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  • 1
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    Testing of 100 mK bolometers for space applications (1996)
    In:  CASI
    Details
    Publication Date: 2004-12-03
    Description: Electrical and optical performance data are presented for a prototype 100 mK spider-web bolometer operating under very low photon backgrounds. These data are compared with the bolometer theory and are used to estimate the expected sensitivity of such a detector used for low background space astronomy. The results demonstrate that the sensitivity and speed of response requirements of the bolometer instruments proposed for these missions can be met by 100 mK spider-web bolometers using neutron transmutation doped germanium as the temperature sensitive element.
    Keywords: Spacecraft Instrumentation
    Type: ; 127-130
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Far-infrared emissivity measurements of reflective surfaces (1996)
    In:  CASI
    Details
    Publication Date: 2004-12-03
    Description: An instrument developed to measure the emissivity of reflective surfaces by comparing the thermal emission of a test sample to that of a reference surface is reported. The instrument can accurately measure the emissivity of mirrors made from lightweight thermally insulating materials such as glass and metallized carbon fiber reinforced plastics. Far infrared measurements at a wavelength of 165 micrometers are reported. The instrument has an absolute accuracy of Delta epsilon = 9 x 10(exp -4) and can reproducibly measure an emissivity of as small as 2 x 10(exp -4) between flat reflective surfaces. The instrument was used to measure mirror samples for balloon-borne and spaceborne experiments. An emissivity of (6.05 +/- 1.24) x 10(exp -3) was measured for gold evaporated on glass, and (6.75 +/- 1.17) x 10(exp -3) for aluminum evaporated on glass.
    Keywords: Spacecraft Instrumentation
    Type: ; 69-72
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Infrared bolometers with silicon nitride micromesh absorbers (1996)
    In:  CASI
    Details
    Publication Date: 2019-08-15
    Description: Sensitive far infrared and millimeter wave bolometers fabricated from a freestanding membrane of low stress silicon nitride are reported. The absorber, consisting of a metallized silicon nitride micromesh thermally isolated by radial legs of silicon nitride, is placed in an integrating cavity to efficiently couple to single mode or multiple mode infrared radiation. This structure provides low heat capacity, low thermal conduction and minimal cross section to energetic particles. A neutron transmutation doped Ge thermister is bump bonded to the center of the device and read out with evaporated Cr-Au leads. The limiting performance of the micromesh absorber is discussed and the recent results obtained from a 300 mK cold stage are summarized.
    Keywords: Spacecraft Instrumentation
    Type: ; 119-122
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Bolometric detector systems for IR and mm-wave space astronomy (1996)
    In:  CASI
    Details
    Publication Date: 2019-08-15
    Description: Recent developments in bolometric detector systems for millimeter and submillimeter wave space astronomy are described. Current technologies meet all the requirements for the high frequency instrument onboard the cosmic background radiation anisotropy satellite/satellite for the measurement of background anisotropies (COBRAS/SAMBA) platform. It is considered that the technologies that are currently being developed will significantly reduce the effective time constant and/or the cooling requirements of bolometric detectors. These technologies lend themselves to the fabrication of the large format arrays required for the Far Infrared and Submillimeter Space Telescope (FIRST). The scientific goals and detector requirements of the COBRAS/SAMBA platform that will use infrared bolometers are reviewed and the baseline detector system is described, including the feed optics, the infrared filters, the cold amplifiers and the warm readout electronics.
    Keywords: Spacecraft Instrumentation
    Type: ; 105-110
    Format: text
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    NASA TECHNICAL REPORTS
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