Dr. Andre D. Cropper Profile

Dr. Andre D. Cropper

Technical Fellow at RTX Corp

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Publications (8)

Proceedings Article | 17 October 2019 Presentation + Paper

Target detection performance of hyperspectral imagers

A. D. Cropper, David Mann, Milton Smith

Proceedings Volume 11158, 1115802 (2019) https://doi.org/10.1117/12.2532406

KEYWORDS: Sensors, Target detection, Reflectivity, Detection and tracking algorithms, Sensor performance, Imaging systems, Fourier transforms, Hyperspectral imaging, Signal to noise ratio, Hyperspectral target detection

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Proceedings Article | 7 October 2019 Paper

A comparison of techniques to model and measure spatial resolution in hyperspectral imaging sensors

A. D. Cropper, David Mann

Proceedings Volume 11155, 1115526 (2019) https://doi.org/10.1117/12.2532405

KEYWORDS: Point spread functions, Sensors, Modulation transfer functions, Data modeling, Spatial resolution, Image sensors, Convolution, Diffraction, Hyperspectral imaging, Mirrors

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Proceedings Article | 18 May 2016 Paper

Atmospheric effects on long stand-off HSI applications

A. Cropper, David Mann

Proceedings Volume 9846, 98460G (2016) https://doi.org/10.1117/12.2228501

KEYWORDS: Systems modeling, Atmospheric modeling, Imaging systems, Performance modeling, Atmospheric optics, Signal to noise ratio, Systems modeling, Atmospheric modeling, Imaging systems, Atmospheric optics, Reflectivity, Sun, Sensors, Target detection

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Hyperspectral Imaging (HSI) is finding utility in many new areas, such as environmental and agricultural monitoring, medicine and food technology, industrial inspection, land management, and defense usage, due to its ability to simultaneously collect both spatial and spectral information. Within the tropical environment the utility of HSI has been demonstrated through various rain forest and coastal environmental programs.

System performance for all HSI systems is influenced by many factors, including environmental conditions, operational usage, internal system composition and the processing chain. Truly optimizing this performance requires an understanding of the operational conditions under which each system will perform. One of the key factors affecting system performance, especially at long stand-off ranges, is the atmospheric effects. This paper presents analytical results demonstrating the effects of atmospheric conditions on long stand-off airborne HSI systems based on a Raytheon developed performance model for estimating System performance.

This end-to-end System Performance Model is especially designed for long stand-off airborne detection with large off-nadir viewing angles. It takes into account most of the components within the entire imaging chain. The model divides the end-to-end imaging chain into three parts: the environmental component, the Concept of Operations (CONOPS), and the imaging system effects. The environmental component includes solar illumination, reflectance of materials on the ground, scattering, and atmospheric transmittance. The system component includes the effects of system noise and throughput. The CONOPS accounts for the various operating conditions best suited for long stand-off detection. The analytical results presented in this paper provide details on the influence of the atmospheric conditions, including tropical conditions, on NESR and SNR performance in a Spot Mode CONOPS for a HSI system based on the end-to-end System Performance Model. These results are based on continued work developed from the “Long stand-off Performance Modelling of HSI Airborne Imaging Systems”.

Proceedings Article | 17 May 2011 Paper

A MEMS-based spectral-polarimetric imaging and target tracking architecture for airborne broad-area search

J. Daniel Newman, Bernard Brower, Paul P. Lee, Andre Cropper, Mark Gibney, Matthew Pellechia

Proceedings Volume 8053, 805302 (2011) https://doi.org/10.1117/12.882829

KEYWORDS: Sensors, Imaging systems, Optical filters, Image filtering, Target detection, Microelectromechanical systems, Polarimetry, Prisms, Image sensors, Digital filtering

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Proceedings Article | 19 May 2006 Paper

MEMS programmable spectral imaging system for remote sensing

J. Daniel Newman, Marek Kowarz, James Phalen, Paul Lee, A. Cropper

Proceedings Volume 6220, 622006 (2006) https://doi.org/10.1117/12.668916

KEYWORDS: Imaging systems, Microelectromechanical systems, Optical filters, Mirrors, Modulators, Remote sensing, Sensors, Spectroscopy, Imaging spectroscopy, Multispectral imaging

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Proceedings Article | 27 February 2002 Paper

Optical characterization of OLED displays with touch screens

A. Cropper, Rodney Feldman, Michael Siwinski, Kathleen Kilmer

Proceedings Volume 4464, (2002) https://doi.org/10.1117/12.457494

KEYWORDS: Organic light emitting diodes, Circular polarizers, Flat panel displays, Optical properties, Interfaces, CRTs, Digital signal processing, OLED lighting, Glasses, Prototyping

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Proceedings Article | 2 February 2001 Paper

Organic LED system applications

A. Cropper, Ronald Cok, Rodney Feldman

Proceedings Volume 4105, (2001) https://doi.org/10.1117/12.416897

KEYWORDS: Organic light emitting diodes, LCDs, Flat panel displays, Display technology, Organic materials, Light emitting diodes, Manufacturing, Analog electronics, Cell phones, Video

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Proceedings Article | 14 July 1995 Paper

Electron-beam-induced current study of gallium nitride and diamond materials

A. Cropper, Daniel Moore, Craig Scott, Ronald Green

Proceedings Volume 2428, (1995) https://doi.org/10.1117/12.213748

KEYWORDS: Gallium nitride, Electron beams, Diamond, Diffusion, Electron holes, Electrodes, Scanning electron microscopy, Wide bandgap semiconductors, Semiconductor materials, Microelectronics

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Showing 5 of 8 publications

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