Dr. Nachappa Gopalsami Profile

Dr. Nachappa Gopalsami

Retired

SPIE Involvement:

Author

Publications (11)

Proceedings Article | 5 June 2014 Paper

Tactile MEMS-based sensor for delicate microsurgery

Young Soo Park, Wooho Lee, Nachappa Gopalsami, Mohan Gundeti

Proceedings Volume 9116, 911603 (2014) https://doi.org/10.1117/12.2058250

KEYWORDS: Sensors, Tissues, Surgery, Haptic technology, Robotic surgery, Microelectromechanical systems, Spatial resolution, Photoresist materials, Resistors, Resistance

Read Abstract +

SPIE Journal Paper | 14 September 2012 Open Access

Passive millimeter-wave imaging with compressive sensing

Nachappa Gopalsami, Shaolin Liao, Thomas Elmer, Eugene Koehl, Alexander Heifetz, Apostolos Paul Raptis, Leonidas Spinoulas, Aggelos Katsaggelos

OE, Vol. 51, Issue 9, 091614, (September 2012) https://doi.org/10.1117/12.10.1117/1.OE.51.9.091614

KEYWORDS: Imaging systems, Compressed sensing, Extremely high frequency, Passive millimeter wave imaging, Image restoration, Signal to noise ratio, Raster graphics, Radiometry, Metals, Photomasks

Read Abstract +

DOWNLOAD PAPER

Proceedings Article | 9 May 2012 Paper

Evaluation of passive millimeter wave system performance in adverse weather conditions

N. Gopalsami, S. Liao, T. Elmer, E. Koehl, A. Raptis

Proceedings Volume 8362, 83620I (2012) https://doi.org/10.1117/12.919212

KEYWORDS: Passive millimeter wave sensors, Polarization, Extremely high frequency, Imaging systems, Clouds, Radiometry, Image quality, Passive millimeter wave imaging, Target detection, Fiber optic gyroscopes

Read Abstract +

Proceedings Article | 26 May 2011 Paper

Compressive sampling in passive millimeter-wave imaging

N. Gopalsami, T. Elmer, S. Liao, R. Ahern, A. Heifetz, A. Raptis, M. Luessi, D. Babacan, A. Katsaggelos

Proceedings Volume 8022, 80220I (2011) https://doi.org/10.1117/12.886998

KEYWORDS: Image restoration, Photomasks, Signal to noise ratio, Image acquisition, Radiometry, Passive millimeter wave imaging, Imaging systems, Lamps, Raster graphics, Compressed sensing

Read Abstract +

Proceedings Article | 24 April 2010 Paper

Passive millimeter wave imaging and spectroscopy system for terrestrial remote sensing

Nachappa Gopalsami, Shaolin Liao, Eugene Koehl, Thomas Elmer, Alexander Heifetz, Hual-Te Chien, Apostolos Raptis

Proceedings Volume 7670, 767003 (2010) https://doi.org/10.1117/12.850123

KEYWORDS: Imaging systems, Imaging spectroscopy, Spectroscopy, Extremely high frequency, Passive millimeter wave imaging, Remote sensing, Signal to noise ratio, Radiometry, Multichannel imaging systems, Nitrogen

Read Abstract +

Proceedings Article | 25 October 2006 Paper

Remote detection of chemicals with passive millimeter waves

N. Gopalsami, S. Bakhtiari, T. Elmer, A. Raptis

Proceedings Volume 6378, 63781A (2006) https://doi.org/10.1117/12.690212

KEYWORDS: Radiometry, Extremely high frequency, Absorption, Atmospheric modeling, Molecules, Atmospheric monitoring, Atmospheric sensing, Remote sensing, Gases, Microwave radiation

Read Abstract +

Proceedings Article | 14 July 1999 Paper

Millimeter-wave imaging of thermal and chemical signatures

Nachappa Gopalsami, Apostolos Raptis

Proceedings Volume 3703, (1999) https://doi.org/10.1117/12.352998

KEYWORDS: Radiometry, Clouds, Molecules, Antennas, Sensors, Atmospheric sensing, Liquids, Millimeter wave imaging, Imaging systems, Absorption

Read Abstract +

Proceedings Article | 13 November 1998 Paper

Remote detection of chemicals by millimeter-wave spectroscopy

Nachappa Gopalsami, Apostolos Raptis

Proceedings Volume 3465, (1998) https://doi.org/10.1117/12.331172

KEYWORDS: Data modeling, Sensors, Radar, Absorption, Spectroscopy, Signal detection, Reflectors, Power supplies, Oscillators, Transmitters

Read Abstract +

Proceedings Article | 18 December 1996 Paper

Open-path millimeter wave spectroscopy in the 225- to 315-GHz range

Nachappa Gopalsami, Sasan Bakhtiari, Apostolos Raptis

Proceedings Volume 2842, (1996) https://doi.org/10.1117/12.262757

KEYWORDS: Radar, Fabry–Perot interferometers, Spectroscopy, Reflectors, Oscillators, Calibration, Sensors, Power supplies, Absorption, Mirrors

Read Abstract +

Proceedings Article | 13 October 1995 Paper

Development of a millimeter-wave sensor for environmental monitoring

Nachappa Gopalsami, Sasan Bakhtiari, Apostolos Raptis

Proceedings Volume 2558, (1995) https://doi.org/10.1117/12.224235

KEYWORDS: Deconvolution, Sensors, Absorption, Chemical analysis, Molecules, Optical filters, Radar, Spectroscopy, Environmental monitoring, Gases

Read Abstract +

Proceedings Article | 14 September 1994 Paper

High-resolution millimeter-wave imaging system for defect characterization in dielectric slabs

Sasan Bakhtiari, Nachappa Gopalsami, Apostolos Raptis, Matthew Lepper

Proceedings Volume 2275, (1994) https://doi.org/10.1117/12.186730

KEYWORDS: Dielectrics, Antennas, Imaging systems, Composites, Reflection, Nondestructive evaluation, Millimeter wave imaging, Defect detection, Microwave radiation, Wave propagation

Read Abstract +

Showing 5 of 11 publications

View contact details

UPDATE YOUR PROFILE

Is this your profile? Update it now.

Sign into your SPIE.org account

Don’t have a profile and want one?

Create an account on SPIE.org

Keywords/Phrases

Search In:

Publication Years