Dr. Dong L. Wu Profile

Dr. Dong L. Wu

at NASA Goddard Space Flight Ctr

SPIE Involvement:

Author

Proceedings Article | 15 June 2023 Presentation + Paper

Dual and multi-spectral band SLS infrared camera systems

Murzy Jhabvala, Donald Jennings, Kyle Turck, Compton Tucker, Allen Lunsford, Christine Jhabvala, Analia Cillis, Joel Mccorkel, Jason Hair, Doug Morton, Dong Wu, Markus Loose, Fred Wang, Tilak Hewagama, Mani Sundaram, Jason Bundas, K. Choi, Corey Tucker

Proceedings Volume 12514, 1251404 (2023) https://doi.org/10.1117/12.2666075

KEYWORDS: Dark current, Equipment, Optical filters, Spectral response, Infrared imaging, Readout integrated circuits, Quantum efficiency

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Based on the recent success of our strained-layer superlattice (SLS)-based infrared (IR) camera that performed Earth imaging from the International Space Station (ISS) in 2019 we have built, what we consider, to be the next generation multi-band SLS imaging system. The Compact Thermal Imager (CTI) was installed on the Robotic Refueling Mission 3 (RRM3) and attached to the exterior of the ISS. From this location we were able to capture 15 million images of a multitude of fires around the globe in 2019. This unexpected trove of data initiated quite a bit of scientific interest to further utilize this imaging capability but would include features to more precisely monitor terrestrial fires and other surface phenomena. To this end, we developed a technique to install specific bandpass filters directly onto the SLS detector hybrid assembly. Utilizing this technique we have built a CTI-2 camera system with two filters, 4 and 11μm, and have made a second detector assembly with six filter bands from 4- 12μm. This second system will also be used to supplement Landsat remote imaging monitoring approximate land surface temperatures, monitor evapotranspiration, sea ice and glacier dynamics. The CTI-2 camera is based on a 1,024x1,024 (1kx1k) format SLS detector hybridized to a FLIR ISC0404 readout integrated circuit (ROIC). The six band SLS focal plane array is based on the 640x512 FLIR ISC 9803 ROIC. This camera system is based on the Landsat 8 and 9 Thermal IR Sensors (TIRS) instrument and one of its purposes is to perform ground truthing for the Landsat 8/9 data at higher spectral resolution. Both Landsat TIRS instruments are dual band thermal IR sensors centered on 11 and 12μm (each with about a 1μm bandpass). Both of our SLS systems utilize a Ricor K548 cryocooler. To streamline costs and development time we used commercial optics and both commercial and custom NASA electronic components. A primary feature of these camera systems is the incorporation of specific filters to collect fire data at ~3.9μm and thermal data at ~11μm. The CTI- 2 instrument is designed for 37 m /pixel spatial resolution from 410km orbit (ISS orbit). In this paper, we will present the design and performance of the focal plane, optics, electronics and mechanical structure of the dual-band CTI-2 and the focal plane performance of the six-band focal plane.

Proceedings Article | 3 June 2022 Presentation + Paper

Near space demonstration of a compact LWIR spectro-polarimeter for ice cloud measurements

Kira Hart Shanks, Russell Chipman, Jaclyn John, Jeremy Parkinson, Dong Wu, Meredith Kupinski

Proceedings Volume 12112, 121120L (2022) https://doi.org/10.1117/12.2618406

KEYWORDS: Clouds, Polarization, Long wavelength infrared, Sensors, Temperature metrology, Polarimetry, Staring arrays, Ozone, Electronics, Error analysis

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Proceedings Article | 1 August 2021 Presentation + Paper

UV linear stokes imaging of optically thin clouds

Clarissa DeLeon, James Heath, W. Reed Espinosa, Dong Wu, Meredith Kupinski

Proceedings Volume 11833, 1183302 (2021) https://doi.org/10.1117/12.2595161

KEYWORDS: Aerosols, Clouds, Ultraviolet radiation, Nonuniformity corrections, Scattering, Polarization, Atmospheric particles, Polarimetry, UV optics, Polishing

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Proceedings Article | 1 August 2021 Presentation + Paper

Stokes resolved differential temperature: an important metric of polarimetric precision in the long-wave infrared

Kira Hart Shanks, Russell Chipman, Dong Wu, Meredith Kupinski

Proceedings Volume 11833, 118330I (2021) https://doi.org/10.1117/12.2595428

KEYWORDS: Polarimetry, Long wavelength infrared, Sensors, Calibration, Polarization, Infrared radiation, Polarizers, Thermography

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SPIE Journal Paper | 3 July 2020 Open Access

First results from an uncooled LWIR polarimeter for cubesat deployment

Kira Hart, Meredith Kupinski, Dong Wu, Russell Chipman

OE, Vol. 59, Issue 07, 075103, (July 2020) https://doi.org/10.1117/12.10.1117/1.OE.59.7.075103

KEYWORDS: Polarimetry, Modulation, Cameras, Long wavelength infrared, Polarization, Calibration, Sensors, Linear polarizers, Data modeling

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Proceedings Article | 22 May 2020 Presentation + Paper

Linear Stokes measurement of thermal targets using compact LWIR spectropolarimeter

Kira Hart, Meredith Kupinski, Dong Wu, Russell Chipman

Proceedings Volume 11412, 114120H (2020) https://doi.org/10.1117/12.2557887

KEYWORDS: Polarimetry, Modulation, Long wavelength infrared, Spectral resolution, Polarization, Sensors, Calibration, Linear polarizers, Monochromators

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Proceedings Article | 10 September 2019 Presentation

Demonstration of LWIR channeled spectro-polarimeter (Conference Presentation)

Kira Hart, Giovanni De Amici, Todd Horne, Meredith Kupinski, Kyler Langworthy, Adriana Stohn, Dong Wu, Russell Chipman

Proceedings Volume 11132, 1113207 (2019) https://doi.org/10.1117/12.2532075

KEYWORDS: Long wavelength infrared, Polarimetry, Clouds, Polarization, Modulation, Linear polarizers, Infrared spectroscopy, Infrared radiation, Wave plates, Crystals

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Proceedings Article | 30 August 2019 Open Access

IceCube: spaceflight demonstration of 883-GHz cloud radiometer for future science

Dong Wu, Jeffrey Piepmeier, Jaime Esper, Negar Ehsan, Paul Racette, Thomas Johnson, Brian Abresch, Eric Bryerton

Proceedings Volume 11131, 1113103 (2019) https://doi.org/10.1117/12.2530589

KEYWORDS: Clouds, Radiometry, Space operations, Receivers, Calibration, Sensors

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Proceedings Article | 22 October 2018 Paper

Compact Midwave Imaging System (CMIS) for retrieval of cloud motion vectors (CMVs) and cloud geometric heights (CGHs)

Michael Kelly, Dong Wu, Arnold Goldberg, Ivan Papusha, John Wilson, James Carr, John Boldt, Jacob Greenberg, Frank Morgan, Sam Yee, Andrew Heidinger, Lauren Mehr

Proceedings Volume 10776, 107760D (2018) https://doi.org/10.1117/12.2324612

KEYWORDS: Clouds, Satellites, Sensors, Computer generated holography, Imaging systems, Data modeling, MODIS, Optical flow, Space operations

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Proceedings Article | 14 May 2018 Paper

Compact LWIR polarimeter for cirrus ice properties

Kira Hart, Russell Chipman, Dong Wu

Proceedings Volume 10655, 106550V (2018) https://doi.org/10.1117/12.2305106

KEYWORDS: Polarization, Diffraction gratings, Modulation, Polarimetry, Long wavelength infrared, Prisms, Optical design, Clouds, Calibration, Wave plates

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Proceedings Article | 2 May 2018 Presentation + Paper

Compact midwave imaging system (CMIS) for weather satellite applications

Arnold Goldberg, Michael Kelly, John Boldt, Dong Wu, Andrew Heidinger, John Wilson, Kyle Ryan, M. Morgan, Jeng Yee, Jacob Greenberg, Charles Hibbitts

Proceedings Volume 10641, 1064103 (2018) https://doi.org/10.1117/12.2305382

KEYWORDS: Sensors, Clouds, Mid-IR, Nonuniformity corrections, Satellites, Electronics, Temperature metrology, Calibration, Superlattices, Staring arrays

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Proceedings Article | 20 July 2016 Paper

A 2 THz Schottky solid-state heterodyne receiver for atmospheric studies

Jeanne Treuttel, Erich Schlecht, Jose Siles, Choonsup Lee, Robert Lin, Bertrand Thomas, David Gonzalez-Olvero, Jeng-Hwa Yee, Dong Wu, Imran Mehdi

Proceedings Volume 9914, 99141O (2016) https://doi.org/10.1117/12.2233744

KEYWORDS: Terahertz radiation, Receivers, Heterodyning, Diodes, Oscillators, Amplifiers, Diodes, Signal attenuation, Resistance, Double sideband modulation, Gallium arsenide

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Proceedings Article | 23 September 2009 Paper

Sub-millimeter wave radiometer for observation of cloud ice: a proposal for Japanese mission

Jana Mendrok, Dong Wu, Stefan Bühler, Carlos Jimenez, Yasuko Kasai

Proceedings Volume 7474, 74740T (2009) https://doi.org/10.1117/12.830704

KEYWORDS: Clouds, Particles, Sensors, Receivers, Atmospheric particles, Radiometry, Climatology, Absorption, Extremely high frequency, Satellites

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Proceedings Article | 19 August 1998 Paper

Remote sensing of clouds and water vapor by microwave limb sounding

Dong Wu

Proceedings Volume 3503, (1998) https://doi.org/10.1117/12.319508

KEYWORDS: Clouds, Scattering, Particles, Atmospheric particles, Terbium, Microwave radiation, Radiometry, Remote sensing, Radiative transfer, Atmospheric modeling

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Showing 5 of 14 publications

SPIE Conference Volume | 19 August 1998

Microwave Remote Sensing of the Atmosphere and Environment

Conference Committee Involvement (2)

Microwave Remote Sensing of the Atmosphere and Environment

15 September 1998 | Beijing, China

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

14 September 1998 | Beijing, China

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