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  • 1
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    Laser anemometry for hot section applications (1983)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Laser anemometers (LA's) for use in the study of the hot section components of turbomachinery are being developed. Specifically, laser anemometers are being developed for use in the 50.8-cm (20-in.) diameter warm turbine and high-pressure turbine (HPT) facilities at Lewis. A brief review of the status of the program along with some preliminary data taken in an open-jet burner are presented.
    Keywords: LASERS AND MASERS
    Type: Turbine Eng. Hot Sect. Tec; Turbine Eng. Hot Sec
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Laser anemometers of hot-section applications (1984)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Laser anemometers are being developed for use in the turbine facilities at Lewis that are involved in the Turbine Engine Hot Section Technology Program. The status of the program is given along with some results accomplished since 1983.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Turbine Engine Hot Section Technology, 1984; 11 p
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Specifying and calibrating instrumentations for wideband electronic power measurements (1980)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The wideband electric power measurement related topics of electronic wattmeter calibration and specification are discussed. Tested calibration techniques are described in detail. Analytical methods used to determine the bandwidth requirements of instrumentation for switching circuit waveforms are presented and illustrated with examples from electric vehicle type applications. Analog multiplier wattmeters, digital wattmeters and calculating digital oscilloscopes are compared. The instrumentation characteristics which are critical to accurate wideband power measurement are described.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA-TM-81545 , DOE/NASA/1044-8
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Optimization of fringe-type laser anemometers for turbine engine component testing (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The fringe type laser anemometer is analyzed using the Cramer-Rao bound for the variance of the estimate of the Doppler frequency as a figure of merit. Mie scattering theory is used to calculate the Doppler signal wherein both the amplitude and phase of the scattered light are taken into account. The noise from wall scatter is calculated using the wall bidirectional reflectivity and the irradiance of the incident beams. A procedure is described to determine the optimum aperture mask for the probe volume located a given distance from a wall. The expected performance of counter type processors is also discussed in relation to the Cramer-Rao bound. Numerical examples are presented for a coaxial backscatter anemometer. Previously announced in STAR as N84-25019
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: AIAA PAPER 84-1459
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Optimization of fringe-type laser anemometers for turbine engine component testing (1984)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The fringe type laser anemometer is analyzed using the Cramer-Rao bound for the variance of the estimate of the Doppler frequency as a figure of merit. Mie scattering theory is used to calculate the Doppler signal wherein both the amplitude and phase of the scattered light are taken into account. The noise from wall scatter is calculated using the wall bidirectional reflectivity and the irradiance of the incident beams. A procedure is described to determine the optimum aperture mask for the probe volume located a given distance from a wall. The expected performance of counter type processors is also discussed in relation to the Cramer-Rao bound. Numerical examples are presented for a coaxial backscatter anemometer.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA-TM-83658 , E-2099 , NAS 1.15:83658 , AIAA PAPER 84-1459 , Joint Propulsion Conf.; Jun 11, 1984 - Jun 13, 1984; Cincinnati, OH; United States
    Format: application/pdf
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
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