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  • INSTRUMENTATION AND PHOTOGRAPHY  (5)
  • 1980-1984  (5)
  • 1970-1974
  • 1930-1934
  • 1
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    Nuclear Science Symposium, 29th, and Symposium on Nuclear Power, 14th, Washington, DC, October 20-22, 1982, Proceedings (1983)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: High-energy radiation detectors suitable for balloon-borne or space-based radiation event studies are described. The employment of NaI(Tl) scintillator bars for gamma ray detection is outlined, and the development of a fluorescent gated gas-filled scintillation proportional counter is reported. A high throughput nondispersive hard X ray spectrograph with angular resolution for cosmic bursts, transients, and sources has been constructed. Features of a sealed high pressure xenon filled imaging proportional counter with a 30 sq cm sensitive area are explored. Finally, the various radiation effects on electronic circuitry in a space environment are defined, and an MOS dosimeter for assaying the cumulative radiation flux in a spacecraft due to ambient conditions is characterized.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Portable dynamic pressure generator for static and dynamic calibration of in situ pressure transducers (1983)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A portable dynamic pressure generator was developed to meet the requirements of determining the dynamic sensitivities of in situ pressure transducers at low frequencies. The device is designed to operate in a frequency range of 0 to 100 Hz, although it was only tested up to 30 Hz, and to generate dynamic pressures up to 13.8 kPa (2 psi). A description of the operating characteristics and instrumentation used for pressure, frequency, and displacement measurements is given. The pressure generator was used to statically and dynamically calibrate transducers. Test results demonstrated that a difference an exist between the static and dynamic sensitivity of a transducer, confirming the need for dynamic calibrations of in situ pressure transducers.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA-TM-85687 , NAS 1.15:85687
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Proposed fast-response oxygen monitoring and control system for the Langley 8-foot high-temperature tunnel (1983)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A fast-response oxygen monitoring and control system, based on a Y2O3-stabilized ZrO2 sensor, was developed and tested in the laboratory. The system is capable of maintaining oxygen concentration in the CH4-O2-air combustion product gases at 20.9 + or - 1.0 percent. If the oxygen concentration in the exhaust stream differs from that in normal air by 25 percent or more, an alarm signal is provided for automatic tunnel shutdown. The overall prototype system response time was reduced from about 1 sec in the original configuration to about 0.2 sec. The basis of operation and the results of laboratory tests of the system are described.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA-TP-2218 , L-15666 , NAS 1.60:2218
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Development of a nuclear technique for monitoring water levels in pressurized vehicles (1983)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A new technique for monitoring water levels in pressurized stainless steel cylinders was developed. It is based on differences in attenuation coefficients of water and air for Cs137 (662 keV) gamma rays. Experimentally observed gamma ray counting rates with and without water in model reservoir cylinder were compared with corresponding calculated values for two different gamma ray detection theshold energies. Calculated values include the effects of multiple scattering and attendant gamma ray energy reductions. The agreement between the measured and calculated values is reasonably good. Computer programs for calculating angular and spectral distributions of scattered radition in various media are included.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA-TM-85651 , L-15642 , NAS 1.15:85651
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    Characterization of particles in the Langley 0.3 meter transonic cryogenic tunnel using hot wire anemometry (1982)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Hot wire anemometry was used to identify the nature of particles reportedly observed during free stream velocity measurements in the Langley 0.3-meter transonic cryogenic tunnel using a Laser Doppler Velocimeter. Since the heat-transfer process from the hot wire depends on the thermal conductivity and sticking capability of the particles, it was anticipated that the hot wire anemometer response would be affected differently upon impaction by liquid droplets and solid aerosols in the test gas stream. Based on the measured time response of the hot-wire anemometer in the cryogenic tunnel operated in the 0.3-0.8 Mach number range, it is concluded that the particles impacting the hot wire are liquid in nature rather than solid aerosols. It is further surmised that the liquid aerosols are unevaporated liquid nitrogen droplets used for cooling the tunnel test gas.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA-TM-84551 , NAS 1.15:84551
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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