MIOMD-XI Speakers    
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1.  Dr. Sarath Gunapala, Jet Propulsion Lab, USA
Late-Breaking Results: Modulation Transfer Function of Infrared Focal Plane Arrays
Speaker Biography: Sarath Gunapala received his PhD in physics from the University of Pittsburgh in 1986. Since then he studied infrared properties of III-V compound semiconductor hetero-structures and the development of quantum well infrared photodetectors (QWIPs) for infrared imaging at AT&T Bell Laboratories. In 1992, Dr. Gunapala joined NASA's Jet Propulsion Laboratory at the California Institute of Technology where he is a senior research scientist, a principal member of the engineering staff, and the director of the Center for Infrared Sensors. Dr. Gunapala has authored over 250 publications, including eleven book chapters, and holds twenty two U.S. patents. He has received the NASA Exceptional Engineering Achievement Medal and is a fellow of the SPIE society.

Summary: Modulation transfer function (MTF) is the ability of an imaging system to faithfully image a given object. The MTF of an imaging system quantifies the ability of the system to resolve or transfer spatial frequencies. Consider a bar pattern with a cross-section of each bar being a sine wave. Since the image of a sine wave light distribution is always a sine wave, the image is always a sine wave independent of the other effects in the imaging system such as aberration. Usually, imaging systems have no difficulty in reproducing the bar pattern when the bar pattern is closely spaced. However, an imaging system reaches its limit when the features of the bar pattern get closer and closer together.
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