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  • INSTRUMENTATION AND PHOTOGRAPHY  (1,214)
  • 2020-2024
  • 2010-2014
  • 1980-1984  (420)
  • 1970-1974  (793)
  • 1945-1949  (1)
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  • 1
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    Characteristics and capacities of the NASA Lewis Research Center high precision 6.7- by 6.7-m planar near-field scanner (1984)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: A very precise 6.7- by 6.7-m planar near-field scanner has recently become operational at the NASA Lewis Research Center. The scanner acquires amplitude and phase data at discrete points over a vertical rectangular grid. During the design phase for this scanner, special emphasis was given to the dimensional stability of the structures and the ease of adjustment of the rails that determine the accuracy of the scan plane. A laser measurement system is used for rail alignment and probe positioning. This has resulted in very repeatable horizontal and vertical motion of the probe cart and hence precise positioning in the plane described by the probe tip. The resulting accuracy will support near-field measurements at 60 GHz without corrections. Subsystem design including laser, electronic and mechanical and their performance is described. Summary data are presented on the scan plane flatness and environmental temperature stability. Representative near-field data and calculated far-field test results are presented. Prospective scanner improvements to increase test capability are also discussed.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA-TM-83785 , E-2281 , NAS 1.15:83785 , Meeting of the Antenna Meas. Tech. Assoc.; Oct 02, 1984 - Oct 04, 1984; San Diego, CA; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Calibration and operation of the Faint Object Spectrograph (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The design and basic performance characteristics of the Faint Object Spectrograph (FOS), one of five instruments built for use on the Space Telescope observatory, is summarized briefly. The results of the recently completed instrument-level calibration are presented with special emphasis on issues affecting plans for FOS astronomical observations. Examples include such fundamental characteristics as: limiting magnitudes (system sensitivity and noise figures), spectral coverage and resolution, scattered light properties, and instrumental polarization and modulation efficiencies. Also gated toward intended users, a rather detailed description of FOS operating modes is given. The discussion begins with the difficulties anticipated during target acquisition and their hoped-for resolution. Both the 'normal' spectroscopic operating modes of the FOS and its 'exotic' features (e.g. spectropolarimetric, time-tagged, and time-resolved modes) are presented. The paper concludes with an overview of the activities to assure proper alignment and operation of the FOS within the entire Space Telescope system (orbital and ground-based).
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Instrumentation in astronomy V; Sep 07, 1983 - Sep 09, 1983; London
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    A magnetic monopole detector utilizing superconducting elements (1971)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Electromagnetic device with superconducting elements for magnetic monopole detection in Apollo lunar samples, describing operation principle, amplifier, sample container and transport system
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: ; YAL SOCIETY (
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Space processing payloads for Spacelab (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-01-25
    Description: Discussed are the definitions of facilities which will serve the research needs of a large group of users. These facilities (payloads) are derived by several combinations of items from a large inventory of modular, reusable, research equipment which enables ready response to many flight opportunities. Workable concepts have been prepared and submitted to the Spacelab design activity. These designs permit the flying of either partial or dedicated payloads. The technical integrity of the modular approach to payload design/integration and the utility of commercial-equipment technology are also addressed in this paper.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Proc. of the 3d Space Processing Symp. on Skylab Results, Vol. 2; p 525-564
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Accuracy of relative positioning by interferometry with GPS Double-blind test results (1983)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: MITES (Miniature Interferometer Terminals for Earth Surveying) observations conducted on December 17 and 29, 1980, are analyzed. It is noted that the time span of the observations used on each day was 78 minutes, during which five satellites were always above 20 deg elevation. The observations are analyzed to determine the intersite position vectors by means of the algorithm described by Couselman and Gourevitch (1981). The average of the MITES results from the two days is presented. The rms differences between the two determinations of the components of the three vectors, which were about 65, 92, and 124 m long, were 8 mm for the north, 3 mm for the east, and 6 mm for the vertical. It is concluded that, at least for short distances, relative positioning by interferometry with GPS can be done reliably with subcentimeter accuracy.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Format: text
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  • 6
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    Electron calibration on a high-energy cosmic ray detector. (1973)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The response of the GSFC High Energy Cosmic Ray Detector has been studied using electrons in the energy range from 5.4 to 18 GeV. A semiempirical analytic form has been developed to determine the starting points and the energies of electron-induced cascade showers. The energy resolution thus obtained has a full width at half maximum of 17%, and the starting point can be determined to within 0.1 to 0.2 radiation length. The results of this response calibration provide a basis on which cosmic ray electrons can be reliably identified and analyzed in the presence of a large proton background.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Nuclear Instruments and Methods; 108; 1973
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    NASA TECHNICAL REPORTS
  • 7
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    A graphite crystal polarimeter for stellar X-ray astronomy. (1972)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The first crystal X-ray polarimeter to be used for X-ray astronomy is described. Polarization is measured by modulation of the X rays diffracted at an average 45 deg glancing angle from large, curved graphite crystal panels as these rotate about an axis parallel to the incident X-ray flux. Arrangement of the crystal panels, the design of the detector, and the signal-processing circuitry were optimized to minimize systematic effects produced by off-axis pointing of the rocket and cosmic ray induced events. The in-flight performance of the instrument in relation to the observed background signal is discussed.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Review of Scientific Instruments; 43; July 197
    Format: text
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    NASA TECHNICAL REPORTS
  • 8
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    Electron calibration of a high energy cosmic ray detector (1972)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The spectrum of cosmic ray electrons above 10 GeV was studied extensively. The spectrum is predicted to steepen at an energy which is related to the lifetime of electrons in the interstellar medium against losses due to inverse Compton collisions with photons and to synchrotron radiation in galactic magnetic fields. The experimental results diverge widely; the lack of agreement between the various measurements is due to a variety of experimental problems.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA-TM-X-66049 , X-661-72-329
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 9
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    In-flight absolute radiometric calibration of the Thematic Mapper (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: In order to determine temporal changes of the absolute radiometric calibration of the entire TM system in flight spectroradiometric measurements of the ground and the atmosphere were made simultaneously with TM image collections over the White Sands, NM area. By entering the measured values in an atmospheric radiative transfer program, the radiance levels in four of the spectral bands of the TM were determined, band 1: 0.45 to 0.52 micrometers, band 2: 0.53 to 0.61 micrometers, band 3: 0.62 to 0.70 micrometers, and 4: 0.78 to 0.91 micrometers. These levels were compared to the output digital counts from the detectors that sampled the radiometrically measured ground area, thus providing an absolute radiometric calibration of the entire TM system utilizing those detectors. Previously announced in STAR as N84-15633
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: IEEE Transactions on Geoscience and Remote Sensing (ISSN 0196-2892); GE-22; 251-255
    Format: text
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    NASA TECHNICAL REPORTS
  • 10
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    A detector for high frequency modulation in auroral particle fluxes (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: A high time resolution electron detector has been developed for use in sounding rocket studies of the aurora. The detector is used to look for particle bunching in the range 50 kHz-10 MHz. The design uses an electron multiplier and an onboard frequency spectrum analyzer. By using the onboard analyzer, the data can be transmitted back to ground on a single 93-kHz voltage-controlled oscillator. The detector covers the 50 kHz-10 MHz range six times per second and detects modulation on the order of a new percent of the total electron flux. Spectra are presented for a flight over an auroral arc.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Review of Scientific Instruments; 45; Oct. 197
    Format: text
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