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Rolled edges and phasing of segmented telescopes.

Natalia Yaitskova¹, Mitchell Troy

¹European Organisation for Astronomical Research in the Southern Hemisphere (ESO), Muenchen, Germany. nyaitsko@eso.org

|February 2, 2011

Summary

Accurate alignment of segmented telescope mirrors is crucial for diffraction-limited performance. This study models how rolled segment edges affect optical alignment accuracy, providing insights for segment polishing requirements.

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Area of Science:

Optical engineering
Astronomy instrumentation

Background:

Segmented telescopes require precise alignment to achieve diffraction-limited imaging.
Optical measurements using starlight are standard for aligning telescope segments.

Purpose of the Study:

To investigate the impact of rolled segment edges on the accuracy of optical alignment for segmented telescopes.
To analyze the piston degree of freedom (phasing) and its sensitivity to edge profiles.

Main Methods:

Developed three models for segment edge profiles based on manufacturer data.
Utilized a simplified Shack-Hartmann optical sensor model to simulate alignment.
Assessed the effect of different edge profiles on phasing accuracy.

Main Results:

Quantified the influence of rolled segment edges on phasing accuracy.
Demonstrated how edge profiles affect the precision of optical alignment.
Provided a basis for estimating residual phasing errors.

Conclusions:

Rolled segment edges significantly impact the accuracy of optical alignment in segmented telescopes.
The developed models and findings can inform segment polishing requirements.
Improved understanding of edge effects leads to better telescope performance.