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  • INSTRUMENTATION AND PHOTOGRAPHY
  • Physics
  • SPACE VEHICLES
  • 1985-1989  (1,903)
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Publisher
Years
Year
  • 1
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    The solar vector magnetograph of the Okayama Astrophysical Observatory (1985)
    In:  CASI
    Details
    Publication Date: 2009-11-16
    Description: The vector magnetograph of the Okayama Astrophysical Observatory is fed to the 65 cm solar coude telescope with a 10 m Littrow spectrograph. The polarimeter put at the telescope focus analyzes the incident polarization. Photomultipliers (PMT) at the exit of the spectrograph pick up the modulated light signals and send them to the electronic controller. The controller analyzes frequency and phase of the signal. The analyzer of the polarimeter is a combination of a single wave plate rotating at 40 Hz and a Wallaston prism. Incident linear and circular polarizations are modified at four times and twice the rotation frequency, respectively. Two compensators minimize the instrumental polarization, mainly caused by the two tilt mirrors in the optical path of the telescope. The four photomultipliers placed on the wings of the FeI 5250A line give maps of intensity, longitudinal field and transverse field. The main outputs, maps of intensity, and net linear and circular polarizations in the neighboring continuum are obtained by the other two monitor PMTs.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA. Marshall Space Flight Center Meas. of Solar Vector Magnetic Fields; p 173-182
    Format: text
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  • 2
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    Halogen lamp experiment, HALEX (1986)
    In:  CASI
    Details
    Publication Date: 2006-06-12
    Description: The main purpose of the Halogen Lamp Experiment (HALEX) was to investigate the operation of a halogen lamp during an extended period in a microgravity environment and to prove its behavior in space. The Mirror Heating Facilities for Crystal Growth and Material Science Experiments in space relies on one or two halogen lamps as a furnace to melt the specimens. The HALEX aim is to verify: full power operation of a halogen lamp for a period of about 60 hours; achievement of about 10% of its terrestrial life span; and operation of the halogen lamp under conditions similar to furnace operation.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA. Goddard Space Flight Center The 1985 Get Away Special Experimenter's Symposium; p 141-149
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  • 3
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    Design considerations for a gas microcontroller (1986)
    In:  CASI
    Details
    Publication Date: 2006-06-12
    Description: Some of the design problems that are now being addressed in consideration of a microcontroller for the upcoming GAS payload are discussed. Microcontrollers will be used to run the experiments and to collect and store the data from those experiments. Some of the requirements for a microcontroller are to be small, lightweight, have low power consumption, and high reliability. Some of the solutions that were developed to meet these design requirements are discussed. At present, the experiment is still in the design stage and the final design may change from what is presented here. The search for new integrated circuits which will do all that is needed all in one package continues.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA. Goddard Space Flight Center The 1985 Get Away Special Experimenter's Symposium; p 117-124
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  • 4
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    Sparsely-sampled phase-insensitive two-dimensional arrays: Spatial interpolation and signal-dependent aperture (1987)
    In:  CASI
    Details
    Publication Date: 2004-10-30
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NDE at NASA Langley. Advancing the State-of-the-Art and Providing a Quantitative Science Base for Materials Characterization; 10 p
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  • 5
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    Evaluation and characterization of hybrid arrays (1986)
    In:  CASI
    Details
    Publication Date: 2006-02-14
    Description: An Infrared Camera was built for astronomical observations and for testing arrays for satellite based work. The detectors are sensitive to mid infrared wavelengths. The camera was tested at the University of Arizona 61 and 90 inch telescopes and the NASA IRTF. These tests have demonstrated a sensitivity consistent with photon shot noise with an approximately 10% quantum efficiency for each pixel when the camera was used with a 1.6% spectral filter or when used with a Fabry-Perot having a resolving power of 2000. Initial measurements of read out noise, dark current, cross talk, and hysteresis were made. The detector chip in current use is a hybrid array manufactured by the Hughes Aircraft Company. Because part of the goal was to develop and advance technology, it was decided to work with a switched MOSFET array. This architecture is very promising, and the detector parameters will be quantified carefully.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA. Ames Research Center Proceedings of the Second Infrared Detector Technology Workshop; 22 p
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  • 6
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    Evaluation of a Si:Ga direct readout array (1986)
    In:  CASI
    Details
    Publication Date: 2006-02-14
    Description: Preliminary results from the Hughes 58 x 62 gallium-doped silicon infrared array are presented. The device functioned predictably and repeatedly at the low temperatures for the Space Infrared Telescope Facility (SIRTF). Power dissipation was reduced to acceptable levels while still maintaining the device speed. The infrared response was excellent and the degree of anomalous effects was compatible to conventional photoconductors.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA. Ames Research Center Proceedings of the Second Infrared Detector Technology Workshop; 16 p
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  • 7
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    Development of 58 x 62 Si:Sb detector arrays (1986)
    In:  CASI
    Details
    Publication Date: 2006-02-14
    Description: The fabrication of antimony doped silicon (Si:Sb) detector arrays are described for use in 30 micron infrared imaging applications. The operation of the multiplexer readout circuit which will be used for this application is also described.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA. Ames Research Center Proceedings of the Second Infrared Detector Technology Workshop; 6 p
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  • 8
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    Preliminary test data using the MOS DRO with Si:In detector material (1986)
    In:  CASI
    Details
    Publication Date: 2006-02-14
    Description: The initial testing performed on the Hughes Metal Oxide Semiconductor Direct Readout (MOS DRO) with a Si:In extrinsic infrared array is described. The testing to date was of a screening nature and the results are primarily qualitative rather than quantitative. At a later date the performance optimization phase will be initiated. An encouraging result is that this response is strongly dependent on the detector temperature, to the extent that thermal transients introduced during the chip readout will affect the performance. A responsivity of 1 A/W at 2.2 microns with a bias of 15 volts, which is well below what is optimum bias, was obtained.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA. Ames Research Center Proceedings of the Second Infrared Detector Technology Workshop; 12 p
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  • 9
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    Imagery with a Si:Bi 16 x 16 array (1986)
    In:  CASI
    Details
    Publication Date: 2006-02-14
    Description: A description of the design and performance of an imaging spectrometer intended for operation in the 7 to 14 micron wavelength range is presented. It is based upon a 16 by 16 element Si:Bi hybrid array, a circular variable filter wheel, and a microcomputer data acquisition system. The spatial-spectral photometric performances were evaluated in the laboratory as well as field tested at astronomical observatories. The performance characteristics of the system are presented as well as laboratory and astronomical images.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Proceedings of the Second Infrared Detector Technology Workshop; 14 p
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  • 10
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    A study of Si:In hybrid surface channel IRCCD devices (1986)
    In:  CASI
    Details
    Publication Date: 2006-02-14
    Description: Hybrid silicon Infrared Charge Coupled Devices (IRCCDs) are evaluated for use as viable astronomical detectors. A Si:In photoconductor array which is bump-bonded to a silicon multiplexer is described. A summary of the device parameters is given.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA. Ames Research Center Proceedings of the Second Infrared Detector Technology Workshop; 16 p
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