Share Email Print
cover

Proceedings Paper

Shot noise performance of Hartmann and shearing interferometer wavefront sensors
Author(s): Byron M. Welsh; Brent L. Ellerbroek; Michael C. Roggemann; Timothy L. Pennington
Format Member Price Non-Member Price
PDF $14.40 $18.00
cover GOOD NEWS! Your organization subscribes to the SPIE Digital Library. You may be able to download this paper for free. Check Access

Paper Abstract

The performance of a ground-based optical imaging system is severely degraded from the diffraction limit by the random effects of the atmosphere. Adaptive optics techniques have been used to compensate for atmospheric turbulence effects. A critical component in the adaptive optics system is the wavefront sensor. Presently, two types of sensors are common: the Hartmann-Shack wavefront sensor and the shearing interferometer wavefront sensor. In this paper we make a direct performance comparison of these two sensors. The performance calculations are restricted to common configurations of these two sensors and the fundamental limits imposed by shot noise and atmospheric effects. These two effects encompass the effects of extended reference beacons and sensor subaperture spacings larger than the Fried parameter, ro. Our results indicate comparable performance for good seeing conditions, and small beacons. However, for poor seeing conditions and extended beacons, the Hartmann sensor has lower error levels than the Shearing interferometer.

Paper Details

Date Published: 25 August 1995
PDF: 12 pages
Proc. SPIE 2534, Adaptive Optical Systems and Applications, (25 August 1995); doi: 10.1117/12.217746
Show Author Affiliations
Byron M. Welsh, Air Force Institute of Technology (United States)
Brent L. Ellerbroek, Air Force Phillips Lab. (United States)
Michael C. Roggemann, Air Force Institute of Technology (United States)
Timothy L. Pennington, Air Force Phillips Lab. (United States)


Published in SPIE Proceedings Vol. 2534:
Adaptive Optical Systems and Applications
Robert K. Tyson; Robert Q. Fugate, Editor(s)

© SPIE. Terms of Use
Back to Top