6 July 2006 Differentiating secondary mirror tilt and decenter through off-axis wavefront sensing and aberration measurement
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Abstract
The alignment of a telescope consisting of 2 or more mirrors with powered surfaces is critical to system performance. For on axis images, secondary mirror tilt and decenter both predominately produce coma, and therefore, either can be used to correct coma. Consequently, for systems that operate over relatively narrow fields of view, it is not necessary to differentiate between secondary tilt and decenter. However, for systems utilizing wider fields of view, correcting tilt with decenter (or decenter with tilt) can result in large aberration variation off-axis. Details of a technique for differentiating between secondary mirror decenter and tilt through the use of off-axis wavefront sensing, aberration calculation, and alignment sensitivity modeling are presented.
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Michael DiVittorio, "Differentiating secondary mirror tilt and decenter through off-axis wavefront sensing and aberration measurement", Proc. SPIE 6273, Optomechanical Technologies for Astronomy, 62733D (6 July 2006); doi: 10.1117/12.672856; https://doi.org/10.1117/12.672856
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