional atmospheric information.

Conclusions:

The SLODAR method, enhanced with wind profiling, provides a robust approach for characterizing atmospheric turbulence.
The MGSU served as an effective platform for validating and advancing SLODAR techniques.
This integrated method offers significant improvements in understanding turbulence dynamics for applications like adaptive optics.