| Born: 1944, USA |
Academic Qualifications:Ph.D 1972, Univ. of Pennsylvania
Prof. 1987. FELLOW of SPIE since 2000.
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Academic Positions:
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Research Interests:
Imaging through the atmosphere and restoration from such
blur. Atmospheric optics - optical turbulence and aerosol effects. Imaging in the presence of image vibrations and
motions and restorations from such blur. Terahertz frequency imaging. Imaging system
theory. Target acquisition.
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Research Projects:
We have studied extensively in the past imaging horizontally through the atmosphere. We now also research atmospheric effects in the vertical direction. To this end, a LIDAR (light radar) lab is used to study optical turbulence and aerosol size distributions and their profiles all the way up into the stratosphere. The project is funded by the Israel Science foundation. Basic questions considered are scintillations, angle of arrival fluctuations, image dancing and blur, widening of laser beams caused by stratospheric turbulence and aerosols, prediction of such effects, and comparison to models. Generalized turbulence models are developed to include non-kolomogorov turbulence. Applications to imaging, wireless optical communication, effects of laser beams on human visual systems, etc. are studied extensively.
Imaging at terahertz frequencies can permit imaging of concealed objects and hostages and is of great interest in homeland security. The key to decreasing the price of such systems is decreasing the price of sensitive detectors so that focal plane arrays can be developed inexpensively. This is the thrust of our research in this field, supported by the US ONR and NVESD.
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Abstracts of Current Research:- Image restoration: (a) based on predicted or measured atmospheric MTF, methods including an atmospheric Wiener filter have been developed to restore image quality so as to remove almost all atmospheric blur. This pertains to visible, near infrared, and thermal imaging. (b)Based on numerical calculation of optical transfer function in real time for any type of motion and vibration, methods for deblurring images with even very large blur caused by image motion and vibration have been developed. The restored images are essentially completely free of any such blur.
- atmospheric optics: System engineering approach including turbulence, aerosols, and absorption. Generalized turbulence approach includes non-Kolmogorov turbulence as function of elevation, which is important for elevations above 2-3 km. A model is being developed with which to forecast image quality permitted by the atmosphere as functions of air temperature, relative humidity, windspeed, and time of day, with wavelength and spatial frequency as parameters. The model is for visible, near infrared, and thermal infrared wavelengths.This is also a basic study as to how turbulence and aerosol properties are affected by weather. It is to be used in image processing to remove atmospherically-derived blur.
- millimeter wave/terahertz imaging: R&D of use of very inexpensive [50 cents] miniature neon indicator lamps as detectors or mixers in focal plane arrays for fast and very sensitive 3-D imaging.
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Publications:- Kopeika, N.S.. A System Engineering Approach to Imaging. SPIE Optical Engineering Press (www.spie.org): 700 pp (1998)
- Hadar, O., Adar, S., Cotter, A. & Kopeika, N.S.. Restoration of images degraded by extreme mechanical vibrations. Optics and Laser Technology 29: 171-177 (1997)
- Arnon, S. & Kopeika, N.S.. Free space optical communication satellite networks - vibrations effects Proc. IEEE. 85: 1646-1661 (1997)
- Yitzhaki, Y., Dror, I. & Kopeika, N.S.. Restoration of atmospherically-blurred images according to weather-predicted atmospheric modulation transfer function. Opt. Eng. 36: 3064-3072 (1997)
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Books:- Kopeika, N. , A System Engineering Approach to Imaging, SPIE Press, 1998 (700 pages).
(2nd printing. April 2000)
, SPIE Press, 1998
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| Keywords:Imaging, Atmospheric Optics, MMW/THz imaging, aerosols, turbulence. |
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Phones:
- Phone: 972-8-6461543
- Phone: 972-8-6235052
- Phone: 972-8-6235052
- Fax: 972-8-6472949
- Mobile: 972-54-2341944
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