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Proceedings Paper

Coded Hadamard Hartmann Sensor
Author(s): A. Huiser; Bernhard Braunecker
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Paper Abstract

The Hartmann test to measure wavefronts is much more powerful than generally assumed. Its results need not to be worse than interferometric methods. Various authors have already demonstrated this fact and also our own work points in that direction. Here we would present an extension of the Hartmann test that increases its performance at low light levels. The traditional Hartmann test scans the aperture of the wave or lens to be measured with a single hole in an opaque screen. It is equally well possible to use a complete set of screens with any number of holes. By adequately adding the measurement results for each of the screens the contribution of each of the holes can be extracted. Thus the wave front can be reconstructed. The advantage of this method is a significant increase in signal to noise ratio provided the noise is signal independent.

Paper Details

Date Published: 1 July 1990
PDF: 2 pages
Proc. SPIE 1319, Optics in Complex Systems, (1 July 1990); doi: 10.1117/12.34888
Show Author Affiliations
A. Huiser, Wild Leitz AG (Switzerland)
Bernhard Braunecker, Wild Leitz AG (Switzerland)

Published in SPIE Proceedings Vol. 1319:
Optics in Complex Systems
F. Lanzl; H.-J. Preuss; G. Weigelt, Editor(s)

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