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| Phase Diversity Imaging: Real Time Correction of the Atmosphere and Telescope |
| Dr. Robert A. Gonsalves |
| Thursday, Nov 8, 2007 at 8:00 PM |
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Join us this month for what promises to be an engaging talk by Dr. Robert A. Gonsalves, “Phase Diversity Imaging: Real Time Correction of the Atmosphere and Telescope.” Phase diversity imaging uses multiple images of an object to combat the deleterious effect of the changes in the atmosphere and telescope. The method uses a model of the imaging system to form a joint estimate of the object and aberrations. It can be used to control an adaptive optic, if one is installed. This method can be used for small objects, as well as for large objects like the sun, the moon, planets, satellites, and galaxies. Dr. Gonsalves will show the mathematical bases for Phase Diversity Imaging, phase retrieval and image deconvolution. He will also show how the method was used to estimate the optical flaw in the Hubble Space Telescope. Finally, Dr. Gonsalves will show how, in principle, phase diversity imaging could apply to any telescope or video camera which has an adaptive optic (possibly, as simple as automatic focus) and some real-time processing capability.
Dr. Gonsalves is an Emeritus Professor in the Department of Electrical and Computer Engineering at Tufts University. He received the B. S. in Electrical Engineering at Tufts and the M. S. and Ph. D. from Northeastern University. At Tufts he taught, did research, and was the department chair. In 2000 he won the university's Leibner Award for Excellence in Education and Advising.
His area of expertise is digital image processing, with applications in the graphic arts, medicine, astronomy, and historical images. In 1990 he used phase diversity to help NASA determine the optical flaw in the Hubble Space Telescope; and he is currently helping NASA design the optics for Hubble's replacement. He analyzed home movies for public broadcasting productions on the assassination of John F. Kennedy and on the Loch Ness Monster. He has extensive experience in industry and is the founder and former President of Lexitek, Inc., which builds instruments for innovative research in optics. He is also working with the Harvard-Smithsonian Center for Astrophysics to image planets of nearby stars.
A part-time house builder, he designed and built a contemporary solar home and two neo-colonial homes. He and his wife, Patricia, live in Woburn, MA in an 1840 colonial he rehabilitated in 2004. They have five children and seven grandchildren.
For more details on Dr. Gonsalves, see http://www.eecs.tufts.edu/~bobg/.
Please join us for a pre-meeting dinner discussion at Changsho, 1712 Mass Ave, Cambridge, MA at 6:00pm before the meeting. |
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