Dr. Philip T. C. Chen Profile

Dr. Philip T. C. Chen

at NASA Goddard Space Flight Ctr

SPIE Involvement:

Author

Proceedings Article | 22 July 2016 Paper

The Neutron star Interior Composition Explorer (NICER): design and development

Keith Gendreau, Zaven Arzoumanian, Phillip Adkins, Cheryl Albert, John Anders, Andrew Aylward, Charles Baker, Erin Balsamo, William Bamford, Suyog Benegalrao, Daniel Berry, Shiraz Bhalwani, J. Kevin Black, Carl Blaurock, Ginger Bronke, Gary Brown, Jason Budinoff, Jeffrey Cantwell, Thoniel Cazeau, Philip Chen, Thomas Clement, Andrew Colangelo, Jerry Coleman, Jonathan Coopersmith, William Dehaven, John Doty, Mark Egan, Teruaki Enoto, Terry Fan, Deneen Ferro, Richard Foster, Nicholas Galassi, Luis Gallo, Chris Green, Dave Grosh, Kong Ha, Monther Hasouneh, Kristofer Heefner, Phyllis Hestnes, Lisa Hoge, Tawanda Jacobs, John Jørgensen, Michael Kaiser, James Kellogg, Steven Kenyon, Richard Koenecke, Robert Kozon, Beverly LaMarr, Mike Lambertson, Anne Larson, Steven Lentine, Jesse Lewis, Michael Lilly, Kuochia Alice Liu, Andrew Malonis, Sridhar Manthripragada, Craig Markwardt, Bryan Matonak, Isaac Mcginnis, Roger Miller, Alissa Mitchell, Jason Mitchell, Jelila Mohammed, Charles Monroe, Kristina Montt de Garcia, Peter Mulé, Louis Nagao, Son Ngo, Eric Norris, Dwight Norwood, Joseph Novotka, Takashi Okajima, Lawrence Olsen, Chimaobi Onyeachu, Henry Orosco, Jacqualine Peterson, Kristina Pevear, Karen Pham, Sue Pollard, John Pope, Daniel Powers, Charles Powers, Samuel Price, Gregory Prigozhin, Julian Ramirez, Winston Reid, Ronald Remillard, Eric Rogstad, Glenn Rosecrans, John Rowe, Jennifer Sager, Claude Sanders, Bruce Savadkin, Maxine Saylor, Alexander Schaeffer, Nancy Schweiss, Sean Semper, Peter Serlemitsos, Larry Shackelford, Yang Soong, Jonathan Struebel, Michael Vezie, Joel Villasenor, Luke Winternitz, George Wofford, Michael Wright, Mike Yang, Wayne Yu

Proceedings Volume 9905, 99051H (2016) https://doi.org/10.1117/12.2231304

KEYWORDS: Sensors, Calibration, Electronics, X-rays, X-rays, X-ray detectors, Signal detection, Silicon, Analog electronics, Microcontrollers, Aerospace engineering

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Proceedings Article | 29 July 2014 Paper

The neutron star interior composition explorer (NICER): mission definition

Z. Arzoumanian, K. Gendreau, C. Baker, T. Cazeau, P. Hestnes, J. Kellogg, S. Kenyon, R. Kozon, K.-C. Liu, S. Manthripragada, C. Markwardt, A. Mitchell, J. Mitchell, C. Monroe, T. Okajima, S. Pollard, D. Powers, B. Savadkin, L. Winternitz, P. T. Chen, M. Wright, R. Foster, G. Prigozhin, R. Remillard, J. Doty

Proceedings Volume 9144, 914420 (2014) https://doi.org/10.1117/12.2056811

KEYWORDS: Stars, X-rays, Sensors, Space operations, X-ray detectors, Electronics, Actuators, Sun, X-ray optics, Global Positioning System

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Proceedings Article | 7 September 2006 Paper

Contamination control of space-based laser instruments

Philip Chen, Randy Hedgeland, Larry Ramsey, Rachel Rivera, Karrie Houston

Proceedings Volume 6291, 629104 (2006) https://doi.org/10.1117/12.681175

KEYWORDS: Contamination, Contamination control, Laser applications, Laser induced damage, Space based lasers, LIDAR, Space operations, Pulsed laser operation, Laser development, Semiconductor lasers

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Proceedings Article | 7 July 2006 Paper

The Space Infrared Interferometric Telescope (SPIRIT): mission study results

David Leisawitz, Charles Baker, Amy Barger, Dominic Benford, Andrew Blain, Rob Boyle, Richard Broderick, Jason Budinoff, John Carpenter, Richard Caverly, Phil Chen, Steve Cooley, Christine Cottingham, Julie Crooke, Dave DiPietro, MIke DiPirro, Michael Femiano, Art Ferrer, Jackie Fischer, Jonathan Gardner, Lou Hallock, Kenny Harris, Kate Hartman, Martin Harwit, Lynne Hillenbrand, Tupper Hyde, Drew Jones, Jim Kellogg, Alan Kogut, Marc Kuchner, Bill Lawson, Javier Lecha, Maria Lecha, Amy Mainzer, Jim Mannion, Anthony Martino, Paul Mason, John Mather, Gibran McDonald, Rick Mills, Lee Mundy, Stan Ollendorf, Joe Pellicciotti, Dave Quinn, Kirk Rhee, Stephen Rinehart, Tim Sauerwine, Robert Silverberg, Terry Smith, Gordon Stacey, H. Philip Stahl, Johannes Staguhn, Steve Tompkins, June Tveekrem, Sheila Wall, Mark Wilson

Proceedings Volume 6265, 626540 (2006) https://doi.org/10.1117/12.669820

KEYWORDS: Space telescopes, Telescopes, Galactic astronomy, Infrared telescopes, Planets, Sensors, James Webb Space Telescope, Stars, Planetary systems, Spatial resolution

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Proceedings Article | 11 February 2003 Paper

The COR1 inner coronagraph for STEREO-SECCHI

William Thompson, Joseph Davila, Richard Fisher, Larry Orwig, John Mentzell, Samuel Hetherington, Rebecca Derro, Robert Federline, David Clark, Philip Chen, June Tveekrem, Anthony Martino, Joseph Novello, Richard Wesenberg, Orville StCyr, Nelson Reginald, Russell Howard, Kimberly Mehalick, Michael Hersh, Miles Newman, Debbie Thomas, Gregory Card, David Elmore

Proceedings Volume 4853, (2003) https://doi.org/10.1117/12.460267

KEYWORDS: Coronagraphy, Objectives, Sensors, Sun, Light scattering, Space operations, Charge-coupled devices, Stray light, Calibration, Imaging systems

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Proceedings Article | 11 September 2002 Paper

Return flux experiment REFLEX: spacecraft self-contamination

Heidi Manning, Nathan Frank, Jason Bursack, Bradford Johnson, Steve Benner, Philip Chen

Proceedings Volume 4774, (2002) https://doi.org/10.1117/12.481651

KEYWORDS: Space operations, Spectroscopy, Gases, Sensors, Argon, Data modeling, Krypton, Signal detection, Molecules, Contamination

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Proceedings Article | 20 September 2000 Paper

New contamination engineering technology for active on-orbit surface cleaning

Jimmy Clark, Douglas Jungwirth, Wilfried Krone-Schmidt, Mark Culpepper, Philip Chen

Proceedings Volume 4096, (2000) https://doi.org/10.1117/12.400822

KEYWORDS: Particles, Mirrors, Carbon dioxide, Contamination, Sensors, Space telescopes, Satellites, Telescopes, Space operations, Atmospheric particles

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Proceedings Article | 27 October 1998 Paper

Atomic oxygen erosion of a graphite coating on a TQCM onboard the Return Flux Experiment (REFLEX)

Steve Benner, Charles Lorentson, Philip Chen, Shaun Thomson

Proceedings Volume 3427, (1998) https://doi.org/10.1117/12.328489

KEYWORDS: Adaptive optics, Oxygen, Space operations, Coating, Carbon, Sensors, Contamination, Ultraviolet radiation, Control systems, Earth's atmosphere

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Proceedings Article | 11 November 1996 Paper

Incorporation of molecular adsorbers into future Hubble Space Telescope instruments

Shaun Thomson, Patricia Hansen, Philip Chen, Jack Triolo, Nancy Carosso

Proceedings Volume 2864, (1996) https://doi.org/10.1117/12.258339

KEYWORDS: Contamination, Space operations, Particles, Contamination control, Zeolites, Molecular electronics, Hubble Space Telescope, Observatories, Assembly equipment, Electronics

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Proceedings Article | 11 November 1996 Paper

Investigation of molecular angular distribution and its influence on contaminant transmission

Michael Woronowicz, Philip Chen

Proceedings Volume 2864, (1996) https://doi.org/10.1117/12.258299

KEYWORDS: Molecules, Monte Carlo methods, Virtual colonoscopy, Computer simulations, Contamination, Sensors, Reflection, Data modeling, Roads, Contamination analysis

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Proceedings Article | 19 October 1994 Paper

Verification of molecular contaminant and atomic oxygen modeling for the Environmental Verification Experiment for the Explorer Platform (EVEEP)

Charles Lorentson, Laura Ottenstein, Philip Chen, Rose Rodriguez

Proceedings Volume 2261, (1994) https://doi.org/10.1117/12.190159

KEYWORDS: Space operations, Adaptive optics, Data modeling, Oxygen, Contamination, Sun, Ultraviolet radiation, Crystals, Radiation effects, Space telescopes

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Proceedings Article | 1 November 1990 Paper

Surface accommodation of molecular contaminants

Philip Chen, Randy Hedgeland, Shaun Thomson

Proceedings Volume 1329, (1990) https://doi.org/10.1117/12.22614

KEYWORDS: Molecules, Contamination, Temperature metrology, Contamination control, Space operations, Receivers, Solids, Adsorption, Data centers, Control systems

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The transport of molecules, under vacuum conditions, from a source surface to a receiving surface is of major concern from the perspective of spacecraft contamination control. The transport phenomena involved is a complex mechanism comprising the physical characteristics of each surface, the properties of contaminant species participating, and the temperatures of both surfaces. Because of both the complex nature and the limited data available to describe such a phenomena, contamination modeling usually requires that a highly simplified engineering approach be undertaken. One area where this is particularly true is in the representation of the surface accommodation of incident molecules. When a molecule in the gas phase collides with the surface of a receiver it can either "stick" to that surface or be scattered away. Molecules accommodated by this surface become thermally equilibrated to the receiver temperature while the material that is not accommodated retains its original energy and undergoes specular reflection. The ratio of this thermally accommodated mass to the total incident mass is known as the "accommodation" or "sticking" coefficient. Most of the current theory and experimental work performed to date has been restricted to the accommodation coefficients of the rare gases in contact with metal surfaces3'10"1. UnfortUnately, the results generated by these studies cannot be made very useful to spacecraft contamination engineers who are predominantly interested in environments where contaminants are typically limited only to water and long-chain hydrocarbons. Because of this deficiency most current spacecraft contamination analyses are forced to rely on general mathematical expressions that consider the sticking coefficient to be only a direct function of the temperature gradient between the emitting and receiving surfaces. The major shortcoming of the simplified method presently in use is that it may provide an inadequate representation of the actual molecular transport occurring between surfaces. The purpose of this paper is, therefore, to study the nature of the transport mechanisms involved in the adsorption of high molecular weight gases on typical spacecraft surfaces, the overall concept of the sticking coefficient, and the quantitative and qualitative theory involved. In addition, this paper will examine some of the existing molecular accommodation data as it relates to spacecraft applications, as well as present new experimental data gathered by the Contamination Control Section of the Goddard Space Flight Center (GSFC). All this information will then be correlated and used to verify the accuracy of the most common sticking coefficient equations in use by contamination analyses.