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  • 1
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    Infrared imaging - A validation technique for computational fluid dynamics codes used in STOVL applications (1991)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: The need for a validation technique for computational fluid dynamics (CFD) codes in STOVL applications has led to research efforts to apply infrared thermal imaging techniques to visualize gaseous flow fields. Specifically, a heated, free-jet test facility was constructed. The gaseous flow field of the jet exhaust was characterized using an infrared imaging technique in the 2 to 5.6 micron wavelength band as well as conventional pitot tube and thermocouple methods. These infrared images are compared to computer-generated images using the equations of radiative exchange based on the temperature distribution in the jet exhaust measured with the thermocouple traverses. Temperature and velocity measurement techniques, infrared imaging, and the computer model of the infrared imaging technique are presented and discussed. From the study, it is concluded that infrared imaging techniques coupled with the radiative exchange equations applied to CFD models are a valid method to qualitatively verify CFD codes used in STOVL applications.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: AIAA PAPER 91-0675
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Earth Radiation Budget Experiment scanner radiometric calibration results (1990)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Description: The Earth Radiation Budget Experiment (ERBE) scanning radiometers are producing measurements of the incoming solar, earth/atmosphere-reflected solar, and earth/atmosphere-emitted radiation fields with measurement precisions and absolute accuracies, approaching 1 percent. ERBE uses thermistor bolometers as the detection elements in the narrow-field-of-view scanning radiometers. The scanning radiometers can sense radiation in the shortwave, longwave, and total broadband spectral regions of 0.2 to 5.0, 5.0 to 50.0, and 0.2 to 50.0 micrometers, respectively. Detailed models of the radiometers' response functions were developed in order to design the most suitable calibration techniques. These models guided the design of in-flight calibration procedures as well as the development and characterization of a vacuum-calibration chamber and the blackbody source which provided the absolute basis upon which the total and longwave radiometers were characterized. The flight calibration instrumentation for the narror-field-of-view scanning radiometers is presented and evaluated.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Long-term Monitoring of the Earth''s Radiation Budget; Apr 17, 1990 - Apr 18, 1990; Orlando, FL; United States
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Transient conduction-radiation analysis of an absolute active cavity radiometer using finite elements (1987)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Description: A NASA-developed finite element-based model of a generic active cavity radiometer (ACR) has been developed in order to study the dependence on operating temperature of the closed-loop and open-loop transient response of the instrument. Transient conduction within the sensing element is explored, and the transient temperature distribution resulting from the application of a time-varying radiative boundary condition is calculated. The results verify the prediction that operation of an ACR at cryogenic temperatures results in large gains in frequency response.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: International Symposium on Thermal Problems in Space-Based Systems; Dec 13, 1987 - Dec 18, 1987; Boston, MA; United States
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Analysis of a nonisothermal, spherical detector for monitoring the earth's radiative energy budget. (1972)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Conference on Atmospheric Radiation; Aug 07, 1972 - Aug 09, 1972; Fort Collins, CO
    Format: text
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    NASA TECHNICAL REPORTS
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