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  • 1
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    High- and Mid-temperature Superconducting Sensors for Far IR/Sub-mm Applications in Space (2004)
    In:  CASI
    Details
    Publication Date: 2018-06-06
    Description: In this review paper an overview of the potential applications of high Tc (approx. 90 K) superconductors (HTS) and mid-Tc (approx. 39 K) superconductors (MTS) thin films in far IR/Sub-mm thermal detectors is presented. HTSs (YBCO, GdBCO etc.) were discovered in the late 80s while superconductivity in MgB2, an MTS, was discovered in 2001. The sharp transition in transport properties of HTS has allowed the fabrication of composite infrared thermal detectors (bolometers) with better figures of merit than thermopile detectors - thermopiles are currently on board the CIRS instrument on the Cassini mission to Saturn. The potential for developing even more sensitive sensors for IR/Sub-mm applications using MgB2 thin films is assessed. Current MgB2 thin film deposition techniques and film quality are reviewed.
    Keywords: Instrumentation and Photography
    Type: International Thermal Detectors Workshop (TDW 2003); 4-1 - 4-4; NASA/CP-2004-212748
    Format: application/pdf
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  • 2
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    The Case for Moderately-Cooled, Far-Infrared Thermal Detectors (2004)
    In:  CASI
    Details
    Publication Date: 2018-06-06
    Description: There are moderately-cooled (around 77K) infrared detectors, for instance InSb (around 5 microns wavelength) and HgCdTe (around 15 to 20 microns wavelength). However for longer wavelengths there are either uncooled thermal-type detectors or highly cooled (about 4K and lower) quantum and thermal detectors, with the notable exception of high Tc superconductor detectors. We will describe certain long-wavelength applications in space where only moderate cooling is feasible, and where better sensitivity is required than possible with uncooled detectors. These requirements could be met with high Tc bolometers, but it may also be prudent to develop other technologies. Additionally, over the past 16 years a marketplace has not developed for the commercial production of high Tc bolometers, indicating their production may be a natural endeavor for government laboratories.
    Keywords: Instrumentation and Photography
    Type: International Thermal Detectors Workshop (TDW 2003); 3-1 - 3-5; NASA/CP-2004-212748
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  • 3
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    In-flight Far-Infrared Performance of the CIRS Instrument on Cassini (2004)
    In:  CASI
    Details
    Publication Date: 2018-06-06
    Description: The Composite Infrared Spectrometer (CIRS) on-board Cassini consists of two interferometers: a conventional Michelson for the mid-infrared; and a Martin-Puplett type in the far-infrared employing wire grid polarizers to split, recombine and analyze the radiation. The far-IR focal plane (FP1) assembly uses two thermopile detectors to measure the final transmitted and reflected beams at the polarizer-analyzer: if one fails, the interferometer can still operate, albeit with a lower efficiency. The combined effect is for good response from 10 to 300/cm, and declining response to 600/cm. This paper will examine in-flight performance of the far-IR interferometer, including NESR and response. Regular noise spikes, resulting from pickup from other electrical sub-systems has been found on the CIRS interferograms, and the removal of these effects is discussed. The radiometric calibration is described, and then we show how the calibration was applied to science data taken during the Jupiter flyby of December 2000. Finally, we discuss signal-to-noise on the calibrated spectra, emphasizing limitations of the current instrument and the potential for improvement in future missions.
    Keywords: Engineering (General)
    Type: International Thermal Detectors Workshop (TDW 2003); 1-12 - 1-15; NASA/CP-2004-212748
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  • 4
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    Bolometer Simulation Using SPICE (2004)
    In:  CASI
    Details
    Publication Date: 2018-06-06
    Description: A general model is presented that assimilates the thermal and electrical properties of the bolometer - this block model demonstrates the Electro-Thermal Feedback (ETF) effect on the bolometers performance. This methodology is used to construct a SPICE model that by way of analogy combines the thermal and electrical phenomena into one simulation session. The resulting circuit diagram is presented and discussed.
    Keywords: Instrumentation and Photography
    Type: International Thermal Detectors Workshop (TDW 2003); 3-17 - 3-21; NASA/CP-2004-212748
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  • 5
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    In situ Pulsed Laser Deposition of C-Axis Oriented MgB2 Films and Their Characterization (2004)
    In:  Other Sources
    Details
    Publication Date: 2019-07-18
    Description: The recent discovery of an intermetallic superconductor MgB2 has renewed interest in the area of superconductivity not only because of fundamental understanding of superconductivity but also due to its potential applicability in devices such as thermal detectors. Considerable amount of research has been devoted to obtain MgB2 films by an all in situ growth technique. We have grown MgB2 thin films by an all in situ pulsed laser deposition process from pure B and Mg targets. Ultrathin layers of B and Mg were deposited in a multilayer configuration. Hundreds of such Mg-B bilayers with a capping Mg layer on the top were deposited on sapphire substrate. These depositions were done in high vacuum (approx. 10(exp -7) Torr) and at room temperature. After deposition, such a configuration was annealed at high temperature for a short time in a forming gas (4% H2 in Ar). The best films, obtained by this procedure, showed superconducting transition temperature approx. 30 K. These films have been characterized by x-ray diffraction, Rutherford Backscattering Spectrometry, AC susceptibility-, resistivity- (with and without magnetic field) and 1/f noise-measurements. The physical properties of these films will be presented and discussed.
    Keywords: Solid-State Physics
    Type: International Thermal Detectors Workshop (TDW 2003); P2; NASA/CP-2004-212748
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  • 6
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    A 0.18 micrometer CMOS Thermopile Readout ASIC Immune to 50 MRAD Total Ionizing Dose (SI) and Single Event Latchup to 174MeV-cm(exp 2)/mg (2014)
    In:  CASI
    Details
    Publication Date: 2019-08-13
    Description: Radiation hardened by design (RHBD) techniques allow commercial CMOS circuits to operate in high total ionizing dose and particle fluence environments. Our radiation hard multi-channel digitizer (MCD) ASIC (Figure 1) is a versatile analog system on a chip (SoC) fabricated in 180nm CMOS. It provides 18 chopper stabilized amplifier channels, a 16- bit sigma-delta analog-digital converter (SDADC) and an on-chip controller. The MCD was evaluated at Goddard Space Flight Center and Texas A&M University's radiation effects facilities and found to be immune to single event latchup (SEL) and total ionizing dose (TID) at 174 MeV-cm(exp 2)/mg and 50 Mrad (Si) respectively.
    Keywords: Solid-State Physics
    Type: GSFC-E-DAA-TN17980 , International Workshop on Instrumentation for Planetary Missions (IPM-2014); Nov 04, 2014 - Nov 07, 2014; Greenbelt, MD; United States
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  • 7
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    Update on the Fabrication and Performance of 2-D Arrays of Superconducting Magnesium Diboride (MgB2) Thermal Detectors for Outer-Planets Exploration (2011)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Detectors with better performance than the current thermopile detectors that operate at room temperature will be needed at the focal plane of far-infrared instruments on future planetary exploration missions. We will present an update on recent results from the 2-D array of MgB2 thermal detectors being currently developed at NASA Goddard. Noise and sensitivity results will be presented and compared to thermal detectors currently in use on planetary missions.
    Keywords: Fluid Mechanics and Thermodynamics
    Type: GSFC.CPR.5354.2011 , Joint European Planetary Science Congress and Division of Planetary Science (DPS) annual meeting; Oct 02, 2011 - Oct 07, 2011; Nantes; France
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  • 8
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    Dual-Telescope Multi-Channel Thermal-Infrared Radiometer for Outer Planet Fly-By Missions (2016)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The design of a versatile dual-telescope thermal-infrared radiometer spanning the spectral wavelength range 8-200 microns, in five spectral pass bands, for outer planet fly-by missions is described. The dual- telescope design switches between a narrow-field-of-view and a wide-field-of-view to provide optimal spatial resolution images within a range of spacecraft encounters to the target. The switchable dual-field- of-view system uses an optical configuration based on the axial rotation of a source-select mirror along the optical axis. The optical design, spectral performance, radiometric accuracy, and retrieval estimates of the instrument are discussed. This is followed by an assessment of the surface coverage performance at various spatial resolutions by using the planned NASA Europa Mission 13-F7 fly-by trajectories as a case study.
    Keywords: Lunar and Planetary Science and Exploration; Instrumentation and Photography
    Type: GSFC-E-DAA-TN40294 , Acta Astronautica (ISSN 0094-5765); 128; 628-639
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  • 9
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    A 2-D Array of Superconducting Magnesium Diboride (MgB2) Far-IR Thermal Detectors for Planetary Exploration (2009)
    In:  Other Sources
    Details
    Publication Date: 2019-07-19
    Description: A 2-D array of superconducting Magnesium Diboride(MgB2) far IR thermal detectors has been fabricated. Such an array is intended to be at the focal plane of future generation thermal imaging far-IR instruments that will investigate the outer planets and their icy moons. Fabrication and processing of the pixels of the array as well as noise characterization of architectured MgB2 thin films will be presented. Challenges and solutions for improving the performance of the array will be discussed.
    Keywords: Lunar and Planetary Science and Exploration
    Type: 41st Annual Meeting of the Division for Planetary Sciences of the American Astronomical Society; Oct 04, 2009 - Oct 09, 2009; Fajardo; Puerto Rico
    Format: text
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