Teaching Assistant
136 Tate, 624-7865, email sadj0001 @ umn.edu
http://www.sadjadi.org
Research Areas
Gravitational lensing, cosmology, polarimetry, evolutionary computation
Current Research
Starting in the Fall of 2007, I began work with Prof. Williams on cosmology related research. As the research developed, it focused more specifically on gravitational lensing in the infall regions surrounding clusters (or any large, generic gravitating system). Current work involves developing a computer simulation to model multi-plane gravitational lensing. The simulation works by shooting millions of rays of light through a distribution of mass that bend and deflect their trajectories. The pattern of the rays at the source plane, and the mapping of small regions of those sources back to the original image plane, may yield new understandings of the effects of substructure on observations.
During the Spring and Summer of 2007, I did some work on passive polarimetric infrared sensing. We were able to extract both the index of refraction and the surface normal vectors of a target both in simulations and in physical experiments. The result of the work was published as a chapter in a recent book.
Cerenkov Radiation
Since early 2004 I have been engaged in research towards a low energy, tunable source of centimeter wave, coherent Cerenkov radiation for use in physical and electrical research applications. Using a 3 KeV electron gun and a piece of titanium dioxide, a small quantity of microwave radiation was generated. Current work is focused on showing that this signal was indeed Cerenkov radiation and not some aberration of the experimental setup. The theoretical underpinnings of the experiment are also being investigated.
Other Research
Since mid-2003 I have been working on a broadly capable genetic algorithm and graphical user interface, written in both Matlab and Objective-C. Current research includes the effects of population size on optimization speeds and the potential for self-optimizing algorithm routines. Starting in early 2005 I began to investigate MTI-type radar for use in target tracking. This led me to begin to formulate a comprehensive data model that will, once completed, be able to generate highly realistic MTI radar datafor use in the development and testing of new tracking algorithms.
Selected Publications
F. Sadjadi and F. Sadjadi, Extraction of surface normal and index of refraction using a pair of passive infrared polarimetric sensors, IEEE CVPR 2007, 4th IEEE International Workshop on Object Tracking and Classification Beyond the Visible Spectrum (OTCBVS 2007) [abstract] [download infrared.pdf]
F. Sadjadi, Comparison of Fitness Scaling Functions in Genetic Algorithms with Applications to Optical Processing, Proc. SPIE Vol. 5557, p. 356-364, Optical Information Systems II (2004); Bahram Javidi, Demetri Psaltis; Eds. [abstract] [download genetic.pdf]
F. Sadjadi, Determining the Work Function of Tungsten Through Thermionic Emission Measurements, Proceedings of the 127th AAPT National Meeting (Summer 2003) [abstract] [download thermionic.pdf]
F. Sadjadi, A Philosophical Discussion of the Physical Limits of Radar, Geoscience and Remote Sensing Symposium, 2003. IGARSS '03. Proceedings. 2003 IEEE International, Vol. 6, Iss., 21-25 July 2003 pgs 3857-3859 vol. 6 [abstract] [download radar.pdf]
Education
B.S. Physics, University of Minnesota, 2005