Mr. Thomas P. Bergin Profile

Thomas P. Bergin

at SYColeman Corp

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Author

Publications (14)

Proceedings Article | 4 August 2004 Paper

Using programmable graphics to improve zoom window anti-aliasing

Eric Olson, Thomas Bergin

Proceedings Volume 5408, (2004) https://doi.org/10.1117/12.549216

KEYWORDS: Zoom lenses, Visualization, Computer programming, OpenGL, Image processing, Computer graphics, Algorithm development, RGB color model, Roads, Standards development

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Proceedings Article | 4 August 2004 Paper

Advances in cryo-vacuum test capabilities for dual-band sensors at the kinetic kill vehicle hardware-in-the-loop simulation (KHILS) facility

Rhoe Thompson, W. Larry Herald, Thomas Bergin, Steven Marlow, Eric Glattke

Proceedings Volume 5408, (2004) https://doi.org/10.1117/12.548989

KEYWORDS: Projection systems, Sensors, Calibration, Real-time computing, Visualization, Field programmable gate arrays, Image processing, Video, Electronics, Computing systems

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Proceedings Article | 12 September 2003 Paper

Impact of distortion removal techniques on band-to-band ratio measurement

Wayne Keen, Brian Smith, David Flynn, Thomas Bergin, Nicholas Rummelt, Rhoe Thompson

Proceedings Volume 5092, (2003) https://doi.org/10.1117/12.488496

KEYWORDS: Distortion, Cameras, Projection systems, Sensors, Error analysis, Infrared radiation, Image processing, Mid-IR, Temperature metrology, Optical alignment

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Proceedings Article | 12 September 2003 Paper

Application of innovative rendering techniques for the hardware-in-the-loop (HIL) scene generation

Thomas Bergin

Proceedings Volume 5092, (2003) https://doi.org/10.1117/12.488588

KEYWORDS: Visualization, Video, Distortion, Light sources and illumination, RGB color model, Computer programming, Video acceleration, Image processing, 3D image processing, Computer simulations

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Proceedings Article | 12 July 2002 Paper

Correction of spatial distortions in a two-color infrared projection system

Wayne Keen, David Flynn, Thomas Bergin, Breck Sieglinger, Rhoe Thompson

Proceedings Volume 4717, (2002) https://doi.org/10.1117/12.474717

KEYWORDS: Infrared radiation, Projection systems, Cameras, Infrared imaging, Chemical elements, Infrared cameras, Electroluminescence, Visualization, Signal to noise ratio, Optical components

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Proceedings Article | 31 August 2001 Paper

Characterization of the WISP array performance in ambient and cryogenic operating environments

James Kircher, Eric Olson, Thomas Bergin, David Flynn

Proceedings Volume 4366, (2001) https://doi.org/10.1117/12.438067

KEYWORDS: Cameras, Resistors, Nonuniformity corrections, Cryogenics, Projection systems, Temperature metrology, Field effect transistors, Mid-IR, Calibration, Radiometric resolution

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Proceedings Article | 31 August 2001 Paper

Nonuniformity correction using a flood technique and 1:1 mapping

Eric Olson, Thomas Bergin

Proceedings Volume 4366, (2001) https://doi.org/10.1117/12.438099

KEYWORDS: Nonuniformity corrections, Resistors, Sensors, Floods, Black bodies, Projection systems, Point spread functions, Frame grabbers, Calibration, Medium wave

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Proceedings Article | 12 July 2000 Paper

Innovations in IR projector arrays

Barry Cole, B. Higashi, Jeff Ridley, J. Holmen, K. Newstrom, C. Zins, K. Nguyen, Steven Weeres, Burgess Johnson, Robert Stockbridge, Robert Lee Murrer, Eric Olson, Thomas Bergin, James Kircher, David Flynn

Proceedings Volume 4027, (2000) https://doi.org/10.1117/12.391704

KEYWORDS: Raster graphics, Cameras, Semiconducting wafers, Projection systems, Mid-IR, Electronics, Capacitors, Annealing, Field effect transistors, Infrared cameras

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Proceedings Article | 12 July 2000 Paper

Radiometric stability of Phase 3 WISP arrays

David Flynn, Steven Marlow, Thomas Bergin, Robert Lee Murrer

Proceedings Volume 4027, (2000) https://doi.org/10.1117/12.391693

KEYWORDS: Annealing, Cameras, Projection systems, Temperature metrology, Calibration, Black bodies, Transmittance, Sensors, Mid-IR, Infrared radiation

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Phase 3 WISP arrays and BRITE arrays are currently being used extensively in many projection systems in many different facilities. These arrays have not been annealed at the factory, and previous tests with the arrays have revealed instabilities in the radiometric output when the arrays are driven at higher voltages. In some applications, the instabilities can be avoided by operating the arrays at lower voltages. In many KHILS applications, it is desirable to drive the arrays with the highest possible voltages to simulate hot missile targets. In one KHILS application (the KHILS VAcuum Cold Chamber, KVACC), the arrays are cooled to near cryogenic temperatures and then driven to high voltages. At lower substrate temperatures, the characteristic responses of the emitters change. Thus, it is important that the response and the stability of the radiometric output of the arrays be well understood for various substrate temperatures, and that the arrays either be annealed or operated below the voltage where the emitters begin to anneal. KHILS has investigated annealing procedures in the past, but there was concern that the annealing procedures themselves -- driving the arrays at high voltages for long times -- would damage the arrays. In order to understand the performance of the arrays better, and to reduce risks associated with driving the arrays at high voltages and operating the arrays at low substrate temperatures, a systematic measurement program was initiated. The radiometric output of new Phase 3 WISP arrays was accurately measured as a function of voltage and time. Arrays designated for testing were driven to the higher voltages and the radiometric output was measured for as long as two hours. Curves indicative of the annealing were observed, and it was determined that the maximum stable output without annealing was about 500 K (MWIR apparent temperature). Blocks of emitters were annealed and tested again. It was determined that stable output of as much as 680 K could be obtained with annealed emitters. KHILS personnel worked with Honeywell Technology Center (HTC) to establish annealing procedures that could be done by HTC in the future. Conclusions to date are that once the emitters are sufficiently annealed, their output does not change further with time, except for some small transient effects that will be discussed in the paper.

Proceedings Article | 19 July 1999 Paper

Ladar scene generation techniques for hardware-in-the-loop testing

Jason Coker, Charles Coker, Thomas Bergin

Proceedings Volume 3697, (1999) https://doi.org/10.1117/12.352894

KEYWORDS: Sensors, LIDAR, Computer simulations, Detection and tracking algorithms, Signal detection, Signal attenuation, Light sources, Hardware in the loop testing, Imaging systems, Composites

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Proceedings Article | 19 July 1999 Paper

Radiometric calibration procedures for a wideband infrared scene projector (WISP)

David Flynn, Steven Marlow, Thomas Bergin, James Kircher

Proceedings Volume 3697, (1999) https://doi.org/10.1117/12.352906

KEYWORDS: Cameras, Projection systems, Calibration, Black bodies, Quantum well infrared photodetectors, Long wavelength infrared, Infrared radiation, Mid-IR, Temperature metrology, Imaging systems

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Proceedings Article | 19 July 1999 Paper

Measurement of the wideband infrared scene projector (WISP) radiometric and thermal resolution

James Kircher, Steven Marlow, Thomas Bergin, W. Larry Herald

Proceedings Volume 3697, (1999) https://doi.org/10.1117/12.352905

KEYWORDS: Cameras, Nonuniformity corrections, Electronics, Sensors, Black bodies, Radiometric resolution, Calibration, Projection systems, Temperature metrology, Spatial resolution

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Proceedings Article | 13 July 1998 Paper

Demonstration of KHILS two-color IR projection capability

Lawrence Jones, Jason Coker, Dennis Garbo, Eric Olson, Robert Lee Murrer, Thomas Bergin, George Goldsmith, Dennis Crow, Andrew Guertin, Michael Dougherty, Thomas Marler, Virgil Timms

Proceedings Volume 3368, (1998) https://doi.org/10.1117/12.316367

KEYWORDS: Cameras, Resistors, Calibration, Black bodies, Long wavelength infrared, Optical filters, Reflectivity, Mid-IR, Staring arrays, Projection systems

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For more than a decade, there has been considerable discussion about using different IR bands for the detection of low contrast military targets. Theory predicts that a target can have little to no contrast against the background in one IR band while having a discernible signature in another IR band. A significant amount of effort has been invested towards establishing hardware that is capable of simultaneously imaging in two IR bands to take advantage of this phenomenon. Focal plane arrays (FPA) are starting to materialize with this simultaneous two-color imaging capability. The Kinetic Kill Vehicle Hardware-in-the-loop Simulator (KHILS) team of the Air Force Research Laboratory and the Guided Weapons Evaluation Facility (GWEF), both at Eglin AFB, FL, have spent the last 10 years developing the ability to project dynamic IR scenes to imaging IR seekers. Through the Wideband Infrared Scene Projector (WISP) program, the capability to project two simultaneous IR scenes to a dual color seeker has been established at KHILS. WISP utilizes resistor arrays to produce the IR energy. Resistor arrays are not ideal blackbodies. The projection of two IR colors with resistor arrays, therefore, requires two optically coupled arrays. This paper documents the first demonstration of two-color simultaneous projection at KHILS. Agema cameras were used for the measurements. The Agema's HgCdTe detector has responsivity from 4 to 14 microns. A blackbody and two IR filters (MWIR equals 4.2 t 7.4 microns, LWIR equals 7.7 to 13 microns) were used to calibrate the Agema in two bands. Each filter was placed in front of the blackbody one at a time, and the temperature of the blackbody was stepped up in incremental amounts. The output counts from the Agema were recorded at each temperature. This calibration process established the radiance to Agema output count curves for the two bands. The WISP optical system utilizes a dichroic beam combiner to optically couple the two resistor arrays. The transmission path of the beam combiner provided the LWIR (6.75 to 12 microns), while the reflective path produced the MWIR (3 to 6.5 microns). Each resistor array was individually projected into the Agema through the beam combiner at incremental output levels. Once again the Agema's output counts were recorded at each resistor array output level. These projections established the resistor array output to Agema count curves for the MWIR and LWIR resistor arrays. Using the radiance to Agema counts curves, the MWIR and LWIR resistor array output to radiance curves were established. With the calibration curves established, a two-color movie was projected and compared to the generated movie radiance values. By taking care to correctly account for the spectral qualities of the Agema camera, the calibration filters, and the diachroic beam combiner, the projections matched the theoretical calculations. In the near future, a Lockheed- Martin Multiple Quantum Well camera with true two-color IR capability will be tested.

Proceedings Article | 15 July 1997 Paper

Optical signal injector system for HWIL testing of ladar seekers

Michael Cornell, Charles Naumann, Thomas Bergin

Proceedings Volume 3084, (1997) https://doi.org/10.1117/12.280968

KEYWORDS: LIDAR, Channel projecting optics, Electronics, Signal processing, Modulators, Signal generators, Projection systems, Receivers, Optical modulators, Optical simulations

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