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  • 1
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    Modulated infrared radiant source (1981)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A modulated, infrared radiant energy source was developed to calibrate an airborne nadir-viewing pressure modulated radiometer to be used to detect from Earth orbit trace gases in the troposphere. The technique used an 8 cm long, 0.005 cm diameter platinum-iridium wire as an isothermal, thin line radiant energy source maintained at 1200 K. A + or - 20 K signal, oscillating at controllable frequencies from dc to 20 Hz, was superimposed on it. This periodic variation of the line source energy was used to verify the pressure modulated radiometer's capability to distinguish between the signal variations caused by the Earth's background surface and the signal from the atmospheric gases of interest.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA-TM-83118 , L-14365
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    A calibration technique for a hot-wire-probe vector anemometer (1982)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Calibration tests using hot wires were conducted using a newly developed test rig that greatly reduced the data acquisition time. A comparison of measured and computed velocity vector magnitude and direction indicates the necessity of complete probe calibration to determine flow interference and/or operating limitation regions. Calibration results indicate that flow rates with 3 percent accuracy and flow angles with 5 deg accuracy are attainable.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA-TM-83254 , NAS 1.15:83254 , L-14445
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Dynamic calibration of flowmeter (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Technique for flowmeters has been developed and tested whereby fluid flows through meter at constant velocity while flowmeter is forced to oscillate relative to fluid.
    Keywords: MECHANICS
    Type: LAR-12023 , NASA Tech Briefs (ISSN 0145-319X); 2; 1; P. 3
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Calibration target for temperature radiometer (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Technique measures temperature/voltage drop characteristics of very thin filament. With constant current running through filament, voltage drop is recorded at various temperatures, as measured by calibrated thermocouple.
    Keywords: MECHANICS
    Type: LAR-12239 , NASA Tech Briefs (ISSN 0145-319X); 3; 1; P. 89
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    A hot wire radiant energy source for mapping the field of view of a radiometer (1977)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The design and performance of a calibration device that allows the measurement of a radiometer's field of view are described. The heart of the device is a heated 0.0254-mm (0.001-inch) diameter filament that provides a variable, isothermal line source of radiant energy against a cold background. By moving this discrete line source across the field of view of a radiometer, the radiometer's spatial response can be completely mapped. The use of a platinum filament provides a durable radiation source whose temperature is stable and repeatable to 10 K over the range of 600 to 1200 K. By varying the energy emitted by the filament, the field of view of radiometers with different sensitivities (or multiple channel radiometers) can be totally mapped.
    Keywords: RESEARCH AND SUPPORT FACILITIES (AIR)
    Type: NASA-TM-74035
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    Hyperbola-generator for location of aperiodic events (1970)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Plotting device, when used in conjunction with three or more detectors and local receiver and recorder, can quickly pinpoint location of any aperiodic event. Operation requires minimal training and is readily adapted to the field. Mechanical error in device prototype is less than or equal to 3 percent.
    Keywords: MECHANICS
    Type: LAR-10312
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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