Accession Number:

ADA273838

Title:

Performance Impacts for Actuator Misalignments and Failures in Large- Aperture Adaptive-Optic Telescopes

Descriptive Note:

Master's thesis,

Corporate Author:

AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH

Personal Author(s):

Report Date:

1993-12-01

Pagination or Media Count:

99.0

Abstract:

Large-aperture telescopes require adaptive optics in order to compensate for atmospheric turbulence which would otherwise negate the resolution advantages of using large apertures. This investigation analyzes the impacts of misalignments and failures, in the deformable mirror actuators, upon the performance of such systems. A numerical simulation of a standard adaptive optics system is used to generate characteristic optical transfer function OTF and signal-to-noise ratio SNR performance metrics. The performance impacts of the misalignments are shown to be dependent upon the Fried parameter effective telescope diameter, the source object brightness, and the control system time delay. The degree of performance degradation is directly related to the relative value of the Fried parameter to the deformable mirror displacement misalignment cases and the effective actuator spacing actuator failure cases. The results indicate that the impact of misalignments and failures is small when seeing conditions are good or the percentage misalignments and failures are small.

Subject Categories:

  • Atmospheric Physics
  • Optical Detection and Detectors

Distribution Statement:

APPROVED FOR PUBLIC RELEASE