Dr. William P. Chu Profile

Dr. William P. Chu

Senior Scientist at NASA Langley Research Ctr

SPIE Involvement:

Author

Publications (20)

Proceedings Article | 14 October 2004 Paper

Remote sensing experiment implementation: lessons learned

Michael Cisewski, William Chu, Kory Priestley, Larry Gordley, Ed Mauldin, Philip Brown

Proceedings Volume 5548, (2004) https://doi.org/10.1117/12.560980

KEYWORDS: Calibration, Software development, Climatology, Data modeling, Remote sensing, Algorithm development, Instrument modeling, Environmental sensing, Sensors, Error analysis

Read Abstract +

Proceedings Article | 3 November 2003 Paper

First-year measurements of stratospheric aerosol and gas experiment III/meteor

William Chu, Chip Trepte, Joe Zawodny, Larry Thomason, Michael Cisewski, Didier Rault, Ghassan Taha, Randy Moore, Dave Risley

Proceedings Volume 5157, (2003) https://doi.org/10.1117/12.506794

KEYWORDS: Aerosols, Ozone, Space operations, Scattering, NOx, Sensors, Atmospheric particles, Charge-coupled devices, Space telescopes, Telescopes

Read Abstract +

Proceedings Article | 16 June 2003 Paper

Intercomparison of EGA, CGA, and LBL forward model computation schemes for SAGE III water vapor retrieval

Er Chiou, William Chu, Larry Thomason, D. Chris Benner, Anne Edwards

Proceedings Volume 4897, (2003) https://doi.org/10.1117/12.466836

KEYWORDS: Absorption, Databases, Atmospheric modeling, Data modeling, Solar radiation models, Aerosols, Earth's atmosphere, Atmospheric particles, Sensors, Composites

Read Abstract +

Proceedings Article | 9 April 2003 Paper

Initial operation and checkout of stratospheric aerosol gas experiment and Meteor-3M satellite

Shahid Habib, Leonid Makridenko, William Chu, Rashid Salikhov, Alvah Moore, Charles Trepte, Michael Cisewski

Proceedings Volume 4891, (2003) https://doi.org/10.1117/12.465982

KEYWORDS: Satellites, Space operations, Aerosols, Ozone, Transmitters, Aerospace engineering, Atmospheric particles, Control systems, Computing systems, Navigation systems

Read Abstract +

Under a joint agreement between the National Aeronautics and Space Agency (NASA) and the Russian Aviation and Space Agency (RASA), the Stratospheric Aerosol Gas Experiment III (SAGE III) instrument was launched in low earth orbit on December 10, 2001 aboard the Russian Meteor-3M(1) satellite from the Baikonur Cosmodrome. SAGE III is a spectrometer that measures attenuated radiation in the 282 nm to 1550 nm wavelength range to obtain the vertical profiles of ozone, aerosols, and other chemical species that are critical in studying the trends for the global climate change phenomena. This instrument version is more advanced than any of the previous versions and has more spectral bands, elaborate data gathering and storage, and intelligent terrestrial software. There are a number of Russian scientific instruments aboard the Meteor satellite in addition to the SAGE III instrument. These instruments deal with land imaging and biomass changes, hydro-meteorological monitoring, and helio-geophysical research. This mission was under development for over a period of six years and offered a number of unique technical and program management challenges for both Agencies. SAGE III has a long space heritage, and four earlier versions of this instrument have flown in space for nearly two decades now. In fact, SAGE II, the fourth instrument, is still flying in space on NASA's Earth Radiation Budget Satellite (ERBS), and has been providing important atmospheric data over the last 18 years. It has provided vital ozone and aerosol data in the mid latitudes and has contributed vastly in ozone depletion research. Ball Aerospace built the instrument under Langley Research Center's (LaRC) management. This paper presents the process and approach deployed by the SAGE III and the Meteor teams in performing the initial on-orbit checkout. It further documents a number of early science results obtained by deploying low risk, carefully coordinated procedures in resolving the serious operational issues of this satellite.

Proceedings Article | 24 September 2002 Paper

SAGE III measurements

William Chu, Charles Trepte, Robert Veiga, Michael Cisewski, Ghassan Taha

Proceedings Volume 4814, (2002) https://doi.org/10.1117/12.451515

KEYWORDS: Aerosols, Ozone, Atmospheric particles, Calibration, Space operations, Sensors, Charge-coupled devices, NOx, Earth's atmosphere, Sun

Read Abstract +

Proceedings Article | 30 January 2002 Paper

SAGE III meteor mission: pre-launch preparation, post-launch operation, and initial on-orbit data

William Chu, Robert Veiga, Michael Cisewski, Charles Trepte

Proceedings Volume 4485, (2002) https://doi.org/10.1117/12.454243

KEYWORDS: Space operations, Calibration, Aerosols, Sun, Sensors, Charge-coupled devices, Ozone, Atmospheric particles, Earth's atmosphere, Spectroscopy

Read Abstract +

Proceedings Article | 30 January 2002 Paper

SAGE III test model: ground-based coincident measurements with the SAGE III flight instruments and field characterization measurements

Robert Veiga, Brian Wenny, Gary Hansen, Patricia Lucker, William Chu

Proceedings Volume 4485, (2002) https://doi.org/10.1117/12.454244

KEYWORDS: Atmospheric modeling, Charge-coupled devices, Spectroscopy, Signal to noise ratio, Absorption, Instrument modeling, Aerospace engineering, Venus, Jupiter, Aerosols

Read Abstract +

Proceedings Article | 30 January 2002 Paper

Characterization and error analyses of SAGE III water vapor retrieval

Er-Woon Chiou, William Chu, Larry Thomason

Proceedings Volume 4485, (2002) https://doi.org/10.1117/12.454246

KEYWORDS: Aerosols, Absorption, Ozone, Computer simulations, Optimization (mathematics), Diagnostics, Error analysis, Matrices, NOx, Atmospheric modeling

Read Abstract +

Proceedings Article | 8 December 1999 Paper

Upper stratospheric temperature climatology derived from SAGE II observations: preliminary results

Pi-Huan Wang, Derek Cunnold, H. Wang, William Chu, Larry Thomason

Proceedings Volume 3867, (1999) https://doi.org/10.1117/12.373063

KEYWORDS: Stratosphere, Temperature metrology, Knowledge management, Climatology, Satellites, Optical testing, Mass attenuation coefficient, Error analysis, Atmospheric sensing, Data processing

Read Abstract +

Proceedings Article | 20 October 1999 Paper

Overview of the SAGE III experiment

William Chu, Lemuel Mauldin

Proceedings Volume 3756, (1999) https://doi.org/10.1117/12.366363

KEYWORDS: Aerosols, Ozone, Atmospheric particles, Calibration, Sensors, NOx, Earth's atmosphere, Charge-coupled devices, Atmospheric monitoring, Space operations

Read Abstract +

Proceedings Article | 20 October 1999 Paper

Meteor 3M/SAGE III mission operations

Michael Cisewski, Sudha Natarajan, Robert Borchardt, Sharon Graves, William Chu

Proceedings Volume 3756, (1999) https://doi.org/10.1117/12.366369

KEYWORDS: Space operations, Receivers, Data processing, Statistical analysis, Instrumentation engineering, Atmospheric sciences, Data centers, Lead, Antennas, Sensors

Read Abstract +

Proceedings Article | 20 October 1999 Paper

Stratospheric aerosol and gas experiment III (SAGE III) mission aboard the International Space Station

Lorelei Szatkowski, Obie Bradley, Lemuel Mauldin, Mary Wusk, William Chu, Lester Farwell, Piero Galeone

Proceedings Volume 3756, (1999) https://doi.org/10.1117/12.366370

KEYWORDS: Sensors, Aerosols, Aerospace engineering, Space operations, Electronics, Spectroscopy, CCD image sensors, Control systems, Earth sciences, Ozone

Read Abstract +

Proceedings Article | 14 December 1998 Paper

Stratospheric Aerosol and Gas Experiment III

Larry Thomason, William Chu, Michael Pitts

Proceedings Volume 3495, (1998) https://doi.org/10.1117/12.332682

KEYWORDS: Aerosols, NOx, Ozone, Calibration, Climatology, Sensors, Stratosphere, Clouds, Temperature metrology, Troposphere

Read Abstract +

Proceedings Article | 27 October 1998 Paper

Effect of the induced contamination environment on the long-term degradation of optical payloads

John Rawls, Lemuel Mauldin, William Chu, Carl Maag

Proceedings Volume 3427, (1998) https://doi.org/10.1117/12.328518

KEYWORDS: Contamination, Diffusers, Space operations, Contamination control, Ultraviolet radiation, Satellites, Spectroscopy, Aerosols, Ozone, Calibration

Read Abstract +

Proceedings Article | 18 September 1997 Paper

Stratospheric aerosol and gas experiment III

William Chu, M. Patrick McCormick, Joseph Zawodny, Lemuel Mauldin

Proceedings Volume 3117, (1997) https://doi.org/10.1117/12.283815

KEYWORDS: Aerosols, Sensors, Ozone, Calibration, Earth's atmosphere, Algorithm development, Charge-coupled devices, NOx, Climatology, Atmospheric monitoring

Read Abstract +

Proceedings Article | 13 May 1994 Paper

Comparison of dry-etch approaches for tungsten patterning

Elizabeth Dobisz, Charles Eddy, John Kosakowski, Orest Glembocki, Loretta Shirey, Kelly Foster, William Chu, Kee Rhee, D. Park, Christie Marrian, Martin Peckerar

Proceedings Volume 2194, (1994) https://doi.org/10.1117/12.175803

KEYWORDS: Etching, Reactive ion etching, Photomasks, Chemistry, Chromium, Ions, Argon, X-rays, Optical lithography, Electron beam lithography

Read Abstract +

Proceedings Article | 13 May 1994 Paper

Reactive-ion etching of tungsten for high-resolution x-ray masks

Loretta Shirey, Kelly Foster, William Chu, John Kosakowski, Kee Rhee, Elizabeth Dobisz, Charles Eddy, D. Park, I. Peter Isaacson, Daniel McCarthy, Christie Marrian, Martin Peckerar

Proceedings Volume 2194, (1994) https://doi.org/10.1117/12.175802

KEYWORDS: Etching, Chromium, Tungsten, Reactive ion etching, Photomasks, Reflectivity, X-rays, Electron beam lithography, Chemistry, Dry etching

Read Abstract +

Proceedings Article | 25 August 1993 Paper

Stratospheric aerosol and gas experiment III (SAGE III)

Michael McCormick, Joseph Zawodny, William Chu, James Baer, J. Guy, Arthur Ray

Proceedings Volume 1939, (1993) https://doi.org/10.1117/12.152840

KEYWORDS: Sensors, Aerosols, Charge-coupled devices, Spectroscopy, Satellites, Clouds, Stratosphere, Telescopes, NOx, Atmospheric particles

Read Abstract +

Proceedings Article | 1 September 1991 Paper

Stratospheric aerosol and gas experiment III: aerosol and trace gas measurements for the Earth Observing System

Michael McCormick, William Chu, Joseph Zawodny, Lemuel Mauldin, Leonard McMaster

Proceedings Volume 1491, (1991) https://doi.org/10.1117/12.46655

KEYWORDS: Aerosols, Ozone, Clouds, Atmospheric chemistry, NOx, Remote sensing, Atmospheric particles, Atmospheric modeling, Atmospheric sensing, Calibration

Read Abstract +

Proceedings Article | 1 September 1991 Paper

Calibration for the SAGE III/EOS instruments

William Chu, Michael McCormick, Joseph Zawodny, Leonard McMaster

Proceedings Volume 1491, (1991) https://doi.org/10.1117/12.46675

KEYWORDS: Calibration, Sensors, Sun, Mirrors, Charge-coupled devices, Spectroscopy, Refractive index, Remote sensing, Spectral calibration, Mathematical modeling

Read Abstract +

Showing 5 of 20 publications

Conference Committee Involvement (2)

Optical Spectroscopic Techniques and Instrumentation for Atmospheric and Space Research V

7 August 2003 | San Diego, California, United States

Asia-Pacific Symposium on Remote Sensing of the Atmosphere, Environment, and Space

14 September 1998 | Beijing, China

View contact details

UPDATE YOUR PROFILE

Is this your profile? Update it now.

Sign into your SPIE.org account

Don’t have a profile and want one?

Create an account on SPIE.org

Keywords/Phrases

Search In:

Publication Years