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  • 1
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    Mercury cadmium telluride short- and medium-wavelength infrared staring focal plane arrays (1987)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: Short and medium IR wavelength 64 x 64 hybrid focal plane arrays (FPAs) have been developed using sapphire-grown HgCdTe. The short wavelength arrays were developed for a prototype airborne imaging spectrometer, while those of medium wavelength are suitable for tactical missile seekers and strategic surveillance systems. Attention is presently given to results obtained for these FPAs' current-voltage characteristics, as well as for their characterization at different temperatures. The detector arrays were also mated to a multiplexer and characterized under different operating conditions. The unit cell size used is 52 x 52 microns.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Optical Engineering (ISSN 0091-3286); 26; 201-208
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    HgCdTe 256x256 NWIR FPA (1989)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: Researchers developed a HgCdTe 256x256 focal plane array (FPA) which operates in the 1 to 5 micron band. This is presently the largest demonstrated HgCdTe FPA. The detector material is HgCdTe on sapphire (PACE-1 technology) which has a low thermal expansion mismatch with silicon. The multiplexer is a CMOS FET-switch device processed through a commercial silicon foundry. The multiplexer input is direct injection and the charge capacity is about 2 times 10 to the 7th power electrons. The kTC limited read noise is 400 electrons. Researchers demonstrated high background imaging using the device. The broadband quantum efficiency is measured to be 59 percent. Dark currents less than 0.1 pA were measured at 77 K for detectors processed on PACE-1 material with 4.9 microns cutoff. The dark currents decrease as the temperature is lowered, and researchers are presently studying the T less than 77 K characteristics. The interconnect yield is greater than 95 percent. The devices are available for astronomical applications.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA, Ames Research Center, Proceedings of the Third Infrared Detector Technology Workshop; p 413-419
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Future directions for NICMOS arrays (1989)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: The Near Infrared Camera and Multi-Object Spectrometer (NICMOS) for the Hubble Space Telescope (HST) requires focal plane arrays of 256x256 pixels for both its cameras and its spectrometers. The new arrays, developed by the Rockwell Corporation for NICMOS, have 40 microns pixels of HgCdTe bump bonded to a switched MOSFET readout. Expected read noise and dark current for the arrays at 60 K are 30 e and 1 e/sec. respectively. The basis for these numbers is previous experience with 128x128 arrays.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA, Ames Research Center, Proceedings of the Third Infrared Detector Technology Workshop; p 331-336
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  • 4
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    Low noise HgCdTe 128 x 128 SWIR FPA for Hubble space telescope (1989)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: Large area focal plane arrays of unprecedented performance were developed for use in Near Infrared Camera and Multi-Object Spectrometer (NICMOS), a proposed Hubble Space Telescope refurbishment instrument. These FPAs are 128x128-element, HgCdTe hybrid arrays with a cutoff wavelength of 2.5 microns. The multiplexer consists of a CMOS field effect transistor switch array with a typical mean readout noise of less than 30 electrons. The detectors typically have a mean dark current of less than 10 electrons/s at 77 K, with currents below 2 electrons measured at 60 K (both at 0.5 V reverse bias). The mean quantum efficiency is 40 to 60 percent at 77 K for 1.0 to 2.4 microns. Functional pixel yield is typically greater than 99 percent, and the power consumption is approximately 0.2 mW (during readout only).
    Keywords: ASTRONOMY
    Type: NASA, Ames Research Center, Proceedings of the Third Infrared Detector Technology Workshop; p 311-320
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  • 5
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    Laboratory and telescope use of the NICMOS2 128 x 128 HgCdTe array (1989)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The second generation of Hubble Space Telescope (HST) instruments will include a near-infrared instrument. This choice has driven the development of near-infrared arrays to larger sizes and lower read noises. Rockwell International has delivered an array for use in the Near Infrared Camera and Multi-Object Spectrometer (NICMOS) instrument; this array has been dubbed NICMOS2. NICMOS2 is a 128x128 array of HgCdTe diodes In-bonded to a switched MOSFET readout. The readout was specifically designed for astronomical use with the HST requirement of low read noise a prime goal. These arrays use detector material which is similar to that used by Rockwell in previous arrays (e.g., HgCdTe produced on a sapphire substrate), but the NICMOS2 devices differ substantially from other 128x128 arrays produced by Rockwell in having a read noise of only 30 electrons when read out using appropriate correlated sampling. NICMOS2 has now been characterized in the laboratory, and it has been used on groundbased telescopes.
    Keywords: ASTRONOMY
    Type: NASA, Ames Research Center, Proceedings of the Third Infrared Detector Technology Workship; p 321-330
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    NASA TECHNICAL REPORTS
  • 6
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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
  • 7
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    256 x 256 HgCdTe focal plane array for the Hubble Space Telescope (1990)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Infrared Technology and Applications; Jun 26, 1990 - Jun 28, 1990; London
    Format: text
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