Accurate position sensing of defocused beams using simulated beam templates

Abdul Ahad Sami Awwal; James V. Candy; Chris A. Haynam; Clifford Clay Widmayer; Erlan S. Bliss; Scott C. Burkhart

doi:10.1117/12.563653

4 November 2004 Accurate position sensing of defocused beams using simulated beam templates

Abdul Ahad Sami Awwal, James V. Candy, Chris A. Haynam, Clifford Clay Widmayer, Erlan S. Bliss, Scott C. Burkhart

Proceedings Volume 5556, Photonic Devices and Algorithms for Computing VI; (2004) https://doi.org/10.1117/12.563653
Event: Optical Science and Technology, the SPIE 49th Annual Meeting, 2004, Denver, Colorado, United States

Abstract

In position detection using matched filtering one is faced with the challenge of determining the best position in the presence of distortions such as defocus and diffraction noise. This work evaluates the performance of simulated defocused images as the template against the real defocused beam. It was found that an amplitude modulated phase-only filter is better equipped to deal with real defocused images that suffer from diffraction noise effects resulting in a textured spot intensity pattern. It is shown that the there is a tradeoff of performance dependent upon the type and size of the defocused image. A novel automated system was developed that can automatically select the right template type and size. Results of this automation for real defocused images are presented.

Citation Download Citation

Abdul Ahad Sami Awwal, James V. Candy, Chris A. Haynam, Clifford Clay Widmayer, Erlan S. Bliss, and Scott C. Burkhart "Accurate position sensing of defocused beams using simulated beam templates", Proc. SPIE 5556, Photonic Devices and Algorithms for Computing VI, (4 November 2004); https://doi.org/10.1117/12.563653

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