Dr Goutam Chattopadhyay
Dr. Goutam Chattopadhyay is a Senior Member of the Engineering Staff at the Jet Propulsion Laboratory, California Institute of Technology, and a Visiting Faculty at the Division of Physics, Mathematics, and Astronomy at the California Institute of Technology, Pasadena, USA. He received the B.E. degree in electronics and telecommunication engineering from the Bengal Engineering College, Calcutta University, Calcutta, India, in 1987, the M.S. degree in electrical engineering from the University of Virginia, Charlottesville, in 1994, and the Ph.D. degree in electrical engineering from the California Institute of Technology (Caltech), Pasadena, in 1999. From 1987 until 1992, he was a Design Engineer with the Tata Institute of Fundamental Research (TIFR), Pune, India.
His research interests include microwave, millimeter-, and submillimeter- wave heterodyne and direct detector receivers, frequency sources and mixers in the terahertz region, antennas, SIS mixer technology, direct detector bolometer instruments, and high frequency radars. He has more than 100 publications in international journals and conferences and holds several patents. He is a Senior Member of the IEEE, member of the editorial board of the IEEE Transactions on Microwave Theory and Techniques, and a life member of Eta Kappa Nu – an electrical engineering honor society. Among various awards and honors, he was the recipient of the Best Undergraduate Gold Medal from the University of Calcutta in 1987, the Jawaharlal Nehru Fellowship Award from the Government of India in 1992, the IEEE MTT-S Graduate Fellowship Award in 1997, the Award of Excellence from the Jet Propulsion Laboratory in 2001, 2003, 2005, and 2006. He also received several NASA technical achievements awards and new technology invention awards.
Sensor Technology at Submillimeter Wavelengths for Space Applications
ICST 2007 Keynote Address - Abstract
Our universe is most luminous at far-infrared and submillimeter wavelengths (100 GHz – 10 THz) after the Cosmic Microwave Background (CMB) radiation. This region of the electromagnetic spectrum provides critical tracers for the study of a wide range of astrophysical and planetary phenomena. This spectral range contains information on the origin of the planets, stars, galaxies, and clusters; the geometry and matter/energy content of the Universe, atmospheric constituents and dynamics of the planets and comets and tracers for global monitoring and the ultimate health of the Earth.
Sensors at far-infrared and submillimeter wavelengths provide unprecedented sensitivity for astrophysical, planetary, and earth observing instruments. Very often, for a space-based platform where the instruments are not limited by atmospheric losses and absorption, the overall instrument sensitivity is dictated by the sensitivity of the sensors themselves. Moreover, some of the cryogenic sensors at submillimeter wavelengths provide almost quantum-limited sensitivity.
In this talk, an overview of the submillimeter-wave sensors and their performance and capabilities for space applications will be provided. The challenges of the future generation sensors at these wavelengths in addressing the needs for critical astrophysical, planetary, and earth observing missions will also be discussed.
The research described herein was carried out at the Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California, USA, under contract with National Aeronautics and Space Administration.
Professor Sotoshi Yamada
Sotoshi YAMADA was born in Kanazawa, Japan on November 22, 1949. He received the B.E. degree and the M.E. degree from the Department of Electrical Engineering, Kanazawa University, Kanazawa, Japan, in 1972 and 1974 respectively. He received the Dr.Eng. degree from Kyushu University, Fukuoka, Japan, in 1985.
From 1974 to 1992, he has been with the Department of Electrical and Computer Engineering, Faculty of Engineering, Kanazawa University. He is professor at Laboratory of Magnetic Field Control and Applications from 1992 to 2001, and at Institute of Nature and Environmental Engineering, Kanazawa University from 2002 to now. He has been engaged in research on nondestructive testing by giant magnetoresistance sensor, power magnetic devices, numerical electromagnetic field calculation, biomagnetics, and etc.
High-Spatial-Resolution Magnetic-Field Measurement by Giant Magnetoresistance Sensor - Applications to Nondestructive Evaluation and Biomedical Engineering
ICST 2007 Keynote Address - Abstract
In the past few years, giant magnetoresistance (GMR) sensor has been developed and widely applied to use as magnetic read head in data storage industry. Due to the GMR sensor’s benefit, it was not obstructed to use in only the application. This paper describes the new applications of high-spatial-resolution magnetic-field measurement to nondestructive evaluation and biomedical engineering. For nondestructive evaluation, the GMR sensor, used as magnetic sensor based on eddy-current testing technique, was applied to detection of micro-crack on micro-conductor for the purpose of printed circuit board inspection and detection of micro-solder-ball grid array. For biomedical engineering, magnetic fluid weight density which has permeability slightly greater than one was measured by the GMR sensor based on magnetic path prediction. In addition, the GMR sensor was applied to measure micro-current and these can lead to direct detection of nervous action.