Showing papers on "Disdrometer published in 1972"

Distribution of Graupel and Hail With Size

Abstract: Observations have been made on the size and concentration of graupel and hail occurring in untreated convective cloud systems over the High Plains of the United States. From these data, an average graupel and hail distribution has been generated. The comparison of this .,ize spectrum with data from other studies, along with the implications to hail detection and hail suppression, is also discussed.

An Electrostatic Cloud Droplet Probe

Abstract: An electrostatic cloud droplet sizing device (electrostatic disdrometer) originally developed by Keily and Millen has been tested, modified extensively, and calibrated in our laboratory. The investigations have shown that soon after entry into the probe orifice, the incoming droplet is broken into many fragments. These impact and splash on an electrode raised to a 510 V potential. Measured pulses for a given droplet size give a reproducible calibration curve. Airborne tests of the probe have shown it to operate reliably with minimal maintenance. Comparisons were made between values of the liquid water content measured by the electrostatic disdrometer and by the Johnson-Williams hot-wire, liquid-water-content meter and between the droplet size distributions measured by the disdrometer and by impaction slide replicas. The comparisons were satisfactory within the limits of instrument measuring and sampling errors and actual variations in the droplets spectra resulting from the separation of the inst...