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  • Other Sources  (12)
  • INSTRUMENTATION AND PHOTOGRAPHY  (10)
  • SPACECRAFT INSTRUMENTATION  (2)
  • 1
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    Hybrid analog/digital, large format, photon counting detectors for astronomy (1986)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: The development of a new microchannel plate photon-counting detector with an analog readout method based on a resistive anode is reported. This detector exhibits extremely high, stable electron gains of 10 to the 8th. At this gain, the spatial resolution is no longer primarily limited by the noise of the resistive anode, so that digital methods of readout, such as discrete conductors, lose their advantage. These detectors can be readily scaled to 40 mm and 70 mm formats to match plate scales of 2-m (and larger) telescopes. New, high speed digital electronics fully exploit the high spatial and time resolution made possible by gains of this level. Analysis of the theoretical performance of this detector shows that the major limitation to the spatial resolution is the proximity focus of the photocathode and the first microchannel plate. The detector has been mated to an echelle spectrograph developed.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
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    NASA TECHNICAL REPORTS
  • 2
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    High-resolution imaging with a two-dimensional resistive anode photon counter (1982)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: A method to achieve high spatial resolution readout of individual photoelectron events using microchannel plates and a resistive anode is presented. A clamped pair of microchannel plates is used, followed by a gap and a clamped triplet of microchannel plates in cascade to achieve a high stable electron gain of 3 x 10 to the 7th. The gain allows the position determination of each photoelectron event with a very high signal-to-noise ratio. A model consisting of a windowless vacuum-ultraviolet image sensor is presented to demonstrate 500 x 500 pixel images of 50 micron FWHM over a 25-mm circular field of view. The detector offers sufficient speed, sensitivity and resolution for a variety of applications, and the mount design is compatible with planar, remotely-processed, proximity-focused photocathodes.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Review of Scientific Instruments; 53; May 1982
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    NASA TECHNICAL REPORTS
  • 3
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    Continuous discharge Penning source with emission lines between 50 A and 300 A (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The present paper deals with a modified Penning discharge lamp developed specially to cover the soft X-ray and extreme UV spectral regions. The source produces a total of nearly 40 intense lines in the 50 to 300 A range. The lamp is quiet, continuous, and stable over most of the cathode lifetime (which is sufficient for long calibration runs). When the cathodes become exhausted, the refurbishment procedure is so simple that the source can be back on line in an hour or less
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Applied Optics; 18; Mar. 1
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    NASA TECHNICAL REPORTS
  • 4
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    Channel electron multiplier - Its quantum efficiency at soft X-ray and vacuum ultraviolet wavelengths (1976)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Applied Optics; 15; Apr. 197
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  • 5
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    Large area extreme ultraviolet focusing collector (1975)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: A grazing incidence one-dimensional focusing collector for use in the extreme ultraviolet is described. The collector has a field of view of 1 x 50 deg, a focal length of 3015 cm, and a total unobstructed area of 224 sq cm. The instrument employs an interchangeable detector package of either channel-electron multipliers or proportional counters which yield a limiting sensitivity of 1.0 photons/sq cm sec A at 170 A and 0.05 photons/sq cm sec A at 90 A, respectively, for one second integrations. The design and calibration of the instrument are described in detail. Data obtained by this instrument during recent rocket flights are presented.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Review of Scientific Instruments; 46; Apr. 197
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  • 6
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    Quantum efficiency of a channel electron multiplier in the far ultraviolet (1975)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: Variation of the quantum efficiency of a channel electron multiplier (CEM) in the wavelength range from 1200 to 2536 A is studied. Emphasis is on measurement of CEM sensitivity longward of 1500 A. Results indicate an overall rapid decrease in quantum efficiency with increasing wavelength, with little evidence for a possible change in slope in the range from 2000 to 2500 A. The lowest efficiency measured is 4.5 + or -2.5 times 10 to the minus ninth count/photon at 2536 A. These efficiencies should ensure that unwanted radiation longward of 1500 A can be effectively removed from the bandpass of the instrument.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Applied Optics; 14; Dec. 197
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  • 7
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    Extreme ultraviolet spectrometer for space research (1974)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: A normal incidence spectrometer for use in the wavelength region from 200 to 1270 A has been developed. The design and calibration of the instrument are described in detail. The spectrometer can be employed to detect extreme UV radiation at a minimum flux level of 1 rayleigh with a spectral resolution of 40 A and a spatial resolution of 6 deg. Data on the extreme UV night sky spectrum between 780 and 1270 A obtained with this instrument on a recent rocket flight are presented.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Applied Optics; 13; Mar. 197
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  • 8
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    A far ultraviolet photometer for space research (1970)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: Far UV photometer for space research, isolating specific bands by combining spectral response of individual solar blind photocathodes with thin metallic films transmission qualities
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: ; STITUTION OF ENGINEE
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    NASA TECHNICAL REPORTS
  • 9
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    Gas absorption cell photometer for rocket observations of local interstellar helium (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: A photometer sensitive in the 584-A line of He I, incorporating a helium-gas absorption cell, has been developed. The helium is confined at a pressure of 0.2 torr between thin-metal-foil broad-band ultraviolet filters. The cell contains sufficient helium to absorb 584-A radiation scattered from atmospheric helium. The ratio of fluxes seen with the cell full and empty provides a valuable datum for fitting models of the local interstellar medium, which is independent of solar 584-A flux, interstellar helium density, and photometer sensitivity.-
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Review of Scientific Instruments; 47; Mar. 197
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  • 10
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    Long term variability of transmission of thin In-Sn and Sn-C films for EUV instrumentation (1982)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The transmission variability is reported for two filters in the EUV, where the filters were supported on an 80% transmission nickel mesh and fabricated by means of a vacuum deposition technique. The first film consisted of 2500 A-thick indium, deposited on 500 A-thick tin, and had its primary bandpass in the 740-960 A range. The second consisted of 1800 A-thick tin and 2000 A-thick carbon, with a bandpass of 500-750 A. At the end of 10 months, the transmission of both filters was measured to check variations. It is demonstrated that the EUV transmission of such filters can change over the typical lifetime of satellite missions, and that such variation depends on the storage environment. The use of vacuum, rather than dry nitrogen storage is recommended.
    Keywords: SPACECRAFT INSTRUMENTATION
    Type: Applied Optics; 21; Oct. 1
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