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  • INSTRUMENTATION AND PHOTOGRAPHY  (4)
  • 1970-1974  (4)
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  • 1
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    Simultaneous Raman and laser velocimeter measurements (1974)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: The feasibility of performing Raman and laser velocimeter measurements simultaneously is demonstrated, and it is shown that the background radiation associated with the Mie scattering and large particulate concentrations does not saturate or distort the relatively weak rotational Raman signals. Under stringent conditions of low static gas densities and large particulate concentrations, Raman density and temperature measurements agree to within plus or minus 5% of the calculated values.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: AIAA Journal; 12; Oct. 197
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Processing of the laser Doppler velocimeter signals (1973)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The laser Doppler velocimeter (LDV) is a probeless technique that provides a remote measurement of mean and fluctuating velocities. The measurement is actually obtained from small particles embedded in the flow which scatter light from an illuminating laser beam interference pattern. A portion of this scattered light is collected by a photomultiplier which yields an electronic signal whose frequency is directly proportional to the velocity of the small particles. The purpose of this paper is to describe and critically compare three techniques most used to process this electronic signal. These techniques are: (1) spectrum analyzer - a frequency scanning filter (frequency domain instrument), (2) wide-band frequency tracker - a frequency lock loop (frequency domain instrument), and (3) high-speed frequency counter - an interval timer (time domain instrument). The study determines the ability of each technique to process the LDV signal and yield velocity data to be used in determining the flow characteristics.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: ICIASF ''73; International Congress on Instrumentation in Aerospace Simulation Facilities; Sep 10, 1973 - Sep 12, 1973; Pasadena, CA
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Computer simulation of a fringe type laser velocimeter (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A computer simulation of a fringe type laser velocimeter has been written to determine the theoretical characteristics of the laser velocimeter when applied to a given flow field. The program includes the effect of particle size and composition on particle lag, light scattering characteristics and signal contrast. The model of the laser velocimeter includes the laser, optical system, photomultiplier, and counter type data processing electronics. The LV particle size analyzer is also modeled and incorporated in the program. An example application of the program to a Mach 5 wind tunnel using a backscatter laser velocimeter is presented.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: International Workshop on Laser Velocimetry; Mar 27, 1974 - Mar 29, 1974; West Lafayette, IN
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    A feasibility test of the laser velocimeter in the Mach 5 nozzle test chamber (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A one-component, fringe type laser velocimeter in the backscatter mode was used to measure flow velocities from 732 to 792 m/sec about a shock from an inclined flat plate in a Mach 5 tunnel. This test was chosen to determine system characteristics in applying the laser velocimeter to measure velocities in hypersonic flow fields. The seeding particles, less than 20 microns in diameter, were injected into the tunnel supply pipe, approximately 1 meter upstream of the nozzle throat, through a rake along the diameter. The LV signals were processed by two methods, a scanning spectrum analyzer and a high-speed counter. The measured velocity distributions obtained were analyzed to determine the errors due to particle lag, transit time broadening and high-speed counter quantizing error.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: International Workshop on Laser Velocimetry; Mar 27, 1974 - Mar 29, 1974; West Lafayette, IN
    Format: text
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    NASA TECHNICAL REPORTS
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