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  • INSTRUMENTATION AND PHOTOGRAPHY  (45)
  • Life Sciences (General)
  • 1995-1999
  • 1980-1984
  • 1975-1979  (45)
  • 1977  (45)
  • 1
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    Recent developments in parallel-grid, gas-scintillation proportional counters (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The problems of developing large-area, gas-scintillation proportional counters with high resolution are considered. It is found that simple large-area, parallel-grid proportional counters suffer from a variation in gain over the counter window. Some success has been achieved in overcoming this problem by focusing the charge cloud as it drifts into the multiplication region. Measurements are reported for various mixtures of argon and xenon as well as pure xenon.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
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    NASA TECHNICAL REPORTS
  • 2
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    Spectral radiance calibrations between 165-300 nm - An interlaboratory comparison (1977)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: The spectral radiance of deuterium lamps calibrated by the Max-Planck-Institut fuer Astronomie (MPI), by the U.S. National Bureau of Standards (NBS), and by the Physikalisch-Technische Bundesanstalt (PTB) are compared to check the agreement of UV radiometric scales. The NBS group used the optically thin continuum radiation from a wall-stabilized hydrogen arc as its fundamental radiometric standard, while the MPI and PTB groups used the synchrotron radiation facility in DESY. It is found that the spectral radiance scales based upon the DESY synchrotron and the NBS hydrogen arc are consistent, at least for one wavelength relative to another.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Applied Optics; 16; July 197
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    NASA TECHNICAL REPORTS
  • 3
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    Digital processing of the Mariner 10 images of Venus and Mercury (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: An extensive effort was devoted to the digital processing of the Mariner 10 images of Venus and Mercury at the Image Processing Laboratory of the Jet Propulsion Laboratory. This effort was designed to optimize the display of the considerable quantity of information contained in the images. Several image restoration, enhancement, and transformation procedures were applied; examples of these techniques are included. A particular task was the construction of large mosaics which characterize the surface of Mercury and the atmospheric structure of Venus.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Journal of Applied Photographic Engineering; 3; Spring 1
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Development of a drive system for a sequential space camera contract modification 4(S) (1977)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The brush type dc motor and clutch were eliminated from the design of the 16 mm space sequential camera design and replaced by an electronically commutated motor. The new drive system reduces the current consumption at 24 fps to 220 mA. The drive can be programmed and controlled externally from the multipurpose programmable timer/intervalometer, as well as being controlled locally from the camera.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA-CR-151342 , SPO-30352
    Format: application/pdf
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  • 5
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    DSN water vapor radiometer development: Recent work (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A water vapor radiometer (WVR) was developed which measures the atmospheric noise temperature at two different frequencies. These noise temperatures are used in empirical-theoretical equations which yield tropospheric range delay, in centimeters, through the atmosphere along the beam of the WVR. This range correction is then applied to measurements concerning spacecraft range and to very long baseline interferometry determinations.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: The Deep Space Network; p 71-75
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  • 6
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    Galatry profile convolved with the Fabry-Perot instrument function (1977)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: The physical conditions in laboratory gases and in the upper atmosphere of the planets, including earth, can be deduced from a measurement of the intensity and line profile of different radiating molecules. Because of the low pressures in the upper atmospheres, many molecular lines with small pressure-broadening coefficients are collisionally narrowed. These lines are resolvable with a Fabry-Perot interferometer. Analytical expressions are given relating the measured line intensity and profile to the true line intensity and profile. A deconvolution of the measured profile gives the parameters A, beta, and K characterizing the collisionally narrowed Galatry profile. General expressions for the nonideal interferometer are discussed, and, specifically, mirror defects and a limited detector aperture are treated.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Applied Optics; 16; June 197
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  • 7
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    Quasi-microscope concept for planetary missions (1977)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: Viking lander cameras have returned stereo and multispectral views of the Martian surface with a resolution that approaches 2 mm/lp in the near field. A two-orders-of-magnitude increase in resolution could be obtained for collected surface samples by augmenting these cameras with auxiliary optics that would neither impose special camera design requirements nor limit the cameras field of view of the terrain. Quasi-microscope images would provide valuable data on the physical and chemical characteristics of planetary regoliths.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Applied Optics; 16; Sept
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  • 8
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    Digital high density (80 Mb/s) tape (1977)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: Work with a state-of-the-art high density PCM tape recorder reproducer system is described. The tape recorder is designed for 80 Mb/s operation at an overall bit error rate of .00001and for 40 Mb/s operation at .000001. The article describes the process of measuring the error rate. Also detailed is a data rate buffer designed for use in recent radar experiments and generalizable to most potential uses of the recorder system.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: The Deep Space Network; p 110-118
    Format: text
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    NASA TECHNICAL REPORTS
  • 9
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    Instrumental sensing of stationary source emissions (1977)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: A variety of programs have been conducted within EPA to evaluate the capability of various ground-based remote-sensing techniques for measuring the SO2 concentration, velocity, and opacity of effluents from coal-burning power plants. The results of the remote measurements were compared with the results of instack measurements made using EPA reference methods. Attention is given to infrared gas-filter correlation radiometry for SO2 concentration, Fourier-transform infrared spectroscopy for SO2 concentration, ultraviolet matched-filter correlation spectroscopy for SO2 concentration, infrared and ultraviolet television for velocity and SO2 concentration, infrared laser-Doppler velocimetry for plume velocity, and visible laser radar for plume opacity.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Environmental Science and Technology; 11; Oct. 197
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    NASA TECHNICAL REPORTS
  • 10
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    Primary aberrations for grazing incidence (1977)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: Beginning with exact relations between object and image coordinates for a single reflective surface, a systematic analysis of general grazing incidence systems is presented. A complete set of primary aberrations for single-element and two-element systems is developed. The importance of a judicious choice for a coordinate system in showing field curvature to be clearly the predominant aberration for a two-element system is discussed. The validity of the theory is verified through comparisons with the exact ray-trace results for the case of a telescope.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Applied Optics; 16; Sept
    Format: text
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