Mr. Luke J. Skelly Profile

Luke J. Skelly

Technical Staff at MIT Lincoln Laboratory

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Publications (5)

Proceedings Article | 14 May 2019 Presentation

Photon-counting ladar in support of disaster relief (Conference Presentation)

Alexandru Vasile, Luke Skelly, Brendan Edwards, Lin Stowe, M. Jalal Khan

Proceedings Volume 10978, 1097806 (2019) https://doi.org/10.1117/12.2520629

KEYWORDS: LIDAR, Avalanche photodetectors, Sensors, Statistical analysis, Imaging systems, Optical testing

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Proceedings Article | 8 May 2018 Paper

Measurement campaign for hyperspectral imaging in complex illumination environments

Steven Golowich, Ronald Lockwood, Marius Albota, John Jacobson, Richard Nadile, Stuart Biggar, Rajan Gurjar, Lin Stowe, Luke Skelly, Ian Fletcher, Ping Fung, Sarah Klein, Charles Gulley

Proceedings Volume 10644, 106441L (2018) https://doi.org/10.1117/12.2305200

KEYWORDS: Atmospheric modeling, Reflectivity, Scattering, Data modeling, LIDAR, Sensors, Sun, Hyperspectral imaging, Algorithm development, 3D modeling

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Proceedings Article | 10 October 2007 Paper

Improved feature descriptors for 3D surface matching

Luke Skelly, Stan Sclaroff

Proceedings Volume 6762, 67620A (2007) https://doi.org/10.1117/12.753263

KEYWORDS: Clouds, Image resolution, Sensors, 3D image processing, Object recognition, Mirrors, 3D metrology, Spherical lenses, Image processing, Image filtering

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Proceedings Article | 19 May 2005 Paper

High-resolution 3D imaging laser radar flight test experiments

J. Burnside, G. Rich, L. Skelly, Richard Marino, T. Square, M. O'Brien, G. Rowe, A. Vasile, R. Heinrichs, W. Davis, R. Hatch, J. McLaughlin, E. Lee, B. Stanley

Proceedings Volume 5791, (2005) https://doi.org/10.1117/12.609679

KEYWORDS: Sensors, LIDAR, 3D image processing, Stereoscopy, Camouflage, Staring arrays, Pulsed laser operation, Imaging systems, Avalanche photodetectors, 3D acquisition

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Situation awareness and accurate Target Identification (TID) are critical requirements for successful battle management. Ground vehicles can be detected, tracked, and in some cases imaged using airborne or space-borne microwave radar. Obscurants such as camouflage net and/or tree canopy foliage can degrade the performance of such radars. Foliage can be penetrated with long wavelength microwave radar, but generally at the expense of imaging resolution. The goals of the DARPA Jigsaw program include the development and demonstration of high-resolution 3-D imaging laser radar (ladar) ensor technology and systems that can be used from airborne platforms to image and identify military ground vehicles that may be hiding under camouflage or foliage such as tree canopy. With DARPA support, MIT Lincoln Laboratory has developed a rugged and compact 3-D imaging ladar system that has successfully demonstrated the feasibility and utility of this application. The sensor system has been integrated into a UH-1 helicopter for winter and summer flight campaigns. The sensor operates day or night and produces high-resolution 3-D spatial images using short laser pulses and a focal plane array of Geiger-mode avalanche photo-diode (APD) detectors with independent digital time-of-flight counting circuits at each pixel. The sensor technology includes Lincoln Laboratory developments of the microchip laser and novel focal plane arrays. The microchip laser is a passively Q-switched solid-state frequency-doubled Nd:YAG laser transmitting short laser pulses (300 ps FWHM) at 16 kilohertz pulse rate and at 532 nm wavelength. The single photon detection efficiency has been measured to be > 20 % using these 32x32 Silicon Geiger-mode APDs at room temperature. The APD saturates while providing a gain of typically > 106. The pulse out of the detector is used to stop a 500 MHz digital clock register integrated within the focal-plane array at each pixel. Using the detector in this binary response mode simplifies the signal processing by eliminating the need for analog-to-digital converters and non-linearity corrections. With appropriate optics, the 32x32 array of digital time values represents a 3-D spatial image frame of the scene. Successive image frames illuminated with the multi-kilohertz pulse repetition rate laser are accumulated into range histograms to provide 3-D volume and intensity information. In this article, we describe the Jigsaw program goals, our demonstration sensor system, the data collection campaigns, and show examples of 3-D imaging with foliage and camouflage penetration. Other applications for this 3-D imaging direct-detection ladar technology include robotic vision, avigation of autonomous vehicles, manufacturing quality control, industrial security, and topography.

Proceedings Article | 21 August 2003 Paper

A compact 3D imaging laser radar system using Geiger-mode APD arrays: system and measurements

James Mooney, Michael O'Brien, Gregory Rowe, Robert Hatch, Joseph McLaughlin, Luke Skelly, W. Davis, Richard Marino, Robert Knowlton, Stephen Forman, Timothy Stephens, Joseph Adams

Proceedings Volume 5086, (2003) https://doi.org/10.1117/12.501581

KEYWORDS: LIDAR, Imaging systems, Avalanche photodetectors, Stereoscopy, Sensors, Laser systems engineering, 3D image processing, Digital electronics, Optical design

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