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Optical Engineering

Real-time photon beam localization methods using high-resolution imagers and parallel processing using a reconfigurable system
Author(s): Peter F. I. Scott; Anton S. Kachatkou; Nicholas R. C. Kyele; Roelof G. Van Silfhout
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Paper Abstract

We report on a high-precision, real-time photon beam localization and characterization instrument. The device uses a 2-D (image) sensor coupled to a hardware image processing system. The system uses two different algorithms that both run in parallel on field programmable gate array logic using data from a single active pixel array sensor. The first algorithm mimics the ubiquitous quadrant photodiode design that features high precision but has limited range and requires calibration cycles. The second algorithm calculates the location of the center of gravity. We compare the merits of both methods by measuring the displacement of a light beam. It is shown that the center of gravity (or centroid) method offers the advantage of large dynamic range with excellent linearity. By the method of operating on identical image data captured from these experiments, we aim to investigate both algorithms and compare their performance.

Paper Details

Date Published: 1 July 2009
PDF: 14 pages
Opt. Eng. 48(7) 073601 doi: 10.1117/1.3158957
Published in: Optical Engineering Volume 48, Issue 7
Show Author Affiliations
Peter F. I. Scott, The Univ. of Manchester (United Kingdom)
Anton S. Kachatkou, The Univ. of Manchester (United Kingdom)
Nicholas R. C. Kyele, The Univ. of Manchester (United Kingdom)
Roelof G. Van Silfhout, The Univ. of Manchester (United Kingdom)

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