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  • Other Sources  (51)
  • INSTRUMENTATION AND PHOTOGRAPHY  (51)
  • Analytical Chemistry and Spectroscopy
  • Polymer and Materials Science
  • 1980-1984  (51)
  • 1981  (51)
  • 1
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    Low-power portable geophysical data acquisition system and its use in geomagnetic measurements (1981)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: A low-power portable data acquisition system presently in use for geomagnetic measurements is described. The system is composed of a data-processing system containing a low-power microprocessor, a 9-track digital tape recorder, and a rechargeable battery pack. The magnetometer is a low-power three axis fluxgate design. Under program control the data processing system keeps track of time of day and date, samples three analog magnetometer outputs at intervals of either 0.4 or 2 s, digitizes the data to 15-bit resolution, and, depending upon relative magnetic activity, decides upon data compression to increase the tape storage capacity. It also monitors and records internal voltages and provides self-checking functions which may be monitored through a visual readout on the control panel. The system is mounted in a rugged, weather-tight carrying case suitable for use outdoors with minimal protection. The system, including magnetometer, uses 1.6-W power and can store 5.7 Mbytes of data.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: IEEE Transactions on Geoscience and Remote Sensing; GE-19; July 198
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Multichannel scanning radiometer for remote sensing cloud physical parameters (1981)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: A multichannel scanning radiometer developed for remote observation of cloud physical properties is described. Consisting of six channels in the near infrared and one channel in the thermal infrared, the instrument can observe cloud physical parameters such as optical thickness, thermodynamic phase, cloud top altitude, and cloud top temperature. Measurement accuracy is quantified through flight tests on the NASA CV-990 and the NASA WB-57F, and is found to be limited by the harsh environment of the aircraft at flight altitude. The electronics, data system, and calibration of the instrument are also discussed.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Review of Scientific Instruments; 52; Oct. 198
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Vacuum ultraviolet Mach-Zehnder interferometer with CaF2 optics (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: CaF2 beam splitters and compensation and test cell windows have been installed in a VUV Mach-Zehnder interferometer. Results of an evaluation of their performance in the VUV, namely, a measurement of the oscillator strength (f value) of the resonance transition at atomic xenon at 146.9610 nm are reported.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Applied Optics; 20; Feb. 15
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Containerless high temperature calorimeter apparatus (1981)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A calorimeter apparatus for measuring high temperature thermophysical properties of materials is disclosed which includes a containerless heating apparatus in which the specimen is suspended and heated by electron bombardment.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Format: application/pdf
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  • 5
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    A hard X ray and soft gamma ray telescope spectrometer (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-07-27
    Description: A telescope spectrometer in the hard X-ray and soft gamma-ray region from 30 keV to 200 keV can provide significant information in investigations related to solar physics and planetary science. The present study is concerned with the preliminary design of such an instrument, taking into account a use of the Low Intensity X-ray Imaging Scope (Lixiscope). In the design of the considered telescope spectrometer, attention would have to be given to three major components, including the X-ray and gamma-ray input optics, an imaging detector-spectrometer, and an output processor. The preliminary results provided by the present study indicate that, in principle, a complete hard X-ray and soft gamma-ray telescope imaging spectrometer system using the Lixiscope is feasible. However, much work remains to be done with respect to the optimization and improvement of the system for future flight applications.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: In: Imaging spectroscopy; February 10, 11, 1981; Los Angeles, CA
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  • 6
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    A high resolution, field portable spectrometer (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The design of a high resolution, field portable spectrometer system is presented. The system provides the spectral resolution previously available only with laboratory based systems. The system's portability allows for essential in situ measurements, provides rapid acquisition and calibration of spectral reflectance data over a wavelength band from about 300 to 1000 nm. Features include a calibration scheme for normalizing data to the incident radiation, and the injection of a spectral calibration signal. Laboratory tests indicate that the system will perform as expected, and plans are being made to integrate the system with a ground based active and passive microwave data acquisition system.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: In: International Symposium on Remote Sensing of Environment; May 11, 1981 - May 15, 1981; Ann Arbor, MI
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    NASA TECHNICAL REPORTS
  • 7
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    Technical issues in focal plane development for terrestrial resource observations (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Performance goals for solid-state detector arrays operating in the pushbroom scan mode for the high-resolution, high-accuracy remote sensing of earth resources from space are discussed and some of the focal plane and system trades involved are identified. Issues in the development of solid-state pushbroom arrays with radiometric calibration to 0.5% precision detector-to-detector over a dynamic range of 1000:1 are considered, with calibration, temporal stability and spectral response conditions noted. Factors influencing the geometric precision of satellite-borne pushbroom scan mode sensors are then examined, including satellite orbit track and attitude errors, and geometric and radiometric correlation between information in the various spectral bands. Approaches to the alignment of linear arrays of thousands of detectors are then discussed that take into account tradeoffs between fabrication and test complexity and ground processing requirements. Continuing science experiments are indicated as necessary to establish tolerances on performance goals.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Technical issues in focal plane development; Apr 21, 1981 - Apr 22, 1981; Washington, DC
    Format: text
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    NASA TECHNICAL REPORTS
  • 8
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    Image processing and analysis of Saturn's rings (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Processing of Voyager image data of Saturn's rings at JPL's Image Processing Laboratory is described. A software system to navigate the flight images, facilitate feature tracking, and to project the rings has been developed. This system has been used to make measurements of ring radii and to measure the velocities of the spoke features in the B-Ring. A projected ring movie to study the development of these spoke features has been generated. Finally, processing to facilitate comparison of the photometric properties of Saturn's rings at various phase angles is described.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Processing of images and data from optical sensors; Aug 25, 1981 - Aug 26, 1981; San Diego, CA
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    NASA TECHNICAL REPORTS
  • 9
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    Performance of room temperature mercuric iodide /HgI2/ detectors in the ultralow-energy X-ray region (1981)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: Experiments have been done to study the performance of mercuric iodide (HgI2) detectors in the ultralow-energy X-ray region. Energy resolution values of 245 eV (FWHM) for the Mg K-alpha X-ray line at 1.25 keV and 225 eV (FWHM) for the electronic noise linewidth have been obtained for an HgI2 detector with painted carbon contacts using a pulsed-light feedback preamplifier; the whole system was operated at room temperature. The resolution values in the ultralow-energy region are still limited by electronic noise of the system. In an attempt to minimize X-ray attenuation in the front contact, detectors were prepared with thin evaporated Pd contacts. These detectors show a pronounced low-energy tailing of the photopeak below a few keV, in contrast to the spectra obtained by detectors with carbon contact. An attempt has been made to explain the tailing effect starting with models wich have been proposed to describe similar effects in Ge detectors.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Format: text
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  • 10
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    Apparatus for high-pressure and low-temperature experiments (1981)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: A new type of apparatus for high-pressure experiments at low temperature (1.5 K) is presented. It uses a flat diamond anvil with a spherical indentor. It utilizes a load ring placed under the sample, so that the load (and hence pressure) can be measured in situ at low temperature. The apparatus was successfully used to investigate the high-conductivity state of sulphur. It can be used to investigate other thin film samples.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Review of Scientific Instruments; 52; Feb. 198
    Format: text
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