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13 October 1986 Real-Time Amplitude And Phase Integration For Diffraction Limited Imaging Discrete Photon Case
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Abstract
Both video raster detectors and newly developed 2-D photoelectron event locators are now employed to collect data at large astronomical telescopes for diffraction limited optical imaging by a number of speckle interferometric techniques. The Knox-Thompson algorithm is among the best understood of these techniques. The image amplitude and phase integrations required for its implementation can be accomplished directly in event-coordinate space (in the extreme photon-limited case) more efficiently than in the more conventional Fourier transform space. We describe hardware to accomplish the integrations required for Knox-Thompson image reconstruction in real-time at the telescope, thus alleviating the principal data processing bottleneck in the present applications of diffraction limited astronomical imaging. Parallel digital recording of the photon coordinate lists permits subsequent off-line re-analysis of the data by other methods if desired. The basic system consists of hardware to localize discrete photoelectron responses in a CCD TV raster and for accumulation of the complex autocorrelogram. A generalization of the system can integrate triple correlations.
© (1986) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
E. Keith Hege and Peter R. Vokac "Real-Time Amplitude And Phase Integration For Diffraction Limited Imaging Discrete Photon Case", Proc. SPIE 0627, Instrumentation in Astronomy VI, (13 October 1986); https://doi.org/10.1117/12.968159
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