Dr. Chungte William Chen Profile

Dr. Chungte William Chen

Senior Engineering Fellow at Raytheon

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Publications (8)

Proceedings Article | 2 August 2014 Paper

A deployable, annular, 30m telescope, space-based observatory

Justin Rey, Allan Wirth, Andrew Jankevics, Franklin Landers, David Rohweller, C. Bill Chen, Allen Bronowicki

Proceedings Volume 9143, 914318 (2014) https://doi.org/10.1117/12.2057182

KEYWORDS: Mirrors, Image segmentation, Telescopes, Space telescopes, Silicon carbide, James Webb Space Telescope, Polishing, Signal to noise ratio, Observatories, Manufacturing

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High resolution imaging from space requires very large apertures, such as NASA’s current mission the James Webb Space Telescope (JWST) which uses a deployable 6.5m segmented primary. Future missions requiring even larger apertures (>>10m) will present a great challenge relative to the size, weight and power constraints of launch vehicles as well as the cost and schedule required to fabricate the full aperture. Alternatively, a highly obscured annular primary can be considered. For example, a 93.3% obscured 30m aperture having the same total mirror area (91m²) as a 10.7m unobscured telescope, can achieve ~3X higher limiting resolution performance. Substantial cost and schedule savings can be realized with this approach compared to fully filled apertures of equivalent resolution. A conceptual design for a ring-shaped 30m telescope is presented and the engineering challenges of its various subsystems analyzed. The optical design consists of a 20X annular Mersenne form beam compactor feeding a classical 1.5m TMA telescope. Ray trace analysis indicates the design can achieve near diffraction limited images over a 200μrad FOV. The primary mirror consists of 70 identical rectangular 1.34x1.0m segments with a prescription well within the demonstrated capabilities of the replicated nanolaminate on SiC substrate technology developed by AOA Xinetics. A concept is presented for the deployable structure that supports the primary mirror segments. A wavefront control architecture consisting of an optical metrology subsystem for coarse alignment and an image based fine alignment and phasing subsystem is presented. The metrology subsystem is image based, using the background starfields for distortion and pointing calibration and fiducials on the segments for measurement. The fine wavefront control employs a hill climbing algorithm operating on images from the science camera. The final key technology required is the image restoration algorithm that will compensate for the highly obscured aperture. The results of numerical simulations of this algorithm will be presented and the signal-tonoise requirements for its successful application discussed. It is shown that the fabrication of the 30m telescope and all its supporting subsystems are within the scope of currently demonstrated technologies. It is also shown that the observatory can be brought to geosynchronous orbit, in its entirety, with a standard launch vehicle.

Proceedings Article | 26 September 2007 Paper

Beam steering and pointing with counter-rotating grisms

Chungte Bill Chen

Proceedings Volume 6714, 671409 (2007) https://doi.org/10.1117/12.738461

KEYWORDS: Prisms, Beam steering, Sensors, Mid-IR, Chromatic aberrations, Diffraction, Diffraction gratings, Diffractive optical elements, Beam controllers, Optical components

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Proceedings Article | 21 July 2006 Paper

Infrared Fabry-Perot spectrometer optical design: optimization and simulation

Chungte Bill Chen, Stephen Fry

Proceedings Volume 6342, 63422U (2006) https://doi.org/10.1117/12.692222

KEYWORDS: Fabry–Perot interferometers, Spectral resolution, Reflectivity, Absorption, Spectroscopy, Optical design, Systems modeling, Staring arrays, Infrared spectroscopy, Signal to noise ratio

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Proceedings Article | 10 October 2003 Paper

Advances in uncooled systems applications

John Anderson, Daryl Bradley, Chungte Chen, Richard Chin, H. Gonzalez, Ronald Hegg, K. Kostrzewa, C. Le Pere, S. Ton, Adam Kennedy, Daniel Murphy, Michael Ray, Richard Wyles, James Miller, Gwendolyn Newsome

Proceedings Volume 5074, (2003) https://doi.org/10.1117/12.487646

KEYWORDS: Sensors, Staring arrays, Thermography, Infrared sensors, Cameras, Infrared imaging, Microbolometers, Readout integrated circuits, Surveillance, Unmanned aerial vehicles

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Proceedings Article | 29 July 2002 Paper

Low-cost microsensors program

John Anderson, Daryl Bradley, Chungte Chen, Richard Chin, Ronald Hegg, Adam Kennedy, Daniel Murphy, Michael Ray, Richard Wyles, James Brown, Gwendolyn Newsome

Proceedings Volume 4719, (2002) https://doi.org/10.1117/12.477439

KEYWORDS: Sensors, Staring arrays, Infrared sensors, Microsensors, Thermography, Microbolometers, Readout integrated circuits, Infrared imaging, Surveillance, Cameras

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Proceedings Article | 10 October 2001 Paper

Low-cost microsensors program

John Anderson, Daryl Bradley, Chungte Chen, Richard Chin, K. Jurgelewicz, William Radford, Adam Kennedy, Daniel Murphy, Michael Ray, Richard Wyles, James Brown, Gwendolyn Newsome

Proceedings Volume 4369, (2001) https://doi.org/10.1117/12.445315

KEYWORDS: Sensors, Staring arrays, Microsensors, Infrared sensors, Readout integrated circuits, Surveillance, Microbolometers, Thermography, Cameras, Packaging

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Proceedings Article | 1 July 1992 Paper

Applications of diffractive optical elements in visible and infrared optical systems

C. William Chen

Proceedings Volume 10263, 102630A (1992) https://doi.org/10.1117/12.131973

KEYWORDS: Diffractive optical elements, Visible radiation, Infrared imaging, Infrared radiation, Chromatic aberrations, Optical components, Optical design, Image quality, Long wavelength infrared, Tolerancing

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Proceedings Article | 29 January 1992 Paper

The use of diffractive optical element in 3-5 micrometer optical system

C. Chen

Proceedings Volume 2075, 207502 (1992) https://doi.org/10.1117/12.2300230

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Showing 5 of 8 publications

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