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  • INSTRUMENTATION AND PHOTOGRAPHY
  • Physics
  • 1965-1969
  • 1950-1954  (4)
  • 1951  (4)
  • 1
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    A simplified instrument for recording and indicating frequency and intensity of icing conditions encountered in flight (1951)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NACA-RM-E51E16
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    An Instrument Employing a Coronal Discharge for the Determination of Droplet-Size Distribution in Clouds (1951)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A flight instrument that uses electric means for measuring the droplet-size distribution in above-freezing clouds has been devised and given preliminary evaluation in flight. An electric charge is placed on the droplets and they are separated aerodynamically according to their mass. Because the charge placed on the droplets is a. function of the droplet size, the size spectrum can 'be determined by measurement of the charge deposited on cylinders of several different sizes placed to intercept the charged droplets. An expression for the rate of charge acquisition by a water droplet in a field of coronal discharge is derived. The results obtained in flight with an instrument based on the method described indicate that continuous records of droplet-size spectrum variations in clouds can be obtained. The experimental instrument was used to evaluate the method and was not refined to the extent necessary for obtaining conclusive meteorological data. The desirable features of an instrument based on the method described are (i) The instrument can be used in clouds with temperatures above freezing; (2) the size and the shape of the cylinders do not change during the exposure time; (3) the readings are instantaneous and continuous; (4) the available sensitivity permits the study of variations in cloud structures of less than 200 feet in extent.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NACA-TN-2458
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Adaptation of a Cascade Impactor to Flight Measurement of Droplet Size in Clouds (1951)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A cascade impactor, an instrument for obtaining: the size distribution of droplets borne in a low-velocity air stream, was adapted for flight cloud droplet-size studies. The air containing the droplets was slowed down from flight speed by a diffuser to the inlet-air velocity of the impactor. The droplets that enter the impactor impinge on four slides coated with magnesium oxide. Each slide catches a different size range. The relation between the size of droplet impressions and the droplet size was evaluated so that the droplet-size distributions may be found from these slides. The magnesium oxide coating provides a permanent record. of the droplet impression that is not affected by droplet evaporation after the. droplets have impinged.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NACA-RM-E51G05
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Flight Instrument for Measurement of Liquid-Water Content in Clouds at Temperatures Above and Below Freezing (1951)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A principle formerly used in an instrument for cloud detection was further investigated to provide a simple and rapid means for measuring the liquid-water content of clouds at temperatures above and below freezing. The instrument consists of a small cylindrical element so operated at high surface temperatures that the impingement of cloud droplets creates a significant drop in the surface temperature. ? The instrument is sensitive to a wide range of liquid-water content and was calibrated at one set of fixed conditions against rotating multicylinder measurements. The limited conditions of the calibration Included an air temperature of 20 F, an air velocity of 175 miles per hour, and a surface temperature in clear air of 475 F. The results obtained from experiments conducted with the instrument indicate that the principle can be used for measurements in clouds at temperatures above and below freezing. Calibrations for ranges of airspeed, air temperature, and air density will be necessary to adapt the Instrument for general flight use.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NACA-RM-E50J12A
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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