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  • 1
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    Design and development of a multibeam 1.4 GHz pushbroom microwave radiometer (1986)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The design and operation of a multiple beam, digital signal processing radiometer are discussed. The discussion includes a brief description of each major subsystem and an overall explanation of the hardware requirements and operation. A series of flight tests was conducted in which sea-truth sites, as well as an existing radiometer were used to verify the Pushbroom Radiometer performance. The results of these tests indicate that the Pushbroom Radiometer did meet the sensitivity design goal of 1.0 kelvin, and exceeded the accuracy requirement of 2.0 kelvin. Additional performance characteristics and test results are also presented.
    Keywords: ELECTRONICS AND ELECTRICAL ENGINEERING
    Type: NASA-TM-89005 , NAS 1.15:89005
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Recent developments on a 128 x 128 indium antimonide/FET switch hybrid imager for low-background applications (1986)
    In:  Other Sources
    Details
    Publication Date: 2019-07-27
    Description: By combining high-quality mesa photovoltaic indium antimonide detector material with a silicon x-y FET switch multiplexer, a useful infrared area detector has been developed. This device is intended for low-background applications, where high sensitivity is required. Initial characterization of the detector at 80 K showed a KTC limited read noise of less than 1000 electrons, good dark current, responsivity uniformity, and a maximum readout rate of 10 MHz. The hybrid mating technology has sufficient precision to allow expansion to a 256 x 256 format. The dark current in the detector material is sufficiently low to allow full-frame integration, even with arrays as large as 256 x 256 elements.
    Keywords: ELECTRONICS AND ELECTRICAL ENGINEERING
    Type: Infrared detectors, sensors, and focal plane arrays; Aug. 21, 22, 1986; San Diego, CA; United States
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Short wavelength 128 by 128 focal plane arrays for remote sensing applications (1988)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Short-wavelength (1-2.5-micron) 128x128 focal plane arrays have been fabricated and demonstrated with high pixel yields and dark-current-limited performance. The detector material is HgCdTe grown by LPE on a sapphire substrate which yields high-performance uniform detectors. The detector arrays were characterized at temperatures of 80-150 K; the peak quantum efficiency at 2.4 microns is 80 percent. The multiplexer is a Reticon FET switch with output amplifiers. It is noted that the long-term goal of this project is to develop a 150x1000 mosaicked focal plane for use in the HIRIS instrument on the Earth Observing System.
    Keywords: ELECTRONICS AND ELECTRICAL ENGINEERING
    Type: Focal Plane Arrays: Technology and Applications; Nov 19, 1987 - Nov 20, 1987; Cannes; France
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    A V-grooved AlGaAs/GaAs passivated pn junction (1987)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A passivated, V-grooved GaAs solar cell offers important advantages in terms of improved optical coupling, higher short-circuit current, and increased tolerance to particle radiation when compared to the planar cell configuration. An AlGaAs epilayer has been deposited on a p-type GaAs epilayer grown on an n-type V-grooved GaAs surface using MOCVD. A wet chemical etching process was used to produce a V-pattern with a 7.0-micron periodicity. Reflectivity measurements substantiate the expected decrease in solar reflectance. Scanning electron microscopy techniques were used to confirm the presence of the AlGaAs layer and verify the existence of a pn junction.
    Keywords: ELECTRONICS AND ELECTRICAL ENGINEERING
    Type: IEEE Photovoltaic Specialists Conference; May 04, 1987 - May 08, 1987; New Orleans, LA; United States
    Format: text
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    NASA TECHNICAL REPORTS
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