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  • 1
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    X-ray and gamma-ray imaging with multiple-pinhole cameras using a posteriori image synthesis. (1972)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: In 1968, Dicke had suggested that multiple-pinhole camera systems would have significant advantages concerning the SNR in X-ray and gamma-ray astronomy if the multiple images could be somehow synthesized into a single image. The practical development of an image-synthesis method based on these suggestions is discussed. A formulation of the SNR gain theory which is particularly suited for dealing with the proposal by Dicke is considered. It is found that the SNR gain is by no means uniform in all X-ray astronomy applications.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Applied Optics; 11; Apr. 197
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Electrical and acoustical resonances of vibrators (1973)
    In:  CASI
    Details
    Publication Date: 2006-03-28
    Description: The basic sources of vibration in electrical machines are identified as: (1) unbalanced masses of the rotor, (2) condition of the bearings, and (3) the electromagnetic field gap. Methods for improving the vibration characteristics of electrical machines are proposed. A mathematical model is developed for calculating the damping elements located between the bearings and the mounts.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Cybernetic Diagnostics of Mech. Systems with Vibro-acoustic Phenomena (NASA-TT-F-14899); p 235-238
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Liquid-filled proportional counter (1971)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Liquid Xe filled single wire proportional and multiple wire ionization chambers, measuring gain and time/spatial resolution properties
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: ; 29 (
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Electronic systems for the new multichannel spectrometer at Sacramento Peak. (1972)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Description of the design features and operation of a new multichannel solar spectrometer to be used for ground-based observations of active regions whose X-ray and EUV emissions are studied by the OSO-H and other satellites. The electronic systems associated with the instrument include (1) an electrooptical guider controlled by a punched paper tape capable of making raster scans of selected portions of the solar disk, (2) a programmer unit that applies paper-tape commands to various portions of the instrument, (3) a closed-loop servosystem for the vacuum heliostat, (4) stepping motor controls for spectral scans, (5) a 40-channel photomultiplier readout, and (6) a magnetometer. Preliminary solar observations indicate satisfactory performance of the system.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Infrared radiometry experiment for Mariner Mars 1971 (1970)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: IR radiometer for Mariner Mars 1971 project providing surface brightness temperatures
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: ; YAL SOCIETY (
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    NASA TECHNICAL REPORTS
  • 6
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    A directional low energy gamma-ray detector (1973)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: The sensitivity of a directional gamma ray detector, which relies on blocking a source to determine its direction and energy spectrum, is calculated and compared to the more conventional well shaped shielded detectors. It is shown that such an anticollimator detection system provides a basis for measuring the celestial diffuse gamma ray background, gamma ray sources and bursts with good energy, angular, and time resolution, and that additionally the system is 20 to 50 times as sensitive as conventional detectors when compared on a per unit mass basis.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA. Goddard Space Flight Center Goddard Contrib. to the Los Alamos Conf. on Transient Cosmic Gamma and X-ray Sources; 28 p
    Format: text
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    NASA TECHNICAL REPORTS
  • 7
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    A portable self-contained gas chromatograph. (1972)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: The design and fabrication of a completely portable, self-contained gas chromatograph is described. This instrument utilizes a closed-loop hydrogen carrier gas flow as maintained by a hydrogen generator-separator. It employs an auxiliary hydrogen generator to keep a positive flow of hydrogen through the detector. The detector is an ionization cross section detector. The only maintenance required is the addition of water (5-15 cc/day) to the auxiliary hydrogen generator. Lower limit of detection for the present system is of the order of 1-10 ppm ethane.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Review of Scientific Instruments; 43; Oct. 197
    Format: text
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    NASA TECHNICAL REPORTS
  • 8
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    The S-193 radar altimeter experiment (1974)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: The Skylab S-193 altimeter experiment utilizes a 10- and 100-ns pulse length, 13.9-GHz earth-pointed radar system to obtain earth-surface backscatter measurements from the Skylab spacecraft. Objectives of the experiment are to obtain precision measurements of surface profile for uses in geodesy, oceanography, and earth physics, and to measure radar-signal characteristics from an earth-orbit geometry to provide design information for future radar remote-sensors. The technical approach is that of measuring the power impulse response of the scattering surface. The hardware is designed to operate in five modes: waveform or impulse-response measurement and altitude determination; radar cross-section experiment; signal correlation experiment; 10-nsec pulse-compression evaluation; and nadir-seeker experiment.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: IEEE; vol. 62
    Format: text
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  • 9
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    A liquid xenon radioisotope camera. (1972)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: A new type of gamma-ray camera is discussed that makes use of electron avalanches in liquid xenon and is currently under development. It is shown that such a radioisotope camera promises many advantages over any other existing gamma-ray cameras. Spatial resolution better than 1 mm and counting rates higher than one million C/sec are possible. An energy resolution of 11% FWHM has recently been achieved with a collimated Hg-203 source using a parallel-plate ionization chamber containing a Frisch grid.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Format: text
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    NASA TECHNICAL REPORTS
  • 10
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    Remote sensing of ocean color from aircraft (1970)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Over 3000 ocean spectra of sunlight backscattered from the upper layers of the sea have been obtained at flight altitudes to 10,000 feet together with detailed ground truth. These spectra are from stations which include a wide range of water masses differing as to biological and physical condition. This data bank and the analysis already performed demonstrates the probable feasibility of using ocean color as a parameter to locate areas of special significance to physical oceanographers and marine biologists from aircraft and satellites.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: 3d Ann. Earth Resources Program Rev., Vol. 3; 12 p
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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